| Issue |
63313
|
| Summary |
Leak Sanitizer reports leaks on `sigaltstack` pointers.
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
mvanotti
|
LSAN is reporting leaks for legit uses of the `sigaltstack` .
See the following example:
```c++
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
constexpr size_t kSigaltstackSize = 0x1000 * 10;
int main(void) {
uintptr_t new_sigaltstack =
reinterpret_cast<uintptr_t>(malloc(kSigaltstackSize)) + kSigaltstackSize;
stack_t ss = {.ss_sp = reinterpret_cast<void *>(new_sigaltstack),
.ss_flags = 0,
.ss_size = kSigaltstackSize};
sigaltstack(&ss, NULL);
return 0;
}
```
compiled with `clang++ -fsanitize=leak program.cc -o program`
Returns:
```
=================================================================
==407264==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 40960 byte(s) in 1 object(s) allocated from:
#0 0x5607c7b1df32 in malloc (/home/user/program+0x2ff32) (BuildId: 1fd845c27ab0d578242521bcf8e1508798c8bbcd)
#1 0x5607c7b20688 in main (/home/user/program+0x32688) (BuildId: 1fd845c27ab0d578242521bcf8e1508798c8bbcd)
#2 0x7fed3d367189 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:10:10
SUMMARY: LeakSanitizer: 40960 byte(s) leaked in 1 allocation(s).
```
Would it be possible for LSAN to treat the sigaltstack as a global variable?
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