sanchayanmaity/minix
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
minix/external/bsd/llvm/dist/clang/test/Analysis/string.c

1109 lines
32 KiB
C
Raw Normal View History

Importing netbsd clang -- pristine Change-Id: Ia40e9ffdf29b5dab2f122f673ff6802a58bc690f
2013-11-15 13:00:54 +01:00
// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s
// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s
// RUN: %clang_cc1 -analyze -DVARIANT -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s
// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -analyzer-checker=alpha.security.taint,core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s
//===----------------------------------------------------------------------===
// Declarations
//===----------------------------------------------------------------------===
// Some functions are so similar to each other that they follow the same code
// path, such as memcpy and __memcpy_chk, or memcmp and bcmp. If VARIANT is
// defined, make sure to use the variants instead to make sure they are still
// checked by the analyzer.
// Some functions are implemented as builtins. These should be #defined as
// BUILTIN(f), which will prepend "__builtin_" if USE_BUILTINS is defined.
// Functions that have variants and are also available as builtins should be
// declared carefully! See memcpy() for an example.
#ifdef USE_BUILTINS
# define BUILTIN(f) __builtin_ ## f
#else /* USE_BUILTINS */
# define BUILTIN(f) f
#endif /* USE_BUILTINS */
#define NULL 0
typedef typeof(sizeof(int)) size_t;
void clang_analyzer_eval(int);
int scanf(const char *restrict format, ...);
//===----------------------------------------------------------------------===
// strlen()
//===----------------------------------------------------------------------===
#define strlen BUILTIN(strlen)
size_t strlen(const char *s);
void strlen_constant0() {
clang_analyzer_eval(strlen("123") == 3); // expected-warning{{TRUE}}
}
void strlen_constant1() {
const char *a = "123";
clang_analyzer_eval(strlen(a) == 3); // expected-warning{{TRUE}}
}
void strlen_constant2(char x) {
char a[] = "123";
clang_analyzer_eval(strlen(a) == 3); // expected-warning{{TRUE}}
a[0] = x;
clang_analyzer_eval(strlen(a) == 3); // expected-warning{{UNKNOWN}}
}
size_t strlen_null() {
return strlen(0); // expected-warning{{Null pointer argument in call to string length function}}
}
size_t strlen_fn() {
return strlen((char*)&strlen_fn); // expected-warning{{Argument to string length function is the address of the function 'strlen_fn', which is not a null-terminated string}}
}
size_t strlen_nonloc() {
label:
return strlen((char*)&&label); // expected-warning{{Argument to string length function is the address of the label 'label', which is not a null-terminated string}}
}
void strlen_subregion() {
struct two_strings { char a[2], b[2]; };
extern void use_two_strings(struct two_strings *);
struct two_strings z;
use_two_strings(&z);
size_t a = strlen(z.a);
z.b[0] = 5;
size_t b = strlen(z.a);
if (a == 0)
clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
use_two_strings(&z);
size_t c = strlen(z.a);
if (a == 0)
clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
}
extern void use_string(char *);
void strlen_argument(char *x) {
size_t a = strlen(x);
size_t b = strlen(x);
if (a == 0)
clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
use_string(x);
size_t c = strlen(x);
if (a == 0)
clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
}
extern char global_str[];
void strlen_global() {
size_t a = strlen(global_str);
size_t b = strlen(global_str);
if (a == 0) {
clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
// Make sure clang_analyzer_eval does not invalidate globals.
clang_analyzer_eval(strlen(global_str) == 0); // expected-warning{{TRUE}}
}
// Call a function with unknown effects, which should invalidate globals.
use_string(0);
size_t c = strlen(global_str);
if (a == 0)
clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
}
void strlen_indirect(char *x) {
size_t a = strlen(x);
char *p = x;
char **p2 = &p;
size_t b = strlen(x);
if (a == 0)
clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
extern void use_string_ptr(char*const*);
use_string_ptr(p2);
size_t c = strlen(x);
if (a == 0)
clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
}
void strlen_indirect2(char *x) {
size_t a = strlen(x);
char *p = x;
char **p2 = &p;
extern void use_string_ptr2(char**);
use_string_ptr2(p2);
size_t c = strlen(x);
if (a == 0)
clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
}
void strlen_liveness(const char *x) {
if (strlen(x) < 5)
return;
clang_analyzer_eval(strlen(x) < 5); // expected-warning{{FALSE}}
}
//===----------------------------------------------------------------------===
// strnlen()
//===----------------------------------------------------------------------===
size_t strnlen(const char *s, size_t maxlen);
void strnlen_constant0() {
clang_analyzer_eval(strnlen("123", 10) == 3); // expected-warning{{TRUE}}
}
void strnlen_constant1() {
const char *a = "123";
clang_analyzer_eval(strnlen(a, 10) == 3); // expected-warning{{TRUE}}
}
void strnlen_constant2(char x) {
char a[] = "123";
clang_analyzer_eval(strnlen(a, 10) == 3); // expected-warning{{TRUE}}
a[0] = x;
clang_analyzer_eval(strnlen(a, 10) == 3); // expected-warning{{UNKNOWN}}
}
void strnlen_constant4() {
clang_analyzer_eval(strnlen("123456", 3) == 3); // expected-warning{{TRUE}}
}
void strnlen_constant5() {
const char *a = "123456";
clang_analyzer_eval(strnlen(a, 3) == 3); // expected-warning{{TRUE}}
}
void strnlen_constant6(char x) {
char a[] = "123456";
clang_analyzer_eval(strnlen(a, 3) == 3); // expected-warning{{TRUE}}
a[0] = x;
clang_analyzer_eval(strnlen(a, 3) == 3); // expected-warning{{UNKNOWN}}
}
size_t strnlen_null() {
return strnlen(0, 3); // expected-warning{{Null pointer argument in call to string length function}}
}
size_t strnlen_fn() {
return strnlen((char*)&strlen_fn, 3); // expected-warning{{Argument to string length function is the address of the function 'strlen_fn', which is not a null-terminated string}}
}
size_t strnlen_nonloc() {
label:
return strnlen((char*)&&label, 3); // expected-warning{{Argument to string length function is the address of the label 'label', which is not a null-terminated string}}
}
void strnlen_zero() {
clang_analyzer_eval(strnlen("abc", 0) == 0); // expected-warning{{TRUE}}
clang_analyzer_eval(strnlen(NULL, 0) == 0); // expected-warning{{TRUE}}
}
size_t strnlen_compound_literal() {
// This used to crash because we don't model the string lengths of
// compound literals.
return strnlen((char[]) { 'a', 'b', 0 }, 1);
}
size_t strnlen_unknown_limit(float f) {
// This used to crash because we don't model the integer values of floats.
return strnlen("abc", (int)f);
}
void strnlen_is_not_strlen(char *x) {
clang_analyzer_eval(strnlen(x, 10) == strlen(x)); // expected-warning{{UNKNOWN}}
}
void strnlen_at_limit(char *x) {
size_t len = strnlen(x, 10);
clang_analyzer_eval(len <= 10); // expected-warning{{TRUE}}
clang_analyzer_eval(len == 10); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(len < 10); // expected-warning{{UNKNOWN}}
}
void strnlen_at_actual(size_t limit) {
size_t len = strnlen("abc", limit);
clang_analyzer_eval(len <= 3); // expected-warning{{TRUE}}
// This is due to eager assertion in strnlen.
if (limit == 0) {
clang_analyzer_eval(len == 0); // expected-warning{{TRUE}}
} else {
clang_analyzer_eval(len == 3); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(len < 3); // expected-warning{{UNKNOWN}}
}
}
//===----------------------------------------------------------------------===
// strcpy()
//===----------------------------------------------------------------------===
#ifdef VARIANT
#define __strcpy_chk BUILTIN(__strcpy_chk)
char *__strcpy_chk(char *restrict s1, const char *restrict s2, size_t destlen);
#define strcpy(a,b) __strcpy_chk(a,b,(size_t)-1)
#else /* VARIANT */
#define strcpy BUILTIN(strcpy)
char *strcpy(char *restrict s1, const char *restrict s2);
#endif /* VARIANT */
void strcpy_null_dst(char *x) {
strcpy(NULL, x); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strcpy_null_src(char *x) {
strcpy(x, NULL); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strcpy_fn(char *x) {
strcpy(x, (char*)&strcpy_fn); // expected-warning{{Argument to string copy function is the address of the function 'strcpy_fn', which is not a null-terminated string}}
}
void strcpy_fn_const(char *x) {
strcpy(x, (const char*)&strcpy_fn); // expected-warning{{Argument to string copy function is the address of the function 'strcpy_fn', which is not a null-terminated string}}
}
extern int globalInt;
void strcpy_effects(char *x, char *y) {
char a = x[0];
if (globalInt != 42)
return;
clang_analyzer_eval(strcpy(x, y) == x); // expected-warning{{TRUE}}
clang_analyzer_eval(strlen(x) == strlen(y)); // expected-warning{{TRUE}}
clang_analyzer_eval(a == x[0]); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(globalInt == 42); // expected-warning{{TRUE}}
}
void strcpy_overflow(char *y) {
char x[4];
if (strlen(y) == 4)
strcpy(x, y); // expected-warning{{String copy function overflows destination buffer}}
}
void strcpy_no_overflow(char *y) {
char x[4];
if (strlen(y) == 3)
strcpy(x, y); // no-warning
}
//===----------------------------------------------------------------------===
// stpcpy()
//===----------------------------------------------------------------------===
#ifdef VARIANT
#define __stpcpy_chk BUILTIN(__stpcpy_chk)
char *__stpcpy_chk(char *restrict s1, const char *restrict s2, size_t destlen);
#define stpcpy(a,b) __stpcpy_chk(a,b,(size_t)-1)
#else /* VARIANT */
#define stpcpy BUILTIN(stpcpy)
char *stpcpy(char *restrict s1, const char *restrict s2);
#endif /* VARIANT */
void stpcpy_effect(char *x, char *y) {
char a = x[0];
clang_analyzer_eval(stpcpy(x, y) == &x[strlen(y)]); // expected-warning{{TRUE}}
clang_analyzer_eval(strlen(x) == strlen(y)); // expected-warning{{TRUE}}
clang_analyzer_eval(a == x[0]); // expected-warning{{UNKNOWN}}
}
void stpcpy_overflow(char *y) {
char x[4];
if (strlen(y) == 4)
stpcpy(x, y); // expected-warning{{String copy function overflows destination buffer}}
}
void stpcpy_no_overflow(char *y) {
char x[4];
if (strlen(y) == 3)
stpcpy(x, y); // no-warning
}
//===----------------------------------------------------------------------===
// strcat()
//===----------------------------------------------------------------------===
#ifdef VARIANT
#define __strcat_chk BUILTIN(__strcat_chk)
char *__strcat_chk(char *restrict s1, const char *restrict s2, size_t destlen);
#define strcat(a,b) __strcat_chk(a,b,(size_t)-1)
#else /* VARIANT */
#define strcat BUILTIN(strcat)
char *strcat(char *restrict s1, const char *restrict s2);
#endif /* VARIANT */
void strcat_null_dst(char *x) {
strcat(NULL, x); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strcat_null_src(char *x) {
strcat(x, NULL); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strcat_fn(char *x) {
strcat(x, (char*)&strcat_fn); // expected-warning{{Argument to string copy function is the address of the function 'strcat_fn', which is not a null-terminated string}}
}
void strcat_effects(char *y) {
char x[8] = "123";
size_t orig_len = strlen(x);
char a = x[0];
if (strlen(y) != 4)
return;
clang_analyzer_eval(strcat(x, y) == x); // expected-warning{{TRUE}}
clang_analyzer_eval((int)strlen(x) == (orig_len + strlen(y))); // expected-warning{{TRUE}}
}
void strcat_overflow_0(char *y) {
char x[4] = "12";
if (strlen(y) == 4)
strcat(x, y); // expected-warning{{String copy function overflows destination buffer}}
}
void strcat_overflow_1(char *y) {
char x[4] = "12";
if (strlen(y) == 3)
strcat(x, y); // expected-warning{{String copy function overflows destination buffer}}
}
void strcat_overflow_2(char *y) {
char x[4] = "12";
if (strlen(y) == 2)
strcat(x, y); // expected-warning{{String copy function overflows destination buffer}}
}
void strcat_no_overflow(char *y) {
char x[5] = "12";
if (strlen(y) == 2)
strcat(x, y); // no-warning
}
void strcat_symbolic_dst_length(char *dst) {
strcat(dst, "1234");
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
}
void strcat_symbolic_dst_length_taint(char *dst) {
scanf("%s", dst); // Taint data.
strcat(dst, "1234");
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
}
void strcat_unknown_src_length(char *src, int offset) {
char dst[8] = "1234";
strcat(dst, &src[offset]);
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
}
// There is no strcat_unknown_dst_length because if we can't get a symbolic
// length for the "before" strlen, we won't be able to set one for "after".
void strcat_too_big(char *dst, char *src) {
// We assume this can never actually happen, so we don't get a warning.
if (strlen(dst) != (((size_t)0) - 2))
return;
if (strlen(src) != 2)
return;
strcat(dst, src);
}
//===----------------------------------------------------------------------===
// strncpy()
//===----------------------------------------------------------------------===
#ifdef VARIANT
#define __strncpy_chk BUILTIN(__strncpy_chk)
char *__strncpy_chk(char *restrict s1, const char *restrict s2, size_t n, size_t destlen);
#define strncpy(a,b,n) __strncpy_chk(a,b,n,(size_t)-1)
#else /* VARIANT */
#define strncpy BUILTIN(strncpy)
char *strncpy(char *restrict s1, const char *restrict s2, size_t n);
#endif /* VARIANT */
void strncpy_null_dst(char *x) {
strncpy(NULL, x, 5); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strncpy_null_src(char *x) {
strncpy(x, NULL, 5); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strncpy_fn(char *x) {
strncpy(x, (char*)&strcpy_fn, 5); // expected-warning{{Argument to string copy function is the address of the function 'strcpy_fn', which is not a null-terminated string}}
}
void strncpy_effects(char *x, char *y) {
char a = x[0];
clang_analyzer_eval(strncpy(x, y, 5) == x); // expected-warning{{TRUE}}
clang_analyzer_eval(strlen(x) == strlen(y)); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(a == x[0]); // expected-warning{{UNKNOWN}}
}
void strncpy_overflow(char *y) {
char x[4];
if (strlen(y) == 4)
strncpy(x, y, 5); // expected-warning{{Size argument is greater than the length of the destination buffer}}
}
void strncpy_no_overflow(char *y) {
char x[4];
if (strlen(y) == 3)
strncpy(x, y, 5); // expected-warning{{Size argument is greater than the length of the destination buffer}}
}
void strncpy_no_overflow2(char *y, int n) {
if (n <= 4)
return;
char x[4];
if (strlen(y) == 3)
strncpy(x, y, n); // expected-warning{{Size argument is greater than the length of the destination buffer}}
}
void strncpy_truncate(char *y) {
char x[4];
if (strlen(y) == 4)
strncpy(x, y, 3); // no-warning
}
void strncpy_no_truncate(char *y) {
char x[4];
if (strlen(y) == 3)
strncpy(x, y, 3); // no-warning
}
void strncpy_exactly_matching_buffer(char *y) {
char x[4];
strncpy(x, y, 4); // no-warning
// strncpy does not null-terminate, so we have no idea what the strlen is
// after this.
clang_analyzer_eval(strlen(x) > 4); // expected-warning{{UNKNOWN}}
}
void strncpy_zero(char *src) {
char dst[] = "123";
strncpy(dst, src, 0); // no-warning
}
void strncpy_empty() {
char dst[] = "123";
char src[] = "";
strncpy(dst, src, 4); // no-warning
}
//===----------------------------------------------------------------------===
// strncat()
//===----------------------------------------------------------------------===
#ifdef VARIANT
#define __strncat_chk BUILTIN(__strncat_chk)
char *__strncat_chk(char *restrict s1, const char *restrict s2, size_t n, size_t destlen);
#define strncat(a,b,c) __strncat_chk(a,b,c, (size_t)-1)
#else /* VARIANT */
#define strncat BUILTIN(strncat)
char *strncat(char *restrict s1, const char *restrict s2, size_t n);
#endif /* VARIANT */
void strncat_null_dst(char *x) {
strncat(NULL, x, 4); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strncat_null_src(char *x) {
strncat(x, NULL, 4); // expected-warning{{Null pointer argument in call to string copy function}}
}
void strncat_fn(char *x) {
strncat(x, (char*)&strncat_fn, 4); // expected-warning{{Argument to string copy function is the address of the function 'strncat_fn', which is not a null-terminated string}}
}
void strncat_effects(char *y) {
char x[8] = "123";
size_t orig_len = strlen(x);
char a = x[0];
if (strlen(y) != 4)
return;
clang_analyzer_eval(strncat(x, y, strlen(y)) == x); // expected-warning{{TRUE}}
clang_analyzer_eval(strlen(x) == (orig_len + strlen(y))); // expected-warning{{TRUE}}
}
void strncat_overflow_0(char *y) {
char x[4] = "12";
if (strlen(y) == 4)
strncat(x, y, strlen(y)); // expected-warning{{Size argument is greater than the free space in the destination buffer}}
}
void strncat_overflow_1(char *y) {
char x[4] = "12";
if (strlen(y) == 3)
strncat(x, y, strlen(y)); // expected-warning{{Size argument is greater than the free space in the destination buffer}}
}
void strncat_overflow_2(char *y) {
char x[4] = "12";
if (strlen(y) == 2)
strncat(x, y, strlen(y)); // expected-warning{{Size argument is greater than the free space in the destination buffer}}
}
void strncat_overflow_3(char *y) {
char x[4] = "12";
if (strlen(y) == 4)
strncat(x, y, 2); // expected-warning{{Size argument is greater than the free space in the destination buffer}}
}
void strncat_no_overflow_1(char *y) {
char x[5] = "12";
if (strlen(y) == 2)
strncat(x, y, strlen(y)); // no-warning
}
void strncat_no_overflow_2(char *y) {
char x[4] = "12";
if (strlen(y) == 4)
strncat(x, y, 1); // no-warning
}
void strncat_symbolic_dst_length(char *dst) {
strncat(dst, "1234", 5);
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
}
void strncat_symbolic_src_length(char *src) {
char dst[8] = "1234";
strncat(dst, src, 3);
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
char dst2[8] = "1234";
strncat(dst2, src, 4); // expected-warning{{Size argument is greater than the free space in the destination buffer}}
}
void strncat_unknown_src_length(char *src, int offset) {
char dst[8] = "1234";
strncat(dst, &src[offset], 3);
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
char dst2[8] = "1234";
strncat(dst2, &src[offset], 4); // expected-warning{{Size argument is greater than the free space in the destination buffer}}
}
// There is no strncat_unknown_dst_length because if we can't get a symbolic
// length for the "before" strlen, we won't be able to set one for "after".
void strncat_symbolic_limit(unsigned limit) {
char dst[6] = "1234";
char src[] = "567";
strncat(dst, src, limit); // no-warning
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
clang_analyzer_eval(strlen(dst) == 4); // expected-warning{{UNKNOWN}}
}
void strncat_unknown_limit(float limit) {
char dst[6] = "1234";
char src[] = "567";
strncat(dst, src, (size_t)limit); // no-warning
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}}
clang_analyzer_eval(strlen(dst) == 4); // expected-warning{{UNKNOWN}}
}
void strncat_too_big(char *dst, char *src) {
// We assume this will never actually happen, so we don't get a warning.
if (strlen(dst) != (((size_t)0) - 2))
return;
if (strlen(src) != 2)
return;
strncat(dst, src, 2);
}
void strncat_zero(char *src) {
char dst[] = "123";
strncat(dst, src, 0); // no-warning
}
void strncat_empty() {
char dst[8] = "123";
char src[] = "";
strncat(dst, src, 4); // no-warning
}
//===----------------------------------------------------------------------===
// strcmp()
//===----------------------------------------------------------------------===
#define strcmp BUILTIN(strcmp)
int strcmp(const char * s1, const char * s2);
void strcmp_constant0() {
clang_analyzer_eval(strcmp("123", "123") == 0); // expected-warning{{TRUE}}
}
void strcmp_constant_and_var_0() {
char *x = "123";
clang_analyzer_eval(strcmp(x, "123") == 0); // expected-warning{{TRUE}}
}
void strcmp_constant_and_var_1() {
char *x = "123";
clang_analyzer_eval(strcmp("123", x) == 0); // expected-warning{{TRUE}}
}
void strcmp_0() {
char *x = "123";
char *y = "123";
clang_analyzer_eval(strcmp(x, y) == 0); // expected-warning{{TRUE}}
}
void strcmp_1() {
char *x = "234";
char *y = "123";
clang_analyzer_eval(strcmp(x, y) == 1); // expected-warning{{TRUE}}
}
void strcmp_2() {
char *x = "123";
char *y = "234";
clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcmp_null_0() {
char *x = NULL;
char *y = "123";
strcmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strcmp_null_1() {
char *x = "123";
char *y = NULL;
strcmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strcmp_diff_length_0() {
char *x = "12345";
char *y = "234";
clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcmp_diff_length_1() {
char *x = "123";
char *y = "23456";
clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcmp_diff_length_2() {
char *x = "12345";
char *y = "123";
clang_analyzer_eval(strcmp(x, y) == 1); // expected-warning{{TRUE}}
}
void strcmp_diff_length_3() {
char *x = "123";
char *y = "12345";
clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcmp_embedded_null () {
clang_analyzer_eval(strcmp("\0z", "\0y") == 0); // expected-warning{{TRUE}}
}
void strcmp_unknown_arg (char *unknown) {
clang_analyzer_eval(strcmp(unknown, unknown) == 0); // expected-warning{{TRUE}}
}
//===----------------------------------------------------------------------===
// strncmp()
//===----------------------------------------------------------------------===
#define strncmp BUILTIN(strncmp)
int strncmp(const char *s1, const char *s2, size_t n);
void strncmp_constant0() {
clang_analyzer_eval(strncmp("123", "123", 3) == 0); // expected-warning{{TRUE}}
}
void strncmp_constant_and_var_0() {
char *x = "123";
clang_analyzer_eval(strncmp(x, "123", 3) == 0); // expected-warning{{TRUE}}
}
void strncmp_constant_and_var_1() {
char *x = "123";
clang_analyzer_eval(strncmp("123", x, 3) == 0); // expected-warning{{TRUE}}
}
void strncmp_0() {
char *x = "123";
char *y = "123";
clang_analyzer_eval(strncmp(x, y, 3) == 0); // expected-warning{{TRUE}}
}
void strncmp_1() {
char *x = "234";
char *y = "123";
clang_analyzer_eval(strncmp(x, y, 3) == 1); // expected-warning{{TRUE}}
}
void strncmp_2() {
char *x = "123";
char *y = "234";
clang_analyzer_eval(strncmp(x, y, 3) == -1); // expected-warning{{TRUE}}
}
void strncmp_null_0() {
char *x = NULL;
char *y = "123";
strncmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strncmp_null_1() {
char *x = "123";
char *y = NULL;
strncmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strncmp_diff_length_0() {
char *x = "12345";
char *y = "234";
clang_analyzer_eval(strncmp(x, y, 5) == -1); // expected-warning{{TRUE}}
}
void strncmp_diff_length_1() {
char *x = "123";
char *y = "23456";
clang_analyzer_eval(strncmp(x, y, 5) == -1); // expected-warning{{TRUE}}
}
void strncmp_diff_length_2() {
char *x = "12345";
char *y = "123";
clang_analyzer_eval(strncmp(x, y, 5) == 1); // expected-warning{{TRUE}}
}
void strncmp_diff_length_3() {
char *x = "123";
char *y = "12345";
clang_analyzer_eval(strncmp(x, y, 5) == -1); // expected-warning{{TRUE}}
}
void strncmp_diff_length_4() {
char *x = "123";
char *y = "12345";
clang_analyzer_eval(strncmp(x, y, 3) == 0); // expected-warning{{TRUE}}
}
void strncmp_diff_length_5() {
char *x = "012";
char *y = "12345";
clang_analyzer_eval(strncmp(x, y, 3) == -1); // expected-warning{{TRUE}}
}
void strncmp_diff_length_6() {
char *x = "234";
char *y = "12345";
clang_analyzer_eval(strncmp(x, y, 3) == 1); // expected-warning{{TRUE}}
}
void strncmp_embedded_null () {
clang_analyzer_eval(strncmp("ab\0zz", "ab\0yy", 4) == 0); // expected-warning{{TRUE}}
}
//===----------------------------------------------------------------------===
// strcasecmp()
//===----------------------------------------------------------------------===
#define strcasecmp BUILTIN(strcasecmp)
int strcasecmp(const char *s1, const char *s2);
void strcasecmp_constant0() {
clang_analyzer_eval(strcasecmp("abc", "Abc") == 0); // expected-warning{{TRUE}}
}
void strcasecmp_constant_and_var_0() {
char *x = "abc";
clang_analyzer_eval(strcasecmp(x, "Abc") == 0); // expected-warning{{TRUE}}
}
void strcasecmp_constant_and_var_1() {
char *x = "abc";
clang_analyzer_eval(strcasecmp("Abc", x) == 0); // expected-warning{{TRUE}}
}
void strcasecmp_0() {
char *x = "abc";
char *y = "Abc";
clang_analyzer_eval(strcasecmp(x, y) == 0); // expected-warning{{TRUE}}
}
void strcasecmp_1() {
char *x = "Bcd";
char *y = "abc";
clang_analyzer_eval(strcasecmp(x, y) == 1); // expected-warning{{TRUE}}
}
void strcasecmp_2() {
char *x = "abc";
char *y = "Bcd";
clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcasecmp_null_0() {
char *x = NULL;
char *y = "123";
strcasecmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strcasecmp_null_1() {
char *x = "123";
char *y = NULL;
strcasecmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strcasecmp_diff_length_0() {
char *x = "abcde";
char *y = "aBd";
clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcasecmp_diff_length_1() {
char *x = "abc";
char *y = "aBdef";
clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcasecmp_diff_length_2() {
char *x = "aBcDe";
char *y = "abc";
clang_analyzer_eval(strcasecmp(x, y) == 1); // expected-warning{{TRUE}}
}
void strcasecmp_diff_length_3() {
char *x = "aBc";
char *y = "abcde";
clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}}
}
void strcasecmp_embedded_null () {
clang_analyzer_eval(strcasecmp("ab\0zz", "ab\0yy") == 0); // expected-warning{{TRUE}}
}
//===----------------------------------------------------------------------===
// strncasecmp()
//===----------------------------------------------------------------------===
#define strncasecmp BUILTIN(strncasecmp)
int strncasecmp(const char *s1, const char *s2, size_t n);
void strncasecmp_constant0() {
clang_analyzer_eval(strncasecmp("abc", "Abc", 3) == 0); // expected-warning{{TRUE}}
}
void strncasecmp_constant_and_var_0() {
char *x = "abc";
clang_analyzer_eval(strncasecmp(x, "Abc", 3) == 0); // expected-warning{{TRUE}}
}
void strncasecmp_constant_and_var_1() {
char *x = "abc";
clang_analyzer_eval(strncasecmp("Abc", x, 3) == 0); // expected-warning{{TRUE}}
}
void strncasecmp_0() {
char *x = "abc";
char *y = "Abc";
clang_analyzer_eval(strncasecmp(x, y, 3) == 0); // expected-warning{{TRUE}}
}
void strncasecmp_1() {
char *x = "Bcd";
char *y = "abc";
clang_analyzer_eval(strncasecmp(x, y, 3) == 1); // expected-warning{{TRUE}}
}
void strncasecmp_2() {
char *x = "abc";
char *y = "Bcd";
clang_analyzer_eval(strncasecmp(x, y, 3) == -1); // expected-warning{{TRUE}}
}
void strncasecmp_null_0() {
char *x = NULL;
char *y = "123";
strncasecmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strncasecmp_null_1() {
char *x = "123";
char *y = NULL;
strncasecmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}}
}
void strncasecmp_diff_length_0() {
char *x = "abcde";
char *y = "aBd";
clang_analyzer_eval(strncasecmp(x, y, 5) == -1); // expected-warning{{TRUE}}
}
void strncasecmp_diff_length_1() {
char *x = "abc";
char *y = "aBdef";
clang_analyzer_eval(strncasecmp(x, y, 5) == -1); // expected-warning{{TRUE}}
}
void strncasecmp_diff_length_2() {
char *x = "aBcDe";
char *y = "abc";
clang_analyzer_eval(strncasecmp(x, y, 5) == 1); // expected-warning{{TRUE}}
}
void strncasecmp_diff_length_3() {
char *x = "aBc";
char *y = "abcde";
clang_analyzer_eval(strncasecmp(x, y, 5) == -1); // expected-warning{{TRUE}}
}
void strncasecmp_diff_length_4() {
char *x = "abcde";
char *y = "aBc";
clang_analyzer_eval(strncasecmp(x, y, 3) == 0); // expected-warning{{TRUE}}
}
void strncasecmp_diff_length_5() {
char *x = "abcde";
char *y = "aBd";
clang_analyzer_eval(strncasecmp(x, y, 3) == -1); // expected-warning{{TRUE}}
}
void strncasecmp_diff_length_6() {
char *x = "aBDe";
char *y = "abc";
clang_analyzer_eval(strncasecmp(x, y, 3) == 1); // expected-warning{{TRUE}}
}
void strncasecmp_embedded_null () {
clang_analyzer_eval(strncasecmp("ab\0zz", "ab\0yy", 4) == 0); // expected-warning{{TRUE}}
}
//===----------------------------------------------------------------------===
// strsep()
//===----------------------------------------------------------------------===
char *strsep(char **stringp, const char *delim);
void strsep_null_delim(char *s) {
strsep(&s, NULL); // expected-warning{{Null pointer argument in call to strsep()}}
}
void strsep_null_search() {
strsep(NULL, ""); // expected-warning{{Null pointer argument in call to strsep()}}
}
void strsep_return_original_pointer(char *s) {
char *original = s;
char *result = strsep(&s, ""); // no-warning
clang_analyzer_eval(original == result); // expected-warning{{TRUE}}
}
void strsep_null_string() {
char *s = NULL;
char *result = strsep(&s, ""); // no-warning
clang_analyzer_eval(result == NULL); // expected-warning{{TRUE}}
}
void strsep_changes_input_pointer(char *s) {
char *original = s;
strsep(&s, ""); // no-warning
clang_analyzer_eval(s == original); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(s == NULL); // expected-warning{{UNKNOWN}}
// Check that the value is symbolic.
if (s == NULL) {
clang_analyzer_eval(s == NULL); // expected-warning{{TRUE}}
}
}
void strsep_changes_input_string() {
char str[] = "abc";
clang_analyzer_eval(str[1] == 'b'); // expected-warning{{TRUE}}
char *s = str;
strsep(&s, "b"); // no-warning
// The real strsep will change the first delimiter it finds into a NUL
// character. For now, we just model the invalidation.
clang_analyzer_eval(str[1] == 'b'); // expected-warning{{UNKNOWN}}
}
//===----------------------------------------------------------------------===
// FIXMEs
//===----------------------------------------------------------------------===
// The analyzer_eval call below should evaluate to true. We are being too
// aggressive in marking the (length of) src symbol dead. The length of dst
// depends on src. This could be explicitely specified in the checker or the
// logic for handling MetadataSymbol in SymbolManager needs to change.
void strcat_symbolic_src_length(char *src) {
char dst[8] = "1234";
strcat(dst, src);
clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{UNKNOWN}}
}
// The analyzer_eval call below should evaluate to true. Most likely the same
// issue as the test above.
void strncpy_exactly_matching_buffer2(char *y) {
if (strlen(y) >= 4)
return;
char x[4];
strncpy(x, y, 4); // no-warning
// This time, we know that y fits in x anyway.
clang_analyzer_eval(strlen(x) <= 3); // expected-warning{{UNKNOWN}}
}
Reference in a new issue Copy permalink