syzbot


BUG: unable to handle kernel paging request in csi_J
Status: fixed on 2020/08/02 06:53
Reported-by: syzbot+9a156bceccb9ed2db3d7@syzkaller.appspotmail.com
Fix commit: 74752b81eae8 vt: Reject zero-sized screen buffer size.
First crash: 862d, last: 694d

Fix bisection: fixed by (bisect log) :
commit 74752b81eae8ae64e97de222320026367e92c4b5
Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Sun Jul 12 11:10:12 2020 +0000

  vt: Reject zero-sized screen buffer size.

similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in csi_J C done error 11 743d 869d 0/22 closed as dup on 2020/08/16 01:38
linux-4.14 BUG: unable to handle kernel paging request in csi_J C inconclusive 3 712d 868d 0/1 upstream: reported C repro on 2020/01/09 15:19

Sample crash report:
audit: type=1400 audit(1579132610.070:36): avc:  denied  { map } for  pid=8136 comm="syz-executor120" path="/root/syz-executor120062350" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
BUG: unable to handle kernel paging request at 000000010000000e
PGD a07f8067 P4D a07f8067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8136 Comm: syz-executor120 Not tainted 4.19.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memset16 arch/x86/include/asm/string_64.h:43 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:csi_J+0x2bf/0xb40 drivers/tty/vt/vt.c:1530
Code: ff df 43 8d 4c 2d 00 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 09 07 00 00 0f b7 83 c8 03 00 00 d1 e9 4c 89 e7 <f3> 66 ab 48 8d bb f8 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffff88809746f730 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffff88808c086600 RCX: 0000000000000001
RDX: 1ffff11011810d39 RSI: ffffffff83b54556 RDI: 000000010000000e
RBP: ffff88809746f770 R08: ffff88808afcc5c0 R09: 0000000000000005
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 000000010000000e
R13: 7fffffff80000001 R14: 0000000000000000 R15: 0000000000000000
FS:  000000000185e880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 0000000091eae000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_trol+0x3ae1/0x6070 drivers/tty/vt/vt.c:2348
 do_con_write.part.0+0xfd5/0x1eb0 drivers/tty/vt/vt.c:2773
 do_con_write drivers/tty/vt/vt.c:2541 [inline]
 con_write+0x46/0xd0 drivers/tty/vt/vt.c:3110
 process_output_block drivers/tty/n_tty.c:593 [inline]
 n_tty_write+0x3f9/0x1140 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:960 [inline]
 tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044
 __vfs_write+0x114/0x810 fs/read_write.c:485
 vfs_write+0x20c/0x560 fs/read_write.c:549
 ksys_write+0x14f/0x2d0 fs/read_write.c:599
 __do_sys_write fs/read_write.c:611 [inline]
 __se_sys_write fs/read_write.c:608 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:608
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4404f9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffbfe86d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9
RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0
R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: 000000010000000e
---[ end trace 39792be6e711734b ]---
RIP: 0010:memset16 arch/x86/include/asm/string_64.h:43 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:csi_J+0x2bf/0xb40 drivers/tty/vt/vt.c:1530
Code: ff df 43 8d 4c 2d 00 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 09 07 00 00 0f b7 83 c8 03 00 00 d1 e9 4c 89 e7 <f3> 66 ab 48 8d bb f8 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffff88809746f730 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffff88808c086600 RCX: 0000000000000001
RDX: 1ffff11011810d39 RSI: ffffffff83b54556 RDI: 000000010000000e
RBP: ffff88809746f770 R08: ffff88808afcc5c0 R09: 0000000000000005
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 000000010000000e
R13: 7fffffff80000001 R14: 0000000000000000 R15: 0000000000000000
FS:  000000000185e880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 0000000091eae000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-19 2020/01/16 00:00 linux-4.19.y db5b9190ff82 f9b69507 .config log report syz C
ci2-linux-4-19 2020/05/03 02:52 linux-4.19.y fdc072324f3c 5457883a .config log report
ci2-linux-4-19 2020/01/15 21:21 linux-4.19.y db5b9190ff82 f9b69507 .config log report