[PATCH AUTOSEL 6.1 49/49] scm: add user copy checks to put_cmsg()

Sasha Levin
2023-02-26T15:39:01Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit 5f1eb1ff58ea122e24adf0bc940f268ed2227462 ]

This is a followup of commit 2558b8039d05 ("net: use a bounce
buffer for copying skb->mark")

x86 and powerpc define user_access_begin, meaning
that they are not able to perform user copy checks
when using user_write_access_begin() / unsafe_copy_to_user()
and friends [1]

Instead of waiting bugs to trigger on other arches,
add a check_object_size() in put_cmsg() to make sure
that new code tested on x86 with CONFIG_HARDENED_USERCOPY=y
will perform more security checks.

[1] We can not generically call check_object_size() from
unsafe_copy_to_user() because UACCESS is enabled at this point.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Kees Cook <keescook@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/core/scm.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/core/scm.c b/net/core/scm.c
index 5c356f0dee30c..acb7d776fa6ec 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -229,6 +229,8 @@ int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
if (msg->msg_control_is_user) {
struct cmsghdr __user *cm = msg->msg_control_user;

+ check_object_size(data, cmlen - sizeof(*cm), true);
+
if (!user_write_access_begin(cm, cmlen))
goto efault;

--
2.39.0