forked from OSchip/llvm-project
431 lines
10 KiB
C
431 lines
10 KiB
C
// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.experimental.CString -analyzer-store=region -Wno-null-dereference -verify %s
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// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core,unix.experimental.CString -analyzer-store=region -Wno-null-dereference -verify %s
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// RUN: %clang_cc1 -analyze -DVARIANT -analyzer-checker=core,unix.experimental.CString -analyzer-store=region -Wno-null-dereference -verify %s
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// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -analyzer-checker=core,unix.experimental.CString -analyzer-store=region -Wno-null-dereference -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 available 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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typedef typeof(sizeof(int)) size_t;
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//===----------------------------------------------------------------------===
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// memcpy()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define __memcpy_chk BUILTIN(__memcpy_chk)
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void *__memcpy_chk(void *restrict s1, const void *restrict s2, size_t n,
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size_t destlen);
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#define memcpy(a,b,c) __memcpy_chk(a,b,c,(size_t)-1)
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#else /* VARIANT */
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#define memcpy BUILTIN(memcpy)
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void *memcpy(void *restrict s1, const void *restrict s2, size_t n);
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#endif /* VARIANT */
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void memcpy0 () {
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char src[] = {1, 2, 3, 4};
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char dst[4] = {0};
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memcpy(dst, src, 4); // no-warning
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if (memcpy(dst, src, 4) != dst) {
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(void)*(char*)0; // no-warning
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}
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if (dst[0] != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void memcpy1 () {
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char src[] = {1, 2, 3, 4};
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char dst[10];
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memcpy(dst, src, 5); // expected-warning{{Memory copy function accesses out-of-bound array element}}
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}
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void memcpy2 () {
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char src[] = {1, 2, 3, 4};
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char dst[1];
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memcpy(dst, src, 4); // expected-warning{{Memory copy function overflows destination buffer}}
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}
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void memcpy3 () {
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char src[] = {1, 2, 3, 4};
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char dst[3];
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memcpy(dst+1, src+2, 2); // no-warning
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}
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void memcpy4 () {
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char src[] = {1, 2, 3, 4};
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char dst[10];
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memcpy(dst+2, src+2, 3); // expected-warning{{Memory copy function accesses out-of-bound array element}}
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}
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void memcpy5() {
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char src[] = {1, 2, 3, 4};
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char dst[3];
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memcpy(dst+2, src+2, 2); // expected-warning{{Memory copy function overflows destination buffer}}
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}
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void memcpy6() {
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int a[4] = {0};
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memcpy(a, a, 8); // expected-warning{{overlapping}}
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}
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void memcpy7() {
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int a[4] = {0};
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memcpy(a+2, a+1, 8); // expected-warning{{overlapping}}
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}
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void memcpy8() {
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int a[4] = {0};
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memcpy(a+1, a+2, 8); // expected-warning{{overlapping}}
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}
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void memcpy9() {
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int a[4] = {0};
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memcpy(a+2, a+1, 4); // no-warning
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memcpy(a+1, a+2, 4); // no-warning
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}
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void memcpy10() {
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char a[4] = {0};
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memcpy(0, a, 4); // expected-warning{{Null pointer argument in call to memory copy function}}
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}
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void memcpy11() {
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char a[4] = {0};
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memcpy(a, 0, 4); // expected-warning{{Null pointer argument in call to memory copy function}}
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}
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void memcpy12() {
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char a[4] = {0};
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memcpy(0, a, 0); // no-warning
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}
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void memcpy13() {
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char a[4] = {0};
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memcpy(a, 0, 0); // no-warning
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}
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void memcpy_unknown_size (size_t n) {
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char a[4], b[4] = {1};
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if (memcpy(a, b, n) != a)
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(void)*(char*)0; // no-warning
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}
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void memcpy_unknown_size_warn (size_t n) {
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char a[4];
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if (memcpy(a, 0, n) != a) // expected-warning{{Null pointer argument in call to memory copy function}}
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(void)*(char*)0; // no-warning
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}
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//===----------------------------------------------------------------------===
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// mempcpy()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define __mempcpy_chk BUILTIN(__mempcpy_chk)
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void *__mempcpy_chk(void *restrict s1, const void *restrict s2, size_t n,
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size_t destlen);
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#define mempcpy(a,b,c) __mempcpy_chk(a,b,c,(size_t)-1)
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#else /* VARIANT */
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#define mempcpy BUILTIN(mempcpy)
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void *mempcpy(void *restrict s1, const void *restrict s2, size_t n);
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#endif /* VARIANT */
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void mempcpy0 () {
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char src[] = {1, 2, 3, 4};
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char dst[5] = {0};
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mempcpy(dst, src, 4); // no-warning
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if (mempcpy(dst, src, 4) != &dst[4]) {
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(void)*(char*)0; // no-warning
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}
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if (dst[0] != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void mempcpy1 () {
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char src[] = {1, 2, 3, 4};
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char dst[10];
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mempcpy(dst, src, 5); // expected-warning{{Memory copy function accesses out-of-bound array element}}
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}
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void mempcpy2 () {
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char src[] = {1, 2, 3, 4};
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char dst[1];
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mempcpy(dst, src, 4); // expected-warning{{Memory copy function overflows destination buffer}}
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}
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void mempcpy3 () {
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char src[] = {1, 2, 3, 4};
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char dst[3];
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mempcpy(dst+1, src+2, 2); // no-warning
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}
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void mempcpy4 () {
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char src[] = {1, 2, 3, 4};
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char dst[10];
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mempcpy(dst+2, src+2, 3); // expected-warning{{Memory copy function accesses out-of-bound array element}}
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}
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void mempcpy5() {
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char src[] = {1, 2, 3, 4};
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char dst[3];
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mempcpy(dst+2, src+2, 2); // expected-warning{{Memory copy function overflows destination buffer}}
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}
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void mempcpy6() {
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int a[4] = {0};
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mempcpy(a, a, 8); // expected-warning{{overlapping}}
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}
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void mempcpy7() {
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int a[4] = {0};
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mempcpy(a+2, a+1, 8); // expected-warning{{overlapping}}
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}
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void mempcpy8() {
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int a[4] = {0};
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mempcpy(a+1, a+2, 8); // expected-warning{{overlapping}}
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}
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void mempcpy9() {
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int a[4] = {0};
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mempcpy(a+2, a+1, 4); // no-warning
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mempcpy(a+1, a+2, 4); // no-warning
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}
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void mempcpy10() {
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char a[4] = {0};
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mempcpy(0, a, 4); // expected-warning{{Null pointer argument in call to memory copy function}}
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}
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void mempcpy11() {
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char a[4] = {0};
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mempcpy(a, 0, 4); // expected-warning{{Null pointer argument in call to memory copy function}}
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}
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void mempcpy12() {
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char a[4] = {0};
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mempcpy(0, a, 0); // no-warning
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}
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void mempcpy13() {
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char a[4] = {0};
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mempcpy(a, 0, 0); // no-warning
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}
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void mempcpy_unknown_size_warn (size_t n) {
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char a[4];
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if (mempcpy(a, 0, n) != a) // expected-warning{{Null pointer argument in call to memory copy function}}
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(void)*(char*)0; // no-warning
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}
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void mempcpy_unknownable_size (char *src, float n) {
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char a[4];
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// This used to crash because we don't model floats.
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mempcpy(a, src, (size_t)n);
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}
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//===----------------------------------------------------------------------===
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// memmove()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define __memmove_chk BUILTIN(__memmove_chk)
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void *__memmove_chk(void *s1, const void *s2, size_t n, size_t destlen);
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#define memmove(a,b,c) __memmove_chk(a,b,c,(size_t)-1)
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#else /* VARIANT */
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#define memmove BUILTIN(memmove)
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void *memmove(void *s1, const void *s2, size_t n);
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#endif /* VARIANT */
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void memmove0 () {
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char src[] = {1, 2, 3, 4};
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char dst[4] = {0};
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memmove(dst, src, 4); // no-warning
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if (memmove(dst, src, 4) != dst) {
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(void)*(char*)0; // no-warning
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}
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if (dst[0] != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void memmove1 () {
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char src[] = {1, 2, 3, 4};
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char dst[10];
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memmove(dst, src, 5); // expected-warning{{out-of-bound}}
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}
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void memmove2 () {
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char src[] = {1, 2, 3, 4};
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char dst[1];
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memmove(dst, src, 4); // expected-warning{{overflow}}
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}
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//===----------------------------------------------------------------------===
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// memcmp()
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//===----------------------------------------------------------------------===
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#ifdef VARIANT
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#define bcmp BUILTIN(bcmp)
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// __builtin_bcmp is not defined with const in Builtins.def.
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int bcmp(/*const*/ void *s1, /*const*/ void *s2, size_t n);
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#define memcmp bcmp
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#else /* VARIANT */
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#define memcmp BUILTIN(memcmp)
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int memcmp(const void *s1, const void *s2, size_t n);
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#endif /* VARIANT */
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void memcmp0 () {
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char a[] = {1, 2, 3, 4};
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char b[4] = { 0 };
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memcmp(a, b, 4); // no-warning
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}
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void memcmp1 () {
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char a[] = {1, 2, 3, 4};
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char b[10] = { 0 };
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memcmp(a, b, 5); // expected-warning{{out-of-bound}}
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}
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void memcmp2 () {
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char a[] = {1, 2, 3, 4};
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char b[1] = { 0 };
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memcmp(a, b, 4); // expected-warning{{out-of-bound}}
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}
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void memcmp3 () {
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char a[] = {1, 2, 3, 4};
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if (memcmp(a, a, 4))
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(void)*(char*)0; // no-warning
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}
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void memcmp4 (char *input) {
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char a[] = {1, 2, 3, 4};
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if (memcmp(a, input, 4))
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(void)*(char*)0; // expected-warning{{null}}
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}
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void memcmp5 (char *input) {
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char a[] = {1, 2, 3, 4};
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if (memcmp(a, 0, 0)) // no-warning
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(void)*(char*)0; // no-warning
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if (memcmp(0, a, 0)) // no-warning
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(void)*(char*)0; // no-warning
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if (memcmp(a, input, 0)) // no-warning
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(void)*(char*)0; // no-warning
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}
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void memcmp6 (char *a, char *b, size_t n) {
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int result = memcmp(a, b, n);
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if (result != 0)
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return;
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if (n == 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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int memcmp7 (char *a, size_t x, size_t y, size_t n) {
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// We used to crash when either of the arguments was unknown.
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return memcmp(a, &a[x*y], n) +
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memcmp(&a[x*y], a, n);
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}
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//===----------------------------------------------------------------------===
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// bcopy()
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//===----------------------------------------------------------------------===
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#define bcopy BUILTIN(bcopy)
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// __builtin_bcopy is not defined with const in Builtins.def.
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void bcopy(/*const*/ void *s1, void *s2, size_t n);
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void bcopy0 () {
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char src[] = {1, 2, 3, 4};
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char dst[4] = {0};
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bcopy(src, dst, 4); // no-warning
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if (dst[0] != 0)
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(void)*(char*)0; // expected-warning{{null}}
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}
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void bcopy1 () {
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char src[] = {1, 2, 3, 4};
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char dst[10];
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bcopy(src, dst, 5); // expected-warning{{out-of-bound}}
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}
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void bcopy2 () {
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char src[] = {1, 2, 3, 4};
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char dst[1];
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bcopy(src, dst, 4); // expected-warning{{overflow}}
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}
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