linux-kernel - Re: [PATCH 5.10 0/6] binder: backports for data leak and UAF

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Date:   Wed, 30 Nov 2022 17:33:31 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Carlos Llamas <cmllamas@...gle.com>
Cc:     stable@...nel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, Zi Fan Tan <zifantan@...gle.com>,
        Todd Kjos <tkjos@...gle.com>
Subject: Re: [PATCH 5.10 0/6] binder: backports for data leak and UAF

On Wed, Nov 30, 2022 at 04:12:59PM +0000, Carlos Llamas wrote:
> On Wed, Nov 30, 2022 at 01:42:23PM +0100, Greg Kroah-Hartman wrote:
> > On Wed, Nov 30, 2022 at 03:57:59AM +0000, Carlos Llamas wrote:
> > > This series of backports consists of 3 main patches from Todd submitted
> > > upstream in [1]. The intention is to avoid untranslated data from the
> > > senders to be visible to the target processes. More details of this
> > > issue can be found in the same thread.
> > > 
> > > Furthermore, Todd's patches also fix a use-after-free issue introduced
> > > by commit 32e9f56a96d8 ("binder: don't detect sender/target during
> > > buffer cleanup"). In which invalid userspace input causes unprocessed
> > > objects to be incorrectly released. Any subsequent references to these
> > > objects will trigger a UAF as noted by the following KASAN trace:
> > > 
> > >  [  244.748468] ==================================================================
> > >  [  244.750486] BUG: KASAN: use-after-free in binder_ioctl+0xb88/0x32e0
> > >  [  244.751276] Read of size 8 at addr ffff67b1865bea58 by task poc/593
> > >  [  244.752074] 
> > >  [  244.752725] CPU: 0 PID: 593 Comm: poc Not tainted 5.10.156 #1
> > >  [  244.753683] Hardware name: linux,dummy-virt (DT)
> > >  [  244.754717] Call trace:
> > >  [  244.755216]  dump_backtrace+0x0/0x2a0
> > >  [  244.755836]  show_stack+0x18/0x2c
> > >  [  244.756306]  dump_stack+0xf8/0x164
> > >  [  244.756807]  print_address_description.constprop.0+0x9c/0x538
> > >  [  244.757590]  kasan_report+0x120/0x200
> > >  [  244.758236]  __asan_load8+0xa0/0xc4
> > >  [  244.758756]  binder_ioctl+0xb88/0x32e0
> > >  [  244.759283]  __arm64_sys_ioctl+0xd4/0x120
> > >  [  244.759677]  el0_svc_common.constprop.0+0xac/0x270
> > >  [  244.760184]  do_el0_svc+0x38/0xa0
> > >  [  244.760540]  el0_svc+0x1c/0x2c
> > >  [  244.760898]  el0_sync_handler+0xe8/0x114
> > >  [  244.761419]  el0_sync+0x180/0x1c0
> > > 
> > > This second issue along with the reference to the commit fixing it was
> > > first reported by Zi Fan.
> > > 
> > > The other 3 commits included in this series are simply upstream fixes
> > > for the main patches.
> > > 
> > > I've tested this series applied to 5.10 and 5.4 which fixes the issues
> > > above as expected. So please pick these up for 5.10 and 5.4 stable.
> > > 
> > > [1] https://lore.kernel.org/all/20211130185152.437403-1-tkjos@google.com/
> > > 
> > > Thanks,
> > > Carlos Llamas
> > > 
> > > Cc: Zi Fan Tan <zifantan@...gle.com>
> > > Cc: Todd Kjos <tkjos@...gle.com>
> > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> 
> > 
> > All now queued up, thanks.
> > 
> > greg k-h
> 
> Thanks Greg. Could you also take this series for 5.4? I've also tested
> the fixes for that release.

Sure, all now queued up there too.

greg k-h