this repo has no description
wrapgen: Fix address resolution in dynamic section
The values are addresses which aren't necessarily equal to file
offsets.
+21
-2
+21
-2
src/libelfloader/wrapgen/wrapgen.cpp
+21
-2
src/libelfloader/wrapgen/wrapgen.cpp
···
26
26
void parse_elf(const char* elf, std::string& soname_out, std::set<std::string>& functions_out, std::set<std::string>& vars_out);
27
27
void generate_wrapper(std::ofstream& output, const char* soname, const std::set<std::string>& symbols);
28
28
void generate_var_wrappers(std::ofstream& output, std::ofstream& outputHeader, const std::set<std::string>& vars);
29
+
Elf64_Off vaddr_to_offset(const Elf64_Ehdr* ehdr, Elf64_Addr vaddr);
29
30
30
31
int main(int argc, const char** argv)
31
32
{
···
168
169
switch (dyn->d_tag)
169
170
{
170
171
case DT_STRTAB:
171
-
off_strtab = dyn->d_un.d_val;
172
+
off_strtab = vaddr_to_offset(ehdr, dyn->d_un.d_val);
172
173
break;
173
174
case DT_SONAME:
174
-
off_soname = dyn->d_un.d_val;
175
+
off_soname = vaddr_to_offset(ehdr, dyn->d_un.d_val);
175
176
break;
176
177
case DT_NULL:
177
178
goto end_dyn;
···
298
299
"}\n"
299
300
"#endif\n\n";
300
301
}
302
+
303
+
Elf64_Off vaddr_to_offset(const Elf64_Ehdr* ehdr, Elf64_Xword vaddr)
304
+
{
305
+
for (int i = 0; i < ehdr->e_phnum; i++)
306
+
{
307
+
const Elf64_Phdr* phdr;
308
+
Elf64_Addr vstart, vend;
309
+
310
+
phdr = (const Elf64_Phdr*) (((char*) ehdr) + ehdr->e_phoff + (i * ehdr->e_phentsize));
311
+
vstart = phdr->p_vaddr;
312
+
vend = phdr->p_vaddr + phdr->p_memsz;
313
+
if (vstart <= vaddr && vaddr < vend) {
314
+
return phdr->p_offset + vaddr - vstart;
315
+
}
316
+
}
317
+
318
+
return 0;
319
+
}