forked from OSchip/llvm-project
441 lines
12 KiB
C
441 lines
12 KiB
C
// RUN: %clang_cc1 -analyze -analyzer-checker=core,core.experimental.CString,core.experimental.UnreachableCode -analyzer-store=region -verify %s
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// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core,core.experimental.CString,core.experimental.UnreachableCode -analyzer-store=region -verify %s
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// RUN: %clang_cc1 -analyze -DVARIANT -analyzer-checker=core,core.experimental.CString,core.experimental.UnreachableCode -analyzer-store=region -verify %s
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// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -analyzer-checker=core,core.experimental.CString,core.experimental.UnreachableCode -analyzer-store=region -verify %s
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//===----------------------------------------------------------------------===
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// Declarations
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//===----------------------------------------------------------------------===
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// Some functions are so similar to each other that they follow the same code
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// path, such as memcpy and __memcpy_chk, or memcmp and bcmp. If VARIANT is
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// defined, make sure to use the variants instead to make sure they are still
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// checked by the analyzer.
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// Some functions are implemented as builtins. These should be #defined as
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// BUILTIN(f), which will prepend "__builtin_" if USE_BUILTINS is defined.
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// Functions that have variants and are also availabe as builtins should be
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// declared carefully! See memcpy() for an example.
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#ifdef USE_BUILTINS
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# define BUILTIN(f) __builtin_ ## f
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#else /* USE_BUILTINS */
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# define BUILTIN(f) f
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#endif /* USE_BUILTINS */
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#define NULL 0
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typedef typeof(sizeof(int)) size_t;
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//===----------------------------------------------------------------------===
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// strlen()
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//===----------------------------------------------------------------------===
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#define strlen BUILTIN(strlen)
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size_t strlen(const char *s);
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void strlen_constant0() {
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if (strlen("123") != 3)
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(void)*(char*)0; // no-warning
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}
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void strlen_constant1() {
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const char *a = "123";
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if (strlen(a) != 3)
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(void)*(char*)0; // no-warning
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}
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void strlen_constant2(char x) {
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char a[] = "123";
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if (strlen(a) != 3)
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(void)*(char*)0; // no-warning
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a[0] = x;
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if (strlen(a) != 3)
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(void)*(char*)0; // expected-warning{{null}}
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}
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size_t strlen_null() {
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return strlen(0); // expected-warning{{Null pointer argument in call to byte string function}}
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}
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size_t strlen_fn() {
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return strlen((char*)&strlen_fn); // expected-warning{{Argument to byte string function is the address of the function 'strlen_fn', which is not a null-terminated string}}
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}
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size_t strlen_nonloc() {
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label:
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return strlen((char*)&&label); // expected-warning{{Argument to byte string function is the address of the label 'label', which is not a null-terminated string}}
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}
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void strlen_subregion() {
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struct two_strings { char a[2], b[2]; };
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extern void use_two_strings(struct two_strings *);
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struct two_strings z;
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use_two_strings(&z);
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size_t a = strlen(z.a);
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z.b[0] = 5;
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size_t b = strlen(z.a);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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use_two_strings(&z);
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size_t c = strlen(z.a);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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extern void use_string(char *);
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void strlen_argument(char *x) {
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size_t a = strlen(x);
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size_t b = strlen(x);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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use_string(x);
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size_t c = strlen(x);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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extern char global_str[];
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void strlen_global() {
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size_t a = strlen(global_str);
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size_t b = strlen(global_str);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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// Call a function with unknown effects, which should invalidate globals.
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use_string(0);
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size_t c = strlen(global_str);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strlen_indirect(char *x) {
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size_t a = strlen(x);
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char *p = x;
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char **p2 = &p;
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size_t b = strlen(x);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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extern void use_string_ptr(char*const*);
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use_string_ptr(p2);
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size_t c = strlen(x);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strlen_liveness(const char *x) {
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if (strlen(x) < 5)
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return;
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if (strlen(x) < 5)
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(void)*(char*)0; // no-warning
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}
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//===----------------------------------------------------------------------===
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// strnlen()
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//===----------------------------------------------------------------------===
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#define strnlen BUILTIN(strnlen)
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size_t strnlen(const char *s, size_t maxlen);
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void strnlen_constant0() {
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if (strnlen("123", 10) != 3)
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(void)*(char*)0; // no-warning
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}
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void strnlen_constant1() {
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const char *a = "123";
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if (strnlen(a, 10) != 3)
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(void)*(char*)0; // no-warning
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}
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void strnlen_constant2(char x) {
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char a[] = "123";
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if (strnlen(a, 10) != 3)
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(void)*(char*)0; // no-warning
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a[0] = x;
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if (strnlen(a, 10) != 3)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strnlen_constant4() {
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if (strnlen("123456", 3) != 3)
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(void)*(char*)0; // no-warning
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}
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void strnlen_constant5() {
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const char *a = "123456";
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if (strnlen(a, 3) != 3)
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(void)*(char*)0; // no-warning
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}
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void strnlen_constant6(char x) {
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char a[] = "123456";
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if (strnlen(a, 3) != 3)
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(void)*(char*)0; // no-warning
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a[0] = x;
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if (strnlen(a, 3) != 3)
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(void)*(char*)0; // expected-warning{{null}}
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}
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size_t strnlen_null() {
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return strnlen(0, 3); // expected-warning{{Null pointer argument in call to byte string function}}
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}
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size_t strnlen_fn() {
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return strnlen((char*)&strlen_fn, 3); // expected-warning{{Argument to byte string function is the address of the function 'strlen_fn', which is not a null-terminated string}}
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}
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size_t strnlen_nonloc() {
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label:
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return strnlen((char*)&&label, 3); // expected-warning{{Argument to byte string function is the address of the label 'label', which is not a null-terminated string}}
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}
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void strnlen_subregion() {
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struct two_stringsn { char a[2], b[2]; };
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extern void use_two_stringsn(struct two_stringsn *);
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struct two_stringsn z;
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use_two_stringsn(&z);
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size_t a = strnlen(z.a, 10);
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z.b[0] = 5;
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size_t b = strnlen(z.a, 10);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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use_two_stringsn(&z);
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size_t c = strnlen(z.a, 10);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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extern void use_stringn(char *);
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void strnlen_argument(char *x) {
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size_t a = strnlen(x, 10);
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size_t b = strnlen(x, 10);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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use_stringn(x);
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size_t c = strnlen(x, 10);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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extern char global_strn[];
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void strnlen_global() {
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size_t a = strnlen(global_strn, 10);
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size_t b = strnlen(global_strn, 10);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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// Call a function with unknown effects, which should invalidate globals.
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use_stringn(0);
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size_t c = strnlen(global_str, 10);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strnlen_indirect(char *x) {
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size_t a = strnlen(x, 10);
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char *p = x;
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char **p2 = &p;
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size_t b = strnlen(x, 10);
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if (a == 0 && b != 0)
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(void)*(char*)0; // expected-warning{{never executed}}
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extern void use_stringn_ptr(char*const*);
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use_stringn_ptr(p2);
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size_t c = strnlen(x, 10);
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if (a == 0 && c != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strnlen_liveness(const char *x) {
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if (strnlen(x, 10) < 5)
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return;
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if (strnlen(x, 10) < 5)
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(void)*(char*)0; // no-warning
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}
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//===----------------------------------------------------------------------===
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// strcpy()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define __strcpy_chk BUILTIN(__strcpy_chk)
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char *__strcpy_chk(char *restrict s1, const char *restrict s2, size_t destlen);
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#define strcpy(a,b) __strcpy_chk(a,b,(size_t)-1)
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#else /* VARIANT */
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#define strcpy BUILTIN(strcpy)
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char *strcpy(char *restrict s1, const char *restrict s2);
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#endif /* VARIANT */
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void strcpy_null_dst(char *x) {
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strcpy(NULL, x); // expected-warning{{Null pointer argument in call to byte string function}}
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}
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void strcpy_null_src(char *x) {
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strcpy(x, NULL); // expected-warning{{Null pointer argument in call to byte string function}}
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}
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void strcpy_fn(char *x) {
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strcpy(x, (char*)&strcpy_fn); // expected-warning{{Argument to byte string function is the address of the function 'strcpy_fn', which is not a null-terminated string}}
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}
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void strcpy_effects(char *x, char *y) {
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char a = x[0];
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if (strcpy(x, y) != x)
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(void)*(char*)0; // no-warning
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if (strlen(x) != strlen(y))
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(void)*(char*)0; // no-warning
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if (a != x[0])
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strcpy_overflow(char *y) {
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char x[4];
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if (strlen(y) == 4)
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strcpy(x, y); // expected-warning{{Byte string function overflows destination buffer}}
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}
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void strcpy_no_overflow(char *y) {
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char x[4];
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if (strlen(y) == 3)
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strcpy(x, y); // no-warning
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}
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//===----------------------------------------------------------------------===
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// strncpy()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define __strncpy_chk BUILTIN(__strncpy_chk)
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char *__strncpy_chk(char *restrict s1, const char *restrict s2, size_t n, size_t destlen);
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#define strncpy(a,b,c) __strncpy_chk(a,b,c, (size_t)-1)
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#else /* VARIANT */
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#define strncpy BUILTIN(strncpy)
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char *strncpy(char *restrict s1, const char *restrict s2, size_t n);
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#endif /* VARIANT */
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void strncpy_null_dst(char *x) {
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strncpy(NULL, x, 1); // expected-warning{{Null pointer argument in call to byte string function}}
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}
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void strncpy_null_src(char *x) {
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strncpy(x, NULL, 1); // expected-warning{{Null pointer argument in call to byte string function}}
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}
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void strncpy_fn(char *x) {
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strncpy(x, (char*)&strncpy_fn, 1); // expected-warning{{Argument to byte string function is the address of the function 'strncpy_fn', which is not a null-terminated string}}
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}
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void strncpy_effects(char *x, char *y) {
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char a = x[0];
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if (strncpy(x, y, strlen(y)) != x)
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(void)*(char*)0; // no-warning
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if (strlen(x) != strlen(y))
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(void)*(char*)0; // no-warning
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if (a != x[0])
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(void)*(char*)0; // expected-warning{{null}}
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}
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void strncpy_overflow(char *y) {
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char x[4];
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if (strlen(y) == 4)
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strncpy(x, y, strlen(y)); // expected-warning{{Byte string function overflows destination buffer}}
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}
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void strncpy_len_overflow(char *y) {
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char x[4];
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if (strlen(y) == 3)
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strncpy(x, y, sizeof(x)); // no-warning
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}
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void strncpy_no_overflow(char *y) {
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char x[4];
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if (strlen(y) == 3)
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strncpy(x, y, strlen(y)); // no-warning
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}
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void strncpy_no_len_overflow(char *y) {
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char x[4];
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if (strlen(y) == 4)
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strncpy(x, y, sizeof(x)-1); // no-warning
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}
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//===----------------------------------------------------------------------===
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// stpcpy()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define __stpcpy_chk BUILTIN(__stpcpy_chk)
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char *__stpcpy_chk(char *restrict s1, const char *restrict s2, size_t destlen);
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#define stpcpy(a,b) __stpcpy_chk(a,b,(size_t)-1)
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#else /* VARIANT */
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#define stpcpy BUILTIN(stpcpy)
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char *stpcpy(char *restrict s1, const char *restrict s2);
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#endif /* VARIANT */
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void stpcpy_effect(char *x, char *y) {
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char a = x[0];
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if (stpcpy(x, y) != &x[strlen(y)])
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(void)*(char*)0; // no-warning
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if (strlen(x) != strlen(y))
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(void)*(char*)0; // no-warning
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if (a != x[0])
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(void)*(char*)0; // expected-warning{{null}}
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}
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void stpcpy_overflow(char *y) {
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char x[4];
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if (strlen(y) == 4)
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stpcpy(x, y); // expected-warning{{Byte string function overflows destination buffer}}
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}
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void stpcpy_no_overflow(char *y) {
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char x[4];
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if (strlen(y) == 3)
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stpcpy(x, y); // no-warning
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}
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