* [PATCH RFC v3 15/18] kasan: do not open-code addr_has_shadow
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
From: Daniel Axtens <dja@axtens.net>
We have a couple of places checking for the existence of a shadow
mapping for an address by open-coding the inverse of the check in
addr_has_shadow.
Replace the open-coded versions with the helper. This will be
needed in future to allow architectures to override the layout
of the shadow mapping.
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
mm/kasan/generic.c | 3 +--
mm/kasan/tags.c | 3 +--
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 504c79363a34..9e5c989dab8c 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -173,8 +173,7 @@ static __always_inline void check_memory_region_inline(unsigned long addr,
if (unlikely(size == 0))
return;
- if (unlikely((void *)addr <
- kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
+ if (unlikely(!addr_has_shadow((void *)addr))) {
kasan_report(addr, size, write, ret_ip);
return;
}
diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
index 63fca3172659..87ebee0a6aea 100644
--- a/mm/kasan/tags.c
+++ b/mm/kasan/tags.c
@@ -109,8 +109,7 @@ void check_memory_region(unsigned long addr, size_t size, bool write,
return;
untagged_addr = reset_tag((const void *)addr);
- if (unlikely(untagged_addr <
- kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
+ if (unlikely(!addr_has_shadow(untagged_addr))) {
kasan_report(addr, size, write, ret_ip);
return;
}
--
2.13.3
^ permalink raw reply related
* [PATCH v10 14/18] powerpc/32s: map kasan zero shadow with PAGE_READONLY instead of PAGE_KERNEL_RO
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
For hash32, the zero shadow page gets mapped with PAGE_READONLY instead
of PAGE_KERNEL_RO, because the PP bits don't provide a RO kernel, so
PAGE_KERNEL_RO is equivalent to PAGE_KERNEL. By using PAGE_READONLY,
the page is RO for both kernel and user, but this is not a security issue
as it contains only zeroes.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/mm/kasan/kasan_init_32.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
index ba8361487075..0d62be3cba47 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -39,7 +39,10 @@ static int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_
if (!new)
return -ENOMEM;
- kasan_populate_pte(new, PAGE_KERNEL_RO);
+ if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
+ kasan_populate_pte(new, PAGE_READONLY);
+ else
+ kasan_populate_pte(new, PAGE_KERNEL_RO);
pmd_populate_kernel(&init_mm, pmd, new);
}
return 0;
@@ -84,7 +87,10 @@ static int __ref kasan_init_region(void *start, size_t size)
static void __init kasan_remap_early_shadow_ro(void)
{
- kasan_populate_pte(kasan_early_shadow_pte, PAGE_KERNEL_RO);
+ if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
+ kasan_populate_pte(kasan_early_shadow_pte, PAGE_READONLY);
+ else
+ kasan_populate_pte(kasan_early_shadow_pte, PAGE_KERNEL_RO);
flush_tlb_kernel_range(KASAN_SHADOW_START, KASAN_SHADOW_END);
}
--
2.13.3
^ permalink raw reply related
* [PATCH v10 13/18] powerpc/32s: set up an early static hash table for KASAN.
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
KASAN requires early activation of hash table, before memblock()
functions are available.
This patch implements an early hash_table statically defined in
__initdata.
During early boot, a single page table is used.
For hash32, when doing the final init, one page table is allocated
for each PGD entry because of the _PAGE_HASHPTE flag which can't be
common to several virt pages. This is done after memblock get
available but before switching to the final hash table, otherwise
there are issues with TLB flushing due to the shared entries.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_32.S | 40 ++++++++++++++++++++++++++---------
arch/powerpc/mm/kasan/kasan_init_32.c | 23 +++++++++++++++++++-
arch/powerpc/mm/mmu_decl.h | 1 +
3 files changed, 53 insertions(+), 11 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 0bfaf64e67ee..fd7c394bc77c 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -160,6 +160,10 @@ __after_mmu_off:
bl flush_tlbs
bl initial_bats
+ bl load_segment_registers
+#ifdef CONFIG_KASAN
+ bl early_hash_table
+#endif
#if defined(CONFIG_BOOTX_TEXT)
bl setup_disp_bat
#endif
@@ -205,7 +209,7 @@ __after_mmu_off:
*/
turn_on_mmu:
mfmsr r0
- ori r0,r0,MSR_DR|MSR_IR
+ ori r0,r0,MSR_DR|MSR_IR|MSR_RI
mtspr SPRN_SRR1,r0
lis r0,start_here@h
ori r0,r0,start_here@l
@@ -884,11 +888,24 @@ _ENTRY(__restore_cpu_setup)
blr
#endif /* !defined(CONFIG_PPC_BOOK3S_32) */
-
/*
* Load stuff into the MMU. Intended to be called with
* IR=0 and DR=0.
*/
+#ifdef CONFIG_KASAN
+early_hash_table:
+ sync /* Force all PTE updates to finish */
+ isync
+ tlbia /* Clear all TLB entries */
+ sync /* wait for tlbia/tlbie to finish */
+ TLBSYNC /* ... on all CPUs */
+ /* Load the SDR1 register (hash table base & size) */
+ lis r6, early_hash - PAGE_OFFSET@h
+ ori r6, r6, 3 /* 256kB table */
+ mtspr SPRN_SDR1, r6
+ blr
+#endif
+
load_up_mmu:
sync /* Force all PTE updates to finish */
isync
@@ -900,14 +917,6 @@ load_up_mmu:
tophys(r6,r6)
lwz r6,_SDR1@l(r6)
mtspr SPRN_SDR1,r6
- li r0,16 /* load up segment register values */
- mtctr r0 /* for context 0 */
- lis r3,0x2000 /* Ku = 1, VSID = 0 */
- li r4,0
-3: mtsrin r3,r4
- addi r3,r3,0x111 /* increment VSID */
- addis r4,r4,0x1000 /* address of next segment */
- bdnz 3b
/* Load the BAT registers with the values set up by MMU_init.
MMU_init takes care of whether we're on a 601 or not. */
@@ -929,6 +938,17 @@ BEGIN_MMU_FTR_SECTION
END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
blr
+load_segment_registers:
+ li r0, 16 /* load up segment register values */
+ mtctr r0 /* for context 0 */
+ lis r3, 0x2000 /* Ku = 1, VSID = 0 */
+ li r4, 0
+3: mtsrin r3, r4
+ addi r3, r3, 0x111 /* increment VSID */
+ addis r4, r4, 0x1000 /* address of next segment */
+ bdnz 3b
+ blr
+
/*
* This is where the main kernel code starts.
*/
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
index 42617fcad828..ba8361487075 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -94,6 +94,13 @@ void __init kasan_mmu_init(void)
int ret;
struct memblock_region *reg;
+ if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE)) {
+ ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END);
+
+ if (ret)
+ panic("kasan: kasan_init_shadow_page_tables() failed");
+ }
+
for_each_memblock(memory, reg) {
phys_addr_t base = reg->base;
phys_addr_t top = min(base + reg->size, total_lowmem);
@@ -135,6 +142,20 @@ void *module_alloc(unsigned long size)
}
#endif
+#ifdef CONFIG_PPC_BOOK3S_32
+u8 __initdata early_hash[256 << 10] __aligned(256 << 10) = {0};
+
+static void __init kasan_early_hash_table(void)
+{
+ modify_instruction_site(&patch__hash_page_A0, 0xffff, __pa(early_hash) >> 16);
+ modify_instruction_site(&patch__flush_hash_A0, 0xffff, __pa(early_hash) >> 16);
+
+ Hash = (struct hash_pte *)early_hash;
+}
+#else
+static void __init kasan_early_hash_table(void) {}
+#endif
+
void __init kasan_early_init(void)
{
unsigned long addr = KASAN_SHADOW_START;
@@ -152,5 +173,5 @@ void __init kasan_early_init(void)
} while (pmd++, addr = next, addr != end);
if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
- WARN(true, "KASAN not supported on hash 6xx");
+ kasan_early_hash_table();
}
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index d726ff776054..31fce3914ddc 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -106,6 +106,7 @@ extern unsigned int rtas_data, rtas_size;
struct hash_pte;
extern struct hash_pte *Hash, *Hash_end;
extern unsigned long Hash_size, Hash_mask;
+extern u8 early_hash[];
#endif /* CONFIG_PPC32 */
--
2.13.3
^ permalink raw reply related
* [PATCH v10 12/18] powerpc/32s: move hash code patching out of MMU_init_hw()
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
For KASAN, hash table handling will be activated early for
accessing to KASAN shadow areas.
In order to avoid any modification of the hash functions while
they are still used with the early hash table, the code patching
is moved out of MMU_init_hw() and put close to the big-bang switch
to the final hash table.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_32.S | 3 +++
arch/powerpc/mm/mmu_decl.h | 1 +
arch/powerpc/mm/ppc_mmu_32.c | 36 ++++++++++++++++++++++--------------
3 files changed, 26 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 3ee42c0ada69..0bfaf64e67ee 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -966,6 +966,9 @@ start_here:
bl machine_init
bl __save_cpu_setup
bl MMU_init
+BEGIN_MMU_FTR_SECTION
+ bl MMU_init_hw_patch
+END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
/*
* Go back to running unmapped so we can load up new values
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 74ff61dabcb1..d726ff776054 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -130,6 +130,7 @@ extern void wii_memory_fixups(void);
*/
#ifdef CONFIG_PPC32
extern void MMU_init_hw(void);
+void MMU_init_hw_patch(void);
unsigned long mmu_mapin_ram(unsigned long base, unsigned long top);
#endif
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 2d5b0d50fb31..38c0e28c21e1 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -39,6 +39,7 @@
struct hash_pte *Hash, *Hash_end;
unsigned long Hash_size, Hash_mask;
unsigned long _SDR1;
+static unsigned int hash_mb, hash_mb2;
struct ppc_bat BATS[8][2]; /* 8 pairs of IBAT, DBAT */
@@ -308,7 +309,6 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
*/
void __init MMU_init_hw(void)
{
- unsigned int hmask, mb, mb2;
unsigned int n_hpteg, lg_n_hpteg;
if (!mmu_has_feature(MMU_FTR_HPTE_TABLE))
@@ -349,20 +349,30 @@ void __init MMU_init_hw(void)
(unsigned long long)(total_memory >> 20), Hash_size >> 10, Hash);
- /*
- * Patch up the instructions in hashtable.S:create_hpte
- */
- if ( ppc_md.progress ) ppc_md.progress("hash:patch", 0x345);
Hash_mask = n_hpteg - 1;
- hmask = Hash_mask >> (16 - LG_HPTEG_SIZE);
- mb2 = mb = 32 - LG_HPTEG_SIZE - lg_n_hpteg;
+ hash_mb2 = hash_mb = 32 - LG_HPTEG_SIZE - lg_n_hpteg;
if (lg_n_hpteg > 16)
- mb2 = 16 - LG_HPTEG_SIZE;
+ hash_mb2 = 16 - LG_HPTEG_SIZE;
+}
+
+void __init MMU_init_hw_patch(void)
+{
+ unsigned int hmask = Hash_mask >> (16 - LG_HPTEG_SIZE);
+ if (ppc_md.progress)
+ ppc_md.progress("hash:patch", 0x345);
+ if (ppc_md.progress)
+ ppc_md.progress("hash:done", 0x205);
+
+ /* WARNING: Make sure nothing can trigger a KASAN check past this point */
+
+ /*
+ * Patch up the instructions in hashtable.S:create_hpte
+ */
modify_instruction_site(&patch__hash_page_A0, 0xffff,
((unsigned int)Hash - PAGE_OFFSET) >> 16);
- modify_instruction_site(&patch__hash_page_A1, 0x7c0, mb << 6);
- modify_instruction_site(&patch__hash_page_A2, 0x7c0, mb2 << 6);
+ modify_instruction_site(&patch__hash_page_A1, 0x7c0, hash_mb << 6);
+ modify_instruction_site(&patch__hash_page_A2, 0x7c0, hash_mb2 << 6);
modify_instruction_site(&patch__hash_page_B, 0xffff, hmask);
modify_instruction_site(&patch__hash_page_C, 0xffff, hmask);
@@ -371,11 +381,9 @@ void __init MMU_init_hw(void)
*/
modify_instruction_site(&patch__flush_hash_A0, 0xffff,
((unsigned int)Hash - PAGE_OFFSET) >> 16);
- modify_instruction_site(&patch__flush_hash_A1, 0x7c0, mb << 6);
- modify_instruction_site(&patch__flush_hash_A2, 0x7c0, mb2 << 6);
+ modify_instruction_site(&patch__flush_hash_A1, 0x7c0, hash_mb << 6);
+ modify_instruction_site(&patch__flush_hash_A2, 0x7c0, hash_mb2 << 6);
modify_instruction_site(&patch__flush_hash_B, 0xffff, hmask);
-
- if ( ppc_md.progress ) ppc_md.progress("hash:done", 0x205);
}
void setup_initial_memory_limit(phys_addr_t first_memblock_base,
--
2.13.3
^ permalink raw reply related
* [PATCH v10 11/18] powerpc/32: Add KASAN support
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
This patch adds KASAN support for PPC32. The following patch
will add an early activation of hash table for book3s. Until
then, a warning will be raised if trying to use KASAN on an
hash 6xx.
To support KASAN, this patch initialises that MMU mapings for
accessing to the KASAN shadow area defined in a previous patch.
An early mapping is set as soon as the kernel code has been
relocated at its definitive place.
Then the definitive mapping is set once paging is initialised.
For modules, the shadow area is allocated at module_alloc().
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/kasan.h | 9 ++
arch/powerpc/kernel/head_32.S | 3 +
arch/powerpc/kernel/head_40x.S | 3 +
arch/powerpc/kernel/head_44x.S | 3 +
arch/powerpc/kernel/head_8xx.S | 3 +
arch/powerpc/kernel/head_fsl_booke.S | 3 +
arch/powerpc/kernel/setup-common.c | 3 +
arch/powerpc/mm/Makefile | 1 +
arch/powerpc/mm/init_32.c | 3 +
arch/powerpc/mm/kasan/Makefile | 5 ++
arch/powerpc/mm/kasan/kasan_init_32.c | 156 ++++++++++++++++++++++++++++++++++
12 files changed, 193 insertions(+)
create mode 100644 arch/powerpc/mm/kasan/Makefile
create mode 100644 arch/powerpc/mm/kasan/kasan_init_32.c
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index facaa6ba0d2a..d9364368329b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -173,6 +173,7 @@ config PPC
select GENERIC_TIME_VSYSCALL
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_JUMP_LABEL
+ select HAVE_ARCH_KASAN if PPC32
select HAVE_ARCH_KGDB
select HAVE_ARCH_MMAP_RND_BITS
select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
diff --git a/arch/powerpc/include/asm/kasan.h b/arch/powerpc/include/asm/kasan.h
index 05274dea3109..296e51c2f066 100644
--- a/arch/powerpc/include/asm/kasan.h
+++ b/arch/powerpc/include/asm/kasan.h
@@ -27,5 +27,14 @@
#define KASAN_SHADOW_SIZE (KASAN_SHADOW_END - KASAN_SHADOW_START)
+#ifdef CONFIG_KASAN
+void kasan_early_init(void);
+void kasan_mmu_init(void);
+void kasan_init(void);
+#else
+static inline void kasan_init(void) { }
+static inline void kasan_mmu_init(void) { }
+#endif
+
#endif /* __ASSEMBLY */
#endif
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 48051c8977c5..3ee42c0ada69 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -958,6 +958,9 @@ start_here:
* Do early platform-specific initialization,
* and set up the MMU.
*/
+#ifdef CONFIG_KASAN
+ bl kasan_early_init
+#endif
li r3,0
mr r4,r31
bl machine_init
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index a9c934f2319b..efa219d2136e 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -848,6 +848,9 @@ start_here:
/*
* Decide what sort of machine this is and initialize the MMU.
*/
+#ifdef CONFIG_KASAN
+ bl kasan_early_init
+#endif
li r3,0
mr r4,r31
bl machine_init
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 37117ab11584..34a5df827b38 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -203,6 +203,9 @@ _ENTRY(_start);
/*
* Decide what sort of machine this is and initialize the MMU.
*/
+#ifdef CONFIG_KASAN
+ bl kasan_early_init
+#endif
li r3,0
mr r4,r31
bl machine_init
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 03c73b4c6435..d25adb6ef235 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -853,6 +853,9 @@ start_here:
/*
* Decide what sort of machine this is and initialize the MMU.
*/
+#ifdef CONFIG_KASAN
+ bl kasan_early_init
+#endif
li r3,0
mr r4,r31
bl machine_init
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 1881127682e9..0fc38eb957b7 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -275,6 +275,9 @@ set_ivor:
/*
* Decide what sort of machine this is and initialize the MMU.
*/
+#ifdef CONFIG_KASAN
+ bl kasan_early_init
+#endif
mr r3,r30
mr r4,r31
bl machine_init
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index e7534f306c8e..3c6c5a43901e 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -67,6 +67,7 @@
#include <asm/livepatch.h>
#include <asm/mmu_context.h>
#include <asm/cpu_has_feature.h>
+#include <asm/kasan.h>
#include "setup.h"
@@ -865,6 +866,8 @@ static void smp_setup_pacas(void)
*/
void __init setup_arch(char **cmdline_p)
{
+ kasan_init();
+
*cmdline_p = boot_command_line;
/* Set a half-reasonable default so udelay does something sensible */
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index 240d73dce6bb..80382a2d169b 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_PPC_COPRO_BASE) += copro_fault.o
obj-$(CONFIG_SPAPR_TCE_IOMMU) += mmu_context_iommu.o
obj-$(CONFIG_PPC_PTDUMP) += ptdump/
obj-$(CONFIG_PPC_MEM_KEYS) += pkeys.o
+obj-$(CONFIG_KASAN) += kasan/
# Disable kcov instrumentation on sensitive code
# This is necessary for booting with kcov enabled on book3e machines
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 41a3513cadc9..0217d1b405f7 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -45,6 +45,7 @@
#include <asm/tlb.h>
#include <asm/sections.h>
#include <asm/hugetlb.h>
+#include <asm/kasan.h>
#include "mmu_decl.h"
@@ -178,6 +179,8 @@ void __init MMU_init(void)
btext_unmap();
#endif
+ kasan_mmu_init();
+
/* Shortly after that, the entire linear mapping will be available */
memblock_set_current_limit(lowmem_end_addr);
}
diff --git a/arch/powerpc/mm/kasan/Makefile b/arch/powerpc/mm/kasan/Makefile
new file mode 100644
index 000000000000..6577897673dd
--- /dev/null
+++ b/arch/powerpc/mm/kasan/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+KASAN_SANITIZE := n
+
+obj-$(CONFIG_PPC32) += kasan_init_32.o
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
new file mode 100644
index 000000000000..42617fcad828
--- /dev/null
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define DISABLE_BRANCH_PROFILING
+
+#include <linux/kasan.h>
+#include <linux/printk.h>
+#include <linux/memblock.h>
+#include <linux/sched/task.h>
+#include <linux/vmalloc.h>
+#include <asm/pgalloc.h>
+#include <asm/code-patching.h>
+#include <mm/mmu_decl.h>
+
+static void kasan_populate_pte(pte_t *ptep, pgprot_t prot)
+{
+ unsigned long va = (unsigned long)kasan_early_shadow_page;
+ phys_addr_t pa = __pa(kasan_early_shadow_page);
+ int i;
+
+ for (i = 0; i < PTRS_PER_PTE; i++, ptep++)
+ __set_pte_at(&init_mm, va, ptep, pfn_pte(PHYS_PFN(pa), prot), 0);
+}
+
+static int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end)
+{
+ pmd_t *pmd;
+ unsigned long k_cur, k_next;
+
+ pmd = pmd_offset(pud_offset(pgd_offset_k(k_start), k_start), k_start);
+
+ for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) {
+ pte_t *new;
+
+ k_next = pgd_addr_end(k_cur, k_end);
+ if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
+ continue;
+
+ new = pte_alloc_one_kernel(&init_mm);
+
+ if (!new)
+ return -ENOMEM;
+ kasan_populate_pte(new, PAGE_KERNEL_RO);
+ pmd_populate_kernel(&init_mm, pmd, new);
+ }
+ return 0;
+}
+
+static void __ref *kasan_get_one_page(void)
+{
+ if (slab_is_available())
+ return (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
+
+ return memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+}
+
+static int __ref kasan_init_region(void *start, size_t size)
+{
+ unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
+ unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
+ unsigned long k_cur;
+ int ret;
+ void *block = NULL;
+
+ ret = kasan_init_shadow_page_tables(k_start, k_end);
+ if (ret)
+ return ret;
+
+ if (!slab_is_available())
+ block = memblock_alloc(k_end - k_start, PAGE_SIZE);
+
+ for (k_cur = k_start; k_cur < k_end; k_cur += PAGE_SIZE) {
+ pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur);
+ void *va = block ? block + k_cur - k_start : kasan_get_one_page();
+ pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
+
+ if (!va)
+ return -ENOMEM;
+
+ __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
+ }
+ flush_tlb_kernel_range(k_start, k_end);
+ return 0;
+}
+
+static void __init kasan_remap_early_shadow_ro(void)
+{
+ kasan_populate_pte(kasan_early_shadow_pte, PAGE_KERNEL_RO);
+
+ flush_tlb_kernel_range(KASAN_SHADOW_START, KASAN_SHADOW_END);
+}
+
+void __init kasan_mmu_init(void)
+{
+ int ret;
+ struct memblock_region *reg;
+
+ for_each_memblock(memory, reg) {
+ phys_addr_t base = reg->base;
+ phys_addr_t top = min(base + reg->size, total_lowmem);
+
+ if (base >= top)
+ continue;
+
+ ret = kasan_init_region(__va(base), top - base);
+ if (ret)
+ panic("kasan: kasan_init_region() failed");
+ }
+}
+
+void __init kasan_init(void)
+{
+ kasan_remap_early_shadow_ro();
+
+ clear_page(kasan_early_shadow_page);
+
+ /* At this point kasan is fully initialized. Enable error messages */
+ init_task.kasan_depth = 0;
+ pr_info("KASAN init done\n");
+}
+
+#ifdef CONFIG_MODULES
+void *module_alloc(unsigned long size)
+{
+ void *base = vmalloc_exec(size);
+
+ if (!base)
+ return NULL;
+
+ if (!kasan_init_region(base, size))
+ return base;
+
+ vfree(base);
+
+ return NULL;
+}
+#endif
+
+void __init kasan_early_init(void)
+{
+ unsigned long addr = KASAN_SHADOW_START;
+ unsigned long end = KASAN_SHADOW_END;
+ unsigned long next;
+ pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(addr), addr), addr);
+
+ BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK);
+
+ kasan_populate_pte(kasan_early_shadow_pte, PAGE_KERNEL);
+
+ do {
+ next = pgd_addr_end(addr, end);
+ pmd_populate_kernel(&init_mm, pmd, kasan_early_shadow_pte);
+ } while (pmd++, addr = next, addr != end);
+
+ if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
+ WARN(true, "KASAN not supported on hash 6xx");
+}
--
2.13.3
^ permalink raw reply related
* [PATCH v10 10/18] powerpc: disable KASAN instrumentation on early/critical files.
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
All files containing functions run before kasan_early_init() is called
must have KASAN instrumentation disabled.
For those file, branch profiling also have to be disabled otherwise
each if () generates a call to ftrace_likely_update().
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/Makefile | 12 ++++++++++++
arch/powerpc/lib/Makefile | 8 ++++++++
arch/powerpc/mm/Makefile | 6 ++++++
arch/powerpc/platforms/powermac/Makefile | 6 ++++++
arch/powerpc/purgatory/Makefile | 3 +++
arch/powerpc/xmon/Makefile | 1 +
6 files changed, 36 insertions(+)
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 45e47752b692..0ea6c4aa3a20 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -31,6 +31,18 @@ CFLAGS_REMOVE_btext.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_prom.o = $(CC_FLAGS_FTRACE)
endif
+KASAN_SANITIZE_early_32.o := n
+KASAN_SANITIZE_cputable.o := n
+KASAN_SANITIZE_prom_init.o := n
+KASAN_SANITIZE_btext.o := n
+
+ifdef CONFIG_KASAN
+CFLAGS_early_32.o += -DDISABLE_BRANCH_PROFILING
+CFLAGS_cputable.o += -DDISABLE_BRANCH_PROFILING
+CFLAGS_prom_init.o += -DDISABLE_BRANCH_PROFILING
+CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING
+endif
+
obj-y := cputable.o ptrace.o syscalls.o \
irq.o align.o signal_32.o pmc.o vdso.o \
process.o systbl.o idle.o \
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 47a4de434c22..c55f9c27bf79 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -8,6 +8,14 @@ ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
CFLAGS_REMOVE_code-patching.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_feature-fixups.o = $(CC_FLAGS_FTRACE)
+KASAN_SANITIZE_code-patching.o := n
+KASAN_SANITIZE_feature-fixups.o := n
+
+ifdef CONFIG_KASAN
+CFLAGS_code-patching.o += -DDISABLE_BRANCH_PROFILING
+CFLAGS_feature-fixups.o += -DDISABLE_BRANCH_PROFILING
+endif
+
obj-y += alloc.o code-patching.o feature-fixups.o
ifndef CONFIG_KASAN
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index d52ec118e09d..240d73dce6bb 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -7,6 +7,12 @@ ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
CFLAGS_REMOVE_slb.o = $(CC_FLAGS_FTRACE)
+KASAN_SANITIZE_ppc_mmu_32.o := n
+
+ifdef CONFIG_KASAN
+CFLAGS_ppc_mmu_32.o += -DDISABLE_BRANCH_PROFILING
+endif
+
obj-y := fault.o mem.o pgtable.o mmap.o \
init_$(BITS).o pgtable_$(BITS).o \
init-common.o mmu_context.o drmem.o
diff --git a/arch/powerpc/platforms/powermac/Makefile b/arch/powerpc/platforms/powermac/Makefile
index 20ebf35d7913..f4247ade71ca 100644
--- a/arch/powerpc/platforms/powermac/Makefile
+++ b/arch/powerpc/platforms/powermac/Makefile
@@ -2,6 +2,12 @@
CFLAGS_bootx_init.o += -fPIC
CFLAGS_bootx_init.o += $(call cc-option, -fno-stack-protector)
+KASAN_SANITIZE_bootx_init.o := n
+
+ifdef CONFIG_KASAN
+CFLAGS_bootx_init.o += -DDISABLE_BRANCH_PROFILING
+endif
+
ifdef CONFIG_FUNCTION_TRACER
# Do not trace early boot code
CFLAGS_REMOVE_bootx_init.o = $(CC_FLAGS_FTRACE)
diff --git a/arch/powerpc/purgatory/Makefile b/arch/powerpc/purgatory/Makefile
index 4314ba5baf43..7c6d8b14f440 100644
--- a/arch/powerpc/purgatory/Makefile
+++ b/arch/powerpc/purgatory/Makefile
@@ -1,4 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
+
+KASAN_SANITIZE := n
+
targets += trampoline.o purgatory.ro kexec-purgatory.c
LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined
diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
index 3050f9323254..f142570ad860 100644
--- a/arch/powerpc/xmon/Makefile
+++ b/arch/powerpc/xmon/Makefile
@@ -7,6 +7,7 @@ subdir-ccflags-y := $(call cc-disable-warning, builtin-requires-header)
GCOV_PROFILE := n
KCOV_INSTRUMENT := n
UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
# Disable ftrace for the entire directory
ORIG_CFLAGS := $(KBUILD_CFLAGS)
--
2.13.3
^ permalink raw reply related
* [PATCH v10 08/18] powerpc/32: make KVIRT_TOP dependent on FIXMAP_START
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
When we add KASAN shadow area, KVIRT_TOP can't be anymore fixed
at 0xfe000000.
This patch uses FIXADDR_START to define KVIRT_TOP.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/book3s/32/pgtable.h | 13 ++++++++++---
arch/powerpc/include/asm/nohash/32/pgtable.h | 13 ++++++++++---
2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index aa8406b8f7ba..838de59f6754 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -134,15 +134,24 @@ static inline bool pte_user(pte_t pte)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
+
+#ifndef __ASSEMBLY__
+
+int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
+
+#endif /* !__ASSEMBLY__ */
+
/*
* This is the bottom of the PKMAP area with HIGHMEM or an arbitrary
* value (for now) on others, from where we can start layout kernel
* virtual space that goes below PKMAP and FIXMAP
*/
+#include <asm/fixmap.h>
+
#ifdef CONFIG_HIGHMEM
#define KVIRT_TOP PKMAP_BASE
#else
-#define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */
+#define KVIRT_TOP FIXADDR_START
#endif
/*
@@ -373,8 +382,6 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
-int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
-
/* Generic accessors to PTE bits */
static inline int pte_write(pte_t pte) { return !!(pte_val(pte) & _PAGE_RW);}
static inline int pte_read(pte_t pte) { return 1; }
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index bed433358260..0284f8f5305f 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -64,15 +64,24 @@ extern int icache_44x_need_flush;
#define pgd_ERROR(e) \
pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+#ifndef __ASSEMBLY__
+
+int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
+
+#endif /* !__ASSEMBLY__ */
+
+
/*
* This is the bottom of the PKMAP area with HIGHMEM or an arbitrary
* value (for now) on others, from where we can start layout kernel
* virtual space that goes below PKMAP and FIXMAP
*/
+#include <asm/fixmap.h>
+
#ifdef CONFIG_HIGHMEM
#define KVIRT_TOP PKMAP_BASE
#else
-#define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */
+#define KVIRT_TOP FIXADDR_START
#endif
/*
@@ -379,8 +388,6 @@ static inline int pte_young(pte_t pte)
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
-int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
-
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */
--
2.13.3
^ permalink raw reply related
* [PATCH v10 09/18] powerpc/32: prepare shadow area for KASAN
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
This patch prepares a shadow area for KASAN.
The shadow area will be at the top of the kernel virtual
memory space above the fixmap area and will occupy one
eighth of the total kernel virtual memory space.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/Kconfig.debug | 5 +++++
arch/powerpc/include/asm/fixmap.h | 5 +++++
arch/powerpc/include/asm/kasan.h | 16 ++++++++++++++++
arch/powerpc/mm/mem.c | 4 ++++
arch/powerpc/mm/ptdump/ptdump.c | 8 ++++++++
5 files changed, 38 insertions(+)
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 4e00cb0a5464..61febbbdd02b 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -366,3 +366,8 @@ config PPC_FAST_ENDIAN_SWITCH
depends on DEBUG_KERNEL && PPC_BOOK3S_64
help
If you're unsure what this is, say N.
+
+config KASAN_SHADOW_OFFSET
+ hex
+ depends on KASAN
+ default 0xe0000000
diff --git a/arch/powerpc/include/asm/fixmap.h b/arch/powerpc/include/asm/fixmap.h
index b9fbed84ddca..0cfc365d814b 100644
--- a/arch/powerpc/include/asm/fixmap.h
+++ b/arch/powerpc/include/asm/fixmap.h
@@ -22,7 +22,12 @@
#include <asm/kmap_types.h>
#endif
+#ifdef CONFIG_KASAN
+#include <asm/kasan.h>
+#define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE)
+#else
#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
+#endif
/*
* Here we define all the compile-time 'special' virtual
diff --git a/arch/powerpc/include/asm/kasan.h b/arch/powerpc/include/asm/kasan.h
index 2c179a39d4ba..05274dea3109 100644
--- a/arch/powerpc/include/asm/kasan.h
+++ b/arch/powerpc/include/asm/kasan.h
@@ -12,4 +12,20 @@
#define EXPORT_SYMBOL_KASAN(fn)
#endif
+#ifndef __ASSEMBLY__
+
+#include <asm/page.h>
+
+#define KASAN_SHADOW_SCALE_SHIFT 3
+
+#define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \
+ (PAGE_OFFSET >> KASAN_SHADOW_SCALE_SHIFT))
+
+#define KASAN_SHADOW_OFFSET ASM_CONST(CONFIG_KASAN_SHADOW_OFFSET)
+
+#define KASAN_SHADOW_END 0UL
+
+#define KASAN_SHADOW_SIZE (KASAN_SHADOW_END - KASAN_SHADOW_START)
+
+#endif /* __ASSEMBLY */
#endif
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index f6787f90e158..4e7fa4eb2dd3 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -309,6 +309,10 @@ void __init mem_init(void)
mem_init_print_info(NULL);
#ifdef CONFIG_PPC32
pr_info("Kernel virtual memory layout:\n");
+#ifdef CONFIG_KASAN
+ pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
+ KASAN_SHADOW_START, KASAN_SHADOW_END);
+#endif
pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
#ifdef CONFIG_HIGHMEM
pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index 37138428ab55..812ed680024f 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -101,6 +101,10 @@ static struct addr_marker address_markers[] = {
{ 0, "Fixmap start" },
{ 0, "Fixmap end" },
#endif
+#ifdef CONFIG_KASAN
+ { 0, "kasan shadow mem start" },
+ { 0, "kasan shadow mem end" },
+#endif
{ -1, NULL },
};
@@ -322,6 +326,10 @@ static void populate_markers(void)
#endif
address_markers[i++].start_address = FIXADDR_START;
address_markers[i++].start_address = FIXADDR_TOP;
+#ifdef CONFIG_KASAN
+ address_markers[i++].start_address = KASAN_SHADOW_START;
+ address_markers[i++].start_address = KASAN_SHADOW_END;
+#endif
#endif /* CONFIG_PPC64 */
}
--
2.13.3
^ permalink raw reply related
* [PATCH v10 05/18] powerpc/prom_init: don't use string functions from lib/
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
When KASAN is active, the string functions in lib/ are doing the
KASAN checks. This is too early for prom_init.
This patch implements dedicated string functions for prom_init,
which will be compiled in with KASAN disabled.
Size of prom_init before the patch:
text data bss dec hex filename
12060 488 6960 19508 4c34 arch/powerpc/kernel/prom_init.o
Size of prom_init after the patch:
text data bss dec hex filename
12460 488 6960 19908 4dc4 arch/powerpc/kernel/prom_init.o
This increases the size of prom_init a bit, but as prom_init is
in __init section, it is freed after boot anyway.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/prom_init.c | 211 ++++++++++++++++++++++++++-------
arch/powerpc/kernel/prom_init_check.sh | 2 +-
2 files changed, 171 insertions(+), 42 deletions(-)
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index ecf083c46bdb..7017156168e8 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -224,6 +224,135 @@ static bool __prombss rtas_has_query_cpu_stopped;
#define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
#define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
+/* Copied from lib/string.c and lib/kstrtox.c */
+
+static int __init prom_strcmp(const char *cs, const char *ct)
+{
+ unsigned char c1, c2;
+
+ while (1) {
+ c1 = *cs++;
+ c2 = *ct++;
+ if (c1 != c2)
+ return c1 < c2 ? -1 : 1;
+ if (!c1)
+ break;
+ }
+ return 0;
+}
+
+static char __init *prom_strcpy(char *dest, const char *src)
+{
+ char *tmp = dest;
+
+ while ((*dest++ = *src++) != '\0')
+ /* nothing */;
+ return tmp;
+}
+
+static int __init prom_strncmp(const char *cs, const char *ct, size_t count)
+{
+ unsigned char c1, c2;
+
+ while (count) {
+ c1 = *cs++;
+ c2 = *ct++;
+ if (c1 != c2)
+ return c1 < c2 ? -1 : 1;
+ if (!c1)
+ break;
+ count--;
+ }
+ return 0;
+}
+
+static size_t __init prom_strlen(const char *s)
+{
+ const char *sc;
+
+ for (sc = s; *sc != '\0'; ++sc)
+ /* nothing */;
+ return sc - s;
+}
+
+static int __init prom_memcmp(const void *cs, const void *ct, size_t count)
+{
+ const unsigned char *su1, *su2;
+ int res = 0;
+
+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
+ if ((res = *su1 - *su2) != 0)
+ break;
+ return res;
+}
+
+static char __init *prom_strstr(const char *s1, const char *s2)
+{
+ size_t l1, l2;
+
+ l2 = prom_strlen(s2);
+ if (!l2)
+ return (char *)s1;
+ l1 = prom_strlen(s1);
+ while (l1 >= l2) {
+ l1--;
+ if (!prom_memcmp(s1, s2, l2))
+ return (char *)s1;
+ s1++;
+ }
+ return NULL;
+}
+
+static size_t __init prom_strlcpy(char *dest, const char *src, size_t size)
+{
+ size_t ret = prom_strlen(src);
+
+ if (size) {
+ size_t len = (ret >= size) ? size - 1 : ret;
+ memcpy(dest, src, len);
+ dest[len] = '\0';
+ }
+ return ret;
+}
+
+#ifdef CONFIG_PPC_PSERIES
+static int __init prom_strtobool(const char *s, bool *res)
+{
+ if (!s)
+ return -EINVAL;
+
+ switch (s[0]) {
+ case 'y':
+ case 'Y':
+ case '1':
+ *res = true;
+ return 0;
+ case 'n':
+ case 'N':
+ case '0':
+ *res = false;
+ return 0;
+ case 'o':
+ case 'O':
+ switch (s[1]) {
+ case 'n':
+ case 'N':
+ *res = true;
+ return 0;
+ case 'f':
+ case 'F':
+ *res = false;
+ return 0;
+ default:
+ break;
+ }
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+#endif
/* This is the one and *ONLY* place where we actually call open
* firmware.
@@ -555,7 +684,7 @@ static int __init prom_setprop(phandle node, const char *nodename,
add_string(&p, tohex((u32)(unsigned long) value));
add_string(&p, tohex(valuelen));
add_string(&p, tohex(ADDR(pname)));
- add_string(&p, tohex(strlen(pname)));
+ add_string(&p, tohex(prom_strlen(pname)));
add_string(&p, "property");
*p = 0;
return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
@@ -638,23 +767,23 @@ static void __init early_cmdline_parse(void)
if ((long)prom.chosen > 0)
l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && (l <= 0 || p[0] == '\0')) /* dbl check */
- strlcpy(prom_cmd_line, CONFIG_CMDLINE, sizeof(prom_cmd_line));
+ prom_strlcpy(prom_cmd_line, CONFIG_CMDLINE, sizeof(prom_cmd_line));
prom_printf("command line: %s\n", prom_cmd_line);
#ifdef CONFIG_PPC64
- opt = strstr(prom_cmd_line, "iommu=");
+ opt = prom_strstr(prom_cmd_line, "iommu=");
if (opt) {
prom_printf("iommu opt is: %s\n", opt);
opt += 6;
while (*opt && *opt == ' ')
opt++;
- if (!strncmp(opt, "off", 3))
+ if (!prom_strncmp(opt, "off", 3))
prom_iommu_off = 1;
- else if (!strncmp(opt, "force", 5))
+ else if (!prom_strncmp(opt, "force", 5))
prom_iommu_force_on = 1;
}
#endif
- opt = strstr(prom_cmd_line, "mem=");
+ opt = prom_strstr(prom_cmd_line, "mem=");
if (opt) {
opt += 4;
prom_memory_limit = prom_memparse(opt, (const char **)&opt);
@@ -666,13 +795,13 @@ static void __init early_cmdline_parse(void)
#ifdef CONFIG_PPC_PSERIES
prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
- opt = strstr(prom_cmd_line, "disable_radix");
+ opt = prom_strstr(prom_cmd_line, "disable_radix");
if (opt) {
opt += 13;
if (*opt && *opt == '=') {
bool val;
- if (kstrtobool(++opt, &val))
+ if (prom_strtobool(++opt, &val))
prom_radix_disable = false;
else
prom_radix_disable = val;
@@ -1025,7 +1154,7 @@ static int __init prom_count_smt_threads(void)
type[0] = 0;
prom_getprop(node, "device_type", type, sizeof(type));
- if (strcmp(type, "cpu"))
+ if (prom_strcmp(type, "cpu"))
continue;
/*
* There is an entry for each smt thread, each entry being
@@ -1472,7 +1601,7 @@ static void __init prom_init_mem(void)
*/
prom_getprop(node, "name", type, sizeof(type));
}
- if (strcmp(type, "memory"))
+ if (prom_strcmp(type, "memory"))
continue;
plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
@@ -1753,19 +1882,19 @@ static void __init prom_initialize_tce_table(void)
prom_getprop(node, "device_type", type, sizeof(type));
prom_getprop(node, "model", model, sizeof(model));
- if ((type[0] == 0) || (strstr(type, "pci") == NULL))
+ if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL))
continue;
/* Keep the old logic intact to avoid regression. */
if (compatible[0] != 0) {
- if ((strstr(compatible, "python") == NULL) &&
- (strstr(compatible, "Speedwagon") == NULL) &&
- (strstr(compatible, "Winnipeg") == NULL))
+ if ((prom_strstr(compatible, "python") == NULL) &&
+ (prom_strstr(compatible, "Speedwagon") == NULL) &&
+ (prom_strstr(compatible, "Winnipeg") == NULL))
continue;
} else if (model[0] != 0) {
- if ((strstr(model, "ython") == NULL) &&
- (strstr(model, "peedwagon") == NULL) &&
- (strstr(model, "innipeg") == NULL))
+ if ((prom_strstr(model, "ython") == NULL) &&
+ (prom_strstr(model, "peedwagon") == NULL) &&
+ (prom_strstr(model, "innipeg") == NULL))
continue;
}
@@ -1914,12 +2043,12 @@ static void __init prom_hold_cpus(void)
type[0] = 0;
prom_getprop(node, "device_type", type, sizeof(type));
- if (strcmp(type, "cpu") != 0)
+ if (prom_strcmp(type, "cpu") != 0)
continue;
/* Skip non-configured cpus. */
if (prom_getprop(node, "status", type, sizeof(type)) > 0)
- if (strcmp(type, "okay") != 0)
+ if (prom_strcmp(type, "okay") != 0)
continue;
reg = cpu_to_be32(-1); /* make sparse happy */
@@ -1995,9 +2124,9 @@ static void __init prom_find_mmu(void)
return;
version[sizeof(version) - 1] = 0;
/* XXX might need to add other versions here */
- if (strcmp(version, "Open Firmware, 1.0.5") == 0)
+ if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0)
of_workarounds = OF_WA_CLAIM;
- else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
+ else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) {
of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
} else
@@ -2030,7 +2159,7 @@ static void __init prom_init_stdout(void)
call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
prom_printf("OF stdout device is: %s\n", of_stdout_device);
prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
- path, strlen(path) + 1);
+ path, prom_strlen(path) + 1);
/* instance-to-package fails on PA-Semi */
stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
@@ -2040,7 +2169,7 @@ static void __init prom_init_stdout(void)
/* If it's a display, note it */
memset(type, 0, sizeof(type));
prom_getprop(stdout_node, "device_type", type, sizeof(type));
- if (strcmp(type, "display") == 0)
+ if (prom_strcmp(type, "display") == 0)
prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
}
}
@@ -2061,19 +2190,19 @@ static int __init prom_find_machine_type(void)
compat[len] = 0;
while (i < len) {
char *p = &compat[i];
- int sl = strlen(p);
+ int sl = prom_strlen(p);
if (sl == 0)
break;
- if (strstr(p, "Power Macintosh") ||
- strstr(p, "MacRISC"))
+ if (prom_strstr(p, "Power Macintosh") ||
+ prom_strstr(p, "MacRISC"))
return PLATFORM_POWERMAC;
#ifdef CONFIG_PPC64
/* We must make sure we don't detect the IBM Cell
* blades as pSeries due to some firmware issues,
* so we do it here.
*/
- if (strstr(p, "IBM,CBEA") ||
- strstr(p, "IBM,CPBW-1.0"))
+ if (prom_strstr(p, "IBM,CBEA") ||
+ prom_strstr(p, "IBM,CPBW-1.0"))
return PLATFORM_GENERIC;
#endif /* CONFIG_PPC64 */
i += sl + 1;
@@ -2090,7 +2219,7 @@ static int __init prom_find_machine_type(void)
compat, sizeof(compat)-1);
if (len <= 0)
return PLATFORM_GENERIC;
- if (strcmp(compat, "chrp"))
+ if (prom_strcmp(compat, "chrp"))
return PLATFORM_GENERIC;
/* Default to pSeries. We need to know if we are running LPAR */
@@ -2152,7 +2281,7 @@ static void __init prom_check_displays(void)
for (node = 0; prom_next_node(&node); ) {
memset(type, 0, sizeof(type));
prom_getprop(node, "device_type", type, sizeof(type));
- if (strcmp(type, "display") != 0)
+ if (prom_strcmp(type, "display") != 0)
continue;
/* It seems OF doesn't null-terminate the path :-( */
@@ -2256,9 +2385,9 @@ static unsigned long __init dt_find_string(char *str)
s = os = (char *)dt_string_start;
s += 4;
while (s < (char *)dt_string_end) {
- if (strcmp(s, str) == 0)
+ if (prom_strcmp(s, str) == 0)
return s - os;
- s += strlen(s) + 1;
+ s += prom_strlen(s) + 1;
}
return 0;
}
@@ -2291,7 +2420,7 @@ static void __init scan_dt_build_strings(phandle node,
}
/* skip "name" */
- if (strcmp(namep, "name") == 0) {
+ if (prom_strcmp(namep, "name") == 0) {
*mem_start = (unsigned long)namep;
prev_name = "name";
continue;
@@ -2303,7 +2432,7 @@ static void __init scan_dt_build_strings(phandle node,
namep = sstart + soff;
} else {
/* Trim off some if we can */
- *mem_start = (unsigned long)namep + strlen(namep) + 1;
+ *mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
dt_string_end = *mem_start;
}
prev_name = namep;
@@ -2372,7 +2501,7 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
break;
/* skip "name" */
- if (strcmp(pname, "name") == 0) {
+ if (prom_strcmp(pname, "name") == 0) {
prev_name = "name";
continue;
}
@@ -2403,7 +2532,7 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
call_prom("getprop", 4, 1, node, pname, valp, l);
*mem_start = _ALIGN(*mem_start, 4);
- if (!strcmp(pname, "phandle"))
+ if (!prom_strcmp(pname, "phandle"))
has_phandle = 1;
}
@@ -2473,8 +2602,8 @@ static void __init flatten_device_tree(void)
/* Add "phandle" in there, we'll need it */
namep = make_room(&mem_start, &mem_end, 16, 1);
- strcpy(namep, "phandle");
- mem_start = (unsigned long)namep + strlen(namep) + 1;
+ prom_strcpy(namep, "phandle");
+ mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
/* Build string array */
prom_printf("Building dt strings...\n");
@@ -2796,7 +2925,7 @@ static void __init fixup_device_tree_efika(void)
rv = prom_getprop(node, "model", prop, sizeof(prop));
if (rv == PROM_ERROR)
return;
- if (strcmp(prop, "EFIKA5K2"))
+ if (prom_strcmp(prop, "EFIKA5K2"))
return;
prom_printf("Applying EFIKA device tree fixups\n");
@@ -2804,13 +2933,13 @@ static void __init fixup_device_tree_efika(void)
/* Claiming to be 'chrp' is death */
node = call_prom("finddevice", 1, 1, ADDR("/"));
rv = prom_getprop(node, "device_type", prop, sizeof(prop));
- if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
+ if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0))
prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
/* CODEGEN,description is exposed in /proc/cpuinfo so
fix that too */
rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
- if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
+ if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP")))
prom_setprop(node, "/", "CODEGEN,description",
"Efika 5200B PowerPC System",
sizeof("Efika 5200B PowerPC System"));
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index 181fd10008ef..4cac45cb5de5 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -27,7 +27,7 @@ fi
WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
_end enter_prom $MEM_FUNCS reloc_offset __secondary_hold
__secondary_hold_acknowledge __secondary_hold_spinloop __start
-strcmp strcpy strlcpy strlen strncmp strstr kstrtobool logo_linux_clut224
+logo_linux_clut224
reloc_got2 kernstart_addr memstart_addr linux_banner _stext
__prom_init_toc_start __prom_init_toc_end btext_setup_display TOC."
--
2.13.3
^ permalink raw reply related
* [PATCH v10 07/18] powerpc/32: use memset() instead of memset_io() to zero BSS
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
Since commit 400c47d81ca38 ("powerpc32: memset: only use dcbz once cache is
enabled"), memset() can be used before activation of the cache,
so no need to use memset_io() for zeroing the BSS.
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/early_32.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/early_32.c b/arch/powerpc/kernel/early_32.c
index cf3cdd81dc47..3482118ffe76 100644
--- a/arch/powerpc/kernel/early_32.c
+++ b/arch/powerpc/kernel/early_32.c
@@ -21,8 +21,8 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
{
unsigned long offset = reloc_offset();
- /* First zero the BSS -- use memset_io, some platforms don't have caches on yet */
- memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
+ /* First zero the BSS */
+ memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
/*
* Identify the CPU type and fix up code sections
--
2.13.3
^ permalink raw reply related
* [PATCH v10 06/18] powerpc/mm: don't use direct assignation during early boot.
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
In kernel/cputable.c, explicitly use memcpy() instead of *y = *x;
This will allow GCC to replace it with __memcpy() when KASAN is
selected.
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/cputable.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 1eab54bc6ee9..cd12f362b61f 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -2147,7 +2147,11 @@ void __init set_cur_cpu_spec(struct cpu_spec *s)
struct cpu_spec *t = &the_cpu_spec;
t = PTRRELOC(t);
- *t = *s;
+ /*
+ * use memcpy() instead of *t = *s so that GCC replaces it
+ * by __memcpy() when KASAN is active
+ */
+ memcpy(t, s, sizeof(*t));
*PTRRELOC(&cur_cpu_spec) = &the_cpu_spec;
}
@@ -2161,8 +2165,11 @@ static struct cpu_spec * __init setup_cpu_spec(unsigned long offset,
t = PTRRELOC(t);
old = *t;
- /* Copy everything, then do fixups */
- *t = *s;
+ /*
+ * Copy everything, then do fixups. Use memcpy() instead of *t = *s
+ * so that GCC replaces it by __memcpy() when KASAN is active
+ */
+ memcpy(t, s, sizeof(*t));
/*
* If we are overriding a previous value derived from the real
--
2.13.3
^ permalink raw reply related
* [PATCH v10 00/18] KASAN for powerpc/32 and RFC for 64bit Book3E
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
This series adds KASAN support to powerpc/32
32 bits tested on nohash/32 (8xx), book3s/32 (mpc832x ie 603) and qemu mac99
64bit Book3E tested by Daniel on e6500
Changes in v10:
- Prepended the patch which fixes boot on hash32
- Reduced ifdef mess related to CONFIG_CMDLINE in prom_init.c
- Fixed strings preparation macros for ppc64 build (Reported by Daniel)
- Fixed boot failure on hash32 when total amount of memory is above the initial amount mapped with BATs.
- Reordered stuff in kasan.h to have a smoother patch when adding 64bit Book3E
- Split the change to PAGE_READONLY out of the hash32 patch.
- Appended Daniel's series for 64bit Book3E (with a build failure fix and a few cosmetic changes)
Changes in v9:
- Fixed fixmap IMMR alignment issue on 8xx with KASAN enabled.
- Set up final shadow page tables before switching to the final hash table on hash32
- Using PAGE_READONLY instead of PAGE_KERNEL_RO on hash32
- Use flash_tlb_kernel_range() instead of flash_tlb_mm() which doesn't work for kernel on some subarches.
- use __set_pte_at() instead of pte_update() to install final page tables
Changes in v8:
- Fixed circular issue between pgtable.h and fixmap.h
- Added missing includes in ppc64 string files
- Fixed kasan string related macro names for ppc64.
- Fixed most checkpatch messages
- build tested on kisskb (http://kisskb.ellerman.id.au/kisskb/head/6e65827de2fe71d21682dafd9084ed2cc6e06d4f/)
- moved CONFIG_KASAN_SHADOW_OFFSET in Kconfig.debug
Changes in v7:
- split in several smaller patches
- prom_init now has its own string functions
- full deactivation of powerpc-optimised string functions when KASAN is active
- shadow area now at a fixed place on very top of kernel virtual space.
- Early static hash table for hash book3s/32.
- Full support of both inline and outline instrumentation for both hash and nohash ppc32
- Earlier full activation of kasan.
Changes in v6:
- Fixed oops on module loading (due to access to RO shadow zero area).
- Added support for hash book3s/32, thanks to Daniel's patch to differ KASAN activation.
- Reworked handling of optimised string functions (dedicated patch for it)
- Reordered some files to ease adding of book3e/64 support.
Changes in v5:
- Added KASAN_SHADOW_OFFSET in Makefile, otherwise we fallback to KASAN_MINIMAL
and some stuff like stack instrumentation is not performed
- Moved calls to kasan_early_init() in head.S because stack instrumentation
in machine_init was performed before the call to kasan_early_init()
- Mapping kasan_early_shadow_page RW in kasan_early_init() and
remaping RO later in kasan_init()
- Allocating a big memblock() for shadow area, falling back to PAGE_SIZE blocks in case of failure.
Changes in v4:
- Comments from Andrey (DISABLE_BRANCH_PROFILING, Activation of reports)
- Proper initialisation of shadow area in kasan_init()
- Panic in case Hash table is required.
- Added comments in patch one to explain why *t = *s becomes memcpy(t, s, ...)
- Call of kasan_init_tags()
Changes in v3:
- Removed the printk() in kasan_early_init() to avoid build failure (see https://github.com/linuxppc/issues/issues/218)
- Added necessary changes in asm/book3s/32/pgtable.h to get it work on powerpc 603 family
- Added a few KASAN_SANITIZE_xxx.o := n to successfully boot on powerpc 603 family
Changes in v2:
- Rebased.
- Using __set_pte_at() to build the early table.
- Worked around and got rid of the patch adding asm/page.h in asm/pgtable-types.h
==> might be fixed independently but not needed for this serie.
Christophe Leroy (18):
powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32
powerpc/32: Move early_init() in a separate file
powerpc: prepare string/mem functions for KASAN
powerpc: remove CONFIG_CMDLINE #ifdef mess
powerpc/prom_init: don't use string functions from lib/
powerpc/mm: don't use direct assignation during early boot.
powerpc/32: use memset() instead of memset_io() to zero BSS
powerpc/32: make KVIRT_TOP dependent on FIXMAP_START
powerpc/32: prepare shadow area for KASAN
powerpc: disable KASAN instrumentation on early/critical files.
powerpc/32: Add KASAN support
powerpc/32s: move hash code patching out of MMU_init_hw()
powerpc/32s: set up an early static hash table for KASAN.
powerpc/32s: map kasan zero shadow with PAGE_READONLY instead of
PAGE_KERNEL_RO
kasan: do not open-code addr_has_shadow
kasan: allow architectures to manage the memory-to-shadow mapping
kasan: allow architectures to provide an outline readiness check
powerpc: KASAN for 64bit Book3E
arch/powerpc/Kconfig | 8 +-
arch/powerpc/Kconfig.debug | 5 +
arch/powerpc/include/asm/book3s/32/pgtable.h | 13 +-
arch/powerpc/include/asm/fixmap.h | 5 +
arch/powerpc/include/asm/kasan.h | 111 ++++++++++++++
arch/powerpc/include/asm/nohash/32/pgtable.h | 13 +-
arch/powerpc/include/asm/string.h | 32 +++-
arch/powerpc/kernel/Makefile | 14 +-
arch/powerpc/kernel/cpu_setup_6xx.S | 3 -
arch/powerpc/kernel/cputable.c | 13 +-
arch/powerpc/kernel/early_32.c | 36 +++++
arch/powerpc/kernel/head_32.S | 52 +++++--
arch/powerpc/kernel/head_40x.S | 3 +
arch/powerpc/kernel/head_44x.S | 3 +
arch/powerpc/kernel/head_8xx.S | 3 +
arch/powerpc/kernel/head_fsl_booke.S | 3 +
arch/powerpc/kernel/prom_init.c | 218 +++++++++++++++++++++------
arch/powerpc/kernel/prom_init_check.sh | 12 +-
arch/powerpc/kernel/setup-common.c | 3 +
arch/powerpc/kernel/setup_32.c | 28 ----
arch/powerpc/lib/Makefile | 19 ++-
arch/powerpc/lib/copy_32.S | 12 +-
arch/powerpc/lib/mem_64.S | 9 +-
arch/powerpc/lib/memcpy_64.S | 4 +-
arch/powerpc/mm/Makefile | 9 ++
arch/powerpc/mm/hash_low_32.S | 8 +-
arch/powerpc/mm/init_32.c | 3 +
arch/powerpc/mm/kasan/Makefile | 6 +
arch/powerpc/mm/kasan/kasan_init_32.c | 183 ++++++++++++++++++++++
arch/powerpc/mm/kasan/kasan_init_book3e_64.c | 50 ++++++
arch/powerpc/mm/mem.c | 4 +
arch/powerpc/mm/mmu_decl.h | 2 +
arch/powerpc/mm/ppc_mmu_32.c | 36 +++--
arch/powerpc/mm/ptdump/ptdump.c | 8 +
arch/powerpc/platforms/powermac/Makefile | 6 +
arch/powerpc/purgatory/Makefile | 3 +
arch/powerpc/xmon/Makefile | 1 +
include/linux/kasan.h | 6 +
mm/kasan/generic.c | 6 +-
mm/kasan/generic_report.c | 2 +-
mm/kasan/kasan.h | 6 +-
mm/kasan/report.c | 6 +-
mm/kasan/tags.c | 3 +-
43 files changed, 829 insertions(+), 141 deletions(-)
create mode 100644 arch/powerpc/include/asm/kasan.h
create mode 100644 arch/powerpc/kernel/early_32.c
create mode 100644 arch/powerpc/mm/kasan/Makefile
create mode 100644 arch/powerpc/mm/kasan/kasan_init_32.c
create mode 100644 arch/powerpc/mm/kasan/kasan_init_book3e_64.c
--
2.13.3
^ permalink raw reply
* [PATCH v10 01/18] powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
Not only the 603 but all 6xx need SPRN_SPRG_PGDIR to be initialised at
startup. This patch move it from __setup_cpu_603() to start_here()
and __secondary_start(), close to the initialisation of SPRN_THREAD.
Previously, virt addr of PGDIR was retrieved from thread struct.
Now that it is the phys addr which is stored in SPRN_SPRG_PGDIR,
hash_page() shall not convert it to phys anymore.
This patch removes the conversion.
Fixes: 93c4a162b014("powerpc/6xx: Store PGDIR physical address in a SPRG")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/cpu_setup_6xx.S | 3 ---
arch/powerpc/kernel/head_32.S | 6 ++++++
arch/powerpc/mm/hash_low_32.S | 8 ++++----
3 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S
index 6f1c11e0691f..7534ecff5e92 100644
--- a/arch/powerpc/kernel/cpu_setup_6xx.S
+++ b/arch/powerpc/kernel/cpu_setup_6xx.S
@@ -24,9 +24,6 @@ BEGIN_MMU_FTR_SECTION
li r10,0
mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */
END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
- lis r10, (swapper_pg_dir - PAGE_OFFSET)@h
- ori r10, r10, (swapper_pg_dir - PAGE_OFFSET)@l
- mtspr SPRN_SPRG_PGDIR, r10
BEGIN_FTR_SECTION
bl __init_fpu_registers
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index ce6a972f2584..48051c8977c5 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -855,6 +855,9 @@ __secondary_start:
li r3,0
stw r3, RTAS_SP(r4) /* 0 => not in RTAS */
#endif
+ lis r4, (swapper_pg_dir - PAGE_OFFSET)@h
+ ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
+ mtspr SPRN_SPRG_PGDIR, r4
/* enable MMU and jump to start_secondary */
li r4,MSR_KERNEL
@@ -942,6 +945,9 @@ start_here:
li r3,0
stw r3, RTAS_SP(r4) /* 0 => not in RTAS */
#endif
+ lis r4, (swapper_pg_dir - PAGE_OFFSET)@h
+ ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
+ mtspr SPRN_SPRG_PGDIR, r4
/* stack */
lis r1,init_thread_union@ha
diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S
index 1f13494efb2b..a6c491f18a04 100644
--- a/arch/powerpc/mm/hash_low_32.S
+++ b/arch/powerpc/mm/hash_low_32.S
@@ -70,12 +70,12 @@ _GLOBAL(hash_page)
lis r0,KERNELBASE@h /* check if kernel address */
cmplw 0,r4,r0
ori r3,r3,_PAGE_USER|_PAGE_PRESENT /* test low addresses as user */
- mfspr r5, SPRN_SPRG_PGDIR /* virt page-table root */
+ mfspr r5, SPRN_SPRG_PGDIR /* phys page-table root */
blt+ 112f /* assume user more likely */
- lis r5,swapper_pg_dir@ha /* if kernel address, use */
- addi r5,r5,swapper_pg_dir@l /* kernel page table */
+ lis r5, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */
+ addi r5 ,r5 ,(swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */
rlwimi r3,r9,32-12,29,29 /* MSR_PR -> _PAGE_USER */
-112: tophys(r5, r5)
+112:
#ifndef CONFIG_PTE_64BIT
rlwimi r5,r4,12,20,29 /* insert top 10 bits of address */
lwz r8,0(r5) /* get pmd entry */
--
2.13.3
^ permalink raw reply related
* [PATCH v10 02/18] powerpc/32: Move early_init() in a separate file
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
In preparation of KASAN, move early_init() into a separate
file in order to allow deactivation of KASAN for that function.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/Makefile | 2 +-
arch/powerpc/kernel/early_32.c | 36 ++++++++++++++++++++++++++++++++++++
arch/powerpc/kernel/setup_32.c | 28 ----------------------------
3 files changed, 37 insertions(+), 29 deletions(-)
create mode 100644 arch/powerpc/kernel/early_32.c
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index cddadccf551d..45e47752b692 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -93,7 +93,7 @@ extra-y += vmlinux.lds
obj-$(CONFIG_RELOCATABLE) += reloc_$(BITS).o
-obj-$(CONFIG_PPC32) += entry_32.o setup_32.o
+obj-$(CONFIG_PPC32) += entry_32.o setup_32.o early_32.o
obj-$(CONFIG_PPC64) += dma-iommu.o iommu.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_BOOTX_TEXT) += btext.o
diff --git a/arch/powerpc/kernel/early_32.c b/arch/powerpc/kernel/early_32.c
new file mode 100644
index 000000000000..cf3cdd81dc47
--- /dev/null
+++ b/arch/powerpc/kernel/early_32.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Early init before relocation
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
+#include <asm/asm-prototypes.h>
+
+/*
+ * We're called here very early in the boot.
+ *
+ * Note that the kernel may be running at an address which is different
+ * from the address that it was linked at, so we must use RELOC/PTRRELOC
+ * to access static data (including strings). -- paulus
+ */
+notrace unsigned long __init early_init(unsigned long dt_ptr)
+{
+ unsigned long offset = reloc_offset();
+
+ /* First zero the BSS -- use memset_io, some platforms don't have caches on yet */
+ memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
+
+ /*
+ * Identify the CPU type and fix up code sections
+ * that depend on which cpu we have.
+ */
+ identify_cpu(offset, mfspr(SPRN_PVR));
+
+ apply_feature_fixups();
+
+ return KERNELBASE + offset;
+}
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 4a65e08a6042..3fb9f64f88fd 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -64,34 +64,6 @@ EXPORT_SYMBOL(DMA_MODE_READ);
EXPORT_SYMBOL(DMA_MODE_WRITE);
/*
- * We're called here very early in the boot.
- *
- * Note that the kernel may be running at an address which is different
- * from the address that it was linked at, so we must use RELOC/PTRRELOC
- * to access static data (including strings). -- paulus
- */
-notrace unsigned long __init early_init(unsigned long dt_ptr)
-{
- unsigned long offset = reloc_offset();
-
- /* First zero the BSS -- use memset_io, some platforms don't have
- * caches on yet */
- memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
- __bss_stop - __bss_start);
-
- /*
- * Identify the CPU type and fix up code sections
- * that depend on which cpu we have.
- */
- identify_cpu(offset, mfspr(SPRN_PVR));
-
- apply_feature_fixups();
-
- return KERNELBASE + offset;
-}
-
-
-/*
* This is run before start_kernel(), the kernel has been relocated
* and we are running with enough of the MMU enabled to have our
* proper kernel virtual addresses
--
2.13.3
^ permalink raw reply related
* [PATCH v10 04/18] powerpc: remove CONFIG_CMDLINE #ifdef mess
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
This patch makes CONFIG_CMDLINE defined at all time. It avoids
having to enclose related code inside #ifdef CONFIG_CMDLINE
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/Kconfig | 6 +++---
arch/powerpc/kernel/prom_init.c | 9 +++------
2 files changed, 6 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b5dce13a6132..facaa6ba0d2a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -833,9 +833,9 @@ config CMDLINE_BOOL
bool "Default bootloader kernel arguments"
config CMDLINE
- string "Initial kernel command string"
- depends on CMDLINE_BOOL
- default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
+ string "Initial kernel command string" if CMDLINE_BOOL
+ default "console=ttyS0,9600 console=tty0 root=/dev/sda2" if CMDLINE_BOOL
+ default ""
help
On some platforms, there is currently no way for the boot loader to
pass arguments to the kernel. For these platforms, you can supply
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index f33ff4163a51..ecf083c46bdb 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -631,17 +631,14 @@ static void __init early_cmdline_parse(void)
const char *opt;
char *p;
- int l __maybe_unused = 0;
+ int l = 0;
prom_cmd_line[0] = 0;
p = prom_cmd_line;
if ((long)prom.chosen > 0)
l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
-#ifdef CONFIG_CMDLINE
- if (l <= 0 || p[0] == '\0') /* dbl check */
- strlcpy(prom_cmd_line,
- CONFIG_CMDLINE, sizeof(prom_cmd_line));
-#endif /* CONFIG_CMDLINE */
+ if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && (l <= 0 || p[0] == '\0')) /* dbl check */
+ strlcpy(prom_cmd_line, CONFIG_CMDLINE, sizeof(prom_cmd_line));
prom_printf("command line: %s\n", prom_cmd_line);
#ifdef CONFIG_PPC64
--
2.13.3
^ permalink raw reply related
* [PATCH v10 03/18] powerpc: prepare string/mem functions for KASAN
From: Christophe Leroy @ 2019-03-12 22:16 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Nicholas Piggin, Aneesh Kumar K.V, Andrey Ryabinin,
Alexander Potapenko, Dmitry Vyukov, Daniel Axtens
Cc: linux-mm, linuxppc-dev, linux-kernel, kasan-dev
In-Reply-To: <cover.1552428161.git.christophe.leroy@c-s.fr>
CONFIG_KASAN implements wrappers for memcpy() memmove() and memset()
Those wrappers are doing the verification then call respectively
__memcpy() __memmove() and __memset(). The arches are therefore
expected to rename their optimised functions that way.
For files on which KASAN is inhibited, #defines are used to allow
them to directly call optimised versions of the functions without
going through the KASAN wrappers.
See commit 393f203f5fd5 ("x86_64: kasan: add interceptors for
memset/memmove/memcpy functions") for details.
Other string / mem functions do not (yet) have kasan wrappers,
we therefore have to fallback to the generic versions when
KASAN is active, otherwise KASAN checks will be skipped.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/kasan.h | 15 +++++++++++++++
arch/powerpc/include/asm/string.h | 32 +++++++++++++++++++++++++++++---
arch/powerpc/kernel/prom_init_check.sh | 10 +++++++++-
arch/powerpc/lib/Makefile | 11 ++++++++---
arch/powerpc/lib/copy_32.S | 12 +++++++++---
arch/powerpc/lib/mem_64.S | 9 +++++++--
arch/powerpc/lib/memcpy_64.S | 4 +++-
7 files changed, 80 insertions(+), 13 deletions(-)
create mode 100644 arch/powerpc/include/asm/kasan.h
diff --git a/arch/powerpc/include/asm/kasan.h b/arch/powerpc/include/asm/kasan.h
new file mode 100644
index 000000000000..2c179a39d4ba
--- /dev/null
+++ b/arch/powerpc/include/asm/kasan.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_KASAN_H
+#define __ASM_KASAN_H
+
+#ifdef CONFIG_KASAN
+#define _GLOBAL_KASAN(fn) _GLOBAL(__##fn)
+#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(__##fn)
+#define EXPORT_SYMBOL_KASAN(fn) EXPORT_SYMBOL(__##fn)
+#else
+#define _GLOBAL_KASAN(fn) _GLOBAL(fn)
+#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(fn)
+#define EXPORT_SYMBOL_KASAN(fn)
+#endif
+
+#endif
diff --git a/arch/powerpc/include/asm/string.h b/arch/powerpc/include/asm/string.h
index 1647de15a31e..9bf6dffb4090 100644
--- a/arch/powerpc/include/asm/string.h
+++ b/arch/powerpc/include/asm/string.h
@@ -4,14 +4,17 @@
#ifdef __KERNEL__
+#ifndef CONFIG_KASAN
#define __HAVE_ARCH_STRNCPY
#define __HAVE_ARCH_STRNCMP
+#define __HAVE_ARCH_MEMCHR
+#define __HAVE_ARCH_MEMCMP
+#define __HAVE_ARCH_MEMSET16
+#endif
+
#define __HAVE_ARCH_MEMSET
#define __HAVE_ARCH_MEMCPY
#define __HAVE_ARCH_MEMMOVE
-#define __HAVE_ARCH_MEMCMP
-#define __HAVE_ARCH_MEMCHR
-#define __HAVE_ARCH_MEMSET16
#define __HAVE_ARCH_MEMCPY_FLUSHCACHE
extern char * strcpy(char *,const char *);
@@ -27,7 +30,27 @@ extern int memcmp(const void *,const void *,__kernel_size_t);
extern void * memchr(const void *,int,__kernel_size_t);
extern void * memcpy_flushcache(void *,const void *,__kernel_size_t);
+void *__memset(void *s, int c, __kernel_size_t count);
+void *__memcpy(void *to, const void *from, __kernel_size_t n);
+void *__memmove(void *to, const void *from, __kernel_size_t n);
+
+#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
+/*
+ * For files that are not instrumented (e.g. mm/slub.c) we
+ * should use not instrumented version of mem* functions.
+ */
+#define memcpy(dst, src, len) __memcpy(dst, src, len)
+#define memmove(dst, src, len) __memmove(dst, src, len)
+#define memset(s, c, n) __memset(s, c, n)
+
+#ifndef __NO_FORTIFY
+#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
+#endif
+
+#endif
+
#ifdef CONFIG_PPC64
+#ifndef CONFIG_KASAN
#define __HAVE_ARCH_MEMSET32
#define __HAVE_ARCH_MEMSET64
@@ -49,8 +72,11 @@ static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
{
return __memset64(p, v, n * 8);
}
+#endif
#else
+#ifndef CONFIG_KASAN
#define __HAVE_ARCH_STRLEN
+#endif
extern void *memset16(uint16_t *, uint16_t, __kernel_size_t);
#endif
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index 667df97d2595..181fd10008ef 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -16,8 +16,16 @@
# If you really need to reference something from prom_init.o add
# it to the list below:
+grep "^CONFIG_KASAN=y$" .config >/dev/null
+if [ $? -eq 0 ]
+then
+ MEM_FUNCS="__memcpy __memset"
+else
+ MEM_FUNCS="memcpy memset"
+fi
+
WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
-_end enter_prom memcpy memset reloc_offset __secondary_hold
+_end enter_prom $MEM_FUNCS reloc_offset __secondary_hold
__secondary_hold_acknowledge __secondary_hold_spinloop __start
strcmp strcpy strlcpy strlen strncmp strstr kstrtobool logo_linux_clut224
reloc_got2 kernstart_addr memstart_addr linux_banner _stext
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 79396e184bca..47a4de434c22 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -8,9 +8,14 @@ ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
CFLAGS_REMOVE_code-patching.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_feature-fixups.o = $(CC_FLAGS_FTRACE)
-obj-y += string.o alloc.o code-patching.o feature-fixups.o
+obj-y += alloc.o code-patching.o feature-fixups.o
-obj-$(CONFIG_PPC32) += div64.o copy_32.o crtsavres.o strlen_32.o
+ifndef CONFIG_KASAN
+obj-y += string.o memcmp_$(BITS).o
+obj-$(CONFIG_PPC32) += strlen_32.o
+endif
+
+obj-$(CONFIG_PPC32) += div64.o copy_32.o crtsavres.o
obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
@@ -34,7 +39,7 @@ obj64-$(CONFIG_KPROBES_SANITY_TEST) += test_emulate_step.o \
test_emulate_step_exec_instr.o
obj-y += checksum_$(BITS).o checksum_wrappers.o \
- string_$(BITS).o memcmp_$(BITS).o
+ string_$(BITS).o
obj-y += sstep.o ldstfp.o quad.o
obj64-y += quad.o
diff --git a/arch/powerpc/lib/copy_32.S b/arch/powerpc/lib/copy_32.S
index ba66846fe973..d5642481fb98 100644
--- a/arch/powerpc/lib/copy_32.S
+++ b/arch/powerpc/lib/copy_32.S
@@ -14,6 +14,7 @@
#include <asm/ppc_asm.h>
#include <asm/export.h>
#include <asm/code-patching-asm.h>
+#include <asm/kasan.h>
#define COPY_16_BYTES \
lwz r7,4(r4); \
@@ -68,6 +69,7 @@ CACHELINE_BYTES = L1_CACHE_BYTES
LG_CACHELINE_BYTES = L1_CACHE_SHIFT
CACHELINE_MASK = (L1_CACHE_BYTES-1)
+#ifndef CONFIG_KASAN
_GLOBAL(memset16)
rlwinm. r0 ,r5, 31, 1, 31
addi r6, r3, -4
@@ -81,6 +83,7 @@ _GLOBAL(memset16)
sth r4, 4(r6)
blr
EXPORT_SYMBOL(memset16)
+#endif
/*
* Use dcbz on the complete cache lines in the destination
@@ -91,7 +94,7 @@ EXPORT_SYMBOL(memset16)
* We therefore skip the optimised bloc that uses dcbz. This jump is
* replaced by a nop once cache is active. This is done in machine_init()
*/
-_GLOBAL(memset)
+_GLOBAL_KASAN(memset)
cmplwi 0,r5,4
blt 7f
@@ -151,6 +154,7 @@ _GLOBAL(memset)
bdnz 9b
blr
EXPORT_SYMBOL(memset)
+EXPORT_SYMBOL_KASAN(memset)
/*
* This version uses dcbz on the complete cache lines in the
@@ -163,12 +167,12 @@ EXPORT_SYMBOL(memset)
* We therefore jump to generic_memcpy which doesn't use dcbz. This jump is
* replaced by a nop once cache is active. This is done in machine_init()
*/
-_GLOBAL(memmove)
+_GLOBAL_KASAN(memmove)
cmplw 0,r3,r4
bgt backwards_memcpy
/* fall through */
-_GLOBAL(memcpy)
+_GLOBAL_KASAN(memcpy)
1: b generic_memcpy
patch_site 1b, patch__memcpy_nocache
@@ -244,6 +248,8 @@ _GLOBAL(memcpy)
65: blr
EXPORT_SYMBOL(memcpy)
EXPORT_SYMBOL(memmove)
+EXPORT_SYMBOL_KASAN(memcpy)
+EXPORT_SYMBOL_KASAN(memmove)
generic_memcpy:
srwi. r7,r5,3
diff --git a/arch/powerpc/lib/mem_64.S b/arch/powerpc/lib/mem_64.S
index 3c3be02f33b7..7f6bd031c306 100644
--- a/arch/powerpc/lib/mem_64.S
+++ b/arch/powerpc/lib/mem_64.S
@@ -12,7 +12,9 @@
#include <asm/errno.h>
#include <asm/ppc_asm.h>
#include <asm/export.h>
+#include <asm/kasan.h>
+#ifndef CONFIG_KASAN
_GLOBAL(__memset16)
rlwimi r4,r4,16,0,15
/* fall through */
@@ -29,8 +31,9 @@ _GLOBAL(__memset64)
EXPORT_SYMBOL(__memset16)
EXPORT_SYMBOL(__memset32)
EXPORT_SYMBOL(__memset64)
+#endif
-_GLOBAL(memset)
+_GLOBAL_KASAN(memset)
neg r0,r3
rlwimi r4,r4,8,16,23
andi. r0,r0,7 /* # bytes to be 8-byte aligned */
@@ -96,8 +99,9 @@ _GLOBAL(memset)
stb r4,0(r6)
blr
EXPORT_SYMBOL(memset)
+EXPORT_SYMBOL_KASAN(memset)
-_GLOBAL_TOC(memmove)
+_GLOBAL_TOC_KASAN(memmove)
cmplw 0,r3,r4
bgt backwards_memcpy
b memcpy
@@ -139,3 +143,4 @@ _GLOBAL(backwards_memcpy)
mtctr r7
b 1b
EXPORT_SYMBOL(memmove)
+EXPORT_SYMBOL_KASAN(memmove)
diff --git a/arch/powerpc/lib/memcpy_64.S b/arch/powerpc/lib/memcpy_64.S
index 273ea67e60a1..25c3772c1dfb 100644
--- a/arch/powerpc/lib/memcpy_64.S
+++ b/arch/powerpc/lib/memcpy_64.S
@@ -11,6 +11,7 @@
#include <asm/export.h>
#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>
+#include <asm/kasan.h>
#ifndef SELFTEST_CASE
/* For big-endian, 0 == most CPUs, 1 == POWER6, 2 == Cell */
@@ -18,7 +19,7 @@
#endif
.align 7
-_GLOBAL_TOC(memcpy)
+_GLOBAL_TOC_KASAN(memcpy)
BEGIN_FTR_SECTION
#ifdef __LITTLE_ENDIAN__
cmpdi cr7,r5,0
@@ -230,3 +231,4 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
blr
#endif
EXPORT_SYMBOL(memcpy)
+EXPORT_SYMBOL_KASAN(memcpy)
--
2.13.3
^ permalink raw reply related
* Re: [PATCH] powerpc: sstep: Mark variable `rc` as unused in function 'analyse_instr'
From: Christophe Leroy @ 2019-03-12 21:25 UTC (permalink / raw)
To: Mathieu Malaterre; +Cc: Paul Mackerras, linuxppc-dev, LKML
In-Reply-To: <CA+7wUsyA698UtNLni7wi3=cKjbCd1V71YA0sxDtMD=MmQvQxTQ@mail.gmail.com>
Le 12/03/2019 à 22:12, Mathieu Malaterre a écrit :
> On Tue, Mar 12, 2019 at 9:56 PM Christophe Leroy
> <christophe.leroy@c-s.fr> wrote:
>>
>>
>>
>> Le 12/03/2019 à 21:20, Mathieu Malaterre a écrit :
>>> Add gcc attribute unused for `rc` variable.
>>>
>>> Fix warnings treated as errors with W=1:
>>>
>>> arch/powerpc/lib/sstep.c:1172:31: error: variable 'rc' set but not used [-Werror=unused-but-set-variable]
>>>
>>> Signed-off-by: Mathieu Malaterre <malat@debian.org>
>>> ---
>>> arch/powerpc/lib/sstep.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
>>> index 3d33fb509ef4..32d092f62ae0 100644
>>> --- a/arch/powerpc/lib/sstep.c
>>> +++ b/arch/powerpc/lib/sstep.c
>>> @@ -1169,7 +1169,7 @@ static nokprobe_inline int trap_compare(long v1, long v2)
>>> int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
>>> unsigned int instr)
>>> {
>>> - unsigned int opcode, ra, rb, rc, rd, spr, u;
>>> + unsigned int opcode, ra, rb, rc __maybe_unused, rd, spr, u;
>>
>> I think it would be better to enclose 'rc' inside a #ifdef CONFIG_PPC64
>
> Hum odd, I would have bet you would have suggested me to use
> IS_ENABLED with some crazy scheme (I was not able to mix it with the
> switch case nicely).
Well I guess yes, you could also get rid of the #ifdef __powerpc64__ and
instead add the following just after the 'case 4:'
if (!IS_ENABLED(CONFIG_64))
break;
That's less uggly than adding two #ifdef/#endif
Christophe
>
> Anyway I'll try your suggestion and post a v2.
>
>> Christophe
>>
>>> unsigned long int imm;
>>> unsigned long int val, val2;
>>> unsigned int mb, me, sh;
>>>
^ permalink raw reply
* [PATCH v2] powerpc/32: sstep: Move variable `rc` within CONFIG_PPC64 sentinels
From: Mathieu Malaterre @ 2019-03-12 21:23 UTC (permalink / raw)
To: Michael Ellerman
Cc: Mathieu Malaterre, linux-kernel, Paul Mackerras, linuxppc-dev
In-Reply-To: <20190312202008.29681-1-malat@debian.org>
Fix warnings treated as errors with W=1:
arch/powerpc/lib/sstep.c:1172:31: error: variable 'rc' set but not used [-Werror=unused-but-set-variable]
Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
---
v2: as suggested prefer CONFIG_PPC64 sentinel instead of unused keyword
arch/powerpc/lib/sstep.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 3d33fb509ef4..9996dc7a0b46 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1169,7 +1169,10 @@ static nokprobe_inline int trap_compare(long v1, long v2)
int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
unsigned int instr)
{
- unsigned int opcode, ra, rb, rc, rd, spr, u;
+ unsigned int opcode, ra, rb, rd, spr, u;
+#ifdef CONFIG_PPC64
+ unsigned int rc;
+#endif
unsigned long int imm;
unsigned long int val, val2;
unsigned int mb, me, sh;
@@ -1292,7 +1295,9 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
rd = (instr >> 21) & 0x1f;
ra = (instr >> 16) & 0x1f;
rb = (instr >> 11) & 0x1f;
+#ifdef CONFIG_PPC64
rc = (instr >> 6) & 0x1f;
+#endif
switch (opcode) {
#ifdef __powerpc64__
--
2.20.1
^ permalink raw reply related
* Re: [PATCH] powerpc: Make some functions static
From: Christophe Leroy @ 2019-03-12 21:14 UTC (permalink / raw)
To: Mathieu Malaterre, Michael Ellerman
Cc: linuxppc-dev, Paul Mackerras, linux-kernel
In-Reply-To: <20190312203140.31785-1-malat@debian.org>
Le 12/03/2019 à 21:31, Mathieu Malaterre a écrit :
> In commit cb9e4d10c448 ("[POWERPC] Add support for 750CL Holly board")
> new functions were added. Since these functions can be made static,
> make it so. While doing so, it turns out that holly_power_off and
> holly_halt are unused, so remove them.
I would have said 'since these functions are only used in this C file,
make them static'.
I think this could be split in two patches:
1/ Remove unused functions, ie holly_halt() and holly_power_off().
2/ Make the other ones static.
Christophe
>
> Silence the following warnings triggered using W=1:
>
> arch/powerpc/platforms/embedded6xx/holly.c:47:5: error: no previous prototype for 'holly_exclude_device' [-Werror=missing-prototypes]
> arch/powerpc/platforms/embedded6xx/holly.c:190:6: error: no previous prototype for 'holly_show_cpuinfo' [-Werror=missing-prototypes]
> arch/powerpc/platforms/embedded6xx/holly.c:196:17: error: no previous prototype for 'holly_restart' [-Werror=missing-prototypes]
> arch/powerpc/platforms/embedded6xx/holly.c:236:6: error: no previous prototype for 'holly_power_off' [-Werror=missing-prototypes]
> arch/powerpc/platforms/embedded6xx/holly.c:243:6: error: no previous prototype for 'holly_halt' [-Werror=missing-prototypes]
>
> Signed-off-by: Mathieu Malaterre <malat@debian.org>
> ---
> arch/powerpc/platforms/embedded6xx/holly.c | 19 ++++---------------
> 1 file changed, 4 insertions(+), 15 deletions(-)
>
> diff --git a/arch/powerpc/platforms/embedded6xx/holly.c b/arch/powerpc/platforms/embedded6xx/holly.c
> index 0409714e8070..829bf3697dc9 100644
> --- a/arch/powerpc/platforms/embedded6xx/holly.c
> +++ b/arch/powerpc/platforms/embedded6xx/holly.c
> @@ -44,7 +44,8 @@
>
> #define HOLLY_PCI_CFG_PHYS 0x7c000000
>
> -int holly_exclude_device(struct pci_controller *hose, u_char bus, u_char devfn)
> +static int holly_exclude_device(struct pci_controller *hose, u_char bus,
> + u_char devfn)
> {
> if (bus == 0 && PCI_SLOT(devfn) == 0)
> return PCIBIOS_DEVICE_NOT_FOUND;
> @@ -187,13 +188,13 @@ static void __init holly_init_IRQ(void)
> tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
> }
>
> -void holly_show_cpuinfo(struct seq_file *m)
> +static void holly_show_cpuinfo(struct seq_file *m)
> {
> seq_printf(m, "vendor\t\t: IBM\n");
> seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
> }
>
> -void __noreturn holly_restart(char *cmd)
> +static void __noreturn holly_restart(char *cmd)
> {
> __be32 __iomem *ocn_bar1 = NULL;
> unsigned long bar;
> @@ -233,18 +234,6 @@ void __noreturn holly_restart(char *cmd)
> for (;;) ;
> }
>
> -void holly_power_off(void)
> -{
> - local_irq_disable();
> - /* No way to shut power off with software */
> - for (;;) ;
> -}
> -
> -void holly_halt(void)
> -{
> - holly_power_off();
> -}
> -
> /*
> * Called very early, device-tree isn't unflattened
> */
>
^ permalink raw reply
* Re: [PATCH] powerpc: sstep: Mark variable `rc` as unused in function 'analyse_instr'
From: Mathieu Malaterre @ 2019-03-12 21:12 UTC (permalink / raw)
To: Christophe Leroy; +Cc: Paul Mackerras, linuxppc-dev, LKML
In-Reply-To: <57a0d93c-8784-d6af-a5fb-75e31455ae57@c-s.fr>
On Tue, Mar 12, 2019 at 9:56 PM Christophe Leroy
<christophe.leroy@c-s.fr> wrote:
>
>
>
> Le 12/03/2019 à 21:20, Mathieu Malaterre a écrit :
> > Add gcc attribute unused for `rc` variable.
> >
> > Fix warnings treated as errors with W=1:
> >
> > arch/powerpc/lib/sstep.c:1172:31: error: variable 'rc' set but not used [-Werror=unused-but-set-variable]
> >
> > Signed-off-by: Mathieu Malaterre <malat@debian.org>
> > ---
> > arch/powerpc/lib/sstep.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
> > index 3d33fb509ef4..32d092f62ae0 100644
> > --- a/arch/powerpc/lib/sstep.c
> > +++ b/arch/powerpc/lib/sstep.c
> > @@ -1169,7 +1169,7 @@ static nokprobe_inline int trap_compare(long v1, long v2)
> > int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
> > unsigned int instr)
> > {
> > - unsigned int opcode, ra, rb, rc, rd, spr, u;
> > + unsigned int opcode, ra, rb, rc __maybe_unused, rd, spr, u;
>
> I think it would be better to enclose 'rc' inside a #ifdef CONFIG_PPC64
Hum odd, I would have bet you would have suggested me to use
IS_ENABLED with some crazy scheme (I was not able to mix it with the
switch case nicely).
Anyway I'll try your suggestion and post a v2.
> Christophe
>
> > unsigned long int imm;
> > unsigned long int val, val2;
> > unsigned int mb, me, sh;
> >
^ permalink raw reply
* RE: [PATCH v2 2/2] crash_core, vmcoreinfo: Append 'MAX_PHYSMEM_BITS' to vmcoreinfo
From: Kazuhito Hagio @ 2019-03-12 19:47 UTC (permalink / raw)
To: Bhupesh Sharma
Cc: linuxppc-dev@lists.ozlabs.org, x86@kernel.org, Will Deacon,
linux-kernel@vger.kernel.org, kexec@lists.infradead.org,
James Morse, linux-arm-kernel@lists.infradead.org, Boris Petkov,
Thomas Gleixner, Dave Anderson, Ingo Molnar, Paul Mackerras
In-Reply-To: <1552212242-9479-3-git-send-email-bhsharma@redhat.com>
Hi Bhupesh,
-----Original Message-----
> Right now user-space tools like 'makedumpfile' and 'crash' need to rely
> on a best-guess method of determining value of 'MAX_PHYSMEM_BITS'
> supported by underlying kernel.
>
> This value is used in user-space code to calculate the bit-space
> required to store a section for SPARESMEM (similar to the existing
> calculation method used in the kernel implementation):
>
> #define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS)
>
> Now, regressions have been reported in user-space utilities
> like 'makedumpfile' and 'crash' on arm64, with the recently added
> kernel support for 52-bit physical address space, as there is
> no clear method of determining this value in user-space
> (other than reading kernel CONFIG flags).
>
> As per suggestion from makedumpfile maintainer (Kazu), it makes more
> sense to append 'MAX_PHYSMEM_BITS' to vmcoreinfo in the core code itself
> rather than in arch-specific code, so that the user-space code for other
> archs can also benefit from this addition to the vmcoreinfo and use it
> as a standard way of determining 'SECTIONS_SHIFT' value in user-land.
>
> A reference 'makedumpfile' implementation which reads the
> 'MAX_PHYSMEM_BITS' value from vmcoreinfo in a arch-independent fashion
> is available here:
>
> [0]. https://github.com/bhupesh-sharma/makedumpfile/blob/remove-max-phys-mem-bit-v1/arch/ppc64.c#L471
>
> Cc: Boris Petkov <bp@alien8.de>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: James Morse <james.morse@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Dave Anderson <anderson@redhat.com>
> Cc: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
> Cc: x86@kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Cc: kexec@lists.infradead.org
> Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
> ---
> kernel/crash_core.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 093c9f917ed0..44b90368e183 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -467,6 +467,7 @@ static int __init crash_save_vmcoreinfo_init(void)
> #define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
> VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
> #endif
> + VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
Some architectures define MAX_PHYSMEM_BITS only with CONFIG_SPARSEMEM,
so we need to move this to the #ifdef section that exports some
mem_section things.
Thanks!
Kazu
>
> arch_crash_save_vmcoreinfo();
> update_vmcoreinfo_note();
> --
> 2.7.4
>
^ permalink raw reply
* Re: [PATCH 00/14] entry: preempt_schedule_irq() callers scrub
From: Valentin Schneider @ 2019-03-12 18:18 UTC (permalink / raw)
To: Vineet Gupta, linux-kernel
Cc: uclinux-h8-devel, linux-xtensa, linux-ia64, linux-c6x-dev,
Julien Thierry, Peter Zijlstra, linux-s390, x86, linux-mips,
linux-m68k, Ingo Molnar, linux-sh, sparclinux, nios2-dev,
Thomas Gleixner, linux-snps-arc, linuxppc-dev, linux-riscv
In-Reply-To: <e604601e-f8e1-a8b5-d364-69ca967996ce@synopsys.com>
On 12/03/2019 18:03, Vineet Gupta wrote:
[...]
>> Regarding that loop, archs seem to fall in 3 categories:
>> A) Those that don't have the loop
>
> Please clarify that this is the right thing to do (since core code already has the
> loop) hence no fixing is required for this "category"
>
Right, those don't need any change. I had a brief look at them to double
check they had the proper need_resched() gate before calling
preempt_schedule_irq() (with no loop) and they all seem fine. Also...
>> B) Those that have a small need_resched() loop around the
>> preempt_schedule_irq() callsite
>> C) Those that branch to some more generic code further up the entry code
>> and eventually branch back to preempt_schedule_irq()
>>
>> arc, m68k, nios2 fall in A)
>
I forgot to include parisc in here.
[...]
^ permalink raw reply
* [PATCH 08/14] powerpc: entry: Remove unneeded need_resched() loop
From: Valentin Schneider @ 2019-03-11 22:47 UTC (permalink / raw)
To: linux-kernel; +Cc: Paul Mackerras, linuxppc-dev
In-Reply-To: <20190311224752.8337-1-valentin.schneider@arm.com>
Since the enabling and disabling of IRQs within preempt_schedule_irq()
is contained in a need_resched() loop, we don't need the outer arch
code loop.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
---
arch/powerpc/kernel/entry_32.S | 6 +-----
arch/powerpc/kernel/entry_64.S | 8 +-------
2 files changed, 2 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0768dfd8a64e..ff3fe3824a4a 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -896,11 +896,7 @@ resume_kernel:
*/
bl trace_hardirqs_off
#endif
-1: bl preempt_schedule_irq
- CURRENT_THREAD_INFO(r9, r1)
- lwz r3,TI_FLAGS(r9)
- andi. r0,r3,_TIF_NEED_RESCHED
- bne- 1b
+ bl preempt_schedule_irq
#ifdef CONFIG_TRACE_IRQFLAGS
/* And now, to properly rebalance the above, we tell lockdep they
* are being turned back on, which will happen when we return
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 435927f549c4..9c86c6826856 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -857,13 +857,7 @@ resume_kernel:
* sure we are soft-disabled first and reconcile irq state.
*/
RECONCILE_IRQ_STATE(r3,r4)
-1: bl preempt_schedule_irq
-
- /* Re-test flags and eventually loop */
- CURRENT_THREAD_INFO(r9, r1)
- ld r4,TI_FLAGS(r9)
- andi. r0,r4,_TIF_NEED_RESCHED
- bne 1b
+ bl preempt_schedule_irq
/*
* arch_local_irq_restore() from preempt_schedule_irq above may
--
2.20.1
^ permalink raw reply related
* [PATCH 00/14] entry: preempt_schedule_irq() callers scrub
From: Valentin Schneider @ 2019-03-11 22:47 UTC (permalink / raw)
To: linux-kernel
Cc: uclinux-h8-devel, linux-xtensa, linux-ia64, linux-c6x-dev,
Julien Thierry, Peter Zijlstra, linux-s390, x86, linux-mips,
linux-m68k, Ingo Molnar, linux-sh, sparclinux, nios2-dev,
Thomas Gleixner, linux-snps-arc, linuxppc-dev, linux-riscv
Hi,
This is the continuation of [1] where I'm hunting down
preempt_schedule_irq() callers because of [2].
I told myself the best way to get this moving forward wouldn't be to write
doc about it, but to go write some fixes and get some discussions going,
which is what this patch-set is about.
I've looked at users of preempt_schedule_irq(), and made sure they didn't
have one of those useless loops. The list of offenders is:
$ grep -r -I "preempt_schedule_irq" arch/ | cut -d/ -f2 | sort | uniq
arc
arm
arm64
c6x
csky
h8300
ia64
m68k
microblaze
mips
nds32
nios2
parisc
powerpc
riscv
s390
sh
sparc
x86
xtensa
Regarding that loop, archs seem to fall in 3 categories:
A) Those that don't have the loop
B) Those that have a small need_resched() loop around the
preempt_schedule_irq() callsite
C) Those that branch to some more generic code further up the entry code
and eventually branch back to preempt_schedule_irq()
arc, m68k, nios2 fall in A)
sparc, ia64, s390 fall in C)
all the others fall in B)
I've written patches for B) and C) EXCEPT for ia64 and s390 because I
haven't been able to tell if it's actually fine to kill that "long jump"
(and maybe I'm wrong on sparc). Hopefully folks who understand what goes on
in there might be able to shed some light.
Also, since I sent patches for arm & arm64 in [1] I'm not including them
here.
Boot-tested on:
- x86
Build-tested on:
- h8300
- c6x
- powerpc
- mips
- nds32
- microblaze
- sparc
- xtensa
Thanks,
Valentin
[1]: https://lore.kernel.org/lkml/20190131182339.9835-1-valentin.schneider@arm.com/
[2]: https://lore.kernel.org/lkml/cc989920-a13b-d53b-db83-1584a7f53edc@arm.com/
Valentin Schneider (14):
sched/core: Fix preempt_schedule() interrupt return comment
c6x: entry: Remove unneeded need_resched() loop
csky: entry: Remove unneeded need_resched() loop
h8300: entry: Remove unneeded need_resched() loop
microblaze: entry: Remove unneeded need_resched() loop
MIPS: entry: Remove unneeded need_resched() loop
nds32: ex-exit: Remove unneeded need_resched() loop
powerpc: entry: Remove unneeded need_resched() loop
RISC-V: entry: Remove unneeded need_resched() loop
sh: entry: Remove unneeded need_resched() loop
sh64: entry: Remove unneeded need_resched() loop
sparc64: rtrap: Remove unneeded need_resched() loop
x86/entry: Remove unneeded need_resched() loop
xtensa: entry: Remove unneeded need_resched() loop
arch/c6x/kernel/entry.S | 3 +--
arch/csky/kernel/entry.S | 4 ----
arch/h8300/kernel/entry.S | 3 +--
arch/microblaze/kernel/entry.S | 5 -----
arch/mips/kernel/entry.S | 3 +--
arch/nds32/kernel/ex-exit.S | 4 ++--
arch/powerpc/kernel/entry_32.S | 6 +-----
arch/powerpc/kernel/entry_64.S | 8 +-------
arch/riscv/kernel/entry.S | 3 +--
arch/sh/kernel/cpu/sh5/entry.S | 5 +----
arch/sh/kernel/entry-common.S | 4 +---
arch/sparc/kernel/rtrap_64.S | 1 -
arch/x86/entry/entry_32.S | 3 +--
arch/x86/entry/entry_64.S | 3 +--
arch/xtensa/kernel/entry.S | 2 +-
kernel/sched/core.c | 7 +++----
16 files changed, 16 insertions(+), 48 deletions(-)
--
2.20.1
^ permalink raw reply
* Re: [PATCH] powerpc/64s: Include <asm/nmi.h> header file to fix a warning
From: Christophe Leroy @ 2019-03-12 21:11 UTC (permalink / raw)
To: Mathieu Malaterre, Michael Ellerman
Cc: linuxppc-dev, Paul Mackerras, linux-kernel
In-Reply-To: <20190312201823.29371-1-malat@debian.org>
Le 12/03/2019 à 21:18, Mathieu Malaterre a écrit :
> Make sure to include <asm/nmi.h> to provide the following prototype:
> hv_nmi_check_nonrecoverable.
>
> Remove the following warning treated as error (W=1):
>
> arch/powerpc/kernel/traps.c:393:6: error: no previous prototype for 'hv_nmi_check_nonrecoverable' [-Werror=missing-prototypes]
>
> Signed-off-by: Mathieu Malaterre <malat@debian.org>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
> arch/powerpc/kernel/traps.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index a21200c6aaea..1fd45a8650e1 100644
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -71,6 +71,7 @@
> #include <sysdev/fsl_pci.h>
> #include <asm/kprobes.h>
> #include <asm/stacktrace.h>
> +#include <asm/nmi.h>
>
> #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE)
> int (*__debugger)(struct pt_regs *regs) __read_mostly;
>
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