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selftests/landlock: Test IOCTL with memfds

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Because the LANDLOCK_ACCESS_FS_IOCTL_DEV right is associated with the
opened file during open(2), IOCTLs are supposed to work with files
which are opened by means other than open(2).

Signed-off-by: Günther Noack <gnoack@google.com>
Link: https://lore.kernel.org/r/20240419161122.2023765-4-gnoack@google.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Günther Noack 2024-04-19 16:11:14 +00:00 committed by Mickaël Salaün
parent 3ecf19e568
commit dd6d32afdf
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1 changed files with 36 additions and 8 deletions
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44
tools/testing/selftests/landlock/fs_test.c
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@ -3849,20 +3849,48 @@ TEST_F_FORK(ftruncate, open_and_ftruncate_in_different_processes)
ASSERT_EQ(0, close(socket_fds[1]));
}
TEST(memfd_ftruncate)
/* Invokes the FS_IOC_GETFLAGS IOCTL and returns its errno or 0. */
static int test_fs_ioc_getflags_ioctl(int fd)
{
int fd;
uint32_t flags;
fd = memfd_create("name", MFD_CLOEXEC);
ASSERT_LE(0, fd);
if (ioctl(fd, FS_IOC_GETFLAGS, &flags) < 0)
return errno;
return 0;
}
TEST(memfd_ftruncate_and_ioctl)
{
const struct landlock_ruleset_attr attr = {
.handled_access_fs = ACCESS_ALL,
};
int ruleset_fd, fd, i;
/*
* Checks that ftruncate is permitted on file descriptors that are
* created in ways other than open(2).
* We exercise the same test both with and without Landlock enabled, to
* ensure that it behaves the same in both cases.
*/
EXPECT_EQ(0, test_ftruncate(fd));
for (i = 0; i < 2; i++) {
/* Creates a new memfd. */
fd = memfd_create("name", MFD_CLOEXEC);
ASSERT_LE(0, fd);
ASSERT_EQ(0, close(fd));
/*
* Checks that operations associated with the opened file
* (ftruncate, ioctl) are permitted on file descriptors that are
* created in ways other than open(2).
*/
EXPECT_EQ(0, test_ftruncate(fd));
EXPECT_EQ(0, test_fs_ioc_getflags_ioctl(fd));
ASSERT_EQ(0, close(fd));
/* Enables Landlock. */
ruleset_fd = landlock_create_ruleset(&attr, sizeof(attr), 0);
ASSERT_LE(0, ruleset_fd);
enforce_ruleset(_metadata, ruleset_fd);
ASSERT_EQ(0, close(ruleset_fd));
}
}
static int test_fionread_ioctl(int fd)