linux-kernel - [PATCH RFC v2 6/6] selftests/coredump: add tests for AF

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Message-Id: <20250502-work-coredump-socket-v2-6-43259042ffc7@kernel.org>
Date: Fri, 02 May 2025 14:42:37 +0200
From: Christian Brauner <brauner@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, 
 Kuniyuki Iwashima <kuniyu@...zon.com>, Oleg Nesterov <oleg@...hat.com>, 
 linux-fsdevel@...r.kernel.org, Jann Horn <jannh@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, 
 Alexander Viro <viro@...iv.linux.org.uk>, 
 Daan De Meyer <daan.j.demeyer@...il.com>, 
 David Rheinsberg <david@...dahead.eu>, Jakub Kicinski <kuba@...nel.org>, 
 Jan Kara <jack@...e.cz>, Lennart Poettering <lennart@...ttering.net>, 
 Luca Boccassi <bluca@...ian.org>, Mike Yuan <me@...dnzj.com>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 Christian Brauner <brauner@...nel.org>
Subject: [PATCH RFC v2 6/6] selftests/coredump: add tests for AF_UNIX
 coredumps

Add a simple test for generating coredumps via AF_UNIX sockets.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 tools/testing/selftests/coredump/stackdump_test.c | 50 +++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/tools/testing/selftests/coredump/stackdump_test.c b/tools/testing/selftests/coredump/stackdump_test.c
index fe3c728cd6be..ccaee98dbee3 100644
--- a/tools/testing/selftests/coredump/stackdump_test.c
+++ b/tools/testing/selftests/coredump/stackdump_test.c
@@ -5,7 +5,9 @@
 #include <linux/limits.h>
 #include <pthread.h>
 #include <string.h>
+#include <sys/mount.h>
 #include <sys/resource.h>
+#include <sys/stat.h>
 #include <unistd.h>

 #include "../kselftest_harness.h"
@@ -154,4 +156,52 @@ TEST_F_TIMEOUT(coredump, stackdump, 120)
 	fclose(file);
 }

+TEST_F(coredump, socket)
+{
+	int fd, ret, status;
+	FILE *file;
+	pid_t pid, pid_socat;
+	struct stat st;
+	char core_file[PATH_MAX];
+
+	ASSERT_EQ(unshare(CLONE_NEWNS), 0);
+	ASSERT_EQ(mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL), 0);
+	ASSERT_EQ(mount(NULL, "/tmp", "tmpfs", 0, NULL), 0);
+
+	pid_socat = fork();
+	ASSERT_GE(pid_socat, 0);
+	if (pid_socat == 0) {
+		execlp("socat", "socat",
+		       "unix-listen:/tmp/coredump.socket,fork",
+		       "FILE:/tmp/coredump_file,create,append,trunc",
+		       (char *)NULL);
+		_exit(EXIT_FAILURE);
+	}
+
+	file = fopen("/proc/sys/kernel/core_pattern", "w");
+	ASSERT_NE(NULL, file);
+
+	ret = fprintf(file, ":/tmp/coredump.socket");
+	ASSERT_EQ(ret, strlen(":/tmp/coredump.socket"));
+	ASSERT_EQ(fclose(file), 0);
+
+	pid = fork();
+	ASSERT_GE(pid, 0);
+	if (pid == 0)
+		crashing_child();
+
+	waitpid(pid, &status, 0);
+	ASSERT_TRUE(WIFSIGNALED(status));
+	ASSERT_TRUE(WCOREDUMP(status));
+
+	ASSERT_EQ(kill(pid_socat, SIGTERM), 0);
+	waitpid(pid_socat, &status, 0);
+	ASSERT_TRUE(WIFEXITED(status));
+	ASSERT_EQ(WEXITSTATUS(status), 143);
+
+	/* We should somehow validate the produced core file. */
+	ASSERT_EQ(stat("/tmp/coredump_file", &st), 0);
+	ASSERT_GT(st.st_size, 0);
+}
+
 TEST_HARNESS_MAIN

-- 
2.47.2