* Patch "af_unix: Add sockaddr length checks before accessing sa_family in bind and connect handlers" has been added to the 4.9-stable tree
@ 2017-06-29 16:59 gregkh
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From: gregkh @ 2017-06-29 16:59 UTC (permalink / raw)
To: mjurczyk, davem, gregkh; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
af_unix: Add sockaddr length checks before accessing sa_family in bind and connect handlers
to the 4.9-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:
af_unix-add-sockaddr-length-checks-before-accessing-sa_family-in-bind-and-connect-handlers.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Thu Jun 29 18:57:46 CEST 2017
From: Mateusz Jurczyk <mjurczyk@google.com>
Date: Thu, 8 Jun 2017 11:13:36 +0200
Subject: af_unix: Add sockaddr length checks before accessing sa_family in bind and connect handlers
From: Mateusz Jurczyk <mjurczyk@google.com>
[ Upstream commit defbcf2decc903a28d8398aa477b6881e711e3ea ]
Verify that the caller-provided sockaddr structure is large enough to
contain the sa_family field, before accessing it in bind() and connect()
handlers of the AF_UNIX socket. Since neither syscall enforces a minimum
size of the corresponding memory region, very short sockaddrs (zero or
one byte long) result in operating on uninitialized memory while
referencing .sa_family.
Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/unix/af_unix.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -998,7 +998,8 @@ static int unix_bind(struct socket *sock
struct path path = { NULL, NULL };
err = -EINVAL;
- if (sunaddr->sun_family != AF_UNIX)
+ if (addr_len < offsetofend(struct sockaddr_un, sun_family) ||
+ sunaddr->sun_family != AF_UNIX)
goto out;
if (addr_len == sizeof(short)) {
@@ -1109,6 +1110,10 @@ static int unix_dgram_connect(struct soc
unsigned int hash;
int err;
+ err = -EINVAL;
+ if (alen < offsetofend(struct sockaddr, sa_family))
+ goto out;
+
if (addr->sa_family != AF_UNSPEC) {
err = unix_mkname(sunaddr, alen, &hash);
if (err < 0)
Patches currently in stable-queue which might be from mjurczyk@google.com are
queue-4.9/decnet-dn_rtmsg-improve-input-length-sanitization-in-dnrmg_receive_user_skb.patch
queue-4.9/af_unix-add-sockaddr-length-checks-before-accessing-sa_family-in-bind-and-connect-handlers.patch
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2017-06-29 16:59 Patch "af_unix: Add sockaddr length checks before accessing sa_family in bind and connect handlers" has been added to the 4.9-stable tree gregkh
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