KASAN: use-after-free Read in tipc_udp_nl_dump_remoteip (2)
12 views
Skip to first unread message
syzbot
Jun 22, 2020, 12:37:11 PM6/22/20
to da...@davemloft.net, jma...@redhat.com, ku...@kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, syzkall...@googlegroups.com, tipc-di...@lists.sourceforge.net, ying...@windriver.com
Hello,
syzbot found the following crash on:
HEAD commit: 67c20de3 net: Add MODULE_DESCRIPTION entries to network mo..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=13ff86a5100000
kernel config: https://syzkaller.appspot.com/x/.config?x=45c80de7244166e1
dashboard link: https://syzkaller.appspot.com/bug?extid=3039ddf6d7b13daf3787
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1126c695100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122afe35100000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3039dd...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
BUG: KASAN: use-after-free in tipc_udp_nl_dump_remoteip+0xb92/0xba0 net/tipc/udp_media.c:467
Read of size 2 at addr ffff8880a7da0c14 by task syz-executor132/7030
CPU: 0 PID: 7030 Comm: syz-executor132 Not tainted 5.8.0-rc1-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+0x18f/0x20d lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
tipc_udp_nl_dump_remoteip+0xb92/0xba0 net/tipc/udp_media.c:467
genl_lock_dumpit+0x7f/0xb0 net/netlink/genetlink.c:575
netlink_dump+0x50b/0xe70 net/netlink/af_netlink.c:2245
__netlink_dump_start+0x63f/0x910 net/netlink/af_netlink.c:2353
genl_family_rcv_msg_dumpit.isra.0+0x296/0x300 net/netlink/genetlink.c:638
genl_family_rcv_msg net/netlink/genetlink.c:733 [inline]
genl_rcv_msg+0x781/0x9c0 net/netlink/genetlink.c:753
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
genl_rcv+0x24/0x40 net/netlink/genetlink.c:764
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
___sys_sendmsg+0x100/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4452c9
Code: Bad RIP value.
RSP: 002b:00007ffd2abff858 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452c9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 000000000000f7f6 R08: 0000000000000000 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402460
R13: 00000000004024f0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 7032:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc mm/kasan/common.c:494 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
__kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142
__alloc_skb+0xef/0x5a0 net/core/skbuff.c:210
alloc_skb include/linux/skbuff.h:1083 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
netlink_sendmsg+0x97b/0xe10 net/netlink/af_netlink.c:1893
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
___sys_sendmsg+0x100/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 7032:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
kasan_set_free_info mm/kasan/common.c:316 [inline]
__kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455
__cache_free mm/slab.c:3426 [inline]
kfree+0x109/0x2b0 mm/slab.c:3757
skb_free_head+0x8b/0xa0 net/core/skbuff.c:590
skb_release_data+0x617/0x8a0 net/core/skbuff.c:610
skb_release_all+0x46/0x60 net/core/skbuff.c:664
__kfree_skb net/core/skbuff.c:678 [inline]
consume_skb net/core/skbuff.c:837 [inline]
consume_skb+0xf3/0x3f0 net/core/skbuff.c:831
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x53f/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
___sys_sendmsg+0x100/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff8880a7da0c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 20 bytes inside of
512-byte region [ffff8880a7da0c00, ffff8880a7da0e00)
The buggy address belongs to the page:
page:ffffea00029f6800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000261b188 ffffea0002884808 ffff8880aa000a80
raw: 0000000000000000 ffff8880a7da0000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a7da0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a7da0b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a7da0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a7da0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a7da0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: 67c20de3 net: Add MODULE_DESCRIPTION entries to network mo..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=13ff86a5100000
kernel config: https://syzkaller.appspot.com/x/.config?x=45c80de7244166e1
dashboard link: https://syzkaller.appspot.com/bug?extid=3039ddf6d7b13daf3787
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1126c695100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122afe35100000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3039dd...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
BUG: KASAN: use-after-free in tipc_udp_nl_dump_remoteip+0xb92/0xba0 net/tipc/udp_media.c:467
Read of size 2 at addr ffff8880a7da0c14 by task syz-executor132/7030
CPU: 0 PID: 7030 Comm: syz-executor132 Not tainted 5.8.0-rc1-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+0x18f/0x20d lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
tipc_udp_nl_dump_remoteip+0xb92/0xba0 net/tipc/udp_media.c:467
genl_lock_dumpit+0x7f/0xb0 net/netlink/genetlink.c:575
netlink_dump+0x50b/0xe70 net/netlink/af_netlink.c:2245
__netlink_dump_start+0x63f/0x910 net/netlink/af_netlink.c:2353
genl_family_rcv_msg_dumpit.isra.0+0x296/0x300 net/netlink/genetlink.c:638
genl_family_rcv_msg net/netlink/genetlink.c:733 [inline]
genl_rcv_msg+0x781/0x9c0 net/netlink/genetlink.c:753
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
genl_rcv+0x24/0x40 net/netlink/genetlink.c:764
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
___sys_sendmsg+0x100/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4452c9
Code: Bad RIP value.
RSP: 002b:00007ffd2abff858 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452c9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 000000000000f7f6 R08: 0000000000000000 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402460
R13: 00000000004024f0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 7032:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc mm/kasan/common.c:494 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
__kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142
__alloc_skb+0xef/0x5a0 net/core/skbuff.c:210
alloc_skb include/linux/skbuff.h:1083 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
netlink_sendmsg+0x97b/0xe10 net/netlink/af_netlink.c:1893
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
___sys_sendmsg+0x100/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 7032:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
kasan_set_free_info mm/kasan/common.c:316 [inline]
__kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455
__cache_free mm/slab.c:3426 [inline]
kfree+0x109/0x2b0 mm/slab.c:3757
skb_free_head+0x8b/0xa0 net/core/skbuff.c:590
skb_release_data+0x617/0x8a0 net/core/skbuff.c:610
skb_release_all+0x46/0x60 net/core/skbuff.c:664
__kfree_skb net/core/skbuff.c:678 [inline]
consume_skb net/core/skbuff.c:837 [inline]
consume_skb+0xf3/0x3f0 net/core/skbuff.c:831
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x53f/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
___sys_sendmsg+0x100/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff8880a7da0c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 20 bytes inside of
512-byte region [ffff8880a7da0c00, ffff8880a7da0e00)
The buggy address belongs to the page:
page:ffffea00029f6800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000261b188 ffffea0002884808 ffff8880aa000a80
raw: 0000000000000000 ffff8880a7da0000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a7da0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a7da0b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a7da0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a7da0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a7da0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot
Jun 25, 2020, 1:35:04 PM6/25/20
to syzkall...@googlegroups.com, xiyou.w...@gmail.com
Hello,
syzbot has tested the proposed patch but the reproducer still triggered crash:
KASAN: use-after-free Read in tipc_udp_nl_dump_remoteip
==================================================================
BUG: KASAN: use-after-free in nla_len include/net/netlink.h:1135 [inline]
Read of size 2 at addr ffff88808337a814 by task syz-executor.0/8380
CPU: 0 PID: 8380 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0
nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
tipc_udp_nl_dump_remoteip+0xb8f/0xba0 net/tipc/udp_media.c:467
genl_lock_dumpit+0x7f/0xb0 net/netlink/genetlink.c:575
netlink_dump+0x479/0xeb0 net/netlink/af_netlink.c:2246
__netlink_dump_start+0x610/0x900 net/netlink/af_netlink.c:2348
genl_family_rcv_msg_dumpit+0x2ac/0x310 net/netlink/genetlink.c:638
genl_family_rcv_msg net/netlink/genetlink.c:733 [inline]
genl_rcv_msg+0x797/0x9e0 net/netlink/genetlink.c:753
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2466
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
Code: Bad RIP value.
RSP: 002b:00007f315bdc2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000005017e0 RCX: 000000000045ca59
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a15 R14: 00000000004d69a8 R15: 00007f315bdc36d4
Allocated by task 8381:
__kmalloc_reserve net/core/skbuff.c:142 [inline]
__alloc_skb+0xae/0x550 net/core/skbuff.c:210
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__cache_free mm/slab.c:3426 [inline]
kfree+0x103/0x2c0 mm/slab.c:3757
skb_free_head net/core/skbuff.c:590 [inline]
skb_release_data+0x6d9/0x910 net/core/skbuff.c:610
skb_release_all net/core/skbuff.c:664 [inline]
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x53b/0x7d0 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00020cd388 ffffea00024a8108 ffff8880aa000a80
raw: 0000000000000000 ffff88808337a000 0000000100000004 0000000000000000
ffff88808337a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88808337a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88808337a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808337a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 472fd78c netlink: avoid interrupting critical section
git tree: https://github.com/congwang/linux.git net
console output: https://syzkaller.appspot.com/x/log.txt?x=11249519100000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcc6334acae363d4
dashboard link: https://syzkaller.appspot.com/bug?extid=3039ddf6d7b13daf3787
compiler: gcc (GCC) 10.1.0-syz 20200507
syzbot has tested the proposed patch but the reproducer still triggered crash:
KASAN: use-after-free Read in tipc_udp_nl_dump_remoteip
==================================================================
BUG: KASAN: use-after-free in nla_len include/net/netlink.h:1135 [inline]
BUG: KASAN: use-after-free in nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
BUG: KASAN: use-after-free in tipc_udp_nl_dump_remoteip+0xb8f/0xba0 net/tipc/udp_media.c:467
Read of size 2 at addr ffff88808337a814 by task syz-executor.0/8380
CPU: 0 PID: 8380 Comm: syz-executor.0 Not tainted 5.8.0-rc1-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+0x18f/0x20d lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
nla_len include/net/netlink.h:1135 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
nla_parse_nested_deprecated include/net/netlink.h:1218 [inline]
tipc_udp_nl_dump_remoteip+0xb8f/0xba0 net/tipc/udp_media.c:467
genl_lock_dumpit+0x7f/0xb0 net/netlink/genetlink.c:575
netlink_dump+0x479/0xeb0 net/netlink/af_netlink.c:2246
__netlink_dump_start+0x610/0x900 net/netlink/af_netlink.c:2348
genl_family_rcv_msg_dumpit+0x2ac/0x310 net/netlink/genetlink.c:638
genl_family_rcv_msg net/netlink/genetlink.c:733 [inline]
genl_rcv_msg+0x797/0x9e0 net/netlink/genetlink.c:753
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2466
genl_rcv+0x24/0x40 net/netlink/genetlink.c:764
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
sock_sendmsg+0xcf/0x120 net/socket.c:672
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca59
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Code: Bad RIP value.
RSP: 002b:00007f315bdc2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000005017e0 RCX: 000000000045ca59
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a15 R14: 00000000004d69a8 R15: 00007f315bdc36d4
Allocated by task 8381:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
set_track mm/kasan/common.c:56 [inline]
__kmalloc_reserve net/core/skbuff.c:142 [inline]
__alloc_skb+0xae/0x550 net/core/skbuff.c:210
alloc_skb include/linux/skbuff.h:1083 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
netlink_sendmsg+0x94f/0xd90 net/netlink/af_netlink.c:1893
netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
sock_sendmsg+0xcf/0x120 net/socket.c:672
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 8381:
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
kasan_set_free_info mm/kasan/common.c:316 [inline]
__kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
set_track mm/kasan/common.c:56 [inline]
kasan_set_free_info mm/kasan/common.c:316 [inline]
__cache_free mm/slab.c:3426 [inline]
kfree+0x103/0x2c0 mm/slab.c:3757
skb_free_head net/core/skbuff.c:590 [inline]
skb_release_data+0x6d9/0x910 net/core/skbuff.c:610
skb_release_all net/core/skbuff.c:664 [inline]
__kfree_skb net/core/skbuff.c:678 [inline]
consume_skb net/core/skbuff.c:837 [inline]
consume_skb+0xc2/0x160 net/core/skbuff.c:831
consume_skb net/core/skbuff.c:837 [inline]
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x53b/0x7d0 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
sock_sendmsg+0xcf/0x120 net/socket.c:672
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff88808337a800
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 20 bytes inside of
512-byte region [ffff88808337a800, ffff88808337aa00)
The buggy address is located 20 bytes inside of
The buggy address belongs to the page:
page:ffffea00020cde80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00020cd388 ffffea00024a8108 ffff8880aa000a80
raw: 0000000000000000 ffff88808337a000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88808337a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
Memory state around the buggy address:
ffff88808337a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88808337a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88808337a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808337a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 472fd78c netlink: avoid interrupting critical section
git tree: https://github.com/congwang/linux.git net
console output: https://syzkaller.appspot.com/x/log.txt?x=11249519100000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcc6334acae363d4
dashboard link: https://syzkaller.appspot.com/bug?extid=3039ddf6d7b13daf3787
compiler: gcc (GCC) 10.1.0-syz 20200507
syzbot
Jun 27, 2020, 12:22:08 AM6/27/20
to syzkall...@googlegroups.com, xiyou.w...@gmail.com
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger crash:
Reported-and-tested-by: syzbot+3039dd...@syzkaller.appspotmail.com
Tested on:
commit: 152c6a4d genetlink: get rid of family->attrbuf
syzbot has tested the proposed patch and the reproducer did not trigger crash:
Reported-and-tested-by: syzbot+3039dd...@syzkaller.appspotmail.com
Tested on:
commit: 152c6a4d genetlink: get rid of family->attrbuf
git tree: https://github.com/congwang/linux.git net
kernel config: https://syzkaller.appspot.com/x/.config?x=bf3aec367b9ab569
dashboard link: https://syzkaller.appspot.com/bug?extid=3039ddf6d7b13daf3787
compiler: gcc (GCC) 10.1.0-syz 20200507
Note: testing is done by a robot and is best-effort only.
compiler: gcc (GCC) 10.1.0-syz 20200507
Reply all
Reply to author
Forward
0 new messages