This is a note to let you know that I've just added the patch titled
net: compat: Update get_compat_msghdr() to match copy_msghdr_from_user()
behaviour
to the 3.10-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:
net-compat-update-get_compat_msghdr-to-match-copy_msghdr_from_user-behaviour.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Tue Mar 24 11:01:55 CET 2015
From: Catalin Marinas <[email protected]>
Date: Fri, 20 Mar 2015 16:48:13 +0000
Subject: net: compat: Update get_compat_msghdr() to match
copy_msghdr_from_user() behaviour
From: Catalin Marinas <[email protected]>
[ Upstream commit 91edd096e224941131f896b86838b1e59553696a ]
Commit db31c55a6fb2 (net: clamp ->msg_namelen instead of returning an
error) introduced the clamping of msg_namelen when the unsigned value
was larger than sizeof(struct sockaddr_storage). This caused a
msg_namelen of -1 to be valid. The native code was subsequently fixed by
commit dbb490b96584 (net: socket: error on a negative msg_namelen).
In addition, the native code sets msg_namelen to 0 when msg_name is
NULL. This was done in commit (6a2a2b3ae075 net:socket: set msg_namelen
to 0 if msg_name is passed as NULL in msghdr struct from userland) and
subsequently updated by 08adb7dabd48 (fold verify_iovec() into
copy_msghdr_from_user()).
This patch brings the get_compat_msghdr() in line with
copy_msghdr_from_user().
Fixes: db31c55a6fb2 (net: clamp ->msg_namelen instead of returning an error)
Cc: David S. Miller <[email protected]>
Cc: Dan Carpenter <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/compat.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/net/compat.c
+++ b/net/compat.c
@@ -71,6 +71,13 @@ int get_compat_msghdr(struct msghdr *kms
__get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
__get_user(kmsg->msg_flags, &umsg->msg_flags))
return -EFAULT;
+
+ if (!tmp1)
+ kmsg->msg_namelen = 0;
+
+ if (kmsg->msg_namelen < 0)
+ return -EINVAL;
+
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
kmsg->msg_name = compat_ptr(tmp1);
Patches currently in stable-queue which might be from [email protected]
are
queue-3.10/net-compat-update-get_compat_msghdr-to-match-copy_msghdr_from_user-behaviour.patch
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