diff options
| author | Günther Noack <gnoack3000@gmail.com> | 2022-10-18 20:22:06 +0200 |
|---|---|---|
| committer | Mickaël Salaün <mic@digikod.net> | 2022-10-19 09:01:40 +0200 |
| commit | 3350607dc5637be2563f484dcfe2fed456f3d4ff (patch) | |
| tree | fda8bd79084e26e2062fec46370c1a572b0d187f /security/apparmor/lsm.c | |
| parent | 9abf2313adc1ca1b6180c508c25f22f9395cc780 (diff) | |
security: Create file_truncate hook from path_truncate hook
Like path_truncate, the file_truncate hook also restricts file
truncation, but is called in the cases where truncation is attempted
on an already-opened file.
This is required in a subsequent commit to handle ftruncate()
operations differently to truncate() operations.
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: John Johansen <john.johansen@canonical.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20221018182216.301684-2-gnoack3000@gmail.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Diffstat (limited to 'security/apparmor/lsm.c')
| -rw-r--r-- | security/apparmor/lsm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index f56070270c69..be31549cfb40 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -329,6 +329,11 @@ static int apparmor_path_truncate(const struct path *path) return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); } +static int apparmor_file_truncate(struct file *file) +{ + return apparmor_path_truncate(&file->f_path); +} + static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, const char *old_name) { @@ -1232,6 +1237,7 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), LSM_HOOK_INIT(file_lock, apparmor_file_lock), + LSM_HOOK_INIT(file_truncate, apparmor_file_truncate), LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), |