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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <fcntl.h>
     30 #include <stdarg.h>
     31 #include <stdlib.h>
     32 #include <unistd.h>
     33 
     34 #include "private/bionic_fortify.h"
     35 
     36 extern "C" int __openat(int, const char*, int, int);
     37 
     38 static inline int force_O_LARGEFILE(int flags) {
     39 #if defined(__LP64__)
     40   return flags; // No need, and aarch64's strace gets confused.
     41 #else
     42   return flags | O_LARGEFILE;
     43 #endif
     44 }
     45 
     46 static inline bool needs_mode(int flags) {
     47   return ((flags & O_CREAT) == O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
     48 }
     49 
     50 int creat(const char* pathname, mode_t mode) {
     51   return open(pathname, O_CREAT | O_TRUNC | O_WRONLY, mode);
     52 }
     53 __strong_alias(creat64, creat);
     54 
     55 int open(const char* pathname, int flags, ...) {
     56   mode_t mode = 0;
     57 
     58   if (needs_mode(flags)) {
     59     va_list args;
     60     va_start(args, flags);
     61     mode = static_cast<mode_t>(va_arg(args, int));
     62     va_end(args);
     63   }
     64 
     65   return __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), mode);
     66 }
     67 __strong_alias(open64, open);
     68 
     69 int __open_2(const char* pathname, int flags) {
     70   if (needs_mode(flags)) __fortify_fatal("open: called with O_CREAT/O_TMPFILE but no mode");
     71   return __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), 0);
     72 }
     73 
     74 int openat(int fd, const char *pathname, int flags, ...) {
     75   mode_t mode = 0;
     76 
     77   if (needs_mode(flags)) {
     78     va_list args;
     79     va_start(args, flags);
     80     mode = static_cast<mode_t>(va_arg(args, int));
     81     va_end(args);
     82   }
     83 
     84   return __openat(fd, pathname, force_O_LARGEFILE(flags), mode);
     85 }
     86 __strong_alias(openat64, openat);
     87 
     88 int __openat_2(int fd, const char* pathname, int flags) {
     89   if (needs_mode(flags)) __fortify_fatal("open: called with O_CREAT/O_TMPFILE but no mode");
     90   return __openat(fd, pathname, force_O_LARGEFILE(flags), 0);
     91 }
     92