Subject: [syzbot] [net?] general protection fault in ptp_ioctl

From: syzbot <[email-masked]>
Date: Sun, 05 Nov 2023 11:10:33 -0800

Hello,

syzbot found the following issue on:

HEAD commit:    4652b8e4f3ff Merge tag '6.7-rc-ksmbd-server-fixes' of git:..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11aa125f680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=423e70610024fd6b
dashboard link: https://syzkaller.appspot.com/bug?extid=8a78ecea7ac1a2ea26e5
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16193ef7680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17e035d7680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a9cb6d5a8c4b/disk-4652b8e4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/363795681962/vmlinux-4652b8e4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/113d96b73fef/bzImage-4652b8e4.xz

The issue was bisected to:

commit c5a445b1e9347b14752b01f1a304bd7a2f260acc
Author: Xabier Marquiegui <[email-masked]>
Date:   Wed Oct 11 22:39:56 2023 +0000

    ptp: support event queue reader channel masks

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=122491ef680000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=112491ef680000
console output: https://syzkaller.appspot.com/x/log.txt?x=162491ef680000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]
Fixes: c5a445b1e934 ("ptp: support event queue reader channel masks")

general protection fault, probably for non-canonical address 0xdffffc000000020b: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000000001058-0x000000000000105f]
CPU: 0 PID: 5053 Comm: syz-executor353 Not tainted 6.6.0-syzkaller-10396-g4652b8e4f3ff #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:ptp_ioctl+0xcb7/0x1d10 drivers/ptp/ptp_chardev.c:476
Code: 81 fe 13 3d 00 00 0f 85 9c 02 00 00 e8 c2 83 23 fa 49 8d bc 24 58 10 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 dc 0e 00 00 49 8b bc 24 58 10 00 00 ba 00 01 00
RSP: 0018:ffffc90003a37ba0 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffff88814a78a000 RCX: ffffffff8764f81f
RDX: 000000000000020b RSI: ffffffff8765028e RDI: 0000000000001058
RBP: ffffc90003a37ec0 R08: 0000000000000005 R09: ffffc90003a37c40
R10: 0000000000003d13 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90003a37c80 R14: 0000000000003d13 R15: ffffffff92ac78e8
FS:  00005555569a9380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000076e09000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 posix_clock_ioctl+0xf8/0x160 kernel/time/posix-clock.c:86
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f710ac4a2a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffda288c4c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffda288c698 RCX: 00007f710ac4a2a9
RDX: 0000000000000000 RSI: 0000000000003d13 RDI: 0000000000000003
RBP: 00007f710acbd610 R08: 00007ffda288c698 R09: 00007ffda288c698
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffda288c688 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ptp_ioctl+0xcb7/0x1d10 drivers/ptp/ptp_chardev.c:476
Code: 81 fe 13 3d 00 00 0f 85 9c 02 00 00 e8 c2 83 23 fa 49 8d bc 24 58 10 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 dc 0e 00 00 49 8b bc 24 58 10 00 00 ba 00 01 00
RSP: 0018:ffffc90003a37ba0 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffff88814a78a000 RCX: ffffffff8764f81f
RDX: 000000000000020b RSI: ffffffff8765028e RDI: 0000000000001058
RBP: ffffc90003a37ec0 R08: 0000000000000005 R09: ffffc90003a37c40
R10: 0000000000003d13 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90003a37c80 R14: 0000000000003d13 R15: ffffffff92ac78e8
FS:  00005555569a9380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005fdeb8 CR3: 0000000076e09000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	81 fe 13 3d 00 00    	cmp    $0x3d13,%esi
   6:	0f 85 9c 02 00 00    	jne    0x2a8
   c:	e8 c2 83 23 fa       	call   0xfa2383d3
  11:	49 8d bc 24 58 10 00 	lea    0x1058(%r12),%rdi
  18:	00
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 dc 0e 00 00    	jne    0xf10
  34:	49 8b bc 24 58 10 00 	mov    0x1058(%r12),%rdi
  3b:	00
  3c:	ba                   	.byte 0xba
  3d:	00 01                	add    %al,(%rcx)

---
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