* KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32
@ 2020-10-23 8:38 syzbot
[not found] ` <20201028090022.2757-1-hdanton@sina.com>
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: syzbot @ 2020-10-23 8:38 UTC (permalink / raw)
To: davem, herbert, kuba, linux-kernel, netdev, steffen.klassert,
syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: c4d6fe73 Merge tag 'xarray-5.9' of git://git.infradead.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1117ff78500000
kernel config: https://syzkaller.appspot.com/x/.config?x=5e8379456358b93c
dashboard link: https://syzkaller.appspot.com/bug?extid=c43831072e7df506a646
compiler: gcc (GCC) 10.1.0-syz 20200507
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c43831072e7df506a646@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in memset include/linux/string.h:384 [inline]
BUG: KASAN: slab-out-of-bounds in xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393
Write of size 4 at addr ffff88801c57e6c0 by task syz-executor.0/9498
CPU: 1 PID: 9498 Comm: syz-executor.0 Not tainted 5.9.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385
__kasan_report mm/kasan/report.c:545 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
check_memory_region_inline mm/kasan/generic.c:186 [inline]
check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
memset+0x20/0x40 mm/kasan/common.c:84
memset include/linux/string.h:384 [inline]
xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393
xfrm_xlate32_attr net/xfrm/xfrm_compat.c:426 [inline]
xfrm_xlate32 net/xfrm/xfrm_compat.c:525 [inline]
xfrm_user_rcv_msg_compat+0x76b/0x1040 net/xfrm/xfrm_compat.c:570
xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
___sys_sendmsg+0xf3/0x170 net/socket.c:2407
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
__do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f86549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55800bc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200001c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 9498:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
kmalloc_node include/linux/slab.h:577 [inline]
kvmalloc_node+0x61/0xf0 mm/util.c:575
kvmalloc include/linux/mm.h:765 [inline]
xfrm_user_rcv_msg_compat+0x3cd/0x1040 net/xfrm/xfrm_compat.c:566
xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
___sys_sendmsg+0xf3/0x170 net/socket.c:2407
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
__do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
Last call_rcu():
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346
__call_rcu kernel/rcu/tree.c:2953 [inline]
call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027
nf_hook_entries_free net/netfilter/core.c:88 [inline]
nf_hook_entries_free net/netfilter/core.c:75 [inline]
__nf_register_net_hook+0x2aa/0x610 net/netfilter/core.c:424
nf_register_net_hook+0x114/0x170 net/netfilter/core.c:541
nf_register_net_hooks+0x59/0xc0 net/netfilter/core.c:557
ip6t_register_table+0x235/0x2f0 net/ipv6/netfilter/ip6_tables.c:1757
ip6table_security_table_init net/ipv6/netfilter/ip6table_security.c:58 [inline]
ip6table_security_table_init+0x82/0xc0 net/ipv6/netfilter/ip6table_security.c:47
xt_find_table_lock+0x2d4/0x540 net/netfilter/x_tables.c:1223
xt_request_find_table_lock+0x27/0xf0 net/netfilter/x_tables.c:1253
get_info+0x16a/0x740 net/ipv6/netfilter/ip6_tables.c:980
do_ip6t_get_ctl+0x152/0xa10 net/ipv6/netfilter/ip6_tables.c:1660
nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x1be/0x270 net/ipv6/ipv6_sockglue.c:1486
tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3880
__sys_getsockopt+0x219/0x4c0 net/socket.c:2173
__do_compat_sys_socketcall+0x513/0x660 net/compat.c:495
do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
__do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
The buggy address belongs to the object at ffff88801c57e600
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes to the right of
192-byte region [ffff88801c57e600, ffff88801c57e6c0)
The buggy address belongs to the page:
page:00000000d5f129f9 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801c57eb00 pfn:0x1c57e
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffff888010041140 ffffea00008066c8 ffff888010040000
raw: ffff88801c57eb00 ffff88801c57e000 000000010000000b 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801c57e580: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88801c57e600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801c57e680: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
^
ffff88801c57e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801c57e780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
---
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^ permalink raw reply [flat|nested] 4+ messages in thread[parent not found: <20201028090022.2757-1-hdanton@sina.com>]
* Re: KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32 [not found] ` <20201028090022.2757-1-hdanton@sina.com> @ 2020-10-28 10:43 ` Steffen Klassert 0 siblings, 0 replies; 4+ messages in thread From: Steffen Klassert @ 2020-10-28 10:43 UTC (permalink / raw) To: Hillf Danton, Dmitry Safonov Cc: syzbot, davem, herbert, kuba, linux-kernel, netdev, syzkaller-bugs Dimitry, you added this code, can you please look into that? Thanks! On Wed, Oct 28, 2020 at 05:00:22PM +0800, Hillf Danton wrote: > On Fri, 23 Oct 2020 01:38:23 -0700 > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: c4d6fe73 Merge tag 'xarray-5.9' of git://git.infradead.org.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=1117ff78500000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5e8379456358b93c > > dashboard link: https://syzkaller.appspot.com/bug?extid=c43831072e7df506a646 > > compiler: gcc (GCC) 10.1.0-syz 20200507 > > userspace arch: i386 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+c43831072e7df506a646@syzkaller.appspotmail.com > > > > ================================================================== > > BUG: KASAN: slab-out-of-bounds in memset include/linux/string.h:384 [inline] > > BUG: KASAN: slab-out-of-bounds in xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393 > > Write of size 4 at addr ffff88801c57e6c0 by task syz-executor.0/9498 > > > > CPU: 1 PID: 9498 Comm: syz-executor.0 Not tainted 5.9.0-syzkaller #0 > > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0x107/0x163 lib/dump_stack.c:118 > > print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385 > > __kasan_report mm/kasan/report.c:545 [inline] > > kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 > > check_memory_region_inline mm/kasan/generic.c:186 [inline] > > check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 > > memset+0x20/0x40 mm/kasan/common.c:84 > > memset include/linux/string.h:384 [inline] > > xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393 > > xfrm_xlate32_attr net/xfrm/xfrm_compat.c:426 [inline] > > xfrm_xlate32 net/xfrm/xfrm_compat.c:525 [inline] > > xfrm_user_rcv_msg_compat+0x76b/0x1040 net/xfrm/xfrm_compat.c:570 > > xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714 > > netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 > > xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764 > > netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] > > netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 > > netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 > > sock_sendmsg_nosec net/socket.c:651 [inline] > > sock_sendmsg+0xcf/0x120 net/socket.c:671 > > ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 > > ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 > > __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 > > do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] > > __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 > > do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 > > entry_SYSENTER_compat_after_hwframe+0x4d/0x5c > > RIP: 0023:0xf7f86549 > > Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 > > RSP: 002b:00000000f55800bc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 > > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200001c0 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > > > > Allocated by task 9498: > > kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 > > kasan_set_track mm/kasan/common.c:56 [inline] > > __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 > > kmalloc_node include/linux/slab.h:577 [inline] > > kvmalloc_node+0x61/0xf0 mm/util.c:575 > > kvmalloc include/linux/mm.h:765 [inline] > > xfrm_user_rcv_msg_compat+0x3cd/0x1040 net/xfrm/xfrm_compat.c:566 > > xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714 > > netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 > > xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764 > > netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] > > netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 > > netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 > > sock_sendmsg_nosec net/socket.c:651 [inline] > > sock_sendmsg+0xcf/0x120 net/socket.c:671 > > ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 > > ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 > > __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 > > do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] > > __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 > > do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 > > entry_SYSENTER_compat_after_hwframe+0x4d/0x5c > > > > Last call_rcu(): > > kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 > > kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 > > __call_rcu kernel/rcu/tree.c:2953 [inline] > > call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027 > > nf_hook_entries_free net/netfilter/core.c:88 [inline] > > nf_hook_entries_free net/netfilter/core.c:75 [inline] > > __nf_register_net_hook+0x2aa/0x610 net/netfilter/core.c:424 > > nf_register_net_hook+0x114/0x170 net/netfilter/core.c:541 > > nf_register_net_hooks+0x59/0xc0 net/netfilter/core.c:557 > > ip6t_register_table+0x235/0x2f0 net/ipv6/netfilter/ip6_tables.c:1757 > > ip6table_security_table_init net/ipv6/netfilter/ip6table_security.c:58 [inline] > > ip6table_security_table_init+0x82/0xc0 net/ipv6/netfilter/ip6table_security.c:47 > > xt_find_table_lock+0x2d4/0x540 net/netfilter/x_tables.c:1223 > > xt_request_find_table_lock+0x27/0xf0 net/netfilter/x_tables.c:1253 > > get_info+0x16a/0x740 net/ipv6/netfilter/ip6_tables.c:980 > > do_ip6t_get_ctl+0x152/0xa10 net/ipv6/netfilter/ip6_tables.c:1660 > > nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 > > ipv6_getsockopt+0x1be/0x270 net/ipv6/ipv6_sockglue.c:1486 > > tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3880 > > __sys_getsockopt+0x219/0x4c0 net/socket.c:2173 > > __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495 > > do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] > > __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 > > do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 > > entry_SYSENTER_compat_after_hwframe+0x4d/0x5c > > > > The buggy address belongs to the object at ffff88801c57e600 > > which belongs to the cache kmalloc-192 of size 192 > > The buggy address is located 0 bytes to the right of > > 192-byte region [ffff88801c57e600, ffff88801c57e6c0) > > The buggy address belongs to the page: > > page:00000000d5f129f9 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801c57eb00 pfn:0x1c57e > > flags: 0xfff00000000200(slab) > > raw: 00fff00000000200 ffff888010041140 ffffea00008066c8 ffff888010040000 > > raw: ffff88801c57eb00 ffff88801c57e000 000000010000000b 0000000000000000 > > page dumped because: kasan: bad access detected > > > > Memory state around the buggy address: > > ffff88801c57e580: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc > > ffff88801c57e600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > >ffff88801c57e680: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc > > ^ > > ffff88801c57e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff88801c57e780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > > ================================================================== > > Check bound after updating pos and before clearing memory. > > --- a/net/xfrm/xfrm_compat.c > +++ b/net/xfrm/xfrm_compat.c > @@ -376,6 +376,7 @@ static int xfrm_attr_cpy32(void *dst, si > { > struct nlmsghdr *nlmsg = dst; > struct nlattr *nla; > + int len; > > if (WARN_ON_ONCE(copy_len > payload)) > copy_len = payload; > @@ -390,7 +391,10 @@ static int xfrm_attr_cpy32(void *dst, si > *pos += nla_attr_size(payload); > nlmsg->nlmsg_len += nla->nla_len; > > - memset(dst + *pos, 0, payload - copy_len); > + len = payload - copy_len; > + if (size - *pos < len) > + len = size - *pos; > + memset(dst + *pos, 0, len); > *pos += payload - copy_len; > > return 0; ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32 2020-10-23 8:38 KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32 syzbot [not found] ` <20201028090022.2757-1-hdanton@sina.com> @ 2020-11-02 4:22 ` syzbot 2020-11-02 7:23 ` syzbot 2 siblings, 0 replies; 4+ messages in thread From: syzbot @ 2020-11-02 4:22 UTC (permalink / raw) To: 0x7f454c46, davem, dima, hdanton, herbert, kuba, linux-kernel, netdev, steffen.klassert, syzkaller-bugs syzbot has found a reproducer for the following issue on: HEAD commit: 3cea11cd Linux 5.10-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16baaf46500000 kernel config: https://syzkaller.appspot.com/x/.config?x=61033507391c77ff dashboard link: https://syzkaller.appspot.com/bug?extid=c43831072e7df506a646 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1388676c500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158f642c500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c43831072e7df506a646@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in memset include/linux/string.h:384 [inline] BUG: KASAN: slab-out-of-bounds in xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393 Write of size 4 at addr ffff888147aba4fc by task syz-executor829/8497 CPU: 0 PID: 8497 Comm: syz-executor829 Not tainted 5.10.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 memset+0x20/0x40 mm/kasan/common.c:84 memset include/linux/string.h:384 [inline] xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393 xfrm_xlate32_attr net/xfrm/xfrm_compat.c:426 [inline] xfrm_xlate32 net/xfrm/xfrm_compat.c:525 [inline] xfrm_user_rcv_msg_compat+0x76b/0x1040 net/xfrm/xfrm_compat.c:570 xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fb2549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ffdebbcc EFLAGS: 00000246 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000080 RDX: 0000000000000000 RSI: 00000000080ea078 RDI: 00000000ffdebc20 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8497: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:575 kvmalloc include/linux/mm.h:765 [inline] xfrm_user_rcv_msg_compat+0x3cd/0x1040 net/xfrm/xfrm_compat.c:566 xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2953 [inline] call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027 rhashtable_rehash_table lib/rhashtable.c:345 [inline] rht_deferred_worker+0x10f4/0x1d40 lib/rhashtable.c:429 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff888147aba400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 252 bytes inside of 256-byte region [ffff888147aba400, ffff888147aba500) The buggy address belongs to the page: page:00000000e11e2d62 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888147abbe00 pfn:0x147aba head:00000000e11e2d62 order:1 compound_mapcount:0 flags: 0x57ff00000010200(slab|head) raw: 057ff00000010200 ffffea000084e900 0000000700000007 ffff8880100413c0 raw: ffff888147abbe00 000000008010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888147aba380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888147aba400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888147aba480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 ^ ffff888147aba500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888147aba580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32 2020-10-23 8:38 KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32 syzbot [not found] ` <20201028090022.2757-1-hdanton@sina.com> 2020-11-02 4:22 ` syzbot @ 2020-11-02 7:23 ` syzbot 2 siblings, 0 replies; 4+ messages in thread From: syzbot @ 2020-11-02 7:23 UTC (permalink / raw) To: 0x7f454c46, andriin, ast, bpf, daniel, davem, dima, hdanton, herbert, john.fastabend, kafai, kpsingh, kuba, linux-kernel, mkubecek, netdev, songliubraving, steffen.klassert, syzkaller-bugs, yhs syzbot has bisected this issue to: commit 5106f4a8acff480e244300bc5097c0ad7048c3a2 Author: Dmitry Safonov <dima@arista.com> Date: Mon Sep 21 14:36:55 2020 +0000 xfrm/compat: Add 32=>64-bit messages translator bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16cefa8a500000 start commit: 3cea11cd Linux 5.10-rc2 git tree: upstream final oops: https://syzkaller.appspot.com/x/report.txt?x=15cefa8a500000 console output: https://syzkaller.appspot.com/x/log.txt?x=11cefa8a500000 kernel config: https://syzkaller.appspot.com/x/.config?x=61033507391c77ff dashboard link: https://syzkaller.appspot.com/bug?extid=c43831072e7df506a646 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1388676c500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158f642c500000 Reported-by: syzbot+c43831072e7df506a646@syzkaller.appspotmail.com Fixes: 5106f4a8acff ("xfrm/compat: Add 32=>64-bit messages translator") For information about bisection process see: https://goo.gl/tpsmEJ#bisection ^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-10-23 8:38 KASAN: slab-out-of-bounds Write in xfrm_attr_cpy32 syzbot
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2020-10-28 10:43 ` Steffen Klassert
2020-11-02 4:22 ` syzbot
2020-11-02 7:23 ` syzbot
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