[PATCH 0/8] x86-64: Properly handle the length parameter [BZ# 24097]

[Florian Weimer]

* H. J. Lu:

> On Fri, Jan 18, 2019 at 2:50 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * H. J. Lu:
>>
>> > On x32, the size_t parameter may be passed in the lower 32 bits of a
>> > 64-bit register with the non-zero upper 32 bits.  The string/memory
>> > functions written in assembly can only use the lower 32 bits of a
>> > 64-bit register as length or must clear the upper 32 bits before using
>> > the full 64-bit register for length.
>> >
>> > This pach fixes string/memory functions written in assembly for x32.
>> > Tested on x86-64 and x32.  On x86-64, libc.so is the same with and
>> > withou the fix.
>>
>> Can this bug result in buffer overflows?  Should we obtain a CVE
>
> Yes, definitely.

Yuck.

>> identifier?
>>
>
> Yes, please.  Can you do that for me?

Working on it.

The issue existed since the port was introduced, correct?

Thanks,
Florian