Attachment 1458577 Details for Bug 1600733 – fSource ode for reproducer valgrind errors

fSource ode for reproducer valgrind errors

test.c (text/x-csrc), 1.89 KB, created by Lukas Slebodnik on 2018-07-12 21:22:06 UTC

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Creator: Lukas Slebodnik

Created: 2018-07-12 21:22:06 UTC

Size: 1.89 KB

patch

obsolete

>/*
> * This program has various memory related problems that provide a good way
> * to show off the various abilities of valgrind.  To run it:
> *
> *   valgrind <optional valgrind options> ./valgrind-tests <test number>
> *
> * where <test number> is between 1 and 9, inclusive.  Suggested
> * valgrind options to run with are
> *
> *   --logfile=valgrind.output --num-callers=6 --leak-check=yes
> */
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <unistd.h>
>
>void
>test_1()
>{
>  // This test provides an example of using uninitialised memory
>  int i;
>  printf("%d\n", i);               // Error, i hasn't been initialized
>
>  int * num = (int*)malloc(sizeof(int));
>  printf("%d\n", *num);            // Error, *num hasn't been initialized
>  free(num);
>}
>
>void
>test_3()
>{
>  // This test provides an example of reading/writing off the end of
>  // malloc'd blocks
>  int * i = (int*)malloc(sizeof(int)*10);
>  i[10] = 13;                      // Error, wrote past the end of the block
>  printf("%d\n", i[-1]);           // Error, read from before start of the block
>  free(i);
>  test_1();
>}
>
>void
>test_4()
>{
>  // This test provides an example of reading/writing inappropriate
>  // areas on the stack.  Note that valgrind only catches errors below
>  // the stack (so in this example, we have to pass a negative index
>  // to ptr or valgrind won't catch the problem)
>  int i;
>  int * ptr = &i;
>  ptr[-8] = 7;                     // Error, writing to a bad location on stack
>  i = ptr[-15];                    // Error, reading from a bad stack location
>  test_3();
>}
>
>void
>test_7()
>{
>  // This test provides an example of overlapping src and dst
>  // pointers in memcpy() and related functions
>  char big_buf[1000];
>  char * ptr_1 = &big_buf[0];
>  char * ptr_2 = &big_buf[400];
>  memcpy(ptr_1, ptr_2, 500);       // Error, dst region overlaps src region
>  test_4();
>}
>
>int
>main(int argc, char**argv)
>{
>
>  test_7();
>
>  return 0;
>}

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Attachments on bug 1600733: 1458577