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x86/alternative: Report missing return thunk details 

commit 65cdf0d623 upstream.

Debugging missing return thunks is easier if we can see where they're
happening.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/lkml/Ys66hwtFcGbYmoiZ@hirez.programming.kicks-ass.net/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2022-07-13 14:38:19 -07:00 committed by Greg Kroah-Hartman
parent 4a15f0d680
commit 67e4459d4c
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kernel/alternative.c
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@ -555,7 +555,9 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end)
dest = addr + insn.length + insn.immediate.value;
if (__static_call_fixup(addr, op, dest) ||
WARN_ON_ONCE(dest != &__x86_return_thunk))
WARN_ONCE(dest != &__x86_return_thunk,
"missing return thunk: %pS-%pS: %*ph",
addr, dest, 5, addr))
continue;
DPRINTK("return thunk at: %pS (%px) len: %d to: %pS",