From: Jens Axboe axboe@kernel.dk
commit 73e08e711d9c1d79fae01daed4b0e1fee5f8a275 upstream.
This ends up being too restrictive for tasks that willingly fork and share the ring between forks. Andres reports that this breaks his postgresql work. Since we're close to 5.5 release, revert this change for now.
Cc: stable@vger.kernel.org Fixes: 44d282796f81 ("io_uring: only allow submit from owning task") Reported-by: Andres Freund andres@anarazel.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/io_uring.c | 6 ------ 1 file changed, 6 deletions(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3716,12 +3716,6 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned wake_up(&ctx->sqo_wait); submitted = to_submit; } else if (to_submit) { - if (current->mm != ctx->sqo_mm || - current_cred() != ctx->creds) { - ret = -EPERM; - goto out; - } - to_submit = min(to_submit, ctx->sq_entries);
mutex_lock(&ctx->uring_lock);