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KASAN: use-after-free Write in tls_push_record (2)




Hello,

syzbot found the following crash on:

HEAD commit:    1e09177acae3 Merge tag 'mips_fixes_4.18_3' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=128903b2400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=25856fac4e580aa7
dashboard link: https://syzkaller.appspot.com/bug?extid=6c4e6ecbf9a2797be67c
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=12312678400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13ef76c2400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6c4e6ecbf9a2797be67c@xxxxxxxxxxxxxxxxxxxxxxxxx

RDX: 00000000fffffdef RSI: 00000000200005c0 RDI: 0000000000000003
RBP: 00000000006cb018 R08: 0000000020000000 R09: 000000000000001c
R10: 0000000000000040 R11: 0000000000000212 R12: 0000000000000005
R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:339 [inline] BUG: KASAN: use-after-free in tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239
Write of size 1 at addr ffff8801ae430000 by task syz-executor589/4567

CPU: 0 PID: 4567 Comm: syz-executor589 Not tainted 4.18.0-rc4+ #141
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+0x1c9/0x2b4 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_store1_noabort+0x17/0x20 mm/kasan/report.c:435
 tls_fill_prepend include/net/tls.h:339 [inline]
 tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:276
 tls_handle_open_record net/tls/tls_main.c:164 [inline]
 tls_sk_proto_close+0x74c/0xae0 net/tls/tls_main.c:264
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459
 __sock_release+0xd7/0x260 net/socket.c:599
 sock_close+0x19/0x20 net/socket.c:1150
 __fput+0x355/0x8b0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1b08/0x2750 kernel/exit.c:865
 do_group_exit+0x177/0x440 kernel/exit.c:968
 __do_sys_exit_group kernel/exit.c:979 [inline]
 __se_sys_exit_group kernel/exit.c:977 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43f358
Code: Bad RIP value.
RSP: 002b:00007fff51750198 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f358
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf448 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0006b90c00 count:0 mapcount:-128 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea0006b96408 ffff88021fffac18 0000000000000000
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ae42ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ae42ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801ae430000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8801ae430080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801ae430100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


---
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