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x86/alternative: Rename apply_ibt_endbr()

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The current name doesn't reflect what it does very well.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lkml.kernel.org/r/20230622144321.427441595%40infradead.org
This commit is contained in:
Peter Zijlstra 2023-06-22 15:36:50 +02:00
parent 0479a42d4c
commit be0fffa5ca
5 changed files with 10 additions and 7 deletions
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2
arch/um/kernel/um_arch.c
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@ -437,7 +437,7 @@ void __init arch_cpu_finalize_init(void)
os_check_bugs();
}
void apply_ibt_endbr(s32 *start, s32 *end)
void apply_seal_endbr(s32 *start, s32 *end)
{
}

2
arch/x86/include/asm/alternative.h
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@ -96,7 +96,7 @@ extern void alternative_instructions(void);
extern void apply_alternatives(struct alt_instr *start, struct alt_instr *end);
extern void apply_retpolines(s32 *start, s32 *end);
extern void apply_returns(s32 *start, s32 *end);
extern void apply_ibt_endbr(s32 *start, s32 *end);
extern void apply_seal_endbr(s32 *start, s32 *end);
extern void apply_fineibt(s32 *start_retpoline, s32 *end_retpoine,
s32 *start_cfi, s32 *end_cfi);

2
arch/x86/include/asm/ibt.h
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@ -34,7 +34,7 @@
/*
* Create a dummy function pointer reference to prevent objtool from marking
* the function as needing to be "sealed" (i.e. ENDBR converted to NOP by
* apply_ibt_endbr()).
* apply_seal_endbr()).
*/
#define IBT_NOSEAL(fname) \
".pushsection .discard.ibt_endbr_noseal\n\t" \

9
arch/x86/kernel/alternative.c
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@ -803,7 +803,7 @@ static void __init_or_module poison_endbr(void *addr, bool warn)
/*
* Generated by: objtool --ibt
*/
void __init_or_module noinline apply_ibt_endbr(s32 *start, s32 *end)
void __init_or_module noinline apply_seal_endbr(s32 *start, s32 *end)
{
s32 *s;
@ -818,7 +818,7 @@ void __init_or_module noinline apply_ibt_endbr(s32 *start, s32 *end)
#else
void __init_or_module apply_ibt_endbr(s32 *start, s32 *end) { }
void __init_or_module apply_seal_endbr(s32 *start, s32 *end) { }
#endif /* CONFIG_X86_KERNEL_IBT */
@ -1565,7 +1565,10 @@ void __init alternative_instructions(void)
*/
callthunks_patch_builtin_calls();
apply_ibt_endbr(__ibt_endbr_seal, __ibt_endbr_seal_end);
/*
* Seal all functions that do not have their address taken.
*/
apply_seal_endbr(__ibt_endbr_seal, __ibt_endbr_seal_end);
#ifdef CONFIG_SMP
/* Patch to UP if other cpus not imminent. */

2
arch/x86/kernel/module.c
View File

@ -358,7 +358,7 @@ int module_finalize(const Elf_Ehdr *hdr,
}
if (ibt_endbr) {
void *iseg = (void *)ibt_endbr->sh_addr;
apply_ibt_endbr(iseg, iseg + ibt_endbr->sh_size);
apply_seal_endbr(iseg, iseg + ibt_endbr->sh_size);
}
if (locks) {
void *lseg = (void *)locks->sh_addr;