[LTP] [PATCH 2/3] Add process_mrelease01 test

[Andrea Cervesato <andrea.cervesato@suse.de>]

From: Andrea Cervesato <andrea.cervesato@suse.com>

This test verifies that process_mrelease() syscall is releasing memory
from a killed process with memory allocation pending.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                   |   2 +
 .../kernel/syscalls/process_mrelease/.gitignore    |   1 +
 .../kernel/syscalls/process_mrelease/Makefile      |   7 ++
 .../syscalls/process_mrelease/process_mrelease01.c | 118 +++++++++++++++++++++
 4 files changed, 128 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index cf06ee563..46a85fd31 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1050,6 +1050,8 @@ preadv203_64 preadv203_64
 
 profil01 profil01
 
+process_mrelease01 process_mrelease01
+
 process_vm_readv01 process_vm01 -r
 process_vm_readv02 process_vm_readv02
 process_vm_readv03 process_vm_readv03
diff --git a/testcases/kernel/syscalls/process_mrelease/.gitignore b/testcases/kernel/syscalls/process_mrelease/.gitignore
new file mode 100644
index 000000000..673983858
--- /dev/null
+++ b/testcases/kernel/syscalls/process_mrelease/.gitignore
@@ -0,0 +1 @@
+/process_mrelease01
diff --git a/testcases/kernel/syscalls/process_mrelease/Makefile b/testcases/kernel/syscalls/process_mrelease/Makefile
new file mode 100644
index 000000000..8cf1b9024
--- /dev/null
+++ b/testcases/kernel/syscalls/process_mrelease/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+
+top_srcdir		?= ../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/syscalls/process_mrelease/process_mrelease01.c b/testcases/kernel/syscalls/process_mrelease/process_mrelease01.c
new file mode 100644
index 000000000..aa7c9960c
--- /dev/null
+++ b/testcases/kernel/syscalls/process_mrelease/process_mrelease01.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that process_mrelease() syscall is releasing memory from
+ * a killed process with memory allocation pending.
+ */
+
+#include "tst_test.h"
+#include "lapi/syscalls.h"
+
+#define CHUNK (1 * TST_MB)
+#define MAX_SIZE_MB (128 * TST_MB)
+
+static void *mem;
+static volatile int *mem_size;
+
+static void do_child(int size)
+{
+	tst_res(TINFO, "Child: allocate %d bytes", size);
+
+	mem = SAFE_MMAP(NULL,
+		size,
+		PROT_READ | PROT_WRITE,
+		MAP_PRIVATE | MAP_ANON,
+		0, 0);
+
+	TST_CHECKPOINT_WAKE_AND_WAIT(0);
+
+	tst_res(TINFO, "Child: releasing memory");
+
+	SAFE_MUNMAP(mem, size);
+}
+
+static void run(void)
+{
+	int ret;
+	int pidfd;
+	int status;
+	pid_t pid;
+	volatile int restart;
+
+	for (*mem_size = CHUNK; *mem_size < MAX_SIZE_MB; *mem_size += CHUNK) {
+		restart = 0;
+
+		pid = SAFE_FORK();
+		if (!pid) {
+			do_child(*mem_size);
+			exit(0);
+		}
+
+		TST_CHECKPOINT_WAIT(0);
+
+		tst_disable_oom_protection(pid);
+
+		pidfd = SAFE_PIDFD_OPEN(pid, 0);
+
+		tst_res(TINFO, "Parent: killing child with PID=%d", pid);
+
+		SAFE_KILL(pid, SIGKILL);
+
+		ret = tst_syscall(__NR_process_mrelease, pidfd, 0);
+		if (ret == -1) {
+			if (errno == ESRCH) {
+				tst_res(TINFO, "Parent: child terminated before process_mrelease()."
+					" Increase memory size and restart test");
+
+				restart = 1;
+			} else {
+				tst_res(TFAIL | TERRNO, "process_mrelease(%d,0) error", pidfd);
+			}
+		} else {
+			tst_res(TPASS, "process_mrelease(%d,0) passed", pidfd);
+		}
+
+		SAFE_WAITPID(-1, &status, 0);
+		SAFE_CLOSE(pidfd);
+
+		if (!restart)
+			break;
+	}
+}
+
+static void setup(void)
+{
+	mem_size = SAFE_MMAP(
+		NULL,
+		sizeof(int),
+		PROT_READ | PROT_WRITE,
+		MAP_SHARED | MAP_ANONYMOUS,
+		-1, 0);
+}
+
+static void cleanup(void)
+{
+	if (mem)
+		SAFE_MUNMAP(mem, *mem_size);
+
+	if (mem_size)
+		SAFE_MUNMAP((void *)mem_size, sizeof(int));
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run,
+	.needs_root = 1,
+	.forks_child = 1,
+	.min_kver = "5.15",
+	.needs_checkpoints = 1,
+	.needs_kconfigs = (const char *[]) {
+		"CONFIG_MMU=y",
+	},
+};

-- 
2.35.3


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