syzbot


BUG: unable to handle kernel NULL pointer dereference in sha1_mb_mgr_get_comp_job_avx2

Status: fixed on 2018/11/12 21:25
Subsystems: crypto
[Documentation on labels]
Reported-by: syzbot+87dbe4b17debcec16d71@syzkaller.appspotmail.com
Fix commit: ab8085c130ed crypto: x86 - remove SHA multibuffer routines and mcryptd
First crash: 2065d, last: 2065d
Discussions (1)
Title Replies (including bot) Last reply
BUG: unable to handle kernel NULL pointer dereference in sha1_mb_mgr_get_comp_job_avx2 2 (3) 2018/10/06 13:06

Sample crash report:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000034
PGD 1b8b87067 P4D 1b8b87067 PUD 1b8b88067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 4.19.0-rc5+ #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: crypto mcryptd_flusher
RIP: 0010:sha1_mb_mgr_get_comp_job_avx2+0x62/0xba arch/x86/crypto/sha1-mb/sha1_mb_mgr_flush_avx2.S:256
Code: 04 c4 e2 69 3b d3 c4 c1 79 7e d0 49 f7 c0 f0 ff ff ff 75 6e 49 6b d8 08 48 8d 9c 1f 08 01 00 00 48 8b 03 48 c7 03 00 00 00 00 <c7> 40 34 02 00 00 00 48 8b 9f 00 01 00 00 48 c1 e3 04 4c 09 c3 48
kobject: 'loop1' (00000000307f8c2f): kobject_uevent_env
RSP: 0018:ffff8801d94473c0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff8801d4818688 RCX: 1ffff1003b2869e1
RDX: 1ffffd1ffffa2591 RSI: ffffffff81454f3a RDI: ffff8801d4818580
RBP: ffff8801d9447520 R08: 0000000000000000 R09: 0000000000000006
kobject: 'loop1' (00000000307f8c2f): fill_kobj_path: path = '/devices/virtual/block/loop1'
R10: 0000000000000000 R11: ffff8801d9434640 R12: ffff8801d94474f8
R13: 0000000000000001 R14: ffff8801bb509720 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop4' (00000000fa342cfc): kobject_uevent_env
CR2: 0000000000000034 CR3: 00000001b8b85000 CR4: 00000000001406e0
kobject: 'loop4' (00000000fa342cfc): fill_kobj_path: path = '/devices/virtual/block/loop4'
Call Trace:
 sha1_mb_flusher+0x2f4/0x60b arch/x86/crypto/sha1-mb/sha1_mb.c:918
 mcryptd_flusher+0x3af/0x520 crypto/mcryptd.c:208
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Modules linked in:
CR2: 0000000000000034
---[ end trace 7d3a48e5625a9543 ]---
RIP: 0010:sha1_mb_mgr_get_comp_job_avx2+0x62/0xba arch/x86/crypto/sha1-mb/sha1_mb_mgr_flush_avx2.S:256
Code: 04 c4 e2 69 3b d3 c4 c1 79 7e d0 49 f7 c0 f0 ff ff ff 75 6e 49 6b d8 08 48 8d 9c 1f 08 01 00 00 48 8b 03 48 c7 03 00 00 00 00 <c7> 40 34 02 00 00 00 48 8b 9f 00 01 00 00 48 c1 e3 04 4c 09 c3 48
RSP: 0018:ffff8801d94473c0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff8801d4818688 RCX: 1ffff1003b2869e1
RDX: 1ffffd1ffffa2591 RSI: ffffffff81454f3a RDI: ffff8801d4818580
RBP: ffff8801d9447520 R08: 0000000000000000 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801d9434640 R12: ffff8801d94474f8
R13: 0000000000000001 R14: ffff8801bb509720 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000034 CR3: 00000001b8b85000 CR4: 00000000001406e0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/09/26 12:35 upstream a38523185b40 455b6354 .config console log report ci-upstream-kasan-gce-smack-root
* Struck through repros no longer work on HEAD.