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| // RUN: %clang_analyze_cc1 -Wno-int-to-pointer-cast -analyzer-checker=alpha.security.taint,debug.TaintTest %s -verify
#include "Inputs/system-header-simulator.h"
#define BUFSIZE 10
int Buffer[BUFSIZE];
struct XYStruct {
int x;
int y;
char z;
};
void taintTracking(int x) {
int n;
int *addr = &Buffer[0];
scanf("%d", &n);
addr += n;// expected-warning + {{tainted}}
*addr = n; // expected-warning + {{tainted}}
double tdiv = n / 30; // expected-warning+ {{tainted}}
char *loc_cast = (char *) n; // expected-warning +{{tainted}}
char tinc = tdiv++; // expected-warning + {{tainted}}
int tincdec = (char)tinc--; // expected-warning+{{tainted}}
// Tainted ptr arithmetic/array element address.
int tprtarithmetic1 = *(addr+1); // expected-warning + {{tainted}}
// Dereference.
int *ptr;
scanf("%p", &ptr);
int ptrDeref = *ptr; // expected-warning + {{tainted}}
int _ptrDeref = ptrDeref + 13; // expected-warning + {{tainted}}
// Pointer arithmetic + dereferencing.
// FIXME: We fail to propagate the taint here because RegionStore does not
// handle ElementRegions with symbolic indexes.
int addrDeref = *addr; // expected-warning + {{tainted}}
int _addrDeref = addrDeref; // expected-warning + {{tainted}}
// Tainted struct address, casts.
struct XYStruct *xyPtr = 0;
scanf("%p", &xyPtr);
void *tXYStructPtr = xyPtr; // expected-warning + {{tainted}}
struct XYStruct *xyPtrCopy = tXYStructPtr; // expected-warning + {{tainted}}
int ptrtx = xyPtr->x;// expected-warning + {{tainted}}
int ptrty = xyPtr->y;// expected-warning + {{tainted}}
// Taint on fields of a struct.
struct XYStruct xy = {2, 3, 11};
scanf("%d", &xy.y);
scanf("%d", &xy.x);
int tx = xy.x; // expected-warning + {{tainted}}
int ty = xy.y; // FIXME: This should be tainted as well.
char ntz = xy.z;// no warning
// Now, scanf scans both.
scanf("%d %d", &xy.y, &xy.x);
int ttx = xy.x; // expected-warning + {{tainted}}
int tty = xy.y; // expected-warning + {{tainted}}
}
void BitwiseOp(int in, char inn) {
// Taint on bitwise operations, integer to integer cast.
int m;
int x = 0;
scanf("%d", &x);
int y = (in << (x << in)) * 5;// expected-warning + {{tainted}}
// The next line tests integer to integer cast.
int z = y & inn; // expected-warning + {{tainted}}
if (y == 5) // expected-warning + {{tainted}}
m = z | z;// expected-warning + {{tainted}}
else
m = inn;
int mm = m; // expected-warning + {{tainted}}
}
// Test getenv.
char *getenv(const char *name);
void getenvTest(char *home) {
home = getenv("HOME"); // expected-warning + {{tainted}}
if (home != 0) { // expected-warning + {{tainted}}
char d = home[0]; // expected-warning + {{tainted}}
}
}
int fscanfTest(void) {
FILE *fp;
char s[80];
int t;
// Check if stdin is treated as tainted.
fscanf(stdin, "%s %d", s, &t);
// Note, here, s is not tainted, but the data s points to is tainted.
char *ts = s;
char tss = s[0]; // expected-warning + {{tainted}}
int tt = t; // expected-warning + {{tainted}}
if((fp=fopen("test", "w")) == 0) // expected-warning + {{tainted}}
return 1;
fprintf(fp, "%s %d", s, t); // expected-warning + {{tainted}}
fclose(fp); // expected-warning + {{tainted}}
// Test fscanf and fopen.
if((fp=fopen("test","r")) == 0) // expected-warning + {{tainted}}
return 1;
fscanf(fp, "%s%d", s, &t); // expected-warning + {{tainted}}
fprintf(stdout, "%s %d", s, t); // expected-warning + {{tainted}}
return 0;
}
// Check if we propagate taint from stdin when it's used in an assignment.
void stdinTest1() {
int i;
fscanf(stdin, "%d", &i);
int j = i; // expected-warning + {{tainted}}
}
void stdinTest2(FILE *pIn) {
FILE *p = stdin;
FILE *pp = p;
int ii;
fscanf(pp, "%d", &ii);
int jj = ii;// expected-warning + {{tainted}}
fscanf(p, "%d", &ii);
int jj2 = ii;// expected-warning + {{tainted}}
ii = 3;
int jj3 = ii;// no warning
p = pIn;
fscanf(p, "%d", &ii);
int jj4 = ii;// no warning
}
void stdinTest3() {
FILE **ppp = &stdin;
int iii;
fscanf(*ppp, "%d", &iii);
int jjj = iii;// expected-warning + {{tainted}}
}
// Test that stdin does not get invalidated by calls.
void foo();
void stdinTest4() {
int i;
fscanf(stdin, "%d", &i);
foo();
int j = i; // expected-warning + {{tainted}}
}
int getw(FILE *);
void getwTest() {
int i = getw(stdin); // expected-warning + {{tainted}}
}
typedef long ssize_t;
ssize_t getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
int printf(const char * __restrict, ...);
void free(void *ptr);
void getlineTest(void) {
FILE *fp;
char *line = 0;
size_t len = 0;
ssize_t read;
while ((read = getline(&line, &len, stdin)) != -1) {
printf("%s", line); // expected-warning + {{tainted}}
}
free(line); // expected-warning + {{tainted}}
}
// Test propagation functions - the ones that propagate taint from arguments to
// return value, ptr arguments.
int atoi(const char *nptr);
long atol(const char *nptr);
long long atoll(const char *nptr);
void atoiTest() {
char s[80];
scanf("%s", s);
int d = atoi(s); // expected-warning + {{tainted}}
int td = d; // expected-warning + {{tainted}}
long l = atol(s); // expected-warning + {{tainted}}
int tl = l; // expected-warning + {{tainted}}
long long ll = atoll(s); // expected-warning + {{tainted}}
int tll = ll; // expected-warning + {{tainted}}
}
char *pointer1;
void *pointer2;
void noCrashTest() {
if (!*pointer1) {
__builtin___memcpy_chk(pointer2, pointer1, 0, 0); // no-crash
}
}
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