Commit 942cb357 authored by Casey Schaufler's avatar Casey Schaufler

Smack: Handle io_uring kernel thread privileges

Smack assumes that kernel threads are privileged for smackfs
operations. This was necessary because the credential of the
kernel thread was not related to a user operation. With io_uring
the credential does reflect a user's rights and can be used.
Suggested-by: default avatarJens Axboe <axboe@kernel.dk>
Acked-by: default avatarJens Axboe <axboe@kernel.dk>
Acked-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarCasey Schaufler <casey@schaufler-ca.com>
parent 9b0072e2
......@@ -688,9 +688,10 @@ bool smack_privileged_cred(int cap, const struct cred *cred)
bool smack_privileged(int cap)
{
/*
* All kernel tasks are privileged
* Kernel threads may not have credentials we can use.
* The io_uring kernel threads do have reliable credentials.
*/
if (unlikely(current->flags & PF_KTHREAD))
if ((current->flags & (PF_KTHREAD | PF_IO_WORKER)) == PF_KTHREAD)
return true;
return smack_privileged_cred(cap, current_cred());
......
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