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Date: Tue, 24 Nov 2015 15:45:54 -0500
From: Neil Horman <nhorman@...driver.com>
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Vladislav Yasevich <vyasevich@...il.com>,
linux-sctp@...r.kernel.org, netdev <netdev@...r.kernel.org>,
syzkaller <syzkaller@...glegroups.com>,
Kostya Serebryany <kcc@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Sasha Levin <sasha.levin@...cle.com>,
Eric Dumazet <edumazet@...gle.com>,
Maciej Żenczykowski <maze@...gle.com>
Subject: Re: use-after-free in sctp_do_sm
On Tue, Nov 24, 2015 at 11:10:32AM +0100, Dmitry Vyukov wrote:
> On Tue, Nov 24, 2015 at 10:31 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > On Tue, Nov 24, 2015 at 10:15 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> >> Hello,
> >>
> >> The following program triggers use-after-free in sctp_do_sm:
> >>
> >> // autogenerated by syzkaller (http://github.com/google/syzkaller)
> >> #include <syscall.h>
> >> #include <string.h>
> >> #include <stdint.h>
> >>
> >> int main()
> >> {
> >> long r0 = syscall(SYS_socket, 0xaul, 0x80805ul, 0x0ul, 0, 0, 0);
> >> long r1 = syscall(SYS_mmap, 0x20000000ul, 0x10000ul, 0x3ul,
> >> 0x32ul, 0xfffffffffffffffful, 0x0ul);
> >> memcpy((void*)0x20002fe4,
> >> "\x0a\x00\x33\xe7\xeb\x9d\xcf\x61\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xc5\xc8\x88\x64",
> >> 28);
> >> long r3 = syscall(SYS_bind, r0, 0x20002fe4ul, 0x1cul, 0, 0, 0);
> >> memcpy((void*)0x20000faa,
> >> "\x9b\x01\x7d\xcd\xb8\x6a\xc7\x3d\x09\x3a\x07\x00\xa7\xc4\xe9\xee\x0a\xd6\xec\xde\x26\x75\x5f\x22\xae\x4e\x33\x00\xb0\x76\x10\x70\xd6\xca\x19\xbc\x15\x83\xcf\x2e\xbc\x99\x0c\x5e\x83\x89\xc1\x44\x9c\x6e\x74\xd8\x5d\x5d\xd0\xf0\xdf\x47\xc0\x00\x71\x0b\x55\x4c\xab\xf0\xd8\x90\xd5\x92\x8c\x6e\x33\x22\x15\x5b\x19\xfb\xed\xdd\xa6\xac\xcb\x60\xcf\xe2\xde\xed\xdb\x95\x5c\xaa\x20\xa3",
> >> 94);
> >> memcpy((void*)0x2000033a,
> >> "\x02\x00\x33\xe2\x7f\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
> >> 128);
> >> long r6 = syscall(SYS_sendto, r0, 0x20000faaul, 0x5eul,
> >> 0x81ul, 0x2000033aul, 0x80ul);
> >> return 0;
> >> }
> >>
> >>
> >> ==================================================================
> >> BUG: KASAN: use-after-free in sctp_do_sm+0x42f6/0x4f60 at addr ffff880036fa80a8
> >> Read of size 4 by task a.out/5664
> >> =============================================================================
> >> BUG kmalloc-4096 (Tainted: G B ): kasan: bad access detected
> >> -----------------------------------------------------------------------------
> >>
> >> INFO: Allocated in sctp_association_new+0x6f/0x1ea0 age=8 cpu=1 pid=5664
> >> [< none >] kmem_cache_alloc_trace+0x1cf/0x220 ./mm/slab.c:3707
> >> [< none >] sctp_association_new+0x6f/0x1ea0
> >> [< none >] sctp_sendmsg+0x1954/0x28e0
> >> [< none >] inet_sendmsg+0x316/0x4f0 ./net/ipv4/af_inet.c:802
> >> [< inline >] __sock_sendmsg_nosec ./net/socket.c:641
> >> [< inline >] __sock_sendmsg ./net/socket.c:651
> >> [< none >] sock_sendmsg+0xca/0x110 ./net/socket.c:662
> >> [< none >] SYSC_sendto+0x208/0x350 ./net/socket.c:1841
> >> [< none >] SyS_sendto+0x40/0x50 ./net/socket.c:1862
> >> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a
> >>
> >> INFO: Freed in sctp_association_put+0x150/0x250 age=14 cpu=1 pid=5664
> >> [< none >] kfree+0x199/0x1b0 ./mm/slab.c:1211
> >> [< none >] sctp_association_put+0x150/0x250
> >> [< none >] sctp_association_free+0x498/0x630
> >> [< none >] sctp_do_sm+0xd8b/0x4f60
> >> [< none >] sctp_primitive_SHUTDOWN+0xa9/0xd0
> >> [< none >] sctp_close+0x616/0x790
> >> [< none >] inet_release+0xed/0x1c0 ./net/ipv4/af_inet.c:471
> >> [< none >] inet6_release+0x50/0x70 ./net/ipv6/af_inet6.c:416
> >> [< inline >] constant_test_bit ././arch/x86/include/asm/bitops.h:321
> >> [< none >] sock_release+0x8d/0x200 ./net/socket.c:601
> >> [< none >] sock_close+0x16/0x20 ./net/socket.c:1188
> >> [< none >] __fput+0x21d/0x6e0 ./fs/file_table.c:265
> >> [< none >] ____fput+0x15/0x20 ./fs/file_table.c:84
> >> [< none >] task_work_run+0x163/0x1f0 ./include/trace/events/rcu.h:20
> >> [< inline >] __list_add ./include/linux/list.h:42
> >> [< inline >] list_add_tail ./include/linux/list.h:76
> >> [< inline >] list_move_tail ./include/linux/list.h:168
> >> [< inline >] reparent_leader ./kernel/exit.c:618
> >> [< inline >] forget_original_parent ./kernel/exit.c:669
> >> [< inline >] exit_notify ./kernel/exit.c:697
> >> [< none >] do_exit+0x809/0x2b90 ./kernel/exit.c:878
> >> [< none >] do_group_exit+0x108/0x320 ./kernel/exit.c:985
> >>
> >> INFO: Slab 0xffffea0000dbea00 objects=7 used=1 fp=0xffff880036fa8000
> >> flags=0x100000000004080
> >> INFO: Object 0xffff880036fa8000 @offset=0 fp=0xffff880036fad668
> >> CPU: 1 PID: 5664 Comm: a.out Tainted: G B 4.4.0-rc1+ #81
> >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> >> 00000000ffffffff ffff880061d6f700 ffffffff825d3336 ffff88003e806d00
> >> ffff880036fa8000 ffff880036fa8000 ffff880061d6f730 ffffffff81618784
> >> ffff88003e806d00 ffffea0000dbea00 ffff880036fa8000 0000000000000000
> >>
> >> Call Trace:
> >> [<ffffffff8162131e>] __asan_report_load4_noabort+0x3e/0x40
> >> [<ffffffff8475ac76>] sctp_do_sm+0x42f6/0x4f60
> >> [<ffffffff847b50e9>] sctp_primitive_SHUTDOWN+0xa9/0xd0
> >> [<ffffffff847a1426>] sctp_close+0x616/0x790
> >> [<ffffffff8409bb0d>] inet_release+0xed/0x1c0 ./net/ipv4/af_inet.c:471
> >> [<ffffffff84192cc0>] inet6_release+0x50/0x70 ./net/ipv6/af_inet6.c:416
> >> [< inline >] constant_test_bit ././arch/x86/include/asm/bitops.h:321
> >> [<ffffffff83dc78cd>] sock_release+0x8d/0x200 ./net/socket.c:601
> >> [<ffffffff83dc7a56>] sock_close+0x16/0x20 ./net/socket.c:1188
> >> [<ffffffff81662f5d>] __fput+0x21d/0x6e0 ./fs/file_table.c:265
> >> [<ffffffff816634a5>] ____fput+0x15/0x20 ./fs/file_table.c:84
> >> [<ffffffff812a33d3>] task_work_run+0x163/0x1f0 ./include/trace/events/rcu.h:20
> >> [< inline >] __list_add ./include/linux/list.h:42
> >> [< inline >] list_add_tail ./include/linux/list.h:76
> >> [< inline >] list_move_tail ./include/linux/list.h:168
> >> [< inline >] reparent_leader ./kernel/exit.c:618
> >> [< inline >] forget_original_parent ./kernel/exit.c:669
> >> [< inline >] exit_notify ./kernel/exit.c:697
> >> [<ffffffff812505d9>] do_exit+0x809/0x2b90 ./kernel/exit.c:878
> >> [<ffffffff81252ad8>] do_group_exit+0x108/0x320 ./kernel/exit.c:985
> >> [<ffffffff81252d0d>] SyS_exit_group+0x1d/0x20 ./kernel/exit.c:1002
> >> [<ffffffff84bf0c36>] entry_SYSCALL_64_fastpath+0x16/0x7a
> >> ==================================================================
> >>
> >>
> >> I am on commit 90b55590c43258a157a2a143748455dcc50fbb53 of net-next (Nov 22).
>
> The right commit is:
>
> commit 7d267278a9ece963d77eefec61630223fce08c6c
> Author: Rainer Weikusat
> Date: Fri Nov 20 22:07:23 2015 +0000
> unix: avoid use-after-free in ep_remove_wait_queue
This commit doesn't seem to exist
Neil
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