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//===-- msan_dl.cpp -------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of MemorySanitizer.
//
// Helper functions for unpoisoning results of dladdr and dladdr1.
//===----------------------------------------------------------------------===//
#include "msan_dl.h"
#include <dlfcn.h>
#include <elf.h>
#include <link.h>
#include "msan_poisoning.h"
namespace __msan {
void UnpoisonDllAddrInfo(void *info) {
Dl_info *ptr = (Dl_info *)(info);
__msan_unpoison(ptr, sizeof(*ptr));
if (ptr->dli_fname)
__msan_unpoison(ptr->dli_fname, internal_strlen(ptr->dli_fname) + 1);
if (ptr->dli_sname)
__msan_unpoison(ptr->dli_sname, internal_strlen(ptr->dli_sname) + 1);
}
#if SANITIZER_GLIBC
void UnpoisonDllAddr1ExtraInfo(void **extra_info, int flags) {
if (flags == RTLD_DL_SYMENT) {
__msan_unpoison(extra_info, sizeof(void *));
ElfW(Sym) *s = *((ElfW(Sym) **)(extra_info));
__msan_unpoison(s, sizeof(ElfW(Sym)));
} else if (flags == RTLD_DL_LINKMAP) {
__msan_unpoison(extra_info, sizeof(void *));
struct link_map *map = *((struct link_map **)(extra_info));
// Walk forward
for (auto *ptr = map; ptr; ptr = ptr->l_next) {
__msan_unpoison(ptr, sizeof(struct link_map));
if (ptr->l_name)
__msan_unpoison(ptr->l_name, internal_strlen(ptr->l_name) + 1);
}
if (!map)
return;
// Walk backward
for (auto *ptr = map->l_prev; ptr; ptr = ptr->l_prev) {
__msan_unpoison(ptr, sizeof(struct link_map));
if (ptr->l_name)
__msan_unpoison(ptr->l_name, internal_strlen(ptr->l_name) + 1);
}
}
}
#endif
} // namespace __msan
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