netdev - Re: [PATCH] af_key: fix buffer overread in parse

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Message-ID: <20171231075214.gjwbdegozcqyqukk@gauss3.secunet.de>
Date:   Sun, 31 Dec 2017 08:52:14 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Eric Biggers <ebiggers3@...il.com>
CC:     <netdev@...r.kernel.org>, Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>,
        Eric Biggers <ebiggers@...gle.com>, <stable@...r.kernel.org>
Subject: Re: [PATCH] af_key: fix buffer overread in parse_exthdrs()

On Fri, Dec 29, 2017 at 06:15:23PM -0600, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> If a message sent to a PF_KEY socket ended with an incomplete extension
> header (fewer than 4 bytes remaining), then parse_exthdrs() read past
> the end of the message, into uninitialized memory.  Fix it by returning
> -EINVAL in this case.
> 
> Reproducer:
> 
> 	#include <linux/pfkeyv2.h>
> 	#include <sys/socket.h>
> 	#include <unistd.h>
> 
> 	int main()
> 	{
> 		int sock = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
> 		char buf[17] = { 0 };
> 		struct sadb_msg *msg = (void *)buf;
> 
> 		msg->sadb_msg_version = PF_KEY_V2;
> 		msg->sadb_msg_type = SADB_DELETE;
> 		msg->sadb_msg_len = 2;
> 
> 		write(sock, buf, 17);
> 	}
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Also applied to the ipsec tree, thanks a lot!