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| author | Casey Schaufler <casey@schaufler-ca.com> | 2020-12-22 15:34:24 -0800 |
|---|---|---|
| committer | Casey Schaufler <casey@schaufler-ca.com> | 2020-12-22 15:34:24 -0800 |
| commit | 942cb357ae7d9249088e3687ee6a00ed2745a0c7 (patch) | |
| tree | 2bfffd5812fb64ccb43da0308773525dfda99277 /security/smack | |
| parent | 9b0072e2b2b588ad75c94f2c6e6c52c8f4bd2657 (diff) | |
| download | lwn-942cb357ae7d9249088e3687ee6a00ed2745a0c7.tar.gz lwn-942cb357ae7d9249088e3687ee6a00ed2745a0c7.zip | |
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: Jens Axboe <axboe@kernel.dk>
Acked-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack')
| -rw-r--r-- | security/smack/smack_access.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index efe2406a3960..7eabb448acab 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -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()); |