linux-kernel - net/bonding: stack-out-of-bounds in bond

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Message-ID: <CAAeHK+zNAbwp3MNOq1WUSxHw2Yx-K=v1KzJH38dY=A88gFsbAg@mail.gmail.com>
Date:   Thu, 20 Apr 2017 18:32:07 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: net/bonding: stack-out-of-bounds in bond_enslave

Hi,

I've got the following error report while fuzzing the kernel with syzkaller.

On linux-next commit 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (4.11-rc7).

A reproducer and .config are attached.

==================================================================
BUG: KASAN: stack-out-of-bounds in bond_enslave+0xe0a/0x4ef0 at addr
ffff8800666b7792
Write of size 16 by task a.out/3894
page:ffffea000199adc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea000199ade0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected
CPU: 1 PID: 3894 Comm: a.out Not tainted 4.11.0-rc7+ #251
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16
 dump_stack+0x292/0x398 lib/dump_stack.c:52
 kasan_report_error mm/kasan/report.c:212
 kasan_report+0x4d8/0x510 mm/kasan/report.c:347
 check_memory_region_inline mm/kasan/kasan.c:326
 check_memory_region+0x139/0x190 mm/kasan/kasan.c:333
 memcpy+0x37/0x50 mm/kasan/kasan.c:369
 bond_enslave+0xe0a/0x4ef0 drivers/net/bonding/bond_main.c:1491
 bond_do_ioctl+0xb5d/0xec0 drivers/net/bonding/bond_main.c:3449
 dev_ifsioc+0x53f/0x9f0 net/core/dev_ioctl.c:338
 dev_ioctl+0x249/0x1160 net/core/dev_ioctl.c:532
 sock_do_ioctl+0x94/0xb0 net/socket.c:913
 sock_ioctl+0x28f/0x440 net/socket.c:1004
 vfs_ioctl fs/ioctl.c:45
 do_vfs_ioctl+0x1bf/0x1780 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:204
RIP: 0033:0x7fc764b31b79
RSP: 002b:00007ffc1d73aa58 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffc1d73abb0 RCX: 00007fc764b31b79
RDX: 00000000209eafd8 RSI: 0000008000008990 RDI: 0000000000000003
RBP: 00000000004004e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffc1d73abb0 R14: 0000000000000000 R15: 0000000000000000
Memory state around the buggy address:
 ffff8800666b7680: f2 f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2
 ffff8800666b7700: f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2
>ffff8800666b7780: f2 f2 00 00 f2 f2 f3 f3 f3 f3 00 00 00 00 00 00
                               ^
 ffff8800666b7800: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2
 ffff8800666b7880: f2 f2 f2 f2 00 04 f2 f2 f2 f2 f2 f2 00 00 00 f2
==================================================================

View attachment "bond_enslave-oob-poc.c" of type "text/x-csrc" (2088 bytes)

Download attachment ".config" of type "application/octet-stream" (127239 bytes)