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KASAN: use-after-free Read in do_general_protection
Status: upstream: reported C repro on 2018/05/26 09:16
Reported-by: syzbot+a1264132fc103340628f@syzkaller.appspotmail.com
First crash: 1461d, last: 1431d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)
duplicates (5):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
KASAN: use-after-scope Read in vmx_vcpu_run 1 1506d 1505d 0/22 closed as dup on 2018/05/26 09:26
KASAN: stack-out-of-bounds Read in unwind_next_frame C 242 587d 1436d 0/22 closed as dup on 2018/06/20 07:51
KASAN: stack-out-of-bounds Read in do_general_protection syz 11 1395d 1461d 0/22 closed as dup on 2018/05/26 09:25
KASAN: slab-out-of-bounds Read in vmx_vcpu_run 1 1478d 1474d 0/22 closed as dup on 2018/05/26 09:26
KASAN: stack-out-of-bounds Write in notify_die syz 4 1398d 1461d 0/22 closed as dup on 2018/05/26 09:26

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KASAN: use-after-free in do_general_protection+0x2ac/0x2f0 arch/x86/kernel/traps.c:539
Read of size 8 at addr ffff8801ac11f358 by task syz-executor216/4585

CPU: 1 PID: 4585 Comm: syz-executor216 Not tainted 4.18.0-rc2+ #116
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea0006b047c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffffffff06b00101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ac11f200: 00 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff
 ffff8801ac11f280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8801ac11f300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                    ^
 ffff8801ac11f380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801ac11f400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4585 Comm: syz-executor216 Tainted: G    B             4.18.0-rc2+ #116
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2018/06/24 20:08 upstream 7daf201d7fe8 2064fc5c .config log report syz C
ci-upstream-kasan-gce 2018/05/26 06:25 upstream 62d18ecfa641 f48c20b8 .config log report syz C