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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
//===-- dfsan_interceptors.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 DataFlowSanitizer.
//
// Interceptors for standard library functions.
//===----------------------------------------------------------------------===//
#include <sys/syscall.h>
#include <unistd.h>
#include "dfsan/dfsan.h"
#include "dfsan/dfsan_thread.h"
#include "interception/interception.h"
#include "sanitizer_common/sanitizer_allocator_dlsym.h"
#include "sanitizer_common/sanitizer_allocator_interface.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_errno.h"
#include "sanitizer_common/sanitizer_platform_limits_posix.h"
#include "sanitizer_common/sanitizer_posix.h"
#include "sanitizer_common/sanitizer_tls_get_addr.h"
using namespace __sanitizer;
static bool interceptors_initialized;
struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
static bool UseImpl() { return !__dfsan::dfsan_inited; }
};
INTERCEPTOR(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size) {
return __dfsan::dfsan_reallocarray(ptr, nmemb, size);
}
INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) {
void *ptr = __dfsan::dfsan_memalign(alignment, size);
if (ptr)
DTLS_on_libc_memalign(ptr, size);
return ptr;
}
INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) {
return __dfsan::dfsan_aligned_alloc(alignment, size);
}
INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
if (DlsymAlloc::Use())
return DlsymAlloc::Callocate(nmemb, size);
return __dfsan::dfsan_calloc(nmemb, size);
}
INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Realloc(ptr, size);
return __dfsan::dfsan_realloc(ptr, size);
}
INTERCEPTOR(void *, malloc, SIZE_T size) {
if (DlsymAlloc::Use())
return DlsymAlloc::Allocate(size);
return __dfsan::dfsan_malloc(size);
}
INTERCEPTOR(void, free, void *ptr) {
if (!ptr)
return;
if (DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Free(ptr);
return __dfsan::dfsan_deallocate(ptr);
}
INTERCEPTOR(void, cfree, void *ptr) {
if (!ptr)
return;
if (DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Free(ptr);
return __dfsan::dfsan_deallocate(ptr);
}
INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
CHECK_NE(memptr, 0);
int res = __dfsan::dfsan_posix_memalign(memptr, alignment, size);
if (!res)
dfsan_set_label(0, memptr, sizeof(*memptr));
return res;
}
INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) {
return __dfsan::dfsan_memalign(alignment, size);
}
INTERCEPTOR(void *, valloc, SIZE_T size) { return __dfsan::dfsan_valloc(size); }
INTERCEPTOR(void *, pvalloc, SIZE_T size) {
return __dfsan::dfsan_pvalloc(size);
}
INTERCEPTOR(void, mallinfo, __sanitizer_struct_mallinfo *sret) {
internal_memset(sret, 0, sizeof(*sret));
dfsan_set_label(0, sret, sizeof(*sret));
}
INTERCEPTOR(int, mallopt, int cmd, int value) { return 0; }
INTERCEPTOR(void, malloc_stats, void) {
// FIXME: implement, but don't call REAL(malloc_stats)!
}
INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
return __sanitizer_get_allocated_size(ptr);
}
#define ENSURE_DFSAN_INITED() \
do { \
CHECK(!__dfsan::dfsan_init_is_running); \
if (!__dfsan::dfsan_inited) { \
__dfsan::dfsan_init(); \
} \
} while (0)
#define COMMON_INTERCEPTOR_ENTER(func, ...) \
if (__dfsan::dfsan_init_is_running) \
return REAL(func)(__VA_ARGS__); \
ENSURE_DFSAN_INITED(); \
dfsan_set_label(0, __errno_location(), sizeof(int));
INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
int fd, OFF_T offset) {
if (common_flags()->detect_write_exec)
ReportMmapWriteExec(prot, flags);
if (!__dfsan::dfsan_inited)
return (void *)internal_mmap(addr, length, prot, flags, fd, offset);
COMMON_INTERCEPTOR_ENTER(mmap, addr, length, prot, flags, fd, offset);
void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
if (res != (void *)-1) {
dfsan_set_label(0, res, RoundUpTo(length, GetPageSizeCached()));
}
return res;
}
INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
int fd, OFF64_T offset) {
if (common_flags()->detect_write_exec)
ReportMmapWriteExec(prot, flags);
if (!__dfsan::dfsan_inited)
return (void *)internal_mmap(addr, length, prot, flags, fd, offset);
COMMON_INTERCEPTOR_ENTER(mmap64, addr, length, prot, flags, fd, offset);
void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
if (res != (void *)-1) {
dfsan_set_label(0, res, RoundUpTo(length, GetPageSizeCached()));
}
return res;
}
INTERCEPTOR(int, munmap, void *addr, SIZE_T length) {
if (!__dfsan::dfsan_inited)
return internal_munmap(addr, length);
COMMON_INTERCEPTOR_ENTER(munmap, addr, length);
int res = REAL(munmap)(addr, length);
if (res != -1)
dfsan_set_label(0, addr, RoundUpTo(length, GetPageSizeCached()));
return res;
}
#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
if (__dfsan::DFsanThread *t = __dfsan::GetCurrentThread()) { \
*begin = t->tls_begin(); \
*end = t->tls_end(); \
} else { \
*begin = *end = 0; \
}
#define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
dfsan_set_label(0, ptr, size)
INTERCEPTOR(void *, __tls_get_addr, void *arg) {
COMMON_INTERCEPTOR_ENTER(__tls_get_addr, arg);
void *res = REAL(__tls_get_addr)(arg);
uptr tls_begin, tls_end;
COMMON_INTERCEPTOR_GET_TLS_RANGE(&tls_begin, &tls_end);
DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, tls_begin, tls_end);
if (dtv) {
// New DTLS block has been allocated.
COMMON_INTERCEPTOR_INITIALIZE_RANGE((void *)dtv->beg, dtv->size);
}
return res;
}
namespace __dfsan {
void initialize_interceptors() {
CHECK(!interceptors_initialized);
INTERCEPT_FUNCTION(aligned_alloc);
INTERCEPT_FUNCTION(calloc);
INTERCEPT_FUNCTION(cfree);
INTERCEPT_FUNCTION(free);
INTERCEPT_FUNCTION(mallinfo);
INTERCEPT_FUNCTION(malloc);
INTERCEPT_FUNCTION(malloc_stats);
INTERCEPT_FUNCTION(malloc_usable_size);
INTERCEPT_FUNCTION(mallopt);
INTERCEPT_FUNCTION(memalign);
INTERCEPT_FUNCTION(mmap);
INTERCEPT_FUNCTION(mmap64);
INTERCEPT_FUNCTION(munmap);
INTERCEPT_FUNCTION(posix_memalign);
INTERCEPT_FUNCTION(pvalloc);
INTERCEPT_FUNCTION(realloc);
INTERCEPT_FUNCTION(reallocarray);
INTERCEPT_FUNCTION(valloc);
INTERCEPT_FUNCTION(__tls_get_addr);
INTERCEPT_FUNCTION(__libc_memalign);
interceptors_initialized = true;
}
} // namespace __dfsan
|
