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$c vsnprintf etc. linked to garbage?

 
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myocytebd2
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Joined: 23 Apr 2015
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PostPosted: Mon Mar 28, 2022 12:05 pm    Post subject: $c vsnprintf etc. linked to garbage? Reply with quote
(CE7.4 ia32)
vsnprintf is an inlined wrapper, and then call to ntdll._vsnprintf, which appears to be 64-bit 7FFEFE7DDA90.
And relocation is filled with lower bits garbage.
Code:
_vsnprintf - FF 25 D802F211        - jmp dword ptr [IAT._vsnprintf]  ; FE7DDA90

(And it is not the only one)

So it seems that all the headers are broken and usable.
stdlib.h/math.h directly breaks linking and make AA unable to toggle.
stdio.h/string.h has wrong wrappers and dangling linking.
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Dark Byte
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PostPosted: Mon Mar 28, 2022 2:53 pm    Post subject: Reply with quote
I only recommend using the include files for structure definitions, not function declarations. For function declaration I recommend defining them yourself to prevent issues that come from header files that assume it's a normal mingw C environment, which this is not (I mean, most of the include files outright don't even work on 64-bit )


anyhow, in this case you can bypass the issue by defining __NO_ISOCEXT before as vsnprintf does exist in ntdll , so the inline code isn't needed
Code:

#define __NO_ISOCEXT
#include <stdio.h>

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