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[tip,2/2] signal, perf: Add missing TRAP_PERF case in siginfo_layout()

Message ID 20210422064437.3577327-2-elver@google.com (mailing list archive)
State New
Headers show
Series [tip,1/2] signal, perf: Fix siginfo_t by avoiding u64 on 32-bit architectures | expand

Commit Message

Marco Elver April 22, 2021, 6:44 a.m. UTC
Add the missing TRAP_PERF case in siginfo_layout() for interpreting the
layout correctly as SIL_PERF_EVENT instead of just SIL_FAULT. This
ensures the si_perf field is copied and not just the si_addr field.

This was caught and tested by running the perf_events/sigtrap_threads
kselftest as a 32-bit binary with a 64-bit kernel.

Fixes: fb6cc127e0b6 ("signal: Introduce TRAP_PERF si_code and si_perf to siginfo")
Signed-off-by: Marco Elver <elver@google.com>
 kernel/signal.c | 2 ++
 1 file changed, 2 insertions(+)
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diff --git a/kernel/signal.c b/kernel/signal.c
index 9ed81ee4ff17..b354655a0e57 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3251,6 +3251,8 @@  enum siginfo_layout siginfo_layout(unsigned sig, int si_code)
 			else if ((sig == SIGSEGV) && (si_code == SEGV_PKUERR))
 				layout = SIL_FAULT_PKUERR;
+			else if ((sig == SIGTRAP) && (si_code == TRAP_PERF))
+				layout = SIL_PERF_EVENT;
 		else if (si_code <= NSIGPOLL)
 			layout = SIL_POLL;