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@xxxxxxxxxx>
---
samples/landlock/sandboxer.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c
index 32e930c853bb..997f774e88ae 100644
--- a/samples/landlock/sandboxer.c
+++ b/samples/landlock/sandboxer.c
@@ -81,7 +81,8 @@ 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 */
@@ -201,11 +202,12 @@ static int populate_ruleset_net(const char *const env_var, const int ruleset_fd,
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)
{
@@ -319,6 +321,11 @@ 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 "
--
2.44.0.396.g6e790dbe36-goog
