Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 405 by [email protected]: chdir breaks symbolization of dynamic
libraries
https://code.google.com/p/address-sanitizer/issues/detail?id=405
The program is:
// 1.c
#include <unistd.h>
#include <dlfcn.h>
int main() {
void *handle = dlopen("./s.so", RTLD_LAZY);
void (*f)() = (void (*)())dlsym(handle, "run");
chdir("/tmp"); // breaks symbolization
(*f)();
return 0;
}
// 2.c
#include <stdlib.h>
void run() {
void *p = malloc(1);
*(volatile int *)p = 42;
}
Build as:
$ clang -fsanitize=address 1.c -g
$ clang -fsanitize=address 2.c -o s.so -shared -fPIC -g
When run s.so is not symbolized:
$ ./a.out
==7130==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60200000efd0 at pc 0x7ffaeaafe7eb bp 0x7ffc4faf8500 sp 0x7ffc4faf84f8
WRITE of size 4 at 0x60200000efd0 thread T0
LLVMSymbolizer: error reading file: No such file or directory.
#0 0x7ffaeaafe7ea (s.so+0x7ea)
#1 0x4ddc24 in main /tmp/111.c:8:3
#2 0x7ffaed3e4ec4 in __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:287
#3 0x4186e5 in _start
(/usr/local/google/home/dvyukov/src/llvm/a.out+0x4186e5)
If chdir is commented out, then s.so is symbolized.
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