syzbot


general protection fault in fbcon_set_font

Status: auto-closed as invalid on 2021/07/31 20:18
Reported-by: syzbot+9dc20ecc28765551d480@syzkaller.appspotmail.com
First crash: 485d, last: 453d

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 14473 Comm: syz-executor.0 Not tainted 4.14.228-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888044560200 task.stack: ffff88804c7d8000
RIP: 0010:fbcon_set_font+0x590/0x7c0 drivers/video/fbdev/core/fbcon.c:2482
RSP: 0018:ffff88804c7df9c0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000001c RCX: ffffc90005bd7000
RDX: 0000000000000076 RSI: ffffffff83371489 RDI: 00000000000003b0
RBP: dffffc0000000000 R08: 0000000000000000 R09: 000000000863840a
R10: ffffffff87cd42c0 R11: 0000000000000000 R12: ffffffff8c8b4f00
R13: 000000004481b25e R14: 000000000000001c R15: ffff88804a5b4990
FS:  00007efc7c1c6700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ca307b718 CR3: 00000000b53d9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 con_font_set drivers/tty/vt/vt.c:4190 [inline]
 con_font_op+0x9e8/0xdb0 drivers/tty/vt/vt.c:4234
 vt_ioctl+0x113d/0x1d50 drivers/tty/vt/vt_ioctl.c:990
 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007efc7c1c6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000004
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdf34b699f R14: 00007efc7c1c6300 R15: 0000000000022000
Code: 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 3a 02 00 00 4b 8d 04 f6 48 8b 04 c5 c0 ea 8b 8c 48 8d b8 b0 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 2a 84 d2 74 09 80 fa 03 0f 8e 48 01 00 00 8b 4c 24 2c 
RIP: fbcon_set_font+0x590/0x7c0 drivers/video/fbdev/core/fbcon.c:2482 RSP: ffff88804c7df9c0
---[ end trace e6e316810546e57c ]---

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2021/04/02 20:18 linux-4.14.y bd634aa64163 6a81331a .config log report info general protection fault in fbcon_set_font
ci2-linux-4-14 2021/03/01 02:28 linux-4.14.y 3242aa3a635c 4c37c133 .config log report info general protection fault in fbcon_set_font