From b29d143a690a660b27e7e84c01dd541d38fe9372 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Sun, 26 Jan 2020 09:53:12 -0700 Subject: Revert "io_uring: only allow submit from owning task" 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 Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'fs/io_uring.c') diff --git a/fs/io_uring.c b/fs/io_uring.c index b1c9ad1fb9e1..709671faaed6 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3716,12 +3716,6 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, 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); -- cgit v1.2.3