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Re: [Xen-devel] [PATCH] xen/build-id: Fix xen_build_id_check() to be robust against malformed notes
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 7 Jan 2019 17:34:30 +0000
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- Cc: Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 07 Jan 2019 17:34:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 07/01/2019 10:36, Jan Beulich wrote:
>>>> On 31.12.18 at 18:34, <andrew.cooper3@xxxxxxxxxx> wrote:
>> A NT_GNU_BUILD_ID with namesz longer than 4 will cause the strncmp() to use
>> bytes in adjacent stringtable entries.
>>
>> Instead, check for namesz exactly equal to 4,
> Is that a requirement spelled out anywhere? Till now I've been
> under the impression that e.g. 8 bytes of name are fine as well,
> as long as the first four of them are "GNU\0".
No idea, but if this is true then we've got bigger problems with parsing
the notes.
~Andrew
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