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Groups > linux.kernel > #1621650
| From | Borislav Petkov <bp@suse.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [v6 PATCH 01/21] x86/mpx: Use signed variables to compute effective addresses |
| Date | 2017-04-12 00:00 +0200 |
| Message-ID | <tvbZn-4ay-5@gated-at.bofh.it> (permalink) |
| References | <tixO1-76a-3@gated-at.bofh.it> <tixO2-76a-33@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Mar 07, 2017 at 04:32:34PM -0800, Ricardo Neri wrote:
> Even though memory addresses are unsigned. The operands used to compute the
... unsigned, the operands ...
> effective address do have a sign. This is true for the r/m part of the
> ModRM byte, the base and index parts of the SiB byte as well as the
> displacement. Thus, signed variables shall be used when computing the
> effective address from these operands. Once the signed effective address
> has been computed, it is casted to an unsigned long to determine the
> linear address.
>
> Variables are renamed to better reflect the type of address being
> computed.
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
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Re: [v6 PATCH 01/21] x86/mpx: Use signed variables to compute effective addresses Borislav Petkov <bp@suse.de> - 2017-04-12 00:00 +0200
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