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Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflow
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree() |
Date: |
Tue, 9 Apr 2019 21:28:41 +0100 |
On Tue, 9 Apr 2019 at 21:15, Alistair Francis <address@hidden> wrote:
>
> On Tue, Apr 9, 2019 at 1:08 PM Peter Maydell <address@hidden> wrote:
> >
> > On Wed, 10 Apr 2019 at 00:40, Markus Armbruster <address@hidden> wrote:
> > >
> > > If the value of get_image_size() exceeds INT_MAX / 2 - 10000, the
> > > computation of @dt_size overflows to a negative number, which then
> > > gets converted to a very large size_t for g_malloc0() and
> > > load_image_size(). In the (fortunately improbable) case g_malloc0()
> > > succeeds and load_image_size() survives, we'd assign the negative
> > > number to *sizep. What that would do to the callers I can't say, but
> > > it's unlikely to be good.
> > >
> > > Fix by rejecting images whose size would overflow.
> > >
> > > Signed-off-by: Markus Armbruster <address@hidden>
> >
> > I think this patch is missing some attributions for the
> > security researchers who found the issue initially.
> > PJP's patch for this from a couple of weeks back has a
> > reported-by credit:
> > https://patchew.org/QEMU/address@hidden/
>
> It seems like from that discussion that this patch is the correct approach.
>
> I can add the attributions and send a PR for 4.0. I'll send it by EOD
> unless anyone has any objections.
Thanks. I think given it's 21:30 here I'm going to postpone
tagging rc3 til tomorrow (mid-afternoon UK time). I'm still
hoping we can avoid an rc4...
thanks
-- PMM
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), (continued)
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Philippe Mathieu-Daudé, 2019/04/09
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), David Gibson, 2019/04/09
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Markus Armbruster, 2019/04/10
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Philippe Mathieu-Daudé, 2019/04/10
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Markus Armbruster, 2019/04/10
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Alistair Francis, 2019/04/10
- [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Philippe Mathieu-Daudé, 2019/04/10
- Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Markus Armbruster, 2019/04/11
Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Peter Maydell, 2019/04/09
Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree(), Philippe Mathieu-Daudé, 2019/04/10