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ANDROID: x86/alternatives: Use C int3 selftest but disable KASAN

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Instead of using inline asm for the int3 selftest (which confuses the
Clang's ThinLTO pass), this restores the C function but disables KASAN
(and tracing for good measure) to keep the things simple and avoid
unexpected side-effects. This attempts to keep the fix from commit
ecc6061038 ("x86/alternatives: Fix int3_emulate_call() selftest stack
corruption") without using inline asm.

Bug: 145297900
Change-Id: I2b6e237d89968b677c34e162b71a520ed8375e2d
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Kees Cook
2019-10-16 15:56:01 -07:00
committed by Sami Tolvanen
parent f436f8ad8f
commit 775b28a2e0
1 changed files with 4 additions and 17 deletions
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21
arch/x86/kernel/alternative.c
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@@ -625,23 +625,10 @@ extern struct paravirt_patch_site __start_parainstructions[],
*
* See entry_{32,64}.S for more details.
*/
/*
* We define the int3_magic() function in assembly to control the calling
* convention such that we can 'call' it from assembly.
*/
extern void int3_magic(unsigned int *ptr); /* defined in asm */
asm (
" .pushsection .init.text, \"ax\", @progbits\n"
" .type int3_magic, @function\n"
"int3_magic:\n"
" movl $1, (%" _ASM_ARG1 ")\n"
" ret\n"
" .size int3_magic, .-int3_magic\n"
" .popsection\n"
);
static void __init __no_sanitize_address notrace int3_magic(unsigned int *ptr)
{
*ptr = 1;
}
extern __initdata unsigned long int3_selftest_ip; /* defined in asm below */