65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* A reproducer from https://sourceware.org/bugzilla/show_bug.cgi?id=15362. */
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <signal.h>
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#include <stdlib.h>
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#define CATCH_SIGSEGV 0
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#define FILESIZE (32 * 1024 * 1024)
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static void *buf;
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static void
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sigsegv_handler (int signo, siginfo_t * info, void *context)
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{
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printf ("Caught SIGSEGV at address %p (buf + %lu)\n",
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info->si_addr, (void *) info->si_addr - buf);
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abort ();
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}
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#define handle_error(msg) error(1, errno, msg)
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int
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main (int argc, char *argv[])
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{
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FILE *fp;
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size_t bytes_written;
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int ret;
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struct sigaction sa;
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char * filepath;
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if (argc != 2)
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handle_error ("Invalid number of arguments\n");
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filepath = argv[1];
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buf = mmap (NULL, FILESIZE + 4096, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (buf == MAP_FAILED)
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handle_error ("mmap_failed");
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ret = mprotect (buf + FILESIZE, 4096, PROT_NONE);
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if (ret == -1)
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handle_error ("mprotect failed");
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memset (buf, 0, FILESIZE);
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fp = fopen (filepath, "wb");
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if (!fp)
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handle_error ("fopen(...) failed");
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memset (&sa, 0, sizeof (sa));
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sa.sa_sigaction = sigsegv_handler;
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sa.sa_flags = SA_SIGINFO;
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#if CATCH_SIGSEGV
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sigaction (SIGSEGV, &sa, NULL);
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#endif
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bytes_written = fwrite (buf, 1, FILESIZE, fp);
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printf ("fwrite(): bytes_written = %zu (errno: %m)\n", bytes_written);
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return 0;
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}
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