KASAN: null-ptr-deref Read in do_con

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	KASAN: null-ptr-deref Read in do_con_trol	11	C		done	1	1875d	2026d	1/1	fixed on 2020/08/12 22:58
upstream	KASAN: null-ptr-deref Read in do_con_trol serial	11	C	done	error	6	1963d	2026d	0/29	closed as dup on 2020/07/20 22:49

Kernel

Title

Rank 🛈

linux-4.19

KASAN: null-ptr-deref Read in do_con_trol

done

1875d

2026d

1/1

fixed on 2020/08/12 22:58

upstream

KASAN: null-ptr-deref Read in do_con_trol serial

done

error

1963d

2026d

0/29

closed as dup on 2020/07/20 22:49

Created	Duration	User	Patch	Repo	Result
2023/01/26 05:32	10m	retest repro		linux-4.14.y	report log
2022/09/08 02:27	8m	retest repro		linux-4.14.y	report log

Created

Duration

User

Patch

Repo

Result

2023/01/26 05:32

10m

retest repro

linux-4.14.y

report log

2022/09/08 02:27

retest repro

linux-4.14.y

report log


Created	Duration	User	Repo	Result
2020/07/14 05:36	31m	bisect fix	linux-4.14.y	OK (2) job log
2020/06/14 05:12	24m	bisect fix	linux-4.14.y	OK (0) job log log
2020/05/15 04:44	28m	bisect fix	linux-4.14.y	OK (0) job log log
2020/04/15 04:20	24m	bisect fix	linux-4.14.y	OK (0) job log log
2020/03/16 03:55	24m	bisect fix	linux-4.14.y	OK (0) job log log

audit: type=1400 audit(1581724839.850:36): avc: denied { map } for pid=7271 comm="syz-executor966" path="/root/syz-executor966765308" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:347 [inline] BUG: KASAN: null-ptr-deref in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: null-ptr-deref in delete_char drivers/tty/vt/vt.c:546 [inline] BUG: KASAN: null-ptr-deref in csi_P drivers/tty/vt/vt.c:1648 [inline] BUG: KASAN: null-ptr-deref in do_con_trol+0x3188/0x5b40 drivers/tty/vt/vt.c:2022 Read of size 4294967294 at addr 0000000000000012 by task syz-executor966/7271 CPU: 1 PID: 7271 Comm: syz-executor966 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 kasan_report_error mm/kasan/report.c:349 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0x127/0x2af mm/kasan/report.c:393 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 memcpy+0x24/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] delete_char drivers/tty/vt/vt.c:546 [inline] csi_P drivers/tty/vt/vt.c:1648 [inline] do_con_trol+0x3188/0x5b40 drivers/tty/vt/vt.c:2022 do_con_write.part.0+0xcc7/0x1b50 drivers/tty/vt/vt.c:2434 do_con_write drivers/tty/vt/vt.c:2205 [inline] con_write+0x38/0xc0 drivers/tty/vt/vt.c:2787 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x38b/0xf20 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4404f9 RSP: 002b:00007ffd13d27c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 RDX: 0000000000000078 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 ==================================================================