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x86,static_call: Fix static-call vs return-thunk

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  7825451fa4 ("static_call: Add call depth tracking support")

failed to realize the problem fixed there is not specific to call depth
tracking but applies to all return-thunk uses.

Move the fix to the appropriate place and condition.

Fixes: ee88d363d1 ("x86,static_call: Use alternative RET encoding")
Reported-by: David Kaplan <David.Kaplan@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
This commit is contained in:
Peter Zijlstra 2023-09-22 10:12:25 +00:00 • committed by Borislav Petkov (AMD)
parent 4ba89dd6dd
commit aee9d30b97
2 changed files with 3 additions and 1 deletions
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3
arch/x86/kernel/alternative.c
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@ -720,6 +720,9 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end)
{
s32 *s;
if (cpu_feature_enabled(X86_FEATURE_RETHUNK))
static_call_force_reinit();
for (s = start; s < end; s++) {
void *dest = NULL, *addr = (void *)s + *s;
struct insn insn;

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);
}