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Diffstat (limited to 'posix/tst-mmap-offset.c')
-rw-r--r-- | posix/tst-mmap-offset.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/posix/tst-mmap-offset.c b/posix/tst-mmap-offset.c new file mode 100644 index 0000000000..53e78559c2 --- /dev/null +++ b/posix/tst-mmap-offset.c @@ -0,0 +1,67 @@ +/* BZ #18877 mmap offset test. + + Copyright (C) 2015-2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/mman.h> + +static int +printmsg (int rc, const char *msg) +{ + printf ("%s failed: %m\n", msg); + return rc; +} + +/* Check if negative offsets are handled correctly by mmap. */ +static int +do_test (void) +{ + const int prot = PROT_READ | PROT_WRITE; + const int flags = MAP_SHARED; + const unsigned long length = 0x10000; + const unsigned long offset = 0xace00000; + const unsigned long size = offset + length; + void *addr; + int fd; + char fname[] = "tst-mmap-offset-XXXXXX"; + + fd = mkstemp64 (fname); + if (fd < 0) + return printmsg (1, "mkstemp"); + + if (unlink (fname)) + return printmsg (1, "unlink"); + + if (ftruncate64 (fd, size)) + return printmsg (0, "ftruncate64"); + + addr = mmap (NULL, length, prot, flags, fd, offset); + if (MAP_FAILED == addr) + return printmsg (1, "mmap"); + + /* This memcpy is likely to SIGBUS if mmap has messed up with offset. */ + memcpy (addr, fname, sizeof (fname)); + + return 0; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |