From: Jens Axboe Date: Fri, 17 Jan 2020 02:00:24 +0000 (-0700) Subject: io_uring: only allow submit from owning task X-Git-Tag: microblaze-v5.7-rc1~224^2~3 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=44d282796f81eb1debc1d7cb53245b4cb3214cb5;p=linux-2.6-microblaze.git io_uring: only allow submit from owning task If the credentials or the mm doesn't match, don't allow the task to submit anything on behalf of this ring. The task that owns the ring can pass the file descriptor to another task, but we don't want to allow that task to submit an SQE that then assumes the ring mm and creds if it needs to go async. Cc: stable@vger.kernel.org Suggested-by: Stefan Metzmacher Signed-off-by: Jens Axboe --- diff --git a/fs/io_uring.c b/fs/io_uring.c index 52e5764540e4..187dd94fd6b1 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -5159,6 +5159,12 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, } else if (to_submit) { struct mm_struct *cur_mm; + 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); /* already have mm, so io_submit_sqes() won't try to grab it */