KASAN: out-of-bounds Read in do

Title	Replies (including bot)	Last reply
[syzbot] KASAN: out-of-bounds Read in do_exit	4 (5)	2021/06/26 05:17

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: unknown-crash Read in do_exit (2) kernel				1	897d	893d	0/26	auto-closed as invalid on 2022/02/02 23:28

upstream

KASAN: unknown-crash Read in do_exit (2) kernel

897d

893d

0/26

auto-closed as invalid on 2022/02/02 23:28

================================================================== BUG: KASAN: out-of-bounds in stack_not_used include/linux/sched/task_stack.h:101 [inline] BUG: KASAN: out-of-bounds in check_stack_usage kernel/exit.c:711 [inline] BUG: KASAN: out-of-bounds in do_exit+0x1c6b/0x23d0 kernel/exit.c:869 Read of size 8 at addr ffffc90017d60400 by task loop0/31717 CPU: 0 PID: 31717 Comm: loop0 Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 print_address_description+0x5f/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x15c/0x200 mm/kasan/report.c:436 stack_not_used include/linux/sched/task_stack.h:101 [inline] check_stack_usage kernel/exit.c:711 [inline] do_exit+0x1c6b/0x23d0 kernel/exit.c:869 kthread+0x3b8/0x3c0 kernel/kthread.c:315 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Memory state around the buggy address: ffffc90017d60300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90017d60380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90017d60400: 07 07 07 07 07 07 07 07 00 00 00 00 00 00 00 00 ^ ffffc90017d60480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90017d60500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================