1 | // RUN: %clang_analyze_cc1 -analyzer-checker=alpha.security.taint,core,alpha.security.ArrayBoundV2 -Wno-format-security -verify %s |
2 | // RUN: %clang_analyze_cc1 -DFILE_IS_STRUCT -analyzer-checker=alpha.security.taint,core,alpha.security.ArrayBoundV2 -Wno-format-security -verify %s |
3 | |
4 | int scanf(const char *restrict format, ...); |
5 | char *gets(char *str); |
6 | int getchar(void); |
7 | |
8 | typedef struct _FILE FILE; |
9 | #ifdef FILE_IS_STRUCT |
10 | extern struct _FILE *stdin; |
11 | #else |
12 | extern FILE *stdin; |
13 | #endif |
14 | |
15 | int fscanf(FILE *restrict stream, const char *restrict format, ...); |
16 | int sprintf(char *str, const char *format, ...); |
17 | void setproctitle(const char *fmt, ...); |
18 | typedef __typeof(sizeof(int)) size_t; |
19 | |
20 | // Define string functions. Use builtin for some of them. They all default to |
21 | // the processing in the taint checker. |
22 | #define strcpy(dest, src) \ |
23 | ((__builtin_object_size(dest, 0) != -1ULL) \ |
24 | ? __builtin___strcpy_chk (dest, src, __builtin_object_size(dest, 1)) \ |
25 | : __inline_strcpy_chk(dest, src)) |
26 | |
27 | static char *__inline_strcpy_chk (char *dest, const char *src) { |
28 | return __builtin___strcpy_chk(dest, src, __builtin_object_size(dest, 1)); |
29 | } |
30 | char *stpcpy(char *restrict s1, const char *restrict s2); |
31 | char *strncpy( char * destination, const char * source, size_t num ); |
32 | char *strndup(const char *s, size_t n); |
33 | char *strncat(char *restrict s1, const char *restrict s2, size_t n); |
34 | |
35 | void *malloc(size_t); |
36 | void *calloc(size_t nmemb, size_t size); |
37 | void bcopy(void *s1, void *s2, size_t n); |
38 | |
39 | #define BUFSIZE 10 |
40 | |
41 | int Buffer[BUFSIZE]; |
42 | void bufferScanfDirect(void) |
43 | { |
44 | int n; |
45 | scanf("%d", &n); |
46 | Buffer[n] = 1; // expected-warning {{Out of bound memory access }} |
47 | } |
48 | |
49 | void bufferScanfArithmetic1(int x) { |
50 | int n; |
51 | scanf("%d", &n); |
52 | int m = (n - 3); |
53 | Buffer[m] = 1; // expected-warning {{Out of bound memory access }} |
54 | } |
55 | |
56 | void bufferScanfArithmetic2(int x) { |
57 | int n; |
58 | scanf("%d", &n); |
59 | int m = 100 - (n + 3) * x; |
60 | Buffer[m] = 1; // expected-warning {{Out of bound memory access }} |
61 | } |
62 | |
63 | void bufferScanfAssignment(int x) { |
64 | int n; |
65 | scanf("%d", &n); |
66 | int m; |
67 | if (x > 0) { |
68 | m = n; |
69 | Buffer[m] = 1; // expected-warning {{Out of bound memory access }} |
70 | } |
71 | } |
72 | |
73 | void scanfArg() { |
74 | int t = 0; |
75 | scanf("%d", t); // expected-warning {{format specifies type 'int *' but the argument has type 'int'}} |
76 | } |
77 | |
78 | void bufferGetchar(int x) { |
79 | int m = getchar(); |
80 | Buffer[m] = 1; //expected-warning {{Out of bound memory access (index is tainted)}} |
81 | } |
82 | |
83 | void testUncontrolledFormatString(char **p) { |
84 | char s[80]; |
85 | fscanf(stdin, "%s", s); |
86 | char buf[128]; |
87 | sprintf(buf,s); // expected-warning {{Uncontrolled Format String}} |
88 | setproctitle(s, 3); // expected-warning {{Uncontrolled Format String}} |
89 | |
90 | // Test taint propagation through strcpy and family. |
91 | char scpy[80]; |
92 | strcpy(scpy, s); |
93 | sprintf(buf,scpy); // expected-warning {{Uncontrolled Format String}} |
94 | |
95 | stpcpy(*(++p), s); // this generates __inline. |
96 | setproctitle(*(p), 3); // expected-warning {{Uncontrolled Format String}} |
97 | |
98 | char spcpy[80]; |
99 | stpcpy(spcpy, s); |
100 | setproctitle(spcpy, 3); // expected-warning {{Uncontrolled Format String}} |
101 | |
102 | char *spcpyret; |
103 | spcpyret = stpcpy(spcpy, s); |
104 | setproctitle(spcpyret, 3); // expected-warning {{Uncontrolled Format String}} |
105 | |
106 | char sncpy[80]; |
107 | strncpy(sncpy, s, 20); |
108 | setproctitle(sncpy, 3); // expected-warning {{Uncontrolled Format String}} |
109 | |
110 | char *dup; |
111 | dup = strndup(s, 20); |
112 | setproctitle(dup, 3); // expected-warning {{Uncontrolled Format String}} |
113 | |
114 | } |
115 | |
116 | int system(const char *command); |
117 | void testTaintSystemCall() { |
118 | char buffer[156]; |
119 | char addr[128]; |
120 | scanf("%s", addr); |
121 | system(addr); // expected-warning {{Untrusted data is passed to a system call}} |
122 | |
123 | // Test that spintf transfers taint. |
124 | sprintf(buffer, "/bin/mail %s < /tmp/email", addr); |
125 | system(buffer); // expected-warning {{Untrusted data is passed to a system call}} |
126 | } |
127 | |
128 | void testTaintSystemCall2() { |
129 | // Test that snpintf transfers taint. |
130 | char buffern[156]; |
131 | char addr[128]; |
132 | scanf("%s", addr); |
133 | __builtin_snprintf(buffern, 10, "/bin/mail %s < /tmp/email", addr); |
134 | system(buffern); // expected-warning {{Untrusted data is passed to a system call}} |
135 | } |
136 | |
137 | void testTaintSystemCall3() { |
138 | char buffern2[156]; |
139 | int numt; |
140 | char addr[128]; |
141 | scanf("%s %d", addr, &numt); |
142 | __builtin_snprintf(buffern2, numt, "/bin/mail %s < /tmp/email", "abcd"); |
143 | system(buffern2); // expected-warning {{Untrusted data is passed to a system call}} |
144 | } |
145 | |
146 | void testGets() { |
147 | char str[50]; |
148 | gets(str); |
149 | system(str); // expected-warning {{Untrusted data is passed to a system call}} |
150 | } |
151 | |
152 | void testTaintedBufferSize() { |
153 | size_t ts; |
154 | scanf("%zd", &ts); |
155 | |
156 | int *buf1 = (int*)malloc(ts*sizeof(int)); // expected-warning {{Untrusted data is used to specify the buffer size}} |
157 | char *dst = (char*)calloc(ts, sizeof(char)); //expected-warning {{Untrusted data is used to specify the buffer size}} |
158 | bcopy(buf1, dst, ts); // expected-warning {{Untrusted data is used to specify the buffer size}} |
159 | __builtin_memcpy(dst, buf1, (ts + 4)*sizeof(char)); // expected-warning {{Untrusted data is used to specify the buffer size}} |
160 | |
161 | // If both buffers are trusted, do not issue a warning. |
162 | char *dst2 = (char*)malloc(ts*sizeof(char)); // expected-warning {{Untrusted data is used to specify the buffer size}} |
163 | strncat(dst2, dst, ts); // no-warning |
164 | } |
165 | |
166 | #define AF_UNIX 1 /* local to host (pipes) */ |
167 | #define AF_INET 2 /* internetwork: UDP, TCP, etc. */ |
168 | #define AF_LOCAL AF_UNIX /* backward compatibility */ |
169 | #define SOCK_STREAM 1 |
170 | int socket(int, int, int); |
171 | size_t read(int, void *, size_t); |
172 | int execl(const char *, const char *, ...); |
173 | |
174 | void testSocket() { |
175 | int sock; |
176 | char buffer[100]; |
177 | |
178 | sock = socket(AF_INET, SOCK_STREAM, 0); |
179 | read(sock, buffer, 100); |
180 | execl(buffer, "filename", 0); // expected-warning {{Untrusted data is passed to a system call}} |
181 | |
182 | sock = socket(AF_LOCAL, SOCK_STREAM, 0); |
183 | read(sock, buffer, 100); |
184 | execl(buffer, "filename", 0); // no-warning |
185 | |
186 | sock = socket(AF_INET, SOCK_STREAM, 0); |
187 | // References to both buffer and &buffer as an argument should taint the argument |
188 | read(sock, &buffer, 100); |
189 | execl(buffer, "filename", 0); // expected-warning {{Untrusted data is passed to a system call}} |
190 | } |
191 | |
192 | void testStruct() { |
193 | struct { |
194 | char buf[16]; |
195 | int length; |
196 | } tainted; |
197 | |
198 | char buffer[16]; |
199 | int sock; |
200 | |
201 | sock = socket(AF_INET, SOCK_STREAM, 0); |
202 | read(sock, &tainted, sizeof(tainted)); |
203 | __builtin_memcpy(buffer, tainted.buf, tainted.length); // expected-warning {{Untrusted data is used to specify the buffer size}} |
204 | } |
205 | |
206 | void testStructArray() { |
207 | struct { |
208 | int length; |
209 | } tainted[4]; |
210 | |
211 | char dstbuf[16], srcbuf[16]; |
212 | int sock; |
213 | |
214 | sock = socket(AF_INET, SOCK_STREAM, 0); |
215 | __builtin_memset(srcbuf, 0, sizeof(srcbuf)); |
216 | |
217 | read(sock, &tainted[0], sizeof(tainted)); |
218 | __builtin_memcpy(dstbuf, srcbuf, tainted[0].length); // expected-warning {{Untrusted data is used to specify the buffer size}} |
219 | |
220 | __builtin_memset(&tainted, 0, sizeof(tainted)); |
221 | read(sock, &tainted, sizeof(tainted)); |
222 | __builtin_memcpy(dstbuf, srcbuf, tainted[0].length); // expected-warning {{Untrusted data is used to specify the buffer size}} |
223 | |
224 | __builtin_memset(&tainted, 0, sizeof(tainted)); |
225 | // If we taint element 1, we should not raise an alert on taint for element 0 or element 2 |
226 | read(sock, &tainted[1], sizeof(tainted)); |
227 | __builtin_memcpy(dstbuf, srcbuf, tainted[0].length); // no-warning |
228 | __builtin_memcpy(dstbuf, srcbuf, tainted[2].length); // no-warning |
229 | } |
230 | |
231 | void testUnion() { |
232 | union { |
233 | int x; |
234 | char y[4]; |
235 | } tainted; |
236 | |
237 | char buffer[4]; |
238 | |
239 | int sock = socket(AF_INET, SOCK_STREAM, 0); |
240 | read(sock, &tainted.y, sizeof(tainted.y)); |
241 | tainted.x = 0; |
242 | // FIXME: overlapping regions aren't detected by isTainted yet |
243 | __builtin_memcpy(buffer, tainted.y, tainted.x); |
244 | } |
245 | |
246 | int testDivByZero() { |
247 | int x; |
248 | scanf("%d", &x); |
249 | return 5/x; // expected-warning {{Division by a tainted value, possibly zero}} |
250 | } |
251 | |
252 | // Zero-sized VLAs. |
253 | void testTaintedVLASize() { |
254 | int x; |
255 | scanf("%d", &x); |
256 | int vla[x]; // expected-warning{{Declared variable-length array (VLA) has tainted size}} |
257 | } |
258 | |
259 | // This computation used to take a very long time. |
260 | #define longcmp(a,b,c) { \ |
261 | a -= c; a ^= c; c += b; b -= a; b ^= (a<<6) | (a >> (32-b)); a += c; c -= b; c ^= b; b += a; \ |
262 | a -= c; a ^= c; c += b; b -= a; b ^= a; a += c; c -= b; c ^= b; b += a; } |
263 | |
264 | unsigned radar11369570_hanging(const unsigned char *arr, int l) { |
265 | unsigned a, b, c; |
266 | a = b = c = 0x9899e3 + l; |
267 | while (l >= 6) { |
268 | unsigned t; |
269 | scanf("%d", &t); |
270 | a += b; |
271 | a ^= a; |
272 | a += (arr[3] + ((unsigned) arr[2] << 8) + ((unsigned) arr[1] << 16) + ((unsigned) arr[0] << 24)); |
273 | longcmp(a, t, c); |
274 | l -= 12; |
275 | } |
276 | return 5/a; // expected-warning {{Division by a tainted value, possibly zero}} |
277 | } |
278 | |
279 | // Check that we do not assert of the following code. |
280 | int SymSymExprWithDiffTypes(void* p) { |
281 | int i; |
282 | scanf("%d", &i); |
283 | int j = (i % (int)(long)p); |
284 | return 5/j; // expected-warning {{Division by a tainted value, possibly zero}} |
285 | } |
286 | |
287 | |
288 | void constraintManagerShouldTreatAsOpaque(int rhs) { |
289 | int i; |
290 | scanf("%d", &i); |
291 | // This comparison used to hit an assertion in the constraint manager, |
292 | // which didn't handle NonLoc sym-sym comparisons. |
293 | if (i < rhs) |
294 | return; |
295 | if (i < rhs) |
296 | *(volatile int *) 0; // no-warning |
297 | } |
298 | |