* KASAN: use-after-free Read in crypto_destroy_tfm
@ 2018-05-26 17:40 syzbot
2018-05-26 17:41 ` Dmitry Vyukov
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2018-05-26 17:40 UTC (permalink / raw)
To: davem, herbert, linux-crypto, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following crash on:
HEAD commit: 0644f186fc9d Merge tag 'for_linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=102bc257800000
kernel config: https://syzkaller.appspot.com/x/.config?x=61c12b53c2a25ec4
dashboard link: https://syzkaller.appspot.com/bug?extid=352126a5be7ccb25754e
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+352126a5be7ccb25754e@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in crypto_destroy_tfm+0x2a3/0x300
crypto/api.c:573
Read of size 8 at addr ffff8801d9023238 by task syz-executor6/10078
CPU: 1 PID: 10078 Comm: syz-executor6 Not tainted 4.17.0-rc2+ #19
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+0x1b9/0x294 lib/dump_stack.c:113
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
crypto_destroy_tfm+0x2a3/0x300 crypto/api.c:573
crypto_free_rng include/crypto/rng.h:122 [inline]
rng_release+0x18/0x20 crypto/algif_rng.c:124
alg_do_release crypto/af_alg.c:119 [inline]
alg_sock_destruct+0x92/0xe0 crypto/af_alg.c:362
__sk_destruct+0xff/0xa40 net/core/sock.c:1566
sk_destruct+0x78/0x90 net/core/sock.c:1601
__sk_free+0x22e/0x340 net/core/sock.c:1612
sk_free+0x42/0x50 net/core/sock.c:1623
sock_put include/net/sock.h:1664 [inline]
af_alg_release+0x6e/0x90 crypto/af_alg.c:126
sock_release+0x96/0x1b0 net/socket.c:594
sock_close+0x16/0x20 net/socket.c:1149
__fput+0x34d/0x890 fs/file_table.c:209
____fput+0x15/0x20 fs/file_table.c:243
task_work_run+0x1e4/0x290 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x1aee/0x2730 kernel/exit.c:865
do_group_exit+0x16f/0x430 kernel/exit.c:968
get_signal+0x886/0x1960 kernel/signal.c:2469
do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455979
RSP: 002b:00007f4f4bbc2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: 0000000000000000 RBX: 00007f4f4bbc36d4 RCX: 0000000000455979
RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000014
RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000204f7000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000519 R14: 00000000006faaf8 R15: 0000000000000001
Allocated by task 4484:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
__do_kmalloc_node mm/slab.c:3682 [inline]
__kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
__kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137
__alloc_skb+0x14d/0x780 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:987 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
netlink_sendmsg+0xb01/0xfa0 net/netlink/af_netlink.c:1876
sock_sendmsg_nosec net/socket.c:629 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:639
___sys_sendmsg+0x805/0x940 net/socket.c:2117
__sys_sendmsg+0x115/0x270 net/socket.c:2155
__do_sys_sendmsg net/socket.c:2164 [inline]
__se_sys_sendmsg net/socket.c:2162 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 4484:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xd9/0x260 mm/slab.c:3813
skb_free_head+0x99/0xc0 net/core/skbuff.c:550
skb_release_data+0x690/0x860 net/core/skbuff.c:570
skb_release_all+0x4a/0x60 net/core/skbuff.c:627
__kfree_skb net/core/skbuff.c:641 [inline]
consume_skb+0x18b/0x550 net/core/skbuff.c:701
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x593/0x740 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
sock_sendmsg_nosec net/socket.c:629 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:639
___sys_sendmsg+0x805/0x940 net/socket.c:2117
__sys_sendmsg+0x115/0x270 net/socket.c:2155
__do_sys_sendmsg net/socket.c:2164 [inline]
__se_sys_sendmsg net/socket.c:2162 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8801d9023200
which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 56 bytes inside of
1024-byte region [ffff8801d9023200, ffff8801d9023600)
The buggy address belongs to the page:
page:ffffea0007640880 count:1 mapcount:0 mapping:ffff8801d9022000 index:0x0
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801d9022000 0000000000000000 0000000100000007
raw: ffffea0006ea5e20 ffffea00073785a0 ffff8801da800ac0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d9023100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801d9023180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801d9023200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8801d9023280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801d9023300: 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 syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KASAN: use-after-free Read in crypto_destroy_tfm
2018-05-26 17:40 KASAN: use-after-free Read in crypto_destroy_tfm syzbot
@ 2018-05-26 17:41 ` Dmitry Vyukov
2018-05-29 18:21 ` Eric Biggers
0 siblings, 1 reply; 3+ messages in thread
From: Dmitry Vyukov @ 2018-05-26 17:41 UTC (permalink / raw)
To: syzbot, Eric Biggers
Cc: David Miller, Herbert Xu,
open list:HARDWARE RANDOM NUMBER GENERATOR CORE, LKML,
syzkaller-bugs
On Sat, May 26, 2018 at 7:40 PM, syzbot
<syzbot+352126a5be7ccb25754e@syzkaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 0644f186fc9d Merge tag 'for_linus' of git://git.kernel.org..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=102bc257800000
> kernel config: https://syzkaller.appspot.com/x/.config?x=61c12b53c2a25ec4
> dashboard link: https://syzkaller.appspot.com/bug?extid=352126a5be7ccb25754e
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+352126a5be7ccb25754e@syzkaller.appspotmail.com
Eric, do you remember if we had any recent fixes for this?
> ==================================================================
> BUG: KASAN: use-after-free in crypto_destroy_tfm+0x2a3/0x300
> crypto/api.c:573
> Read of size 8 at addr ffff8801d9023238 by task syz-executor6/10078
>
> CPU: 1 PID: 10078 Comm: syz-executor6 Not tainted 4.17.0-rc2+ #19
> 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+0x1b9/0x294 lib/dump_stack.c:113
> print_address_description+0x6c/0x20b mm/kasan/report.c:256
> kasan_report_error mm/kasan/report.c:354 [inline]
> kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
> __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
> crypto_destroy_tfm+0x2a3/0x300 crypto/api.c:573
> crypto_free_rng include/crypto/rng.h:122 [inline]
> rng_release+0x18/0x20 crypto/algif_rng.c:124
> alg_do_release crypto/af_alg.c:119 [inline]
> alg_sock_destruct+0x92/0xe0 crypto/af_alg.c:362
> __sk_destruct+0xff/0xa40 net/core/sock.c:1566
> sk_destruct+0x78/0x90 net/core/sock.c:1601
> __sk_free+0x22e/0x340 net/core/sock.c:1612
> sk_free+0x42/0x50 net/core/sock.c:1623
> sock_put include/net/sock.h:1664 [inline]
> af_alg_release+0x6e/0x90 crypto/af_alg.c:126
> sock_release+0x96/0x1b0 net/socket.c:594
> sock_close+0x16/0x20 net/socket.c:1149
> __fput+0x34d/0x890 fs/file_table.c:209
> ____fput+0x15/0x20 fs/file_table.c:243
> task_work_run+0x1e4/0x290 kernel/task_work.c:113
> exit_task_work include/linux/task_work.h:22 [inline]
> do_exit+0x1aee/0x2730 kernel/exit.c:865
> do_group_exit+0x16f/0x430 kernel/exit.c:968
> get_signal+0x886/0x1960 kernel/signal.c:2469
> do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
> exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
> prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
> syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
> do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x455979
> RSP: 002b:00007f4f4bbc2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
> RAX: 0000000000000000 RBX: 00007f4f4bbc36d4 RCX: 0000000000455979
> RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000014
> RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000
> R10: 00000000204f7000 R11: 0000000000000246 R12: 00000000ffffffff
> R13: 0000000000000519 R14: 00000000006faaf8 R15: 0000000000000001
>
> Allocated by task 4484:
> save_stack+0x43/0xd0 mm/kasan/kasan.c:448
> set_track mm/kasan/kasan.c:460 [inline]
> kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
> __do_kmalloc_node mm/slab.c:3682 [inline]
> __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
> __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137
> __alloc_skb+0x14d/0x780 net/core/skbuff.c:205
> alloc_skb include/linux/skbuff.h:987 [inline]
> netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
> netlink_sendmsg+0xb01/0xfa0 net/netlink/af_netlink.c:1876
> sock_sendmsg_nosec net/socket.c:629 [inline]
> sock_sendmsg+0xd5/0x120 net/socket.c:639
> ___sys_sendmsg+0x805/0x940 net/socket.c:2117
> __sys_sendmsg+0x115/0x270 net/socket.c:2155
> __do_sys_sendmsg net/socket.c:2164 [inline]
> __se_sys_sendmsg net/socket.c:2162 [inline]
> __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
> do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> Freed by task 4484:
> save_stack+0x43/0xd0 mm/kasan/kasan.c:448
> set_track mm/kasan/kasan.c:460 [inline]
> __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
> kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
> __cache_free mm/slab.c:3498 [inline]
> kfree+0xd9/0x260 mm/slab.c:3813
> skb_free_head+0x99/0xc0 net/core/skbuff.c:550
> skb_release_data+0x690/0x860 net/core/skbuff.c:570
> skb_release_all+0x4a/0x60 net/core/skbuff.c:627
> __kfree_skb net/core/skbuff.c:641 [inline]
> consume_skb+0x18b/0x550 net/core/skbuff.c:701
> netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
> netlink_unicast+0x593/0x740 net/netlink/af_netlink.c:1336
> netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
> sock_sendmsg_nosec net/socket.c:629 [inline]
> sock_sendmsg+0xd5/0x120 net/socket.c:639
> ___sys_sendmsg+0x805/0x940 net/socket.c:2117
> __sys_sendmsg+0x115/0x270 net/socket.c:2155
> __do_sys_sendmsg net/socket.c:2164 [inline]
> __se_sys_sendmsg net/socket.c:2162 [inline]
> __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
> do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> The buggy address belongs to the object at ffff8801d9023200
> which belongs to the cache kmalloc-1024 of size 1024
> The buggy address is located 56 bytes inside of
> 1024-byte region [ffff8801d9023200, ffff8801d9023600)
> The buggy address belongs to the page:
> page:ffffea0007640880 count:1 mapcount:0 mapping:ffff8801d9022000 index:0x0
> compound_mapcount: 0
> flags: 0x2fffc0000008100(slab|head)
> raw: 02fffc0000008100 ffff8801d9022000 0000000000000000 0000000100000007
> raw: ffffea0006ea5e20 ffffea00073785a0 ffff8801da800ac0 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8801d9023100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8801d9023180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>>
>> ffff8801d9023200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>
> ^
> ffff8801d9023280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8801d9023300: 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 syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
>
> --
> You received this message because you are subscribed to the Google Groups
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> To unsubscribe from this group and stop receiving emails from it, send an
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KASAN: use-after-free Read in crypto_destroy_tfm
2018-05-26 17:41 ` Dmitry Vyukov
@ 2018-05-29 18:21 ` Eric Biggers
0 siblings, 0 replies; 3+ messages in thread
From: Eric Biggers @ 2018-05-29 18:21 UTC (permalink / raw)
To: Dmitry Vyukov
Cc: syzbot, Eric Biggers, David Miller, Herbert Xu,
open list:HARDWARE RANDOM NUMBER GENERATOR CORE, LKML,
syzkaller-bugs
On Sat, May 26, 2018 at 07:41:34PM +0200, 'Dmitry Vyukov' via syzkaller-bugs wrote:
> On Sat, May 26, 2018 at 7:40 PM, syzbot
> <syzbot+352126a5be7ccb25754e@syzkaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: 0644f186fc9d Merge tag 'for_linus' of git://git.kernel.org..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=102bc257800000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=61c12b53c2a25ec4
> > dashboard link: https://syzkaller.appspot.com/bug?extid=352126a5be7ccb25754e
> > compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+352126a5be7ccb25754e@syzkaller.appspotmail.com
>
> Eric, do you remember if we had any recent fixes for this?
I don't think so. Commit eea0d3ea754696 ("crypto: drbg - set freed buffers to
NULL") *might* be related, but this looks different.
>
> > ==================================================================
> > BUG: KASAN: use-after-free in crypto_destroy_tfm+0x2a3/0x300
> > crypto/api.c:573
> > Read of size 8 at addr ffff8801d9023238 by task syz-executor6/10078
> >
> > CPU: 1 PID: 10078 Comm: syz-executor6 Not tainted 4.17.0-rc2+ #19
> > 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+0x1b9/0x294 lib/dump_stack.c:113
> > print_address_description+0x6c/0x20b mm/kasan/report.c:256
> > kasan_report_error mm/kasan/report.c:354 [inline]
> > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
> > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
> > crypto_destroy_tfm+0x2a3/0x300 crypto/api.c:573
> > crypto_free_rng include/crypto/rng.h:122 [inline]
> > rng_release+0x18/0x20 crypto/algif_rng.c:124
> > alg_do_release crypto/af_alg.c:119 [inline]
> > alg_sock_destruct+0x92/0xe0 crypto/af_alg.c:362
> > __sk_destruct+0xff/0xa40 net/core/sock.c:1566
> > sk_destruct+0x78/0x90 net/core/sock.c:1601
> > __sk_free+0x22e/0x340 net/core/sock.c:1612
> > sk_free+0x42/0x50 net/core/sock.c:1623
> > sock_put include/net/sock.h:1664 [inline]
> > af_alg_release+0x6e/0x90 crypto/af_alg.c:126
> > sock_release+0x96/0x1b0 net/socket.c:594
> > sock_close+0x16/0x20 net/socket.c:1149
> > __fput+0x34d/0x890 fs/file_table.c:209
> > ____fput+0x15/0x20 fs/file_table.c:243
> > task_work_run+0x1e4/0x290 kernel/task_work.c:113
> > exit_task_work include/linux/task_work.h:22 [inline]
> > do_exit+0x1aee/0x2730 kernel/exit.c:865
> > do_group_exit+0x16f/0x430 kernel/exit.c:968
> > get_signal+0x886/0x1960 kernel/signal.c:2469
> > do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
> > exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
> > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
> > syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
> > do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
> > entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > RIP: 0033:0x455979
> > RSP: 002b:00007f4f4bbc2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
> > RAX: 0000000000000000 RBX: 00007f4f4bbc36d4 RCX: 0000000000455979
> > RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000014
> > RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000
> > R10: 00000000204f7000 R11: 0000000000000246 R12: 00000000ffffffff
> > R13: 0000000000000519 R14: 00000000006faaf8 R15: 0000000000000001
> >
> > Allocated by task 4484:
> > save_stack+0x43/0xd0 mm/kasan/kasan.c:448
> > set_track mm/kasan/kasan.c:460 [inline]
> > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
> > __do_kmalloc_node mm/slab.c:3682 [inline]
> > __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
> > __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137
> > __alloc_skb+0x14d/0x780 net/core/skbuff.c:205
> > alloc_skb include/linux/skbuff.h:987 [inline]
> > netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
> > netlink_sendmsg+0xb01/0xfa0 net/netlink/af_netlink.c:1876
> > sock_sendmsg_nosec net/socket.c:629 [inline]
> > sock_sendmsg+0xd5/0x120 net/socket.c:639
> > ___sys_sendmsg+0x805/0x940 net/socket.c:2117
> > __sys_sendmsg+0x115/0x270 net/socket.c:2155
> > __do_sys_sendmsg net/socket.c:2164 [inline]
> > __se_sys_sendmsg net/socket.c:2162 [inline]
> > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
> > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> > entry_SYSCALL_64_after_hwframe+0x49/0xbe
> >
> > Freed by task 4484:
> > save_stack+0x43/0xd0 mm/kasan/kasan.c:448
> > set_track mm/kasan/kasan.c:460 [inline]
> > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
> > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
> > __cache_free mm/slab.c:3498 [inline]
> > kfree+0xd9/0x260 mm/slab.c:3813
> > skb_free_head+0x99/0xc0 net/core/skbuff.c:550
> > skb_release_data+0x690/0x860 net/core/skbuff.c:570
> > skb_release_all+0x4a/0x60 net/core/skbuff.c:627
> > __kfree_skb net/core/skbuff.c:641 [inline]
> > consume_skb+0x18b/0x550 net/core/skbuff.c:701
> > netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
> > netlink_unicast+0x593/0x740 net/netlink/af_netlink.c:1336
> > netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
> > sock_sendmsg_nosec net/socket.c:629 [inline]
> > sock_sendmsg+0xd5/0x120 net/socket.c:639
> > ___sys_sendmsg+0x805/0x940 net/socket.c:2117
> > __sys_sendmsg+0x115/0x270 net/socket.c:2155
> > __do_sys_sendmsg net/socket.c:2164 [inline]
> > __se_sys_sendmsg net/socket.c:2162 [inline]
> > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
> > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> > entry_SYSCALL_64_after_hwframe+0x49/0xbe
> >
> > The buggy address belongs to the object at ffff8801d9023200
> > which belongs to the cache kmalloc-1024 of size 1024
> > The buggy address is located 56 bytes inside of
> > 1024-byte region [ffff8801d9023200, ffff8801d9023600)
> > The buggy address belongs to the page:
> > page:ffffea0007640880 count:1 mapcount:0 mapping:ffff8801d9022000 index:0x0
> > compound_mapcount: 0
> > flags: 0x2fffc0000008100(slab|head)
> > raw: 02fffc0000008100 ffff8801d9022000 0000000000000000 0000000100000007
> > raw: ffffea0006ea5e20 ffffea00073785a0 ffff8801da800ac0 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> > ffff8801d9023100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ffff8801d9023180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >>
> >> ffff8801d9023200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >
> > ^
> > ffff8801d9023280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ffff8801d9023300: 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 syzkaller@googlegroups.com.
> >
> > syzbot will keep track of this bug report. See:
> > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> > syzbot.
> >
> > --
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> > email to syzkaller-bugs+unsubscribe@googlegroups.com.
> > To view this discussion on the web visit
> > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000c791b2056d1f5f7e%40google.com.
> > For more options, visit https://groups.google.com/d/optout.
>
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end of thread, other threads:[~2018-05-29 18:21 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2018-05-26 17:40 KASAN: use-after-free Read in crypto_destroy_tfm syzbot
2018-05-26 17:41 ` Dmitry Vyukov
2018-05-29 18:21 ` Eric Biggers
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