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CRED: Use RCU to access another task's creds and to release a task's own creds

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Use RCU to access another task's creds and to release a task's own creds.
This means that it will be possible for the credentials of a task to be
replaced without another task (a) requiring a full lock to read them, and (b)
seeing deallocated memory.

Signed-off-by: David Howells <[email protected]>
Acked-by: James Morris <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
David Howells 2008-11-14 10:39:19 +11:00 • committed by James Morris
commit c69e8d9c01
28 changed files with 355 additions and 204 deletions
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23
fs/fuse/dir.c
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@ -869,18 +869,25 @@ int fuse_update_attributes(struct inode *inode, struct kstat *stat,
*/
int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
{
const struct cred *cred;
int ret;
if (fc->flags & FUSE_ALLOW_OTHER)
return 1;
if (task->cred->euid == fc->user_id &&
task->cred->suid == fc->user_id &&
task->cred->uid == fc->user_id &&
task->cred->egid == fc->group_id &&
task->cred->sgid == fc->group_id &&
task->cred->gid == fc->group_id)
return 1;
rcu_read_lock();
ret = 0;
cred = __task_cred(task);
if (cred->euid == fc->user_id &&
cred->suid == fc->user_id &&
cred->uid == fc->user_id &&
cred->egid == fc->group_id &&
cred->sgid == fc->group_id &&
cred->gid == fc->group_id)
ret = 1;
rcu_read_unlock();
return 0;
return ret;
}
static int fuse_access(struct inode *inode, int mask)