[syzbot] KASAN: vmalloc-out-of-bounds Read in kvm_dev_ioctl

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b66b6b080000
kernel config: https://syzkaller.appspot.com/x/.config?x=c15de4ee7650fb42
dashboard link: https://syzkaller.appspot.com/bug?extid=8d24abd02cd4eb911bbd
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8d24ab...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in __list_add_valid+0x93/0xb0 lib/list_debug.c:27
Read of size 8 at addr ffffc90006b7a348 by task syz-executor.4/20901

CPU: 1 PID: 20901 Comm: syz-executor.4 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x59/0x6e9 mm/kasan/report.c:433
kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
__list_add_valid+0x93/0xb0 lib/list_debug.c:27
__list_add include/linux/list.h:69 [inline]
list_add include/linux/list.h:88 [inline]
kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1219 [inline]
kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4910 [inline]
kvm_dev_ioctl+0xf44/0x1ce0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4957
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb1fba89279
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb1fcc1e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb1fbb9bf80 RCX: 00007fb1fba89279
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004
RBP: 00007fb1fbae3189 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea48aadbf R14: 00007fb1fcc1e300 R15: 0000000000022000
</TASK>

Memory state around the buggy address:
ffffc90006b7a200: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffffc90006b7a280: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc90006b7a300: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
^
ffffc90006b7a380: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffffc90006b7a400: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================


---
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[syzbot]

> #syz dup: BUG: unable to handle kernel paging request in

can't find the dup bug

> kvm_arch_hardware_enable
>

[Paolo Bonzini]

On 8/17/22 16:30, syzbot wrote:

#syz dup: BUG: unable to handle kernel paging request in

kvm_arch_hardware_enable

[syzbot]

can't find the dup bug

> kvm_arch_hardware_enable
>

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[Sean Christopherson]

Heh, it's always some mundane detail.

#syz dup: BUG: unable to handle kernel paging request in kvm_arch_hardware_enable