blob: 953bbad96eb4709c40234994048bf8a5db23f960 (
plain)
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
|
//===-- interception_aix.cpp ------------------------------------*- C++ -*-===//
//
// 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 AddressSanitizer, an address sanity checker.
//
// AIX-specific interception methods.
//===----------------------------------------------------------------------===//
#include "interception.h"
#include "sanitizer_common/sanitizer_common.h"
#if SANITIZER_AIX
# include <dlfcn.h> // for dlsym()
namespace __interception {
static void *GetFuncAddr(const char *name, uptr wrapper_addr) {
// AIX dlsym can only defect the functions that are exported, so
// on AIX, we can not intercept some basic functions like memcpy.
// FIXME: if we are going to ship dynamic asan library, we may need to search
// all the loaded modules with RTLD_DEFAULT if RTLD_NEXT failed.
void *addr = dlsym(RTLD_NEXT, name);
// In case `name' is not loaded, dlsym ends up finding the actual wrapper.
// We don't want to intercept the wrapper and have it point to itself.
if ((uptr)addr == wrapper_addr)
addr = nullptr;
return addr;
}
bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
uptr wrapper) {
void *addr = GetFuncAddr(name, wrapper);
*ptr_to_real = (uptr)addr;
return addr && (func == wrapper);
}
} // namespace __interception
#endif // SANITIZER_AIX
|
