[PATCH 26/29] objtool, x86: Add several functions and files to the objtool whitelist

Greg Kroah-Hartman
2018-06-03T12:29:58Z

From: Josh Poimboeuf <jpoimboe@redhat.com>

commit c207aee48037abca71c669cbec407b9891965c34 upstream.

In preparation for an objtool rewrite which will have broader checks,
whitelist functions and files which cause problems because they do
unusual things with the stack.

These whitelists serve as a TODO list for which functions and files
don't yet have undwarf unwinder coverage. Eventually most of the
whitelists can be removed in favor of manual CFI hint annotations or
objtool improvements.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/7f934a5d707a574bda33ea282e9478e627fb1829.1498659915.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/crypto/Makefile | 2 ++
arch/x86/crypto/sha1-mb/Makefile | 2 ++
arch/x86/crypto/sha256-mb/Makefile | 2 ++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/acpi/Makefile | 2 ++
arch/x86/kernel/kprobes/opt.c | 9 ++++++++-
arch/x86/kernel/reboot.c | 2 ++
arch/x86/kvm/svm.c | 2 ++
arch/x86/kvm/vmx.c | 3 +++
arch/x86/lib/msr-reg.S | 8 ++++----
arch/x86/net/Makefile | 2 ++
arch/x86/platform/efi/Makefile | 1 +
arch/x86/power/Makefile | 2 ++
arch/x86/xen/Makefile | 3 +++
kernel/kexec_core.c | 4 +++-
15 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index 34b3fa2889d1..9e32d40d71bd 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#

+OBJECT_FILES_NON_STANDARD := y
+
avx_supported := $(call as-instr,vpxor %xmm0$(comma)%xmm0$(comma)%xmm0,yes,no)
avx2_supported := $(call as-instr,vpgatherdd %ymm0$(comma)(%eax$(comma)%ymm1\
$(comma)4)$(comma)%ymm2,yes,no)
diff --git a/arch/x86/crypto/sha1-mb/Makefile b/arch/x86/crypto/sha1-mb/Makefile
index 2f8756375df5..2e14acc3da25 100644
--- a/arch/x86/crypto/sha1-mb/Makefile
+++ b/arch/x86/crypto/sha1-mb/Makefile
@@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#

+OBJECT_FILES_NON_STANDARD := y
+
avx2_supported := $(call as-instr,vpgatherdd %ymm0$(comma)(%eax$(comma)%ymm1\
$(comma)4)$(comma)%ymm2,yes,no)
ifeq ($(avx2_supported),yes)
diff --git a/arch/x86/crypto/sha256-mb/Makefile b/arch/x86/crypto/sha256-mb/Makefile
index 41089e7c400c..45b4fca6c4a8 100644
--- a/arch/x86/crypto/sha256-mb/Makefile
+++ b/arch/x86/crypto/sha256-mb/Makefile
@@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#

+OBJECT_FILES_NON_STANDARD := y
+
avx2_supported := $(call as-instr,vpgatherdd %ymm0$(comma)(%eax$(comma)%ymm1\
$(comma)4)$(comma)%ymm2,yes,no)
ifeq ($(avx2_supported),yes)
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 79076d75bdbf..4c9c61517613 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -29,6 +29,7 @@ OBJECT_FILES_NON_STANDARD_head_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_mcount_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_test_nx.o := y
+OBJECT_FILES_NON_STANDARD_paravirt_patch_$(BITS).o := y

# If instrumentation of this dir is enabled, boot hangs during first second.
# Probably could be more selective here, but note that files related to irqs,
diff --git a/arch/x86/kernel/acpi/Makefile b/arch/x86/kernel/acpi/Makefile
index 26b78d86f25a..85a9e17e0dbc 100644
--- a/arch/x86/kernel/acpi/Makefile
+++ b/arch/x86/kernel/acpi/Makefile
@@ -1,3 +1,5 @@
+OBJECT_FILES_NON_STANDARD_wakeup_$(BITS).o := y
+
obj-$(CONFIG_ACPI) += boot.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o
obj-$(CONFIG_ACPI_APEI) += apei.o
diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index fa671b90c374..1808a9cc7701 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -28,6 +28,7 @@
#include <linux/kdebug.h>
#include <linux/kallsyms.h>
#include <linux/ftrace.h>
+#include <linux/frame.h>

#include <asm/text-patching.h>
#include <asm/cacheflush.h>
@@ -91,6 +92,7 @@ static void synthesize_set_arg1(kprobe_opcode_t *addr, unsigned long val)
}

asm (
+ "optprobe_template_func:\n"
".global optprobe_template_entry\n"
"optprobe_template_entry:\n"
#ifdef CONFIG_X86_64
@@ -128,7 +130,12 @@ asm (
" popf\n"
#endif
".global optprobe_template_end\n"
- "optprobe_template_end:\n");
+ "optprobe_template_end:\n"
+ ".type optprobe_template_func, @function\n"
+ ".size optprobe_template_func, .-optprobe_template_func\n");
+
+void optprobe_template_func(void);
+STACK_FRAME_NON_STANDARD(optprobe_template_func);

#define TMPL_MOVE_IDX \
((long)&optprobe_template_val - (long)&optprobe_template_entry)
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 03f21dbfaa9d..4a12362a194a 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -9,6 +9,7 @@
#include <linux/sched.h>
#include <linux/tboot.h>
#include <linux/delay.h>
+#include <linux/frame.h>
#include <acpi/reboot.h>
#include <asm/io.h>
#include <asm/apic.h>
@@ -127,6 +128,7 @@ void __noreturn machine_real_restart(unsigned int type)
#ifdef CONFIG_APM_MODULE
EXPORT_SYMBOL(machine_real_restart);
#endif
+STACK_FRAME_NON_STANDARD(machine_real_restart);

/*
* Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a27f9e442ffc..c4cd1280ac3e 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -36,6 +36,7 @@
#include <linux/slab.h>
#include <linux/amd-iommu.h>
#include <linux/hashtable.h>
+#include <linux/frame.h>

#include <asm/apic.h>
#include <asm/perf_event.h>
@@ -5111,6 +5112,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)

mark_all_clean(svm->vmcb);
}
+STACK_FRAME_NON_STANDARD(svm_vcpu_run);

static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2827a9622d97..4a66a620fc17 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <linux/tboot.h>
#include <linux/hrtimer.h>
+#include <linux/frame.h>
#include <linux/nospec.h>
#include "kvm_cache_regs.h"
#include "x86.h"
@@ -8698,6 +8699,7 @@ static void vmx_handle_external_intr(struct kvm_vcpu *vcpu)
);
}
}
+STACK_FRAME_NON_STANDARD(vmx_handle_external_intr);

static bool vmx_has_emulated_msr(int index)
{
@@ -9138,6 +9140,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx_recover_nmi_blocking(vmx);
vmx_complete_interrupts(vmx);
}
+STACK_FRAME_NON_STANDARD(vmx_vcpu_run);

static void vmx_load_vmcs01(struct kvm_vcpu *vcpu)
{
diff --git a/arch/x86/lib/msr-reg.S b/arch/x86/lib/msr-reg.S
index c81556409bbb..10ffa7e8519f 100644
--- a/arch/x86/lib/msr-reg.S
+++ b/arch/x86/lib/msr-reg.S
@@ -13,14 +13,14 @@
.macro op_safe_regs op
ENTRY(\op\()_safe_regs)
pushq %rbx
- pushq %rbp
+ pushq %r12
movq %rdi, %r10 /* Save pointer */
xorl %r11d, %r11d /* Return value */
movl (%rdi), %eax
movl 4(%rdi), %ecx
movl 8(%rdi), %edx
movl 12(%rdi), %ebx
- movl 20(%rdi), %ebp
+ movl 20(%rdi), %r12d
movl 24(%rdi), %esi
movl 28(%rdi), %edi
1: \op
@@ -29,10 +29,10 @@ ENTRY(\op\()_safe_regs)
movl %ecx, 4(%r10)
movl %edx, 8(%r10)
movl %ebx, 12(%r10)
- movl %ebp, 20(%r10)
+ movl %r12d, 20(%r10)
movl %esi, 24(%r10)
movl %edi, 28(%r10)
- popq %rbp
+ popq %r12
popq %rbx
ret
3:
diff --git a/arch/x86/net/Makefile b/arch/x86/net/Makefile
index 90568c33ddb0..fefb4b619598 100644
--- a/arch/x86/net/Makefile
+++ b/arch/x86/net/Makefile
@@ -1,4 +1,6 @@
#
# Arch-specific network modules
#
+OBJECT_FILES_NON_STANDARD_bpf_jit.o += y
+
obj-$(CONFIG_BPF_JIT) += bpf_jit.o bpf_jit_comp.o
diff --git a/arch/x86/platform/efi/Makefile b/arch/x86/platform/efi/Makefile
index 066619b0700c..7a255022933e 100644
--- a/arch/x86/platform/efi/Makefile
+++ b/arch/x86/platform/efi/Makefile
@@ -1,4 +1,5 @@
OBJECT_FILES_NON_STANDARD_efi_thunk_$(BITS).o := y
+OBJECT_FILES_NON_STANDARD_efi_stub_$(BITS).o := y

obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o
diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile
index a6a198c33623..05041871ac90 100644
--- a/arch/x86/power/Makefile
+++ b/arch/x86/power/Makefile
@@ -1,3 +1,5 @@
+OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y
+
# __restore_processor_state() restores %gs after S3 resume and so should not
# itself be stack-protected
nostackp := $(call cc-option, -fno-stack-protector)
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index e47e52787d32..4a54059f42ba 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -1,3 +1,6 @@
+OBJECT_FILES_NON_STANDARD_xen-asm_$(BITS).o := y
+OBJECT_FILES_NON_STANDARD_xen-pvh.o := y
+
ifdef CONFIG_FUNCTION_TRACER
# Do not profile debug and lowlevel utilities
CFLAGS_REMOVE_spinlock.o = -pg
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 561675589511..f5ab72ebda11 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -38,6 +38,7 @@
#include <linux/syscore_ops.h>
#include <linux/compiler.h>
#include <linux/hugetlb.h>
+#include <linux/frame.h>

#include <asm/page.h>
#include <asm/sections.h>
@@ -878,7 +879,7 @@ int kexec_load_disabled;
* only when panic_cpu holds the current CPU number; this is the only CPU
* which processes crash_kexec routines.
*/
-void __crash_kexec(struct pt_regs *regs)
+void __noclone __crash_kexec(struct pt_regs *regs)
{
/* Take the kexec_mutex here to prevent sys_kexec_load
* running on one cpu from replacing the crash kernel
@@ -900,6 +901,7 @@ void __crash_kexec(struct pt_regs *regs)
mutex_unlock(&kexec_mutex);
}
}
+STACK_FRAME_NON_STANDARD(__crash_kexec);

void crash_kexec(struct pt_regs *regs)
{
--
2.17.1