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io_uring: verify pad field is 0 in io_get_ext_arg
author
Dylan Yudaken
<dylany@fb.com>
Tue, 12 Apr 2022 16:30:42 +0000
(09:30 -0700)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Wed, 20 Apr 2022 07:34:12 +0000
(09:34 +0200)
[ 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@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>
fs/io_uring.c
patch
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diff --git
a/fs/io_uring.c
b/fs/io_uring.c
index
66671c0
..
cc0a07a
100644
(file)
--- a/
fs/io_uring.c
+++ b/
fs/io_uring.c
@@
-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);