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Re: [PATCH 0/8] x86-64: Properly handle the length parameter [BZ# 24097]
- From: Florian Weimer <fweimer at redhat dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: libc-alpha at sourceware dot org
- Date: Fri, 18 Jan 2019 11:50:20 +0100
- Subject: Re: [PATCH 0/8] x86-64: Properly handle the length parameter [BZ# 24097]
- References: <20190117165351.25914-1-hjl.tools@gmail.com>
* 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
identifier?
Thanks,
Florian