[PATCH v3 2/3] tomoyo: replace current->in_execve flag with security_execve_abort() hook
Tetsuo Handa
penguin-kernel at I-love.SAKURA.ne.jp
Tue Feb 6 13:59:31 UTC 2024
TOMOYO was using current->in_execve flag in order to restore previous state
when previous execve() request failed. Since security_execve_abort() hook
was added, switch to use it.
Signed-off-by: Tetsuo Handa <penguin-kernel at I-love.SAKURA.ne.jp>
Acked-by: Serge E. Hallyn <serge at hallyn.com>
---
security/tomoyo/tomoyo.c | 22 +++++-----------------
1 file changed, 5 insertions(+), 17 deletions(-)
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 04a92c3d65d4..a11dba3a9753 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -18,34 +18,22 @@ struct tomoyo_domain_info *tomoyo_domain(void)
{
struct tomoyo_task *s = tomoyo_task(current);
- if (s->old_domain_info && !current->in_execve) {
- atomic_dec(&s->old_domain_info->users);
- s->old_domain_info = NULL;
- }
return s->domain_info;
}
/**
- * tomoyo_cred_prepare - Target for security_prepare_creds().
- *
- * @new: Pointer to "struct cred".
- * @old: Pointer to "struct cred".
- * @gfp: Memory allocation flags.
- *
- * Returns 0.
+ * tomoyo_execve_abort - Target for security_execve_abort().
*/
-static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
- gfp_t gfp)
+static void tomoyo_execve_abort(void)
{
- /* Restore old_domain_info saved by previous execve() request. */
+ /* Restore old_domain_info saved by execve() request. */
struct tomoyo_task *s = tomoyo_task(current);
- if (s->old_domain_info && !current->in_execve) {
+ if (s->old_domain_info) {
atomic_dec(&s->domain_info->users);
s->domain_info = s->old_domain_info;
s->old_domain_info = NULL;
}
- return 0;
}
/**
@@ -554,8 +542,8 @@ static const struct lsm_id tomoyo_lsmid = {
* registering TOMOYO.
*/
static struct security_hook_list tomoyo_hooks[] __ro_after_init = {
- LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare),
LSM_HOOK_INIT(bprm_committed_creds, tomoyo_bprm_committed_creds),
+ LSM_HOOK_INIT(execve_abort, tomoyo_execve_abort),
LSM_HOOK_INIT(task_alloc, tomoyo_task_alloc),
LSM_HOOK_INIT(task_free, tomoyo_task_free),
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
--
2.18.4
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