audit: type=1400 audit(1591806322.932:8): avc:  denied  { execmem } for  pid=6431 comm="syz-executor457" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
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
CPU: 0 PID: 6432 Comm: syz-executor457 Not tainted 4.19.127-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:do_con_write.part.0+0x9c3/0x1db0 drivers/tty/vt/vt.c:2766
Code: 24 b6 00 00 00 45 01 ef e8 3a 2a c7 fd 48 8b 44 24 78 80 38 00 0f 85 4c 12 00 00 49 8b 9c 24 a0 03 00 00 48 89 d8 48 c1 e8 03 <0f> b6 14 28 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 c8
RSP: 0018:ffff8880a66977c0 EFLAGS: 00010203
RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83a06036
RDX: 0000000000000000 RSI: ffffffff83a06086 RDI: 0000000000000003
RBP: dffffc0000000000 R08: ffff8880a6366300 R09: 0000000000000004
R10: ffffed1015cc473a R11: ffff8880ae6239d3 R12: ffff8880a648f440
R13: 0000000000000000 R14: ffff8880a648f7cc R15: 000000000000075e
FS:  00007f9ada69d700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005615c1cbd9a8 CR3: 0000000091576000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_write drivers/tty/vt/vt.c:3149 [inline]
 con_put_char+0xf0/0x100 drivers/tty/vt/vt.c:3148
 tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:2887
 __process_echoes+0x56d/0xa00 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0xbc1/0x2a90 drivers/tty/n_tty.c:1740
 tiocsti drivers/tty/tty_io.c:2194 [inline]
 tty_ioctl+0xe0e/0x1420 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445ab9
Code: e8 fc b8 02 00 48 83 c4 18 c3 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f9ada69cdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445ab9
RDX: 00000000200000c0 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c
R13: 00007ffd106db2ff R14: 00007f9ada69d9c0 R15: 20c49ba5e353f7cf
Modules linked in:
---[ end trace 1574e1cc4569987d ]---
RIP: 0010:do_con_write.part.0+0x9c3/0x1db0 drivers/tty/vt/vt.c:2766
Code: 24 b6 00 00 00 45 01 ef e8 3a 2a c7 fd 48 8b 44 24 78 80 38 00 0f 85 4c 12 00 00 49 8b 9c 24 a0 03 00 00 48 89 d8 48 c1 e8 03 <0f> b6 14 28 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 c8
RSP: 0018:ffff8880a66977c0 EFLAGS: 00010203
RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83a06036
RDX: 0000000000000000 RSI: ffffffff83a06086 RDI: 0000000000000003
RBP: dffffc0000000000 R08: ffff8880a6366300 R09: 0000000000000004
R10: ffffed1015cc473a R11: ffff8880ae6239d3 R12: ffff8880a648f440
R13: 0000000000000000 R14: ffff8880a648f7cc R15: 000000000000075e
FS:  00007f9ada69d700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005615c1cbd9a8 CR3: 0000000091576000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400