KASAN: null-ptr-deref Read in do_con

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: null-ptr-deref Read in do_con_trol	11	C		inconclusive	1	1914d	2034d	0/1	upstream: reported C repro on 2020/02/15 00:04
upstream	KASAN: null-ptr-deref Read in do_con_trol serial	11	C	done	error	6	1972d	2035d	0/29	closed as dup on 2020/07/20 22:49

Kernel

Title

Rank 🛈

linux-4.14

KASAN: null-ptr-deref Read in do_con_trol

inconclusive

1914d

2034d

0/1

upstream: reported C repro on 2020/02/15 00:04

upstream

KASAN: null-ptr-deref Read in do_con_trol serial

done

error

1972d

2035d

0/29

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


Created	Duration	User	Repo	Result
2020/08/12 14:30	3h19m	bisect fix	linux-4.19.y	OK (1) job log
2020/07/13 14:04	25m	bisect fix	linux-4.19.y	OK (0) job log log
2020/06/13 12:37	24m	bisect fix	linux-4.19.y	OK (0) job log log
2020/05/14 12:09	27m	bisect fix	linux-4.19.y	OK (0) job log log
2020/04/14 11:44	24m	bisect fix	linux-4.19.y	OK (0) job log log
2020/03/15 08:41	27m	bisect fix	linux-4.19.y	OK (0) job log log

audit: type=1400 audit(1581668315.933:36): avc: denied { map } for pid=8048 comm="syz-executor847" path="/root/syz-executor847156921" dev="sda1" ino=16483 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:348 [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:852 [inline] BUG: KASAN: null-ptr-deref in csi_P drivers/tty/vt/vt.c:1986 [inline] BUG: KASAN: null-ptr-deref in do_con_trol+0x3b9/0x6070 drivers/tty/vt/vt.c:2360 Read of size 4294967294 at addr 0000000000000012 by task syz-executor847/8048 CPU: 0 PID: 8048 Comm: syz-executor847 Not tainted 4.19.103-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 kasan_report_error mm/kasan/report.c:352 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x199/0x2ba mm/kasan/report.c:396 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:348 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] delete_char drivers/tty/vt/vt.c:852 [inline] csi_P drivers/tty/vt/vt.c:1986 [inline] do_con_trol+0x3b9/0x6070 drivers/tty/vt/vt.c:2360 do_con_write.part.0+0xfd5/0x1eb0 drivers/tty/vt/vt.c:2773 do_con_write drivers/tty/vt/vt.c:2541 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3110 process_output_block drivers/tty/n_tty.c:593 [inline] n_tty_write+0x3f9/0x1140 drivers/tty/n_tty.c:2331 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4404f9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffefc0bbca8 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 ==================================================================