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arm64: Mark __stack_chk_guard as __ro_after_init

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[ Upstream commit 9fcb2e93f4 ]

__stack_chk_guard is setup once while init stage and never changed
after that.

Although the modification of this variable at runtime will usually
cause the kernel to crash (so does the attacker), it should be marked
as __ro_after_init, and it should not affect performance if it is
placed in the ro_after_init section.

Signed-off-by: Dan Li <ashimida@linux.alibaba.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/1631612642-102881-1-git-send-email-ashimida@linux.alibaba.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Li
2021-09-14 17:44:02 +08:00
committed by Greg Kroah-Hartman
parent 28f2eee9fc
commit 95d6bf1d19
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/process.c
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@@ -60,7 +60,7 @@
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK) #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
#include <linux/stackprotector.h> #include <linux/stackprotector.h>
unsigned long __stack_chk_guard __read_mostly; unsigned long __stack_chk_guard __ro_after_init;
EXPORT_SYMBOL(__stack_chk_guard); EXPORT_SYMBOL(__stack_chk_guard);
#endif #endif