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c32b58873a
The calculation for TLS relocations was incorrect which would
result in overlapping TLS variables when more than one shared
object used TLS variables.
This bug can be reproduced with a shared library and a program
like this:
$ cat tlstest.c
#include <string.h>
__thread char tls_val[1024];
void set_val() { memset(tls_val, 0, sizeof(tls_val)); }
$ gcc -g -shared -o usr/lib/libtlstest.so tlstest.c
$ cat test.c
void set_val();
int main() { set_val(); }
$ gcc -g -o tls test.c -ltlstest
Due to the way the TLS relocations are done this program would
clobber libc's TLS variables (e.g. errno).
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|---|---|---|
| .. | ||
| Arch/i386 | ||
| AuxiliaryVector.h | ||
| CMakeLists.txt | ||
| CoreDump.h | ||
| DynamicLinker.cpp | ||
| DynamicLinker.h | ||
| DynamicLoader.cpp | ||
| DynamicLoader.h | ||
| DynamicObject.cpp | ||
| DynamicObject.h | ||
| Hashes.h | ||
| Image.cpp | ||
| Image.h | ||
| Validation.cpp | ||
| Validation.h | ||