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| author | Jens Axboe <axboe@kernel.dk> | 2021-02-14 23:21:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-04 13:38:42 +0300 |
| commit | 13fb0e1ecf7b1be545ef1023cb3e12affbeb841b (patch) | |
| tree | f5f777c6ecfa6d56c51ba74cb06a8b8b3eb2ebfb /fs/proc/self.c | |
| parent | b7cd9711a1e8cca7fe28b98ab7a633e14ad8610a (diff) | |
| download | linux-13fb0e1ecf7b1be545ef1023cb3e12affbeb841b.tar.xz | |
proc: don't allow async path resolution of /proc/thread-self components
commit 0d4370cfe36b7f1719123b621a4ec4d9c7a25f89 upstream.
If this is attempted by an io-wq kthread, then return -EOPNOTSUPP as we
don't currently support that. Once we can get task_pid_ptr() doing the
right thing, then this can go away again.
Use PF_IO_WORKER for this to speciically target the io_uring workers.
Modify the /proc/self/ check to use PF_IO_WORKER as well.
Cc: stable@vger.kernel.org
Fixes: 8d4c3e76e3be ("proc: don't allow async path resolution of /proc/self components")
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/proc/self.c')
| -rw-r--r-- | fs/proc/self.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/self.c b/fs/proc/self.c index cc71ce3466dc..a4012154e109 100644 --- a/fs/proc/self.c +++ b/fs/proc/self.c @@ -20,7 +20,7 @@ static const char *proc_self_get_link(struct dentry *dentry, * Not currently supported. Once we can inherit all of struct pid, * we can allow this. */ - if (current->flags & PF_KTHREAD) + if (current->flags & PF_IO_WORKER) return ERR_PTR(-EOPNOTSUPP); if (!tgid) |