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authorndesaulniers@google.com <ndesaulniers@google.com>2023-04-18 01:00:05 +0300
committerJosh Poimboeuf <jpoimboe@kernel.org>2023-05-16 16:28:15 +0300
commit514ca14ed5444b911de59ed3381dfd195d99fe4b (patch)
tree26610404230c6735d8439ff4c8fa18f38e25406b /init
parent95f0e3a209b0045a56a06987d85981280f523270 (diff)
downloadlinux-514ca14ed5444b911de59ed3381dfd195d99fe4b.tar.xz
start_kernel: Add __no_stack_protector function attribute
Back during the discussion of commit a9a3ed1eff36 ("x86: Fix early boot crash on gcc-10, third try") we discussed the need for a function attribute to control the omission of stack protectors on a per-function basis; at the time Clang had support for no_stack_protector but GCC did not. This was fixed in gcc-11. Now that the function attribute is available, let's start using it. Callers of boot_init_stack_canary need to use this function attribute unless they're compiled with -fno-stack-protector, otherwise the canary stored in the stack slot of the caller will differ upon the call to boot_init_stack_canary. This will lead to a call to __stack_chk_fail() then panic. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94722 Link: https://lore.kernel.org/all/20200316130414.GC12561@hirez.programming.kicks-ass.net/ Tested-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Miguel Ojeda <ojeda@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20230412-no_stackp-v2-1-116f9fe4bbe7@google.com Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: ndesaulniers@google.com <ndesaulniers@google.com>
Diffstat (limited to 'init')
-rw-r--r--init/main.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/init/main.c b/init/main.c
index af50044deed5..c445c1fb19b9 100644
--- a/init/main.c
+++ b/init/main.c
@@ -877,7 +877,8 @@ static void __init print_unknown_bootoptions(void)
memblock_free(unknown_options, len);
}
-asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(void)
+asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector
+void start_kernel(void)
{
char *command_line;
char *after_dashes;