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How does this milw0rm heap spraying exploit work?
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The shellcode contains some x86 assembly instructions that will do the actual exploit. spray creates a long sequence of instructions that will be put in memory. Since we can't usually find out the exact location of our shellcode in memory, we put a lot o...
Setup a Git server with msysgit on Windows [closed]
...pSsh and Windows home directory):
gitpath='/cygdrive/c/Program Files (x86)/Git/bin'
gitcorepath='cygdrive/c/Program Files (x86)/Git/libexec/git-core'
PATH=${gitpath}:${gitcorepath}:${PATH}
Here's what I added to the bash profile (in CopSsh etc/profile):
gitpath='/c/Program Fi...
When is assembly faster than C?
...n do is to promote the integers to 64 bit and do a 64*64 = 64 multiply.
x86 (and ARM, MIPS and others) can however do the multiply in a single instruction. Some compilers used to ignore this fact and generate code that calls a runtime library function to do the multiply. The shift by 16 is also of...
What is a bus error?
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Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt the memory access requested, typically:
using a processor instruction with an address that does not satisfy its alignment requirements.
Segmentation faults occur when a...
WAMP shows error 'MSVCR100.dll' is missing when install
...osoft.com/en-us/download/details.aspx?id=30679
There you can select the x86 or x64 version depending on your system
This article on the WampServer forums shows all the Microsoft Visual C++ runtime libraries you need to have installed on your system for each version of WampServer. To quote:
F...
0.1 float is greater than 0.1 double. I expected it to be false [duplicate]
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@JamesKanze: This is on a x86 machine. Python uses native floating-point operations, and the x86 implementation (more or less) conforms to IEEE-754.
– Sven Marnach
Oct 10 '13 at 10:03
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Floating point vs integer calculations on modern hardware
...strongly from processor to processor (even within the same family such as x86) because different processors have different "pipeline" lengths. Also, some operations are generally very simple (such as addition) and have an accelerated route through the processor, and others (such as division) take m...
Why do x86-64 systems have only a 48 bit virtual address space?
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@bdares: Bad analogy. The 8088/8086 arch's instruction set has a 640k limit built into it. Only making a new ISA (386) was it possible to break the barrier. x86_64 on the other hand supports all 64 bits in the ISA. It's just the current-generation hardware t...
How do I find the PublicKeyToken for a particular dll?
...ically be found at one of the following locations under C:\Program Files (x86)\Microsoft SDKs\Windows: C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin, C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\x64, C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools
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The point of test %eax %eax [duplicate]
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namely? The list of x86 instructions is on Wikipedia, which also links a spec by Intel as well as another (quite readable) reference on wayback machine. A tutorial is also available on Wikibooks.
– John Dvorak
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