From: Ard Biesheuvel <ardb@google.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Ard Biesheuvel <ardb@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Ryan Roberts <ryan.roberts@arm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Kees Cook <keescook@chromium.org>
Subject: [PATCH v6 29/41] arm64: idreg-override: Create a pseudo feature for rodata=off
Date: Wed, 29 Nov 2023 12:16:25 +0100 [thread overview]
Message-ID: <20231129111555.3594833-72-ardb@google.com> (raw)
In-Reply-To: <20231129111555.3594833-43-ardb@google.com>
From: Ard Biesheuvel <ardb@kernel.org>
Add rodata=off to the set of kernel command line options that is parsed
early using the CPU feature override detection code, so we can easily
refer to it when creating the kernel mapping.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm64/include/asm/cpufeature.h | 1 +
arch/arm64/kernel/pi/idreg-override.c | 2 ++
2 files changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 9e8c3e345951..5e71d5ebe918 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -17,6 +17,7 @@
#define ARM64_SW_FEATURE_OVERRIDE_NOKASLR 0
#define ARM64_SW_FEATURE_OVERRIDE_HVHE 4
+#define ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF 8
#ifndef __ASSEMBLY__
diff --git a/arch/arm64/kernel/pi/idreg-override.c b/arch/arm64/kernel/pi/idreg-override.c
index f9e05c10faab..e4bcabcc6860 100644
--- a/arch/arm64/kernel/pi/idreg-override.c
+++ b/arch/arm64/kernel/pi/idreg-override.c
@@ -159,6 +159,7 @@ static const struct ftr_set_desc sw_features __prel64_initconst = {
.fields = {
FIELD("nokaslr", ARM64_SW_FEATURE_OVERRIDE_NOKASLR, NULL),
FIELD("hvhe", ARM64_SW_FEATURE_OVERRIDE_HVHE, hvhe_filter),
+ FIELD("rodataoff", ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF, NULL),
{}
},
};
@@ -190,6 +191,7 @@ static const struct {
{ "arm64.nomops", "id_aa64isar2.mops=0" },
{ "arm64.nomte", "id_aa64pfr1.mte=0" },
{ "nokaslr", "arm64_sw.nokaslr=1" },
+ { "rodata=off", "arm64_sw.rodataoff=1" },
};
static int __init parse_hexdigit(const char *p, u64 *v)
--
2.43.0.rc1.413.gea7ed67945-goog
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next prev parent reply other threads:[~2023-11-29 12:31 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-29 11:15 [PATCH v6 00/41] arm64: Reorganize kernel VA space for LPA2 Ard Biesheuvel
2023-11-29 11:15 ` [PATCH v6 01/41] arm64: kernel: Disable latent_entropy GCC plugin in early C runtime Ard Biesheuvel
2023-11-30 4:44 ` Anshuman Khandual
2023-11-29 11:15 ` [PATCH v6 02/41] arm64: mm: Take potential load offset into account when KASLR is off Ard Biesheuvel
2023-11-30 5:23 ` Anshuman Khandual
2023-12-04 14:12 ` Mark Rutland
2023-12-04 15:40 ` Ard Biesheuvel
2023-11-29 11:15 ` [PATCH v6 03/41] arm64: mm: get rid of kimage_vaddr global variable Ard Biesheuvel
2023-11-30 5:38 ` Anshuman Khandual
2023-12-04 14:37 ` Mark Rutland
2023-12-05 2:26 ` Anshuman Khandual
2023-11-29 11:16 ` [PATCH v6 04/41] arm64: mm: Move PCI I/O emulation region above the vmemmap region Ard Biesheuvel
2023-11-30 7:59 ` Anshuman Khandual
2023-11-30 8:02 ` Ard Biesheuvel
2023-11-30 8:52 ` Anshuman Khandual
2023-11-30 8:56 ` Ard Biesheuvel
2023-12-11 13:57 ` Mark Rutland
2023-12-11 14:10 ` Ard Biesheuvel
2023-12-11 14:21 ` Mark Rutland
2023-11-29 11:16 ` [PATCH v6 05/41] arm64: mm: Move fixmap region above " Ard Biesheuvel
2023-12-11 14:23 ` Mark Rutland
2023-11-29 11:16 ` [PATCH v6 06/41] arm64: ptdump: Allow all region boundaries to be defined at boot time Ard Biesheuvel
2023-12-11 14:15 ` Mark Rutland
2023-11-29 11:16 ` [PATCH v6 07/41] arm64: ptdump: Discover start of vmemmap region at runtime Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 08/41] arm64: vmemmap: Avoid base2 order of struct page size to dimension region Ard Biesheuvel
2023-12-11 14:35 ` Mark Rutland
2023-12-12 21:34 ` Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 09/41] arm64: mm: Reclaim unused vmemmap region for vmalloc use Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 10/41] arm64: kaslr: Adjust randomization range dynamically Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 11/41] arm64: kernel: Manage absolute relocations in code built under pi/ Ard Biesheuvel
2023-11-29 12:27 ` Marc Zyngier
2023-11-29 12:46 ` Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 12/41] arm64: kernel: Don't rely on objcopy to make code under pi/ __init Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 13/41] arm64: head: move relocation handling to C code Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 14/41] arm64: idreg-override: Omit non-NULL checks for override pointer Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 15/41] arm64: idreg-override: Prepare for place relative reloc patching Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 16/41] arm64: idreg-override: Avoid parameq() and parameqn() Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 17/41] arm64: idreg-override: avoid strlen() to check for empty strings Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 18/41] arm64: idreg-override: Avoid sprintf() for simple string concatenation Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 19/41] arm64: idreg-override: Avoid kstrtou64() to parse a single hex digit Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 20/41] arm64/kernel: Move 'nokaslr' parsing out of early idreg code Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 21/41] arm64: idreg-override: Move to early mini C runtime Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 22/41] arm64: kernel: Remove early fdt remap code Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 23/41] arm64: head: Clear BSS and the kernel page tables in one go Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 24/41] arm64: Move feature overrides into the BSS section Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 25/41] arm64: head: Run feature override detection before mapping the kernel Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 26/41] arm64: head: move dynamic shadow call stack patching into early C runtime Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 27/41] arm64: cpufeature: Add helper to test for CPU feature overrides Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 28/41] arm64: kaslr: Use feature override instead of parsing the cmdline again Ard Biesheuvel
2023-11-29 11:16 ` Ard Biesheuvel [this message]
2023-11-29 11:16 ` [PATCH v6 30/41] arm64: Add helpers to probe local CPU for PAC and BTI support Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 31/41] arm64: head: allocate more pages for the kernel mapping Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 32/41] arm64: head: move memstart_offset_seed handling to C code Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 33/41] arm64: mm: Make kaslr_requires_kpti() a static inline Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 34/41] arm64: mmu: Make __cpu_replace_ttbr1() out of line Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 35/41] arm64: head: Move early kernel mapping routines into C code Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 36/41] arm64: mm: Use 48-bit virtual addressing for the permanent ID map Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 37/41] arm64: pgtable: Decouple PGDIR size macros from PGD/PUD/PMD levels Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 38/41] arm64: kernel: Create initial ID map from C code Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 39/41] arm64: mm: avoid fixmap for early swapper_pg_dir updates Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 40/41] arm64: mm: omit redundant remap of kernel image Ard Biesheuvel
2023-11-29 11:16 ` [PATCH v6 41/41] arm64: Revert "mm: provide idmap pointer to cpu_replace_ttbr1()" Ard Biesheuvel
2023-12-12 17:20 ` [PATCH v6 00/41] arm64: Reorganize kernel VA space for LPA2 Will Deacon
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