linux-kernel - Re: [BUG] index is out of range for nfnl

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Date:	Fri, 14 Nov 2014 18:44:38 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] index is out of range for nfnl_group2type[]

On Thu, Nov 13, 2014 at 12:00:43PM +0300, Andrey Ryabinin wrote:
> FYI I've spotted this:
> 
> [  180.202810] ================================================================================
> [  180.203600] UBSan: Undefined behaviour in ../net/netfilter/nfnetlink.c:467:28
> [  180.204249] index 9 is out of range for type 'int [9]'
> [  180.204697] CPU: 0 PID: 1771 Comm: trinity-main Not tainted 3.18.0-rc4-mm1+ #122
> [  180.205365] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
> [  180.206498]  0000000000000018 0000000000000000 0000000000000009 ffff88007bdf7da8
> [  180.207220]  ffffffff82b0ef5f 0000000000000092 ffffffff845ae2e0 ffff88007bdf7db8
> [  180.207887]  ffffffff8199e489 ffff88007bdf7e18 ffffffff8199ea22 0000003900000000
> [  180.208639] Call Trace:
> [  180.208857] dump_stack (lib/dump_stack.c:52)
> [  180.209370] ubsan_epilogue (lib/ubsan.c:174)
> [  180.209849] __ubsan_handle_out_of_bounds (lib/ubsan.c:400)
> [  180.210512] nfnetlink_bind (net/netfilter/nfnetlink.c:467)
> [  180.210986] netlink_bind (net/netlink/af_netlink.c:1483)
> [  180.211495] SYSC_bind (net/socket.c:1541)
> [  180.211940] ? security_socket_setsockopt (security/security.c:1208)
> [  180.212541] ? SyS_setsockopt (net/socket.c:1920 net/socket.c:1900)
> [  180.213057] ? SyS_write (fs/read_write.c:276 fs/read_write.c:588 fs/read_write.c:577)
> [  180.213506] SyS_bind (net/socket.c:1527)
> [  180.213919] system_call_fastpath (arch/x86/kernel/entry_64.S:423)
> [  180.214479] ================================================================================

Thanks for reporting. I think the attached patch fixes this problem.

View attachment "0001-netfilter-nfnetlink-fix-insufficient-validation-in-n.patch" of type "text/x-diff" (2859 bytes)