general protection fault in scsi_queue

general protection fault in scsi_queue_rq
Status: upstream: reported C repro on 2020/10/12 14:51
Reported-by: syzbot+0796b72dc61f223d8cc5@syzkaller.appspotmail.com
First crash: 385d, last: 7h45m

Cause bisection: introduced by (bisect log) :
commit 2ceda20f0a99a74a82b78870f3b3e5fa93087a7f
Author: Christoph Hellwig <hch@lst.de>
Date: Mon Oct 5 08:41:23 2020 +0000

scsi: core: Move command size detection out of the fast path

Crash: BUG: unable to handle kernel NULL pointer dereference in scsi_queue_rq (log)
Repro: C syz .config

Patch testing requests:
Created	Duration	User	Repo	Result
2020/10/13 23:19	16m	jejb@linux.ibm.com	git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git scsi-misc	OK
2020/10/13 23:10	17m	jejb@linux.ibm.com	git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git scsi-misc	OK
2020/10/12 23:27	17m	anmol.karan123@gmail.com	upstream	OK

Sample crash report:

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 6508 Comm: syz-executor963 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:scsi_command_size include/scsi/scsi_common.h:24 [inline]
RIP: 0010:scsi_setup_scsi_cmnd drivers/scsi/scsi_lib.c:1178 [inline]
RIP: 0010:scsi_prepare_cmd drivers/scsi/scsi_lib.c:1564 [inline]
RIP: 0010:scsi_queue_rq+0x268a/0x3470 drivers/scsi/scsi_lib.c:1670
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 4d 0d 00 00 4c 8b b3 58 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 04 02 4c 89 f2 83 e2 07 38 d0 7f 08 84 c0 0f 85 25 0c 00 00
RSP: 0018:ffffc9000528f530 EFLAGS: 00010256
RAX: dffffc0000000000 RBX: ffff88801e03d400 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8486b687 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff8486b672 R11: 0000000000000000 R12: ffff88801e03d658
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801ac9c000
FS:  00007ff410e6c700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e00d39740 CR3: 000000004213b000 CR4: 0000000000350ee0
Call Trace:
 blk_mq_dispatch_rq_list+0x422/0x1f00 block/blk-mq.c:1360
 __blk_mq_sched_dispatch_requests+0x20b/0x410 block/blk-mq-sched.c:327
 blk_mq_sched_dispatch_requests+0xfb/0x180 block/blk-mq-sched.c:360
 __blk_mq_run_hw_queue+0xd8/0x150 block/blk-mq.c:1480
 __blk_mq_delay_run_hw_queue+0x547/0x640 block/blk-mq.c:1557
 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1610
 blk_mq_sched_insert_request+0x368/0x450 block/blk-mq-sched.c:479
 blk_execute_rq+0xdc/0x410 block/blk-exec.c:96
 sg_io+0x678/0x10e0 drivers/scsi/scsi_ioctl.c:484
 scsi_ioctl_sg_io drivers/scsi/scsi_ioctl.c:872 [inline]
 scsi_ioctl+0xa77/0x15d0 drivers/scsi/scsi_ioctl.c:928
 sd_ioctl+0x1a6/0x2b0 drivers/scsi/sd.c:1576
 blkdev_ioctl+0x2a1/0x700 block/ioctl.c:589
 block_ioctl+0xfa/0x140 block/fops.c:478
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7ff410eba599
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff410e6c2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff410f444c0 RCX: 00007ff410eba599
RDX: 0000000020002300 RSI: 0000000000002285 RDI: 0000000000000004
RBP: 00007ff410f12034 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ff410f12054 R14: 2f30656c69662f2e R15: 00007ff410f444c8
Modules linked in:
---[ end trace 6a5b9ccf7d777fc6 ]---
RIP: 0010:scsi_command_size include/scsi/scsi_common.h:24 [inline]
RIP: 0010:scsi_setup_scsi_cmnd drivers/scsi/scsi_lib.c:1178 [inline]
RIP: 0010:scsi_prepare_cmd drivers/scsi/scsi_lib.c:1564 [inline]
RIP: 0010:scsi_queue_rq+0x268a/0x3470 drivers/scsi/scsi_lib.c:1670
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 4d 0d 00 00 4c 8b b3 58 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 04 02 4c 89 f2 83 e2 07 38 d0 7f 08 84 c0 0f 85 25 0c 00 00
RSP: 0018:ffffc9000528f530 EFLAGS: 00010256
RAX: dffffc0000000000 RBX: ffff88801e03d400 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8486b687 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff8486b672 R11: 0000000000000000 R12: ffff88801e03d658
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801ac9c000
FS:  00007ff410e6c700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e00d39740 CR3: 000000004213b000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 4d 0d 00 00    	jne    0xd5b
   e:	4c 8b b3 58 02 00 00 	mov    0x258(%rbx),%r14
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	4c 89 f2             	mov    %r14,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
* 26:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2a:	4c 89 f2             	mov    %r14,%rdx
  2d:	83 e2 07             	and    $0x7,%edx
  30:	38 d0                	cmp    %dl,%al
  32:	7f 08                	jg     0x3c
  34:	84 c0                	test   %al,%al
  36:	0f 85 25 0c 00 00    	jne    0xc61

Crashes (3989):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-root	2021/10/15 17:56	upstream	ec681c53f8d2	0c5d9412	.config	log	report	syz	C		general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/02/12 02:59	upstream	291009f656e8	a5f86b15	.config	log	report	syz	C		general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/02/01 01:33	upstream	6642d600b541	fc9fd31e	.config	log	report	syz	C		general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/03/29 02:59	linux-next	931294922e65	a8529b82	.config	log	report	syz	C		general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2020/10/08 21:42	linux-next	e4fb79c771fb	92390980	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2021/10/26 23:10	upstream	3906fe9bb7f1	d50eb50a	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/24 23:39	upstream	6c62666d8879	282f03fb	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/24 00:44	upstream	9c0c4d24ac00	282f03fb	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/22 12:21	upstream	2f111a6fd5b5	55f90bc6	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/21 06:31	upstream	8e37395c3a5d	f111d03b	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/21 06:07	upstream	8e37395c3a5d	f111d03b	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/21 04:28	upstream	8e37395c3a5d	f111d03b	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-smack-root	2021/10/20 13:58	upstream	d9abdee5fd5a	418a00eb	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/20 12:49	upstream	d9abdee5fd5a	418a00eb	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/20 07:33	upstream	d9abdee5fd5a	466b7db1	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/20 03:27	upstream	d9abdee5fd5a	466b7db1	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/19 06:30	upstream	519d81956ee2	24dc29db	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/17 23:10	upstream	d999ade1cc86	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/17 22:00	upstream	d999ade1cc86	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/17 16:29	upstream	d999ade1cc86	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-qemu-upstream	2021/10/17 06:21	upstream	304040fb4909	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/16 18:28	upstream	8fe31e0995f0	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/16 07:11	upstream	8fe31e0995f0	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/15 23:01	upstream	ec681c53f8d2	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-smack-root	2021/10/14 17:55	upstream	26d657410983	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/14 07:41	upstream	348949d9a444	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/14 03:13	upstream	348949d9a444	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/14 01:22	upstream	348949d9a444	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-smack-root	2021/10/14 00:21	upstream	348949d9a444	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-smack-root	2021/10/14 00:21	upstream	348949d9a444	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/13 23:17	upstream	348949d9a444	5462d470	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/12 07:58	upstream	fa5878760579	838e7e2c	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/07 13:09	upstream	5af4055fa813	62ee0987	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/07 01:26	upstream	60a9483534ed	62ee0987	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/06 15:35	upstream	60a9483534ed	0a63fd36	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/05 00:04	upstream	84b3e42564ac	ce697b49	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/04 10:09	upstream	9e1ff307c779	ce697b49	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/03 02:40	upstream	ab2a7a35c4e7	db0f5787	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/10/03 01:14	upstream	ab2a7a35c4e7	db0f5787	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-root	2021/10/02 21:20	upstream	ab2a7a35c4e7	db0f5787	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-smack-root	2021/10/02 18:30	upstream	53d5fc89d66a	db0f5787	.config	log	report			info	general protection fault in scsi_queue_rq
ci-qemu-upstream-386	2021/10/19 22:49	upstream	d9abdee5fd5a	466b7db1	.config	log	report			info	general protection fault in scsi_queue_rq
ci-qemu-upstream-386	2021/10/19 17:17	upstream	d9abdee5fd5a	466b7db1	.config	log	report			info	general protection fault in scsi_queue_rq
ci-qemu-upstream-386	2021/10/19 06:35	upstream	519d81956ee2	24dc29db	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/28 07:54	linux-next	ae5179317e79	be531bb4	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/23 11:49	linux-next	cf6c9d12750c	282f03fb	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/17 19:10	linux-next	7c832d2f9b95	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/17 17:42	linux-next	7c832d2f9b95	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/16 06:02	linux-next	7c832d2f9b95	0c5d9412	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/15 00:13	linux-next	8006b911c90a	7aa5fe41	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/12 06:47	linux-next	d3134eb5de85	838e7e2c	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/11 02:42	linux-next	683f29b781ae	838e7e2c	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/10 05:39	linux-next	683f29b781ae	838e7e2c	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/10 05:39	linux-next	683f29b781ae	838e7e2c	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/08 03:56	linux-next	f8dc23b3dc0c	efe0f24d	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/07 01:13	linux-next	0dda5ee37364	62ee0987	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/04 01:43	linux-next	a25006a77348	db0f5787	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-linux-next-kasan-gce-root	2021/10/02 18:49	linux-next	a25006a77348	db0f5787	.config	log	report			info	general protection fault in scsi_queue_rq
ci-upstream-kasan-gce-selinux-root	2021/01/17 10:23	upstream	0da0a8a0a0e1	65a7a854	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/10/08 14:44	linux-next	e4fb79c771fb	92390980	.config	log	report			info