net/sctp: stack-out-of-bounds in sctp_getsockopt
From: Baozeng Ding
Date: Tue Mar 22 2016 - 11:09:52 EST
Hi all,
The following program triggers an out-of-bounds bug in
sctp_getsockopt. The kernel version is 4.5 (on Mar 16
commit 09fd671ccb2475436bd5f597f751ca4a7d177aea).
==================================================================
BUG: KASAN: stack-out-of-bounds in string+0x1ef/0x200 at addr
ffff88003ae679e0
Read of size 1 by task syz-executor/19753
page:ffffea0000eb99c0 count:0 mapcount:0 mapping: (null)
index:0x0
flags: 0x1fffc0000000000()
page dumped because: kasan: bad access detected
CPU: 3 PID: 19753 Comm: syz-executor Not tainted 4.5.0+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
0000000000000003 ffff88003ae67578 ffffffff82945051 ffff88003ae67608
ffff88003ae679e0 0000000000000096 dffffc0000000000 ffff88003ae675f8
ffffffff81709f88 000000000000030d 0000000000000000 0000000000000286
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82945051>] dump_stack+0xb3/0x112 lib/dump_stack.c:51
[< inline >] print_address_description mm/kasan/report.c:150
[<ffffffff81709f88>] kasan_report_error+0x4f8/0x530 mm/kasan/report.c:236
[<ffffffff8140785b>] ? __lock_acquire+0x15fb/0x5dd0 kernel/locking/lockdep.c:3226
[< inline >] kasan_report mm/kasan/report.c:259
[<ffffffff81709ffe>] __asan_report_load1_noabort+0x3e/0x40 mm/kasan/report.c:277
[<ffffffff8296613f>] ? string+0x1ef/0x200 lib/vsprintf.c:591
[<ffffffff8296613f>] string+0x1ef/0x200 lib/vsprintf.c:591
[<ffffffff8296f103>] vsnprintf+0xb83/0x1900 lib/vsprintf.c:2049
[<ffffffff8296e580>] ? pointer+0xab0/0xab0 lib/vsprintf.c:1584
[<ffffffff813456f2>] __request_module+0x132/0x6b0 kernel/kmod.c:146
[<ffffffff814056b0>] ? mark_held_locks+0xd0/0x130 kernel/locking/lockdep.c:2552
[<ffffffff813455c0>] ? call_usermodehelper_setup+0x2b0/0x2b0 kernel/kmod.c:530
[<ffffffff85da47b0>] ? mutex_lock_interruptible_nested+0x980/0x980
[<ffffffff8168fed4>] ? __might_fault+0xe4/0x1d0 mm/memory.c:3833
[<ffffffff8538f74c>] find_inlist_lock.constprop.17+0x10c/0x210 net/bridge/netfilter/ebtables.c:347
[< inline >] find_table_lock net/bridge/netfilter/ebtables.c:356
[<ffffffff853904ab>] do_ebt_get_ctl+0x13b/0x540 net/bridge/netfilter/ebtables.c:1524
[<ffffffff85390370>] ? copy_everything_to_user+0x600/0x600 net/bridge/netfilter/ebtables.c:1455
[< inline >] ? __mutex_unlock_common_slowpath kernel/locking/mutex.c:751
[<ffffffff85da6799>] ? __mutex_unlock_slowpath+0x239/0x3f0 kernel/locking/mutex.c:762
[<ffffffff85da6959>] ? mutex_unlock+0x9/0x10 kernel/locking/mutex.c:437
[<ffffffff84dea126>] ? nf_sockopt_find+0x1a6/0x220 net/netfilter/nf_sockopt.c:87
[< inline >] nf_sockopt net/netfilter/nf_sockopt.c:103
[<ffffffff84dea20d>] nf_getsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:121
[<ffffffff84fadf05>] ip_getsockopt+0x135/0x190 net/ipv4/ip_sockglue.c:1523
[<ffffffff84faddd0>] ? do_ip_getsockopt+0x1520/0x1520 net/ipv4/ip_sockglue.c:1353
[< inline >] ? wake_up_process kernel/sched/core.c:2024
[<ffffffff8138bcc2>] ? wake_up_q+0x82/0xe0 kernel/sched/core.c:416
[< inline >] ? atomic_dec_and_test /arch/x86/include/asm/atomic.h:117
[< inline >] ? mmdrop include/linux/sched.h:2611
[<ffffffff814a3310>] ? drop_futex_key_refs.isra.13+0x70/0xe0 kernel/futex.c:444
[<ffffffff8583a4dd>] sctp_getsockopt+0x18d/0x3f40 net/sctp/socket.c:5964
[<ffffffff8140785b>] ? __lock_acquire+0x15fb/0x5dd0 kernel/locking/lockdep.c:3226
[<ffffffff8583a350>] ? sctp_do_peeloff+0x2b0/0x2b0 net/sctp/socket.c:4434
[<ffffffff81406260>] ? debug_check_no_locks_freed+0x290/0x290 kernel/locking/lockdep.c:4104
[< inline >] ? rcu_read_unlock include/linux/rcupdate.h:922
[<ffffffff817b398c>] ? __fget+0x20c/0x3b0 fs/file.c:712
[< inline >] ? rcu_lock_release include/linux/rcupdate.h:491
[< inline >] ? rcu_read_unlock include/linux/rcupdate.h:926
[<ffffffff817b39b5>] ? __fget+0x235/0x3b0 fs/file.c:712
[<ffffffff817b37c7>] ? __fget+0x47/0x3b0 fs/file.c:696
[<ffffffff817b3c11>] ? __fget_light+0xa1/0x1f0 fs/file.c:759
[<ffffffff84c3a695>] sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2579
[< inline >] SYSC_getsockopt net/socket.c:1783
[<ffffffff84c37e12>] SyS_getsockopt+0x142/0x230 net/socket.c:1765
[<ffffffff84c37cd0>] ? SyS_setsockopt+0x240/0x240 net/socket.c:1752
[<ffffffff85dab922>] ? entry_SYSCALL_64_fastpath+0x5/0xc1 arch/x86/entry/entry_64.S:191
[<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19 arch/x86/entry/thunk_64.S:39
[<ffffffff85dab940>] entry_SYSCALL_64_fastpath+0x23/0xc1 arch/x86/entry/entry_64.S:207
Memory state around the buggy address:
ffff88003ae67880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88003ae67900: 00 f1 f1 f1 f1 04 f4 f4 f4 f2 f2 f2 f2 00 00 00
>ffff88003ae67980: 00 00 00 00 00 00 00 00 00 00 00 00 f4 f3 f3 f3
^
ffff88003ae67a00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88003ae67a80: f1 f1 f1 f1 04 f4 f4 f4 f3 f3 f3 f3 00 00 00 00
==================================================================
#include <unistd.h>
#include <sys/syscall.h>
#include <netinet/in.h>
#include <string.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/socket.h>
int main()
{
int sock = 0;
int sock_dup = 0;
mmap((void *)0x20000000ul, 0x5000ul, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
sock = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
sock_dup = dup(sock);
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bf\x5c\xe8\x18\x3d\x7f\x0e\x2f\xe9\x06\xf9\xb6\xcc\x60\xcc\x38\x6c\x9a\x78\xa7\x7c\x61",
1037);
getsockopt(sock_dup, IPPROTO_IP, 0x81, (void *)0x20000bf3ul,
(socklen_t *)0x20003000ul);
return 0;
}
Best Regards,
Baozeng Ding