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Load directly from libc, so we don't get some other malloc by mistake. #40

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Load directly from libc, so we don't get some other malloc by mistake. #40

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Empty file added .changelog/35.misc
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25 changes: 18 additions & 7 deletions filprofiler/_filpreload.c
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Original file line number Diff line number Diff line change
Expand Up @@ -83,37 +83,48 @@ static void __attribute__((constructor)) constructor() {
fprintf(stderr, "BUG: expected size of size_t and void* to be the same.\n");
exit(1);
}
underlying_real_malloc = dlsym(RTLD_NEXT, "malloc");
#ifdef __APPLE__
const char* libc_name = "libc.dylib";
#else
const char* libc_name = "libc.so.6";
#endif
void* libc = dlopen(libc_name, RTLD_LOCAL | RTLD_LAZY);
if (!libc) {
fprintf(stderr, "Couldn't load %s: %s\n", libc_name, dlerror());
exit(1);
}

underlying_real_malloc = dlsym(libc, "malloc");
if (!underlying_real_malloc) {
fprintf(stderr, "Couldn't load malloc(): %s\n", dlerror());
exit(1);
}
underlying_real_calloc = dlsym(RTLD_NEXT, "calloc");
underlying_real_calloc = dlsym(libc, "calloc");
if (!underlying_real_calloc) {
fprintf(stderr, "Couldn't load calloc(): %s\n", dlerror());
exit(1);
}
underlying_real_realloc = dlsym(RTLD_NEXT, "realloc");
underlying_real_realloc = dlsym(libc, "realloc");
if (!underlying_real_realloc) {
fprintf(stderr, "Couldn't load realloc(): %s\n", dlerror());
exit(1);
}
underlying_real_free = dlsym(RTLD_NEXT, "free");
underlying_real_free = dlsym(libc, "free");
if (!underlying_real_free) {
fprintf(stderr, "Couldn't load free(): %s\n", dlerror());
exit(1);
}
underlying_real_mmap = dlsym(RTLD_NEXT, "mmap");
underlying_real_mmap = dlsym(libc, "mmap");
if (!underlying_real_mmap) {
fprintf(stderr, "Couldn't load mmap(): %s\n", dlerror());
exit(1);
}
underlying_real_munmap = dlsym(RTLD_NEXT, "munmap");
underlying_real_munmap = dlsym(libc, "munmap");
if (!underlying_real_munmap) {
fprintf(stderr, "Couldn't load munmap(): %s\n", dlerror());
exit(1);
}
underlying_real_aligned_alloc = dlsym(RTLD_NEXT, "aligned_alloc");
underlying_real_aligned_alloc = dlsym(libc, "aligned_alloc");
if (!underlying_real_aligned_alloc) {
fprintf(stderr, "Couldn't load aligned_alloc(): %s\n", dlerror());
exit(1);
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