linux-kernel - net/icmp: null-ptr-deref in ping_v4_push_pending

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Date:   Mon, 6 Feb 2017 20:39:26 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: net/icmp: null-ptr-deref in ping_v4_push_pending_frames

Hi,

I've got the following error report while running the syzkaller fuzzer.

The null-ptr-deref is caused by sendto() on a socket(PF_INET,
SOCK_DGRAM, PROT_ICMP).
Note, that this requires the ability to create such sockets, which can
be configured by net.ipv4.ping_group_range
(https://lwn.net/Articles/422330/).

A reproducer and .config are attached.

On commit a572a1b999489efb591287632279c6c9eca3e4ed.

general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 2 PID: 3880 Comm: syz-executor1 Not tainted 4.10.0-rc6+ #124
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff880060048040 task.stack: ffff880069be8000
RIP: 0010:ping_v4_push_pending_frames net/ipv4/ping.c:647 [inline]
RIP: 0010:ping_v4_sendmsg+0x1acd/0x23f0 net/ipv4/ping.c:837
RSP: 0018:ffff880069bef8b8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff880069befb90 RCX: 0000000000000000
RDX: 0000000000000018 RSI: ffff880069befa30 RDI: 00000000000000c2
RBP: ffff880069befbb8 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: ffff880069befab0
R13: ffff88006c624a80 R14: ffff880069befa70 R15: 0000000000000000
FS:  00007f6f7c716700(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004a6f28 CR3: 000000003a134000 CR4: 00000000000006e0
Call Trace:
 inet_sendmsg+0x164/0x5b0 net/ipv4/af_inet.c:744
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:645
 SYSC_sendto+0x660/0x810 net/socket.c:1687
 SyS_sendto+0x40/0x50 net/socket.c:1655
 entry_SYSCALL_64_fastpath+0x1f/0xc2
RIP: 0033:0x445879
RSP: 002b:00007f6f7c715b58 EFLAGS: 00000282 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000445879
RDX: 0000000000000008 RSI: 0000000020001000 RDI: 0000000000000005
RBP: 00000000006e1ca0 R08: 0000000020ed9ff0 R09: 0000000000000010
R10: 0000000020000010 R11: 0000000000000282 R12: 0000000000708000
R13: 0000000000000000 R14: 00007f6f7c7169c0 R15: 00007f6f7c716700
Code: 38 ca 7c 08 84 c9 0f 85 35 03 00 00 49 8d bf c2 00 00 00 66 89
83 a2 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f>
b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85
RIP: ping_v4_push_pending_frames net/ipv4/ping.c:647 [inline] RSP:
ffff880069bef8b8
RIP: ping_v4_sendmsg+0x1acd/0x23f0 net/ipv4/ping.c:837 RSP: ffff880069bef8b8
---[ end trace 13dad24b243d08a7 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Download attachment ".config" of type "application/octet-stream" (93007 bytes)

View attachment "ping-null-poc.c" of type "text/x-csrc" (6751 bytes)