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| author |   Kees Cook <keescook@chromium.org> | 2022-07-13 14:38:19 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-07-20 19:24:53 +0200 |
| commit | 65cdf0d623bedf0e069bb64ed52e8bb20105e2ba (patch) | |
| tree | 295ac06112e8b8e1358d313dd5eddf6bfa55aaec | |
| parent | virt: sev-guest: Pass the appropriate argument type to iounmap() (diff) | |
| download | linux-dev-65cdf0d623bedf0e069bb64ed52e8bb20105e2ba.tar.xz linux-dev-65cdf0d623bedf0e069bb64ed52e8bb20105e2ba.zip | |
x86/alternative: Report missing return thunk details
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/
| -rw-r--r-- | arch/x86/kernel/alternative.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index d6858533e6e5..62f6b8b7c4a5 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -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", |