linux-kernel - [PATCH] perf/bench/seccomp-notify: don't use assert to check syscall errors

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Message-Id: <20230630051953.454638-1-avagin@gmail.com>
Date:   Thu, 29 Jun 2023 22:19:53 -0700
From:   Andrei Vagin <avagin@...il.com>
To:     linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Cc:     Andrei Vagin <avagin@...il.com>
Subject: [PATCH] perf/bench/seccomp-notify: don't use assert to check syscall errors

Since 616b14b47a86, perf is built with NDEBUG=1 so the macro
assert() is nop.

Signed-off-by: Andrei Vagin <avagin@...il.com>
---
 tools/perf/bench/sched-seccomp-notify.c | 35 +++++++++++++++----------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/tools/perf/bench/sched-seccomp-notify.c b/tools/perf/bench/sched-seccomp-notify.c
index eac4ef60090f..73ab86269427 100644
--- a/tools/perf/bench/sched-seccomp-notify.c
+++ b/tools/perf/bench/sched-seccomp-notify.c
@@ -22,9 +22,7 @@
 #include <sys/wait.h>
 #include <string.h>
 #include <errno.h>
-/* keep all assert() calls. */
-#undef NDEBUG
-#include <assert.h>
+#include <err.h>
 
 #define LOOPS_DEFAULT 1000000UL
 static uint64_t loops = LOOPS_DEFAULT;
@@ -74,15 +72,18 @@ static void user_notification_sync_loop(int listener)
 
 	for (nr = 0; nr < loops; nr++) {
 		memset(&req, 0, sizeof(req));
-		assert(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req) == 0);
+		if (ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req))
+			err(EXIT_FAILURE, "SECCOMP_IOCTL_NOTIF_RECV failed");
 
-		assert(req.data.nr == __NR_gettid);
+		if (req.data.nr != __NR_gettid)
+			errx(EXIT_FAILURE, "unexpected syscall: %d", req.data.nr);
 
 		resp.id = req.id;
 		resp.error = 0;
 		resp.val = USER_NOTIF_MAGIC;
 		resp.flags = 0;
-		assert(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp) == 0);
+		if (ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp))
+			err(EXIT_FAILURE, "SECCOMP_IOCTL_NOTIF_SEND failed");
 	}
 }
 
@@ -105,12 +106,15 @@ int bench_sched_seccomp_notify(int argc, const char **argv)
 	prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
 	listener = user_notif_syscall(__NR_gettid,
 				      SECCOMP_FILTER_FLAG_NEW_LISTENER);
-	assert(listener >= 0);
+	if (listener < 0)
+		err(EXIT_FAILURE, "can't create a notification descriptor");
 
 	pid = fork();
-	assert(pid >= 0);
+	if (pid < 0)
+		err(EXIT_FAILURE, "fork");
 	if (pid == 0) {
-		assert(prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0) == 0);
+		if (prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0))
+			err(EXIT_FAILURE, "can't set the parent death signal");
 		while (1) {
 			ret = syscall(__NR_gettid);
 			if (ret == USER_NOTIF_MAGIC)
@@ -121,15 +125,18 @@ int bench_sched_seccomp_notify(int argc, const char **argv)
 	}
 
 	if (sync_mode) {
-		assert(ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS,
-			     SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP, 0) == 0);
+		if (ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS,
+			     SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP, 0))
+			err(EXIT_FAILURE,
+			    "can't set SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP");
 	}
 	user_notification_sync_loop(listener);
 
 	kill(pid, SIGKILL);
-	assert(waitpid(pid, &status, 0) == pid);
-	assert(WIFSIGNALED(status));
-	assert(WTERMSIG(status) == SIGKILL);
+	if (waitpid(pid, &status, 0) != pid)
+		err(EXIT_FAILURE, "waitpid(%d) failed", pid);
+	if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGKILL)
+		errx(EXIT_FAILURE, "unexpected exit code: %d", status);
 
 	gettimeofday(&stop, NULL);
 	timersub(&stop, &start, &diff);
-- 
2.40.1