selftests: coredump: Add stackdump test

Add a test which checks that the kstkesp field in /proc/pid/stat can be
read for all threads of a coredumping process.

For full details including the motivation for this test and how it works,
see the README file added by this commit.

Reviewed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Link: https://lore.kernel.org/r/50e737b6576208566d14efcf1934fe840de6b1f4.1735805772.git.namcao@linutronix.de
Signed-off-by: Christian Brauner <brauner@kernel.org>

tools/testing/selftests/coredump/stackdump_test.c

@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <fcntl.h>
+#include <libgen.h>
+#include <linux/limits.h>
+#include <pthread.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <unistd.h>
+
+#include "../kselftest_harness.h"
+
+#define STACKDUMP_FILE "stack_values"
+#define STACKDUMP_SCRIPT "stackdump"
+#define NUM_THREAD_SPAWN 128
+
+static void *do_nothing(void *)
+{
+	while (1)
+		pause();
+}
+
+static void crashing_child(void)
+{
+	pthread_t thread;
+	int i;
+
+	for (i = 0; i < NUM_THREAD_SPAWN; ++i)
+		pthread_create(&thread, NULL, do_nothing, NULL);
+
+	/* crash on purpose */
+	i = *(int *)NULL;
+}
+
+FIXTURE(coredump)
+{
+	char original_core_pattern[256];
+};
+
+FIXTURE_SETUP(coredump)
+{
+	char buf[PATH_MAX];
+	FILE *file;
+	char *dir;
+	int ret;
+
+	file = fopen("/proc/sys/kernel/core_pattern", "r");
+	ASSERT_NE(NULL, file);
+
+	ret = fread(self->original_core_pattern, 1, sizeof(self->original_core_pattern), file);
+	ASSERT_TRUE(ret || feof(file));
+	ASSERT_LT(ret, sizeof(self->original_core_pattern));
+
+	self->original_core_pattern[ret] = '\0';
+
+	ret = fclose(file);
+	ASSERT_EQ(0, ret);
+}
+
+FIXTURE_TEARDOWN(coredump)
+{
+	const char *reason;
+	FILE *file;
+	int ret;
+
+	unlink(STACKDUMP_FILE);
+
+	file = fopen("/proc/sys/kernel/core_pattern", "w");
+	if (!file) {
+		reason = "Unable to open core_pattern";
+		goto fail;
+	}
+
+	ret = fprintf(file, "%s", self->original_core_pattern);
+	if (ret < 0) {
+		reason = "Unable to write to core_pattern";
+		goto fail;
+	}
+
+	ret = fclose(file);
+	if (ret) {
+		reason = "Unable to close core_pattern";
+		goto fail;
+	}
+
+	return;
+fail:
+	/* This should never happen */
+	fprintf(stderr, "Failed to cleanup stackdump test: %s\n", reason);
+}
+
+TEST_F(coredump, stackdump)
+{
+	struct sigaction action = {};
+	unsigned long long stack;
+	char *test_dir, *line;
+	size_t line_length;
+	char buf[PATH_MAX];
+	int ret, i;
+	FILE *file;
+	pid_t pid;
+
+	/*
+	 * Step 1: Setup core_pattern so that the stackdump script is executed when the child
+	 * process crashes
+	 */
+	ret = readlink("/proc/self/exe", buf, sizeof(buf));
+	ASSERT_NE(-1, ret);
+	ASSERT_LT(ret, sizeof(buf));
+	buf[ret] = '\0';
+
+	test_dir = dirname(buf);
+
+	file = fopen("/proc/sys/kernel/core_pattern", "w");
+	ASSERT_NE(NULL, file);
+
+	ret = fprintf(file, "|%1$s/%2$s %%P %1$s/%3$s", test_dir, STACKDUMP_SCRIPT, STACKDUMP_FILE);
+	ASSERT_LT(0, ret);
+
+	ret = fclose(file);
+	ASSERT_EQ(0, ret);
+
+	/* Step 2: Create a process who spawns some threads then crashes */
+	pid = fork();
+	ASSERT_TRUE(pid >= 0);
+	if (pid == 0)
+		crashing_child();
+
+	/*
+	 * Step 3: Wait for the stackdump script to write the stack pointers to the stackdump file
+	 */
+	for (i = 0; i < 10; ++i) {
+		file = fopen(STACKDUMP_FILE, "r");
+		if (file)
+			break;
+		sleep(1);
+	}
+	ASSERT_NE(file, NULL);
+
+	/* Step 4: Make sure all stack pointer values are non-zero */
+	for (i = 0; -1 != getline(&line, &line_length, file); ++i) {
+		stack = strtoull(line, NULL, 10);
+		ASSERT_NE(stack, 0);
+	}
+
+	ASSERT_EQ(i, 1 + NUM_THREAD_SPAWN);
+
+	fclose(file);
+}
+
+TEST_HARNESS_MAIN