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Diffstat (limited to 'gcc/testsuite/gcc.c-torture/execute/builtins/strncpy-chk.c')
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/builtins/strncpy-chk.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/builtins/strncpy-chk.c b/gcc/testsuite/gcc.c-torture/execute/builtins/strncpy-chk.c new file mode 100644 index 00000000000..46f3374c4dd --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/builtins/strncpy-chk.c @@ -0,0 +1,227 @@ +/* Copyright (C) 2004, 2005 Free Software Foundation. + + Ensure builtin __strncpy_chk performs correctly. */ + +extern void abort (void); +typedef __SIZE_TYPE__ size_t; +extern size_t strlen(const char *); +extern void *memcpy (void *, const void *, size_t); +extern char *strncpy (char *, const char *, size_t); +extern int memcmp (const void *, const void *, size_t); +extern int strcmp (const char *, const char *); +extern int strncmp (const char *, const char *, size_t); +extern void *memset (void *, int, size_t); + +#include "chk.h" + +const char s1[] = "123"; +char p[32] = ""; +char *s2 = "defg"; +char *s3 = "FGH"; +char *s4; +size_t l1 = 1; +int i; + +void +__attribute__((noinline)) +test1 (void) +{ + const char *const src = "hello world"; + const char *src2; + char dst[64], *dst2; + + strncpy_disallowed = 1; + chk_calls = 0; + + memset (dst, 0, sizeof (dst)); + if (strncpy (dst, src, 4) != dst || strncmp (dst, src, 4)) + abort(); + + memset (dst, 0, sizeof (dst)); + if (strncpy (dst+16, src, 4) != dst+16 || strncmp (dst+16, src, 4)) + abort(); + + memset (dst, 0, sizeof (dst)); + if (strncpy (dst+32, src+5, 4) != dst+32 || strncmp (dst+32, src+5, 4)) + abort(); + + memset (dst, 0, sizeof (dst)); + dst2 = dst; + if (strncpy (++dst2, src+5, 4) != dst+1 || strncmp (dst2, src+5, 4) + || dst2 != dst+1) + abort(); + + memset (dst, 0, sizeof (dst)); + if (strncpy (dst, src, 0) != dst || strcmp (dst, "")) + abort(); + + memset (dst, 0, sizeof (dst)); + dst2 = dst; src2 = src; + if (strncpy (++dst2, ++src2, 0) != dst+1 || strcmp (dst2, "") + || dst2 != dst+1 || src2 != src+1) + abort(); + + memset (dst, 0, sizeof (dst)); + dst2 = dst; src2 = src; + if (strncpy (++dst2+5, ++src2+5, 0) != dst+6 || strcmp (dst2+5, "") + || dst2 != dst+1 || src2 != src+1) + abort(); + + memset (dst, 0, sizeof (dst)); + if (strncpy (dst, src, 12) != dst || strcmp (dst, src)) + abort(); + + /* Test at least one instance of the __builtin_ style. We do this + to ensure that it works and that the prototype is correct. */ + memset (dst, 0, sizeof (dst)); + if (__builtin_strncpy (dst, src, 4) != dst || strncmp (dst, src, 4)) + abort(); + + memset (dst, 0, sizeof (dst)); + if (strncpy (dst, i++ ? "xfoo" + 1 : "bar", 4) != dst + || strcmp (dst, "bar") + || i != 1) + abort (); + + if (chk_calls) + abort (); + strncpy_disallowed = 0; +} + +void +__attribute__((noinline)) +test2 (void) +{ + chk_calls = 0; + /* No runtime checking should be done here, both destination + and length are unknown. */ + strncpy (s4, "abcd", l1 + 1); + if (chk_calls) + abort (); +} + +/* Test whether compile time checking is done where it should + and so is runtime object size checking. */ +void +__attribute__((noinline)) +test3 (void) +{ + struct A { char buf1[10]; char buf2[10]; } a; + char *r = l1 == 1 ? &a.buf1[5] : &a.buf2[4]; + char buf3[20]; + int i; + const char *l; + size_t l2; + + /* The following calls should do runtime checking + - source length is not known, but destination is. */ + chk_calls = 0; + strncpy (a.buf1 + 2, s3 + 3, l1); + strncpy (r, s3 + 2, l1 + 2); + r = l1 == 1 ? __builtin_alloca (4) : &a.buf2[7]; + strncpy (r, s2 + 2, l1 + 2); + strncpy (r + 2, s3 + 3, l1); + r = buf3; + for (i = 0; i < 4; ++i) + { + if (i == l1 - 1) + r = &a.buf1[1]; + else if (i == l1) + r = &a.buf2[7]; + else if (i == l1 + 1) + r = &buf3[5]; + else if (i == l1 + 2) + r = &a.buf1[9]; + } + strncpy (r, s2 + 4, l1); + if (chk_calls != 5) + abort (); + + /* Following have known destination and known length, + so if optimizing certainly shouldn't result in the checking + variants. */ + chk_calls = 0; + strncpy (a.buf1 + 2, "", 3); + strncpy (a.buf1 + 2, "", 0); + strncpy (r, "a", 1); + strncpy (r, "a", 3); + r = l1 == 1 ? __builtin_alloca (4) : &a.buf2[7]; + strncpy (r, s1 + 1, 3); + strncpy (r, s1 + 1, 2); + r = buf3; + l = "abc"; + l2 = 4; + for (i = 0; i < 4; ++i) + { + if (i == l1 - 1) + r = &a.buf1[1], l = "e", l2 = 2; + else if (i == l1) + r = &a.buf2[7], l = "gh", l2 = 3; + else if (i == l1 + 1) + r = &buf3[5], l = "jkl", l2 = 4; + else if (i == l1 + 2) + r = &a.buf1[9], l = "", l2 = 1; + } + strncpy (r, "", 1); + /* Here, strlen (l) + 1 is known to be at most 4 and + __builtin_object_size (&buf3[16], 0) is 4, so this doesn't need + runtime checking. */ + strncpy (&buf3[16], l, l2); + strncpy (&buf3[15], "abc", l2); + strncpy (&buf3[10], "fghij", l2); + if (chk_calls) + abort (); + chk_calls = 0; +} + +/* Test whether runtime and/or compile time checking catches + buffer overflows. */ +void +__attribute__((noinline)) +test4 (void) +{ + struct A { char buf1[10]; char buf2[10]; } a; + char buf3[20]; + + chk_fail_allowed = 1; + /* Runtime checks. */ + if (__builtin_setjmp (chk_fail_buf) == 0) + { + strncpy (&a.buf2[9], s2 + 4, l1 + 1); + abort (); + } + if (__builtin_setjmp (chk_fail_buf) == 0) + { + strncpy (&a.buf2[7], s3, l1 + 4); + abort (); + } + /* This should be detectable at compile time already. */ + if (__builtin_setjmp (chk_fail_buf) == 0) + { + strncpy (&buf3[19], "abc", 2); + abort (); + } + if (__builtin_setjmp (chk_fail_buf) == 0) + { + strncpy (&buf3[18], "", 3); + abort (); + } + chk_fail_allowed = 0; +} + +void +main_test (void) +{ +#ifndef __OPTIMIZE__ + /* Object size checking is only intended for -O[s123]. */ + return; +#endif + __asm ("" : "=r" (s2) : "0" (s2)); + __asm ("" : "=r" (s3) : "0" (s3)); + __asm ("" : "=r" (l1) : "0" (l1)); + test1 (); + s4 = p; + test2 (); + test3 (); + test4 (); +} |