This is a note to let you know that I've just added the patch titled
io_uring: verify pad field is 0 in io_get_ext_arg
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-verify-pad-field-is-0-in-io_get_ext_arg.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d25481356561a73a1c207dd5f1e6a63590f24892
Author: Dylan Yudaken <dylany@xxxxxx>
Date: Tue Apr 12 09:30:42 2022 -0700
io_uring: verify pad field is 0 in io_get_ext_arg
[ Upstream commit d2347b9695dafe5c388a5f9aeb70e27a7a4d29cf ]
Ensure that only 0 is passed for pad here.
Fixes: c73ebb685fb6 ("io_uring: add timeout support for io_uring_enter()")
Signed-off-by: Dylan Yudaken <dylany@xxxxxx>
Link: https://lore.kernel.org/r/20220412163042.2788062-5-dylany@xxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2838bc6cdbc8..7a652c8eeed2 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -10109,6 +10109,8 @@ static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz
return -EINVAL;
if (copy_from_user(&arg, argp, sizeof(arg)))
return -EFAULT;
+ if (arg.pad)
+ return -EINVAL;
*sig = u64_to_user_ptr(arg.sigmask);
*argsz = arg.sigmask_sz;
*ts = u64_to_user_ptr(arg.ts);
