| // RUN: %clang_analyze_cc1 -analyzer-checker=alpha.security.taint,core,alpha.security.ArrayBoundV2 -Wno-format-security -verify %s |
| |
| int scanf(const char *restrict format, ...); |
| int getchar(void); |
| |
| typedef struct _FILE FILE; |
| extern FILE *stdin; |
| int fscanf(FILE *restrict stream, const char *restrict format, ...); |
| int sprintf(char *str, const char *format, ...); |
| void setproctitle(const char *fmt, ...); |
| typedef __typeof(sizeof(int)) size_t; |
| |
| // Define string functions. Use builtin for some of them. They all default to |
| // the processing in the taint checker. |
| #define strcpy(dest, src) \ |
| ((__builtin_object_size(dest, 0) != -1ULL) \ |
| ? __builtin___strcpy_chk (dest, src, __builtin_object_size(dest, 1)) \ |
| : __inline_strcpy_chk(dest, src)) |
| |
| static char *__inline_strcpy_chk (char *dest, const char *src) { |
| return __builtin___strcpy_chk(dest, src, __builtin_object_size(dest, 1)); |
| } |
| char *stpcpy(char *restrict s1, const char *restrict s2); |
| char *strncpy( char * destination, const char * source, size_t num ); |
| char *strndup(const char *s, size_t n); |
| char *strncat(char *restrict s1, const char *restrict s2, size_t n); |
| |
| void *malloc(size_t); |
| void *calloc(size_t nmemb, size_t size); |
| void bcopy(void *s1, void *s2, size_t n); |
| |
| #define BUFSIZE 10 |
| |
| int Buffer[BUFSIZE]; |
| void bufferScanfDirect(void) |
| { |
| int n; |
| scanf("%d", &n); |
| Buffer[n] = 1; // expected-warning {{Out of bound memory access }} |
| } |
| |
| void bufferScanfArithmetic1(int x) { |
| int n; |
| scanf("%d", &n); |
| int m = (n - 3); |
| Buffer[m] = 1; // expected-warning {{Out of bound memory access }} |
| } |
| |
| void bufferScanfArithmetic2(int x) { |
| int n; |
| scanf("%d", &n); |
| int m = 100 - (n + 3) * x; |
| Buffer[m] = 1; // expected-warning {{Out of bound memory access }} |
| } |
| |
| void bufferScanfAssignment(int x) { |
| int n; |
| scanf("%d", &n); |
| int m; |
| if (x > 0) { |
| m = n; |
| Buffer[m] = 1; // expected-warning {{Out of bound memory access }} |
| } |
| } |
| |
| void scanfArg() { |
| int t = 0; |
| scanf("%d", t); // expected-warning {{format specifies type 'int *' but the argument has type 'int'}} |
| } |
| |
| void bufferGetchar(int x) { |
| int m = getchar(); |
| Buffer[m] = 1; //expected-warning {{Out of bound memory access (index is tainted)}} |
| } |
| |
| void testUncontrolledFormatString(char **p) { |
| char s[80]; |
| fscanf(stdin, "%s", s); |
| char buf[128]; |
| sprintf(buf,s); // expected-warning {{Uncontrolled Format String}} |
| setproctitle(s, 3); // expected-warning {{Uncontrolled Format String}} |
| |
| // Test taint propagation through strcpy and family. |
| char scpy[80]; |
| strcpy(scpy, s); |
| sprintf(buf,scpy); // expected-warning {{Uncontrolled Format String}} |
| |
| stpcpy(*(++p), s); // this generates __inline. |
| setproctitle(*(p), 3); // expected-warning {{Uncontrolled Format String}} |
| |
| char spcpy[80]; |
| stpcpy(spcpy, s); |
| setproctitle(spcpy, 3); // expected-warning {{Uncontrolled Format String}} |
| |
| char *spcpyret; |
| spcpyret = stpcpy(spcpy, s); |
| setproctitle(spcpyret, 3); // expected-warning {{Uncontrolled Format String}} |
| |
| char sncpy[80]; |
| strncpy(sncpy, s, 20); |
| setproctitle(sncpy, 3); // expected-warning {{Uncontrolled Format String}} |
| |
| char *dup; |
| dup = strndup(s, 20); |
| setproctitle(dup, 3); // expected-warning {{Uncontrolled Format String}} |
| |
| } |
| |
| int system(const char *command); |
| void testTaintSystemCall() { |
| char buffer[156]; |
| char addr[128]; |
| scanf("%s", addr); |
| system(addr); // expected-warning {{Untrusted data is passed to a system call}} |
| |
| // Test that spintf transfers taint. |
| sprintf(buffer, "/bin/mail %s < /tmp/email", addr); |
| system(buffer); // expected-warning {{Untrusted data is passed to a system call}} |
| } |
| |
| void testTaintSystemCall2() { |
| // Test that snpintf transfers taint. |
| char buffern[156]; |
| char addr[128]; |
| scanf("%s", addr); |
| __builtin_snprintf(buffern, 10, "/bin/mail %s < /tmp/email", addr); |
| system(buffern); // expected-warning {{Untrusted data is passed to a system call}} |
| } |
| |
| void testTaintSystemCall3() { |
| char buffern2[156]; |
| int numt; |
| char addr[128]; |
| scanf("%s %d", addr, &numt); |
| __builtin_snprintf(buffern2, numt, "/bin/mail %s < /tmp/email", "abcd"); |
| system(buffern2); // expected-warning {{Untrusted data is passed to a system call}} |
| } |
| |
| void testTaintedBufferSize() { |
| size_t ts; |
| scanf("%zd", &ts); |
| |
| int *buf1 = (int*)malloc(ts*sizeof(int)); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| char *dst = (char*)calloc(ts, sizeof(char)); //expected-warning {{Untrusted data is used to specify the buffer size}} |
| bcopy(buf1, dst, ts); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| __builtin_memcpy(dst, buf1, (ts + 4)*sizeof(char)); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| |
| // If both buffers are trusted, do not issue a warning. |
| char *dst2 = (char*)malloc(ts*sizeof(char)); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| strncat(dst2, dst, ts); // no-warning |
| } |
| |
| #define AF_UNIX 1 /* local to host (pipes) */ |
| #define AF_INET 2 /* internetwork: UDP, TCP, etc. */ |
| #define AF_LOCAL AF_UNIX /* backward compatibility */ |
| #define SOCK_STREAM 1 |
| int socket(int, int, int); |
| size_t read(int, void *, size_t); |
| int execl(const char *, const char *, ...); |
| |
| void testSocket() { |
| int sock; |
| char buffer[100]; |
| |
| sock = socket(AF_INET, SOCK_STREAM, 0); |
| read(sock, buffer, 100); |
| execl(buffer, "filename", 0); // expected-warning {{Untrusted data is passed to a system call}} |
| |
| sock = socket(AF_LOCAL, SOCK_STREAM, 0); |
| read(sock, buffer, 100); |
| execl(buffer, "filename", 0); // no-warning |
| |
| sock = socket(AF_INET, SOCK_STREAM, 0); |
| // References to both buffer and &buffer as an argument should taint the argument |
| read(sock, &buffer, 100); |
| execl(buffer, "filename", 0); // expected-warning {{Untrusted data is passed to a system call}} |
| } |
| |
| void testStruct() { |
| struct { |
| char buf[16]; |
| int length; |
| } tainted; |
| |
| char buffer[16]; |
| int sock; |
| |
| sock = socket(AF_INET, SOCK_STREAM, 0); |
| read(sock, &tainted, sizeof(tainted)); |
| __builtin_memcpy(buffer, tainted.buf, tainted.length); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| } |
| |
| void testStructArray() { |
| struct { |
| int length; |
| } tainted[4]; |
| |
| char dstbuf[16], srcbuf[16]; |
| int sock; |
| |
| sock = socket(AF_INET, SOCK_STREAM, 0); |
| __builtin_memset(srcbuf, 0, sizeof(srcbuf)); |
| |
| read(sock, &tainted[0], sizeof(tainted)); |
| __builtin_memcpy(dstbuf, srcbuf, tainted[0].length); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| |
| __builtin_memset(&tainted, 0, sizeof(tainted)); |
| read(sock, &tainted, sizeof(tainted)); |
| __builtin_memcpy(dstbuf, srcbuf, tainted[0].length); // expected-warning {{Untrusted data is used to specify the buffer size}} |
| |
| __builtin_memset(&tainted, 0, sizeof(tainted)); |
| // If we taint element 1, we should not raise an alert on taint for element 0 or element 2 |
| read(sock, &tainted[1], sizeof(tainted)); |
| __builtin_memcpy(dstbuf, srcbuf, tainted[0].length); // no-warning |
| __builtin_memcpy(dstbuf, srcbuf, tainted[2].length); // no-warning |
| } |
| |
| void testUnion() { |
| union { |
| int x; |
| char y[4]; |
| } tainted; |
| |
| char buffer[4]; |
| |
| int sock = socket(AF_INET, SOCK_STREAM, 0); |
| read(sock, &tainted.y, sizeof(tainted.y)); |
| // FIXME: overlapping regions aren't detected by isTainted yet |
| __builtin_memcpy(buffer, tainted.y, tainted.x); |
| } |
| |
| int testDivByZero() { |
| int x; |
| scanf("%d", &x); |
| return 5/x; // expected-warning {{Division by a tainted value, possibly zero}} |
| } |
| |
| // Zero-sized VLAs. |
| void testTaintedVLASize() { |
| int x; |
| scanf("%d", &x); |
| int vla[x]; // expected-warning{{Declared variable-length array (VLA) has tainted size}} |
| } |
| |
| // This computation used to take a very long time. |
| #define longcmp(a,b,c) { \ |
| a -= c; a ^= c; c += b; b -= a; b ^= (a<<6) | (a >> (32-b)); a += c; c -= b; c ^= b; b += a; \ |
| a -= c; a ^= c; c += b; b -= a; b ^= a; a += c; c -= b; c ^= b; b += a; } |
| |
| unsigned radar11369570_hanging(const unsigned char *arr, int l) { |
| unsigned a, b, c; |
| a = b = c = 0x9899e3 + l; |
| while (l >= 6) { |
| unsigned t; |
| scanf("%d", &t); |
| a += b; |
| a ^= a; |
| a += (arr[3] + ((unsigned) arr[2] << 8) + ((unsigned) arr[1] << 16) + ((unsigned) arr[0] << 24)); |
| longcmp(a, t, c); |
| l -= 12; |
| } |
| return 5/a; // expected-warning {{Division by a tainted value, possibly zero}} |
| } |
| |
| // Check that we do not assert of the following code. |
| int SymSymExprWithDiffTypes(void* p) { |
| int i; |
| scanf("%d", &i); |
| int j = (i % (int)(long)p); |
| return 5/j; // expected-warning {{Division by a tainted value, possibly zero}} |
| } |
| |
| |
| void constraintManagerShouldTreatAsOpaque(int rhs) { |
| int i; |
| scanf("%d", &i); |
| // This comparison used to hit an assertion in the constraint manager, |
| // which didn't handle NonLoc sym-sym comparisons. |
| if (i < rhs) |
| return; |
| if (i < rhs) |
| *(volatile int *) 0; // no-warning |
| } |