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samples/landlock: Add support for LANDLOCK_ACCESS_FS_IOCTL_DEV 

JIRA: https://issues.redhat.com/browse/RHEL-8810

Add IOCTL support to the Landlock sample tool.

The IOCTL right is grouped with the read-write rights in the sample
tool, as some IOCTL requests provide features that mutate state.

Signed-off-by: Günther Noack <gnoack@google.com>
Link: https://lore.kernel.org/r/20240419161122.2023765-9-gnoack@google.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>
(cherry picked from commit cd13738d44c9863ce54243fdcc2d228233f23355)
Signed-off-by: Ryan Sullivan <rysulliv@redhat.com>
This commit is contained in:
Ryan Sullivan 2025-01-24 12:16:44 -05:00
parent 35b911587c
commit f5da44fdc3
1 changed files with 10 additions and 3 deletions
samples/landlock
sandboxer.c

13
samples/landlock/sandboxer.c
View File

@ -100,7 +100,8 @@ static int parse_path(char *env_path, const char ***const path_list)
LANDLOCK_ACCESS_FS_EXECUTE | \
LANDLOCK_ACCESS_FS_WRITE_FILE | \
LANDLOCK_ACCESS_FS_READ_FILE | \
LANDLOCK_ACCESS_FS_TRUNCATE)
LANDLOCK_ACCESS_FS_TRUNCATE | \
LANDLOCK_ACCESS_FS_IOCTL_DEV)
/* clang-format on */
@ -230,11 +231,12 @@ out_free_name:
LANDLOCK_ACCESS_FS_MAKE_BLOCK | \
LANDLOCK_ACCESS_FS_MAKE_SYM | \
LANDLOCK_ACCESS_FS_REFER | \
LANDLOCK_ACCESS_FS_TRUNCATE)
LANDLOCK_ACCESS_FS_TRUNCATE | \
LANDLOCK_ACCESS_FS_IOCTL_DEV)
/* clang-format on */
#define LANDLOCK_ABI_LAST 4
#define LANDLOCK_ABI_LAST 5
int main(const int argc, char *const argv[], char *const *const envp)
{
@ -348,6 +350,11 @@ int main(const int argc, char *const argv[], char *const *const envp)
ruleset_attr.handled_access_net &=
~(LANDLOCK_ACCESS_NET_BIND_TCP |
LANDLOCK_ACCESS_NET_CONNECT_TCP);
__attribute__((fallthrough));
case 4:
/* Removes LANDLOCK_ACCESS_FS_IOCTL_DEV for ABI < 5 */
ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_IOCTL_DEV;
fprintf(stderr,
"Hint: You should update the running kernel "
"to leverage Landlock features "