[PATCH] selftests/seccomp/seccomp_bpf: update for PTRACE_GET_SYSCALL_INFO

["Dmitry V. Levin" <ldv@altlinux.org>]

The syscall entry/exit is now exposed via PTRACE_GETEVENTMSG,
update the test accordingly.

Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
---
 tools/testing/selftests/seccomp/seccomp_bpf.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index dc66fe852768..6ef7f16c4cf5 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1775,13 +1775,18 @@ void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
 	unsigned long msg;
 	static bool entry;
 
-	/* Make sure we got an empty message. */
+	/*
+	 * The traditional way to tell PTRACE_SYSCALL entry/exit
+	 * is by counting.
+	 */
+	entry = !entry;
+
+	/* Make sure we got an appropriate message. */
 	ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
 	EXPECT_EQ(0, ret);
-	EXPECT_EQ(0, msg);
+	EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
+			: PTRACE_EVENTMSG_SYSCALL_EXIT, msg);
 
-	/* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
-	entry = !entry;
 	if (!entry)
 		return;
 
-- 
ldv