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Fix the patching ordering between static calls and return thunks.

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Merge tag 'x86_urgent_for_v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 rethunk fixes from Borislav Petkov:
 "Fix the patching ordering between static calls and return thunks"

* tag 'x86_urgent_for_v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86,static_call: Fix static-call vs return-thunk
  x86/alternatives: Remove faulty optimization
This commit is contained in:
Linus Torvalds 2023-09-22 12:35:56 -07:00
commit b61ec8d0f1
2 changed files with 2 additions and 8 deletions
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9
arch/x86/kernel/alternative.c
View file

@ -720,13 +720,8 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end)
{
s32 *s;
/*
* Do not patch out the default return thunks if those needed are the
* ones generated by the compiler.
*/
if (cpu_feature_enabled(X86_FEATURE_RETHUNK) &&
(x86_return_thunk == __x86_return_thunk))
return;
if (cpu_feature_enabled(X86_FEATURE_RETHUNK))
static_call_force_reinit();
for (s = start; s < end; s++) {
void *dest = NULL, *addr = (void *)s + *s;

1
arch/x86/kernel/callthunks.c
View file

@ -272,7 +272,6 @@ void __init callthunks_patch_builtin_calls(void)
pr_info("Setting up call depth tracking\n");
mutex_lock(&text_mutex);
callthunks_setup(&cs, &builtin_coretext);
static_call_force_reinit();
thunks_initialized = true;
mutex_unlock(&text_mutex);
}