gcc/testsuite/gcc.dg/builtin-stringop-chk-1.c

   1 /* Test whether buffer overflow warnings for __*_chk builtins
   2    are emitted properly.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O2 -std=gnu99 -ftrack-macro-expansion=0" } */
   5 /* { dg-additional-options "-mstructure-size-boundary=8" { target arm*-*-* } } */
   6 // { dg-skip-if "packed attribute missing for t" { "epiphany-*-*" } { "*" } { "" } }
   7
   8 extern void abort (void);
   9
  10 #include "../gcc.c-torture/execute/builtins/chk.h"
  11 #include <stdarg.h>
  12
  13 volatile void *vx;
  14 char buf1[20];
  15 int x;
  16
  17 void
  18 test (int arg, ...)
  19 {
  20   char buf2[20];
  21   va_list ap;
  22   char *p = &buf1[10], *q;
  23
  24   memcpy (&buf2[19], "ab", 1);
  25   memcpy (&buf2[19], "ab", 2); /* { dg-warning "will always overflow" "memcpy" } */
  26   vx = mempcpy (&buf2[19], "ab", 1);
  27   vx = mempcpy (&buf2[19], "ab", 2); /* { dg-warning "will always overflow" "mempcpy" } */
  28   memmove (&buf2[18], &buf1[10], 2);
  29   memmove (&buf2[18], &buf1[10], 3); /* { dg-warning "will always overflow" "memmove" } */
  30   memset (&buf2[16], 'a', 4);
  31   memset (&buf2[15], 'b', 6); /* { dg-warning "will always overflow" "memset" } */
  32   strcpy (&buf2[18], "a");
  33   strcpy (&buf2[18], "ab"); /* { dg-warning "will always overflow" "strcpy" } */
  34   vx = stpcpy (&buf2[18], "a");
  35   vx = stpcpy (&buf2[18], "ab"); /* { dg-warning "will always overflow" "stpcpy" } */
  36   strncpy (&buf2[18], "a", 2);
  37   strncpy (&buf2[18], "a", 3); /* { dg-warning "will always overflow" "strncpy" } */
  38   strncpy (&buf2[18], "abc", 2);
  39   strncpy (&buf2[18], "abc", 3); /* { dg-warning "will always overflow" "strncpy" } */
  40   memset (buf2, '\0', sizeof (buf2));
  41   strcat (&buf2[18], "a");
  42   memset (buf2, '\0', sizeof (buf2));
  43   strcat (&buf2[18], "ab"); /* { dg-warning "will always overflow" "strcat" } */
  44   sprintf (&buf2[18], "%s", buf1);
  45   sprintf (&buf2[18], "%s", "a");
  46   sprintf (&buf2[18], "%s", "ab"); /* { dg-warning "will always overflow" "sprintf" } */
  47   sprintf (&buf2[18], "a");
  48   sprintf (&buf2[18], "ab"); /* { dg-warning "will always overflow" "sprintf" } */
  49   snprintf (&buf2[18], 2, "%d", x);
  50   /* N argument to snprintf is the size of the buffer.
  51      Although this particular call wouldn't overflow buf2,
  52      incorrect buffer size was passed to it and therefore
  53      we want a warning and runtime failure.  */
  54   snprintf (&buf2[18], 3, "%d", x); /* { dg-warning "will always overflow" "snprintf" } */
  55   va_start (ap, arg);
  56   vsprintf (&buf2[18], "a", ap);
  57   va_end (ap);
  58   va_start (ap, arg);
  59   vsprintf (&buf2[18], "ab", ap); /* { dg-warning "will always overflow" "vsprintf" } */
  60   va_end (ap);
  61   va_start (ap, arg);
  62   vsnprintf (&buf2[18], 2, "%s", ap);
  63   va_end (ap);
  64   va_start (ap, arg);
  65   /* See snprintf above.  */
  66   vsnprintf (&buf2[18], 3, "%s", ap); /* { dg-warning "will always overflow" "vsnprintf" } */
  67   va_end (ap);
  68
  69   p = p + 10;
  70   memset (p, 'd', 0);
  71   q = strcpy (p, ""); /* { dg-warning "will always overflow" "strcpy" } */
  72
  73   /* This invokes undefined behaviour, since we are past the end of buf1.  */
  74   p = p + 10;
  75   memset (p, 'd', 1); /* { dg-warning "will always overflow" "memset" } */
  76
  77   memset (q, 'd', 0);
  78   memset (q, 'd', 1); /* { dg-warning "will always overflow" "memset" } */
  79   q = q - 10;
  80   memset (q, 'd', 10);
  81 }
  82
  83 char *str = "ABCDEFG";
  84 typedef struct { char b[16]; } H;
  85
  86 /* Some brown paper bag bugs found in real applications.
  87    This test is here merely for amusement.  */
  88
  89 void
  90 test2 (const H h)
  91 {
  92   char c;
  93   strncpy (&c, str, 3); /* { dg-warning "will always overflow" "strncpy" } */
  94
  95   struct { char b[4]; } x;
  96   sprintf (x.b, "%s", "ABCD"); /* { dg-warning "will always overflow" "sprintf" } */
  97
  98   unsigned int i;
  99   memcpy (&i, &h, sizeof (h)); /* { dg-warning "will always overflow" "memcpy" } */
 100
 101   unsigned char buf[21];
 102   memset (buf + 16, 0, 8); /* { dg-warning "will always overflow" "memset" } */
 103
 104   typedef struct { int i, j, k, l; } S;
 105   S *s[3];
 106   memset (s, 0, sizeof (S) * 3); /* { dg-warning "will always overflow" "memset" } */
 107
 108   struct T { char a[8]; char b[4]; char c[10]; } t;
 109   stpcpy (t.c,"Testing..."); /* { dg-warning "will always overflow" "stpcpy" } */
 110
 111   char b1[7];
 112   char b2[4];
 113   memset (b1, 0, sizeof (b1));
 114   memset (b2, 0, sizeof (b1)); /* { dg-warning "will always overflow" "memset" } */
 115 }