invalid address with mpx instruction

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CandyMan

Joined: 04 Sep 2009
Posts: 413
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop

CandyMan 14 Jun 2016, 15:55

Code:

use64
bndldx bnd0,[rbx+16] ;fine
bndldx bnd0,[ebx+16] ;invalid address

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14 Jun 2016, 15:55

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8351
Location: Kraków, Poland

Tomasz Grysztar 14 Jun 2016, 17:19

Intel® Architecture Instruction Set Extensions Programming Reference, 319433-015 (July 2013) wrote:

In 64-bit Mode, all Intel MPX instructions use 64-bit operands for bounds and 64 bit addressing, i.e. REX.W & 67H have no effect on data or address size.

It's in the section "9.3.10 Intel MPX and Operating Modes".

14 Jun 2016, 17:19

CandyMan

Joined: 04 Sep 2009
Posts: 413
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop

CandyMan 14 Jun 2016, 17:57

I leaned on nasm which 0x67 prefix allows...

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14 Jun 2016, 17:57

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 15 Jun 2016, 01:29

CandyMan wrote:

I leaned on nasm which 0x67 prefix allows...

NASM has many things that it doesn't do properly. The source manuals are the place to go when one wants to be sure of something.

15 Jun 2016, 01:29

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