| /* BZ #18877 and #21270 mmap offset test. |
| |
| Copyright (C) 2015-2018 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[] = "/tmp/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> |