linux-kernel - Re: [Linux-6.12.y] XEN: CVE-2024-53241 / XSA-466 and Clang-kCFI

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Message-ID: <CA+icZUUnbY7eRZtN-pMNn0jhYKLLEWEDNmJjhGQ3auPuS9_+MQ@mail.gmail.com>
Date: Tue, 24 Dec 2024 17:23:45 +0100
From: Sedat Dilek <sedat.dilek@...il.com>
To: Andrew Cooper <andrew.cooper3@...rix.com>
Cc: Juergen Gross <jgross@...e.com>, Peter Zijlstra <peterz@...radead.org>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Jan Beulich <jbeulich@...e.com>, 
	Josh Poimboeuf <jpoimboe@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Sasha Levin <sashal@...nel.org>, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	Kees Cook <kees@...nel.org>, Nathan Chancellor <nathan@...nel.org>, llvm@...ts.linux.dev, 
	xen-devel <xen-devel@...ts.xenproject.org>, 1091360@...s.debian.org
Subject: Re: [Linux-6.12.y] XEN: CVE-2024-53241 / XSA-466 and Clang-kCFI

On Sun, Dec 22, 2024 at 11:37 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> On Sat, Dec 21, 2024 at 10:31 PM Andrew Cooper
> <andrew.cooper3@...rix.com> wrote:
> >
> > On 21/12/2024 6:25 pm, Sedat Dilek wrote:
> > > With...
> > >
> > > dileks@...za:~/src/xtf/git$ mv tests/xsa-454 ../
> > > dileks@...za:~/src/xtf/git$ mv tests/xsa-consoleio-write ../
> >
> > That's completely bizzare.   There's nothing interestingly different
> > with those two tests vs the others.
> >
> > I take it the crash is repeatable when using either of these?
> >
> > ~Andrew
>
> This time I stopped SDDM and thus KDE-6/Wayland session.
>
> Tested with Debian's officially 6.12.6-amd64 kernel in VT-3.
>
> test-hvm32pae-xsa-consoleio-write SUCCESS <--- 1st time I tried, never
> said this is not OK
>
> test-hvm64-xsa-454 leads to FROZEN system and DATA LOSS (here: ext4).
> Reproducibly as told many times.- in Debian and selfmade kernels version 6.12.6.
>
> Stolen from the picture I took with my smartphone:
>
> sudo ./xft-runner test-hvm64-xsa-454
>
> Executing 'xl create -p tests/xsa-454/test-hvm64-xsa-454.cfg'
> Executing 'xl console test-hvm64-xsa-454'
> Executing 'xl unpause test-hvm64-xsa-454'
>
> ^^ System does NOT react!
>
> I can send you the picture on request.
>
> -Sedat-

[ CC 1091360@...s.debian.org ]

I upgraded to Xen version 4.19.1 in Debian/unstable AMD64.

# xl info | egrep 'release|version|commandline|caps'
release                : 6.12.6-amd64
version                : #1 SMP PREEMPT_DYNAMIC Debian 6.12.6-1 (2024-12-21)
hw_caps                :
bfebfbff:17bae3bf:28100800:00000001:00000001:00000000:00000000:00000100
virt_caps              : pv hvm hap shadow gnttab-v1 gnttab-v2
xen_version            : 4.19.1
xen_caps               : xen-3.0-x86_64 hvm-3.0-x86_32 hvm-3.0-x86_32p
hvm-3.0-x86_64
xen_commandline        : placeholder

dileks@...za:~/src/xtf/git$ sudo ./xtf-runner --host test-hvm64-xsa-454
Executing 'xl create -p tests/xsa-454/test-hvm64-xsa-454.cfg'
Executing 'xl console test-hvm64-xsa-454'
Executing 'xl unpause test-hvm64-xsa-454'
--- Xen Test Framework ---
Environment: HVM 64bit (Long mode 4 levels)
XSA-454 PoC
Success: Not vulnerable to XSA-454
Test result: SUCCESS

Combined test results:
test-hvm64-xsa-454                       SUCCESS

root@...za:~# LC_ALL=C ll /var/log/xen/*xsa-454*.log
-rw-r--r-- 1 root adm 232 Dec 24 17:11
/var/log/xen/qemu-dm-test-hvm64-xsa-454.log
-rw-r--r-- 1 root adm 232 Dec 24 17:11 /var/log/xen/xl-test-hvm64-xsa-454.log

root@...za:~# cat /var/log/xen/qemu-dm-test-hvm64-xsa-454.log
VNC server running on 127.0.0.1:5900
xen-qemu-system-i386: failed to create 'console' device '0': declining
to handle console type 'xenconsoled'
xen-qemu-system-i386: terminating on signal 1 from pid 6302
(/usr/lib/xen-4.19/bin/xl)

root@...za:~# cat /var/log/xen/xl-test-hvm64-xsa-454.log
Waiting for domain test-hvm64-xsa-454 (domid 144) to die [pid 6302]
Domain 144 has shut down, reason code 0 0x0
Action for shutdown reason code 0 is destroy
Domain 144 needs to be cleaned up: destroying the domain
Done. Exiting now

Due to Debian-Bug #1091360 ("qemu-system-xen: Build against libxen-dev
version 4.19.1-1") I am not able to do the full XFT tests.

-Sedat-

Link: https://bugs.debian.org/1091360