[PATCH 5.17 676/772] selftests/landlock: Make tests build with old libc

Greg Kroah-Hartman
2022-06-07T21:47:54Z

From: Mickaël Salaün <mic@digikod.net>

commit 87129ef13603ae46c82bcd09eed948acf0506dbb upstream.

Replace SYS_<syscall> with __NR_<syscall>. Using the __NR_<syscall>
notation, provided by UAPI, is useful to build tests on systems without
the SYS_<syscall> definitions.

Replace SYS_pivot_root with __NR_pivot_root, and SYS_move_mount with
__NR_move_mount.

Define renameat2() and RENAME_EXCHANGE if they are unknown to old build
systems.

Cc: Shuah Khan <shuah@kernel.org>
Link: https://lore.kernel.org/r/20220506160820.524344-3-mic@digikod.net
Cc: stable@vger.kernel.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/testing/selftests/landlock/fs_test.c | 23 ++++++++++++++++++-----
1 file changed, 18 insertions(+), 5 deletions(-)

--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -22,6 +22,19 @@

#include "common.h"

+#ifndef renameat2
+int renameat2(int olddirfd, const char *oldpath, int newdirfd,
+ const char *newpath, unsigned int flags)
+{
+ return syscall(__NR_renameat2, olddirfd, oldpath, newdirfd, newpath,
+ flags);
+}
+#endif
+
+#ifndef RENAME_EXCHANGE
+#define RENAME_EXCHANGE (1 << 1)
+#endif
+
#define TMP_DIR "tmp"
#define BINARY_PATH "./true"

@@ -1279,7 +1292,7 @@ TEST_F_FORK(layout1, rule_inside_mount_n
int ruleset_fd;

set_cap(_metadata, CAP_SYS_ADMIN);
- ASSERT_EQ(0, syscall(SYS_pivot_root, dir_s3d2, dir_s3d3))
+ ASSERT_EQ(0, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3))
{
TH_LOG("Failed to pivot root: %s", strerror(errno));
};
@@ -1313,7 +1326,7 @@ TEST_F_FORK(layout1, mount_and_pivot)
set_cap(_metadata, CAP_SYS_ADMIN);
ASSERT_EQ(-1, mount(NULL, dir_s3d2, NULL, MS_RDONLY, NULL));
ASSERT_EQ(EPERM, errno);
- ASSERT_EQ(-1, syscall(SYS_pivot_root, dir_s3d2, dir_s3d3));
+ ASSERT_EQ(-1, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3));
ASSERT_EQ(EPERM, errno);
clear_cap(_metadata, CAP_SYS_ADMIN);
}
@@ -1332,13 +1345,13 @@ TEST_F_FORK(layout1, move_mount)
ASSERT_LE(0, ruleset_fd);

set_cap(_metadata, CAP_SYS_ADMIN);
- ASSERT_EQ(0, syscall(SYS_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD,
+ ASSERT_EQ(0, syscall(__NR_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD,
dir_s1d2, 0))
{
TH_LOG("Failed to move mount: %s", strerror(errno));
}

- ASSERT_EQ(0, syscall(SYS_move_mount, AT_FDCWD, dir_s1d2, AT_FDCWD,
+ ASSERT_EQ(0, syscall(__NR_move_mount, AT_FDCWD, dir_s1d2, AT_FDCWD,
dir_s3d2, 0));
clear_cap(_metadata, CAP_SYS_ADMIN);

@@ -1346,7 +1359,7 @@ TEST_F_FORK(layout1, move_mount)
ASSERT_EQ(0, close(ruleset_fd));

set_cap(_metadata, CAP_SYS_ADMIN);
- ASSERT_EQ(-1, syscall(SYS_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD,
+ ASSERT_EQ(-1, syscall(__NR_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD,
dir_s1d2, 0));
ASSERT_EQ(EPERM, errno);
clear_cap(_metadata, CAP_SYS_ADMIN);