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Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflow
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-devel] [PATCH for-4.0-maybe] device_tree: Fix integer overflowing in load_device_tree() |
Date: |
Wed, 10 Apr 2019 07:25:43 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 4/9/19 10:08 PM, Peter Maydell 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/
Oh I missed that thread while on PTO. This answers my "how did you
figure that out?" question :)
Thanks,
Phil.
- 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(), 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 <=