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I loaded a binary into Ghidra for analysis. The decompiler says undefined8 main(void) { basic_ostream *pbVar1; char *pcVar2; [--snip--] pbVar1 = std::operator<<(pbVar1,"PXZ ");...
#3: Post edited
by
Alexei
·
2023-11-30T16:45:53Z (about 1 year ago)
removed tag scheduled for removal
#2: Post edited
by
Alexei
·
2023-11-12T18:57:30Z (about 1 year ago)
highlighted the problem the question is about
- I loaded a binary into Ghidra for analysis.
- The decompiler says
- ```
- undefined8 main(void)
- {
- basic_ostream *pbVar1;
- char *pcVar2;
- [--snip--]
- pbVar1 = std::operator<<(pbVar1,"PXZ ");
- pcVar2 = (char *)std::__cxx11::basic_string<>::c_str();
- pbVar1 = std::operator<<(pbVar1,pcVar2);
- pbVar1 = std::operator<<(pbVar1,"<<");
- std::basic_ostream<>::operator<<((basic_ostream<> *)pbVar1,std::endl<>);
- }
- ```
I'm clueless about the meaning of the `pcVar2 =` line. I would expect `c_str` to be the method of some given string, [e.g.](https://en.cppreference.com/w/cpp/string/basic_string/c_str) `std::string const s("Emplary"); const char* p = s.c_str();`, but what is that string in the present case?- I can confirm that something is getting inserted as the binary prints "PXZ AX1<<", but it's hard to figure whence exactly this middle part is coming.
- I loaded a binary into Ghidra for analysis.
- The decompiler says
- ```
- undefined8 main(void)
- {
- basic_ostream *pbVar1;
- char *pcVar2;
- [--snip--]
- pbVar1 = std::operator<<(pbVar1,"PXZ ");
- pcVar2 = (char *)std::__cxx11::basic_string<>::c_str();
- pbVar1 = std::operator<<(pbVar1,pcVar2);
- pbVar1 = std::operator<<(pbVar1,"<<");
- std::basic_ostream<>::operator<<((basic_ostream<> *)pbVar1,std::endl<>);
- }
- ```
- **I'm clueless about the meaning of the `pcVar2 =` line**. I would expect `c_str` to be the method of some given string, [e.g.](https://en.cppreference.com/w/cpp/string/basic_string/c_str) `std::string const s("Emplary"); const char* p = s.c_str();`, but what is that string in the present case?
- I can confirm that something is getting inserted as the binary prints "PXZ AX1<<", but it's hard to figure whence exactly this middle part is coming.
#1: Initial revision
by
nteodosio
·
2023-11-12T16:12:58Z (about 1 year ago)
Ghidra decompiler: c_str() used in phantom string?
I loaded a binary into Ghidra for analysis.
The decompiler says
```
undefined8 main(void)
{
basic_ostream *pbVar1;
char *pcVar2;
[--snip--]
pbVar1 = std::operator<<(pbVar1,"PXZ ");
pcVar2 = (char *)std::__cxx11::basic_string<>::c_str();
pbVar1 = std::operator<<(pbVar1,pcVar2);
pbVar1 = std::operator<<(pbVar1,"<<");
std::basic_ostream<>::operator<<((basic_ostream<> *)pbVar1,std::endl<>);
}
```
I'm clueless about the meaning of the `pcVar2 =` line. I would expect `c_str` to be the method of some given string, [e.g.](https://en.cppreference.com/w/cpp/string/basic_string/c_str) `std::string const s("Emplary"); const char* p = s.c_str();`, but what is that string in the present case?
I can confirm that something is getting inserted as the binary prints "PXZ AX1<<", but it's hard to figure whence exactly this middle part is coming.