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io_uring: verify pad field is 0 in io_get_ext_arg

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[ Upstream commit d2347b9695 ]

Ensure that only 0 is passed for pad here.

Fixes: c73ebb685f ("io_uring: add timeout support for io_uring_enter()")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220412163042.2788062-5-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dylan Yudaken 2022-04-12 09:30:42 -07:00 committed by Greg Kroah-Hartman
parent 7a7c9f9de9
commit 9947548d9c
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -9981,6 +9981,8 @@ 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);