[LTP] [PATCH v1] Add lstat03 test

[LTP] [PATCH v1] Add lstat03 test

[Andrea Cervesato]

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

This test has been extracted from symlink01 test and it verifies
lstat() syscall functionalities on symlink generated file.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                           |  4 +-
 testcases/kernel/syscalls/lstat/.gitignore |  2 +
 testcases/kernel/syscalls/lstat/lstat03.c  | 69 ++++++++++++++++++++++
 3 files changed, 73 insertions(+), 2 deletions(-)
 create mode 100644 testcases/kernel/syscalls/lstat/lstat03.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 6e2407879..69ac20b49 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -723,12 +723,12 @@ lseek02 lseek02
 lseek07 lseek07
 lseek11 lseek11
 
-lstat01A symlink01 -T lstat01
-lstat01A_64 symlink01 -T lstat01_64
 lstat01 lstat01
 lstat01_64 lstat01_64
 lstat02 lstat02
 lstat02_64 lstat02_64
+lstat03 lstat03
+lstat03_64 lstat03_64
 
 mallinfo02 mallinfo02
 
diff --git a/testcases/kernel/syscalls/lstat/.gitignore b/testcases/kernel/syscalls/lstat/.gitignore
index a497a445f..72cba871f 100644
--- a/testcases/kernel/syscalls/lstat/.gitignore
+++ b/testcases/kernel/syscalls/lstat/.gitignore
@@ -2,3 +2,5 @@
 /lstat01_64
 /lstat02
 /lstat02_64
+/lstat03
+/lstat03_64
diff --git a/testcases/kernel/syscalls/lstat/lstat03.c b/testcases/kernel/syscalls/lstat/lstat03.c
new file mode 100644
index 000000000..86efed348
--- /dev/null
+++ b/testcases/kernel/syscalls/lstat/lstat03.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
+ *    Author: David Fenner
+ *    Copilot: Jon Hendrickson
+ * Copyright (C) 2024 Andrea Cervesato andrea.cervesato@suse.com
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that lstat() is working correctly on symlink()
+ * generated files.
+ */
+
+#include "tst_test.h"
+
+static void test_lstat(void)
+{
+	char *symname = "my_symlink0";
+
+	TST_EXP_PASS(symlink(tst_get_tmpdir(), symname));
+
+	struct stat path_stat;
+	struct stat link_stat;
+
+	SAFE_LSTAT(tst_get_tmpdir(), &path_stat);
+	SAFE_LSTAT(symname, &link_stat);
+
+	TST_EXP_EQ_LI(path_stat.st_dev, link_stat.st_dev);
+	TST_EXP_EQ_LI(path_stat.st_nlink, link_stat.st_nlink);
+	TST_EXP_EQ_LI(path_stat.st_uid, link_stat.st_uid);
+	TST_EXP_EQ_LI(path_stat.st_gid, link_stat.st_gid);
+	TST_EXP_EQ_LI(path_stat.st_atime, link_stat.st_atime);
+	TST_EXP_EQ_LI(path_stat.st_mtime, link_stat.st_mtime);
+	TST_EXP_EQ_LI(path_stat.st_ctime, link_stat.st_ctime);
+
+	TST_EXP_EXPR(path_stat.st_mode != link_stat.st_mode,
+		"object and symbolic link have different st_mode");
+	TST_EXP_EXPR(path_stat.st_size != link_stat.st_size,
+		"object and symbolic link have different st_size");
+
+	SAFE_UNLINK(symname);
+}
+
+static void test_lstat_no_path(void)
+{
+	char *symname = "my_symlink1";
+	struct stat link_stat;
+
+	TST_EXP_PASS(symlink("bc+eFhi!k", symname));
+
+	SAFE_LSTAT(symname, &link_stat);
+	TST_EXP_EXPR((link_stat.st_mode & S_IFMT) == S_IFLNK,
+		"can read symlink file information");
+
+	SAFE_UNLINK(symname);
+}
+
+static void run(void)
+{
+	test_lstat();
+	test_lstat_no_path();
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.needs_tmpdir = 1,
+};
-- 
2.35.3


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Re: [LTP] [PATCH v1] Add lstat03 test

[Cyril Hrubis]

Hi!
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
> + *    Author: David Fenner
> + *    Copilot: Jon Hendrickson
> + * Copyright (C) 2024 Andrea Cervesato andrea.cervesato@suse.com
> + */
> +
> +/*\
> + * [Description]
> + *
> + * This test verifies that lstat() is working correctly on symlink()
> + * generated files.
> + */
> +
> +#include "tst_test.h"
> +
> +static void test_lstat(void)
> +{
> +	char *symname = "my_symlink0";
> +
> +	TST_EXP_PASS(symlink(tst_get_tmpdir(), symname));
> +
> +	struct stat path_stat;
> +	struct stat link_stat;
> +
> +	SAFE_LSTAT(tst_get_tmpdir(), &path_stat);
> +	SAFE_LSTAT(symname, &link_stat);

Apart from the leakage of memory does this even work correctly?

If we request information about the link itself via lstat() we get the
stat results for the link. If we call lstat() on the target of the
symlink we get the info about the target. How are these two supposed to
yield the same result?

I suppose that if we do stat() on the link and stat() on the link
tharget then we would end up with an identical results, but not for
lstat().

> +	TST_EXP_EQ_LI(path_stat.st_dev, link_stat.st_dev);
> +	TST_EXP_EQ_LI(path_stat.st_nlink, link_stat.st_nlink);
> +	TST_EXP_EQ_LI(path_stat.st_uid, link_stat.st_uid);
> +	TST_EXP_EQ_LI(path_stat.st_gid, link_stat.st_gid);
> +	TST_EXP_EQ_LI(path_stat.st_atime, link_stat.st_atime);
> +	TST_EXP_EQ_LI(path_stat.st_mtime, link_stat.st_mtime);
> +	TST_EXP_EQ_LI(path_stat.st_ctime, link_stat.st_ctime);
> +
> +	TST_EXP_EXPR(path_stat.st_mode != link_stat.st_mode,
> +		"object and symbolic link have different st_mode");
> +	TST_EXP_EXPR(path_stat.st_size != link_stat.st_size,
> +		"object and symbolic link have different st_size");
> +
> +	SAFE_UNLINK(symname);
> +}
> +
> +static void test_lstat_no_path(void)
> +{
> +	char *symname = "my_symlink1";
> +	struct stat link_stat;
> +
> +	TST_EXP_PASS(symlink("bc+eFhi!k", symname));
> +
> +	SAFE_LSTAT(symname, &link_stat);

So this is a lstat() test, right? So it should rather be SAFE_SYMLIK()
then TST_EXP_PASS(lstat(...))

> +	TST_EXP_EXPR((link_stat.st_mode & S_IFMT) == S_IFLNK,
> +		"can read symlink file information");
> +
> +	SAFE_UNLINK(symname);
> +}
> +
> +static void run(void)
> +{
> +	test_lstat();
> +	test_lstat_no_path();
> +}
> +
> +static struct tst_test test = {
> +	.test_all = run,
> +	.needs_tmpdir = 1,
> +};
> -- 
> 2.35.3
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz

-- 
Mailing list info: https://lists.linux.it/listinfo/ltp