blob: 4f9ba52cf47d17c15bb5a0dc0a94b18ecc2ca5e8 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
//===-- 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
|
