diff options
Diffstat (limited to 'REORG.TODO/posix/tst-mmap-offset.c')
-rw-r--r-- | REORG.TODO/posix/tst-mmap-offset.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/REORG.TODO/posix/tst-mmap-offset.c b/REORG.TODO/posix/tst-mmap-offset.c new file mode 100644 index 0000000000..5bb88aab10 --- /dev/null +++ b/REORG.TODO/posix/tst-mmap-offset.c @@ -0,0 +1,118 @@ +/* BZ #18877 and #21270 mmap offset test. + + Copyright (C) 2015-2017 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 <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <sys/mman.h> + +#include <support/check.h> + +static int fd; +static long int page_shift; +static char fname[] = "tst-mmap-offset-XXXXXX"; + +static void +do_prepare (int argc, char **argv) +{ + fd = mkstemp64 (fname); + if (fd < 0) + FAIL_EXIT1 ("mkstemp failed"); + + if (unlink (fname)) + FAIL_EXIT1 ("unlink failed"); + + long sz = sysconf(_SC_PAGESIZE); + if (sz == -1) + sz = 4096L; + page_shift = ffs (sz) - 1; +} + +#define PREPARE do_prepare + + +/* Check if negative offsets are handled correctly by mmap. */ +static int +do_test_bz18877 (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; + + if (ftruncate64 (fd, size)) + FAIL_RET ("ftruncate64 failed"); + + addr = mmap (NULL, length, prot, flags, fd, offset); + if (MAP_FAILED == addr) + FAIL_RET ("mmap failed"); + + /* This memcpy is likely to SIGBUS if mmap has messed up with offset. */ + memcpy (addr, fname, sizeof (fname)); + + return 0; +} + +/* Check if invalid offset are handled correctly by mmap. */ +static int +do_test_bz21270 (void) +{ + /* For architectures with sizeof (off_t) < sizeof (off64_t) mmap is + implemented with __SYS_mmap2 syscall and the offset is represented in + multiples of page size. For offset larger than + '1 << (page_shift + 8 * sizeof (off_t))' (that is, 1<<44 on system with + page size of 4096 bytes) the system call silently truncates the offset. + For this case glibc mmap implementation returns EINVAL. */ + const int prot = PROT_READ | PROT_WRITE; + const int flags = MAP_SHARED; + const int64_t offset = 1ULL << (page_shift + 8 * sizeof (uint32_t)); + const size_t length = 4096; + + void *addr = mmap64 (NULL, length, prot, flags, fd, offset); + if (sizeof (off_t) < sizeof (off64_t)) + { + if ((addr != MAP_FAILED) && (errno != EINVAL)) + FAIL_RET ("mmap succeed"); + } + else + { + if (addr == MAP_FAILED) + FAIL_RET ("mmap failed"); + } + + return 0; +} + +int +do_test (void) +{ + int ret = 0; + + ret += do_test_bz18877 (); + ret += do_test_bz21270 (); + + return ret; +} + +#include <support/test-driver.c> |