linux-kernel - [PATCH 4/4] io_uring: verify pad field is 0 in io_get_ext

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Date:   Tue, 12 Apr 2022 09:30:42 -0700
From:   Dylan Yudaken <dylany@...com>
To:     <io-uring@...r.kernel.org>
CC:     <axboe@...nel.dk>, <asml.silence@...il.com>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        Dylan Yudaken <dylany@...com>
Subject: [PATCH 4/4] io_uring: verify pad field is 0 in io_get_ext_arg

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@...com>
---
 fs/io_uring.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a84bfec97d0d..6b1a98697dcf 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -10711,6 +10711,8 @@ 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);
-- 
2.30.2