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Re: Best way to patch exeDSP?
Posted: Sun Feb 14, 2016 3:32 pm
by sectroyer
YES. Because _ZN7CCDebug5ResetEv is exeDSP symbol and NOT libahas.so
To get this you need to dlopen exeDSP, like this:
Re: Best way to patch exeDSP?
Posted: Tue Feb 16, 2016 11:28 pm
by Neoplane
I can dopen(0, RTLD_LAZY), but after that I'm still unable to dlopen(libahas.so, RTLD_LAZY), and also unable to get a handle on dlsym(h, myFunction).
I'm getting a handle at 0x400266d0 for dlopen(0), but my patching point it's at 0x41ec9c40. I think that it's too far to be confident that I'm getting the correct patch point, isn't it?
Any other clues?
Re: Best way to patch exeDSP?
Posted: Wed Feb 17, 2016 8:21 am
by sectroyer
ehhh I am getting confused
Better paste part of your code that does this dlopen/dlsym dance
Re: Best way to patch exeDSP?
Posted: Fri Feb 19, 2016 12:02 am
by Neoplane
Here's code
Code: Select all
void *ldl1 = dlopen(0, RTLD_LAZY);
if(debug)
{
printf("dlopen 0 at: 0x%08x\n", ldl1);
}
unsigned char *lib = "/mtd_exe/Comp_LIB/libahas.so";
void *ldl = dlopen(lib, RTLD_LAZY);
if(debug)
{
if(!ldl)
{
printf("dlopen libahas failed: '%s'.\n", dlerror());
}
else
{
printf("dlopen libahas at: 0x%08x\n", ldl);
}
}
unsigned char *fn_name = "_ZN4hass16AppleDataHandler12readMetadataERKSsPNS_12IArrayBufferERbi";
addr=dlsym(ldl1, fn_name);
if(!addr)
{
printf("dlsym '%s' failed.\n", fn_name);
return 0;
}
else
printf("Found %s location at: 0x%08x\n",fn_name,addr);
And this is output:
Code: Select all
dlopen 0 at: 0x400266d0
dlopen libahas failed: '/mtd_exe/Comp_LIB/libahas.so: undefined symbol: _ZN7CCDebug5ResetEv'.
dlsym '_ZN4hass16AppleDataHandler12readMetadataERKSsPNS_12IArrayBufferERbi' failed.
I need to patch on:
0x41EC9C40 BNE 0x41ec950c <_ZN4hass16AppleDataHandler12readMetadataERKSsPNS_12IArrayBufferERbi+788> <<<<< PATCH
What I mean is, dlopen 0 it's getting too far from patching point, and dlopen libahas it's failing.
Re: Best way to patch exeDSP?
Posted: Fri Feb 19, 2016 10:49 am
by sectroyer
change ldl1 to ldl and report results