linux-kernel - [PATCH v4 10/10] selftests/nolibc: add mmap and munmap test cases

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Message-Id: <9c46f648cd8c784405afed565bed120f0a2f239e.1687187451.git.falcon@tinylab.org>
Date:   Mon, 19 Jun 2023 23:55:41 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     w@....eu
Cc:     david.laight@...lab.com, arnd@...db.de, falcon@...ylab.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-riscv@...ts.infradead.org, thomas@...ch.de
Subject: [PATCH v4 10/10] selftests/nolibc: add mmap and munmap test cases

Three mmap/munmap related test cases are added:

- mmap(NULL, 0, PROT_READ, MAP_PRIVATE, 0, 0), MAP_FAILED, EINVAL)

  The length argument must be greater than 0, otherwise, fail with -EINVAL.

- munmap((void *)-1, 4*1024), -1, EINVAL)

  Invalid (void *)-1 address fail with -EINVAL.

- test_mmap_munmap(4*1024)

  It finds a init file, mmap() it and then munmap().

Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 80ab29e2887c..f7c0ca72cb28 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -592,6 +592,34 @@ static int test_stat_timestamps(void)
 	return 0;
 }
 
+int test_mmap_munmap(int size)
+{
+	char init_files[5][20] = {"/init", "/sbin/init", "/etc/init", "/bin/init", "/bin/sh"};
+	int ret, fd, i;
+	void *mem;
+
+	for (i = 0; i < 5; i++) {
+		ret = fd = open(init_files[i], O_RDONLY);
+		if (ret < 0)
+			continue;
+		else
+			break;
+	}
+	if (ret < 0)
+		return ret;
+
+	mem = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
+	if (mem == MAP_FAILED)
+		return -1;
+
+	ret = munmap(mem, size);
+	if (ret < 0)
+		return ret;
+
+	return close(fd);
+}
+
+
 /* Run syscall tests between IDs <min> and <max>.
  * Return 0 on success, non-zero on failure.
  */
@@ -666,6 +694,9 @@ int run_syscall(int min, int max)
 		CASE_TEST(lseek_m1);          EXPECT_SYSER(1, lseek(-1, 0, SEEK_SET), -1, EBADF); break;
 		CASE_TEST(lseek_0);           EXPECT_SYSER(1, lseek(0, 0, SEEK_SET), -1, ESPIPE); break;
 		CASE_TEST(mkdir_root);        EXPECT_SYSER(1, mkdir("/", 0755), -1, EEXIST); break;
+		CASE_TEST(mmap_bad);          EXPECT_PTRER(1, mmap(NULL, 0, PROT_READ, MAP_PRIVATE, 0, 0), MAP_FAILED, EINVAL); break;
+		CASE_TEST(munmap_bad);        EXPECT_SYSER(1, munmap((void *)-1, 0), -1, EINVAL); break;
+		CASE_TEST(mmap_good);         EXPECT_SYSZR(1, test_mmap_munmap(4*1024)); break;
 		CASE_TEST(open_tty);          EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break;
 		CASE_TEST(open_blah);         EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break;
 		CASE_TEST(poll_null);         EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
-- 
2.25.1