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| author | Günther Noack <gnoack3000@gmail.com> | 2022-10-18 20:22:15 +0200 |
|---|---|---|
| committer | Mickaël Salaün <mic@digikod.net> | 2022-10-19 09:01:47 +0200 |
| commit | faeb9197669c23d983f6485d278b20f0194432f4 (patch) | |
| tree | 7b237d996b8d075d38078dedc47d0522b533285a /samples/landlock | |
| parent | selftests/landlock: Test ftruncate on FDs created by memfd_create(2) (diff) | |
| download | linux-faeb9197669c23d983f6485d278b20f0194432f4.tar.xz linux-faeb9197669c23d983f6485d278b20f0194432f4.zip | |
samples/landlock: Extend sample tool to support LANDLOCK_ACCESS_FS_TRUNCATE
Update the sandboxer sample to restrict truncate actions. This is
automatically enabled by default if the running kernel supports
LANDLOCK_ACCESS_FS_TRUNCATE, except for the paths listed in the
LL_FS_RW environment variable.
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20221018182216.301684-11-gnoack3000@gmail.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Diffstat (limited to 'samples/landlock')
| -rw-r--r-- | samples/landlock/sandboxer.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c index f29bb3c72230..fd4237c64fb2 100644 --- a/samples/landlock/sandboxer.c +++ b/samples/landlock/sandboxer.c @@ -76,7 +76,8 @@ static int parse_path(char *env_path, const char ***const path_list) #define ACCESS_FILE ( \ LANDLOCK_ACCESS_FS_EXECUTE | \ LANDLOCK_ACCESS_FS_WRITE_FILE | \ - LANDLOCK_ACCESS_FS_READ_FILE) + LANDLOCK_ACCESS_FS_READ_FILE | \ + LANDLOCK_ACCESS_FS_TRUNCATE) /* clang-format on */ @@ -160,11 +161,12 @@ out_free_name: LANDLOCK_ACCESS_FS_MAKE_FIFO | \ LANDLOCK_ACCESS_FS_MAKE_BLOCK | \ LANDLOCK_ACCESS_FS_MAKE_SYM | \ - LANDLOCK_ACCESS_FS_REFER) + LANDLOCK_ACCESS_FS_REFER | \ + LANDLOCK_ACCESS_FS_TRUNCATE) /* clang-format on */ -#define LANDLOCK_ABI_LAST 2 +#define LANDLOCK_ABI_LAST 3 int main(const int argc, char *const argv[], char *const *const envp) { @@ -234,6 +236,10 @@ int main(const int argc, char *const argv[], char *const *const envp) case 1: /* Removes LANDLOCK_ACCESS_FS_REFER for ABI < 2 */ ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_REFER; + __attribute__((fallthrough)); + case 2: + /* Removes LANDLOCK_ACCESS_FS_TRUNCATE for ABI < 3 */ + ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_TRUNCATE; fprintf(stderr, "Hint: You should update the running kernel " |