Re: [syzbot] [kvm?] KMSAN: uninit-value in em_ret_far

[Sean Christopherson]

On Tue, Jan 09, 2024, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    2cf4f94d8e86 Merge tag 'scsi-fixes' of git://git.kernel.or..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=144e8d01e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4a65fa9f077ead01
> dashboard link: https://syzkaller.appspot.com/bug?extid=579eb95e588b48b4499c
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/589557edbfd5/disk-2cf4f94d.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/f2480533f00e/vmlinux-2cf4f94d.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/9463e8eac2ed/bzImage-2cf4f94d.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+579eb95e588b48b4499c@xxxxxxxxxxxxxxxxxxxxxxxxx

#syz fix: KVM: x86: Clean up partially uninitialized integer in emulate_pop()