The patch titled
Subject: arm64: ascii armor the arm64 boot init stack canary
has been added to the -mm tree. Its filename is
arm64-ascii-armor-the-arm64-boot-init-stack-canary.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-ascii-armor-the-arm64-boot-init-stack-canary.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-ascii-armor-the-arm64-boot-init-stack-canary.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Rik van Riel <riel@xxxxxxxxxx>
Subject: arm64: ascii armor the arm64 boot init stack canary
Use the ascii-armor canary to prevent unterminated C string overflows from
being able to successfully overwrite the canary, even if they somehow
obtain the canary value.
Inspired by execshield ascii-armor and Daniel Micay's linux-hardened tree.
Link: http://lkml.kernel.org/r/20170524155751.424-5-riel@xxxxxxxxxx
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Daniel Micay <danielmicay@xxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/stackprotector.h | 1 +
1 file changed, 1 insertion(+)
diff -puN arch/arm64/include/asm/stackprotector.h~arm64-ascii-armor-the-arm64-boot-init-stack-canary arch/arm64/include/asm/stackprotector.h
--- a/arch/arm64/include/asm/stackprotector.h~arm64-ascii-armor-the-arm64-boot-init-stack-canary
+++ a/arch/arm64/include/asm/stackprotector.h
@@ -30,6 +30,7 @@ static __always_inline void boot_init_st
/* Try to get a semi random initial value. */
get_random_bytes(&canary, sizeof(canary));
canary ^= LINUX_VERSION_CODE;
+ canary &= CANARY_MASK;
current->stack_canary = canary;
__stack_chk_guard = current->stack_canary;
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
randomstackprotect-introduce-get_random_canary-function.patch
forkrandom-use-get_random_canary-to-set-tsk-stack_canary.patch
x86-ascii-armor-the-x86_64-boot-init-stack-canary.patch
arm64-ascii-armor-the-arm64-boot-init-stack-canary.patch
sh64-ascii-armor-the-sh64-boot-init-stack-canary.patch
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