KASAN: use-after-free Read in crypto_destroy_tfm

From: syzbot
Date: Sat May 26 2018 - 13:40:09 EST

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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@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
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
==================================================================

---
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Next message: Peter Rosin: "Re: [PATCH] mtd: nand: raw: atmel: add module param to avoid using dma"
Previous message: Salvatore Mesoraca: "Re: [PATCH] proc: prevent a task from writing on its own /proc/*/mem"
Next in thread: Dmitry Vyukov: "Re: KASAN: use-after-free Read in crypto_destroy_tfm"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]