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arm64: always enable DEBUG_RODATA and remove the Kconfig option
Follow the example set by x86 in commit 9ccaf77cf0
("x86/mm:
Always enable CONFIG_DEBUG_RODATA and remove the Kconfig option"), and
make these protections a fundamental security feature rather than an
opt-in. This also results in a minor code simplification.
For those rare cases when users wish to disable this protection (e.g.
for debugging), this can be done by passing 'rodata=off' on the command
line.
As DEBUG_RODATA_ALIGN is only intended to address a performance/memory
tradeoff, and does not affect correctness, this is left user-selectable.
DEBUG_MODULE_RONX is also left user-selectable until the core code
provides a boot-time option to disable the protection for debugging
use-cases.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
parent
e7cd190385
commit
40982fd6b9
3 changed files with 4 additions and 11 deletions
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@ -122,6 +122,9 @@ config ARCH_PHYS_ADDR_T_64BIT
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config MMU
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def_bool y
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config DEBUG_RODATA
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def_bool y
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config ARM64_PAGE_SHIFT
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int
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default 16 if ARM64_64K_PAGES
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@ -49,16 +49,6 @@ config DEBUG_SET_MODULE_RONX
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If in doubt, say Y.
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config DEBUG_RODATA
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bool "Make kernel text and rodata read-only"
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default y
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help
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If this is set, kernel text and rodata will be made read-only. This
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is to help catch accidental or malicious attempts to change the
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kernel's executable code.
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If in doubt, say Y.
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config DEBUG_ALIGN_RODATA
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depends on DEBUG_RODATA
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bool "Align linker sections up to SECTION_SIZE"
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@ -96,7 +96,7 @@ static void __kprobes *patch_map(void *addr, int fixmap)
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if (module && IS_ENABLED(CONFIG_DEBUG_SET_MODULE_RONX))
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page = vmalloc_to_page(addr);
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else if (!module && IS_ENABLED(CONFIG_DEBUG_RODATA))
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else if (!module)
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page = pfn_to_page(PHYS_PFN(__pa(addr)));
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else
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return addr;
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