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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_fdtrack.h"
35 #include "private/bionic_fortify.h"
36 
37 extern "C" int __openat(int, const char*, int, int);
38 
force_O_LARGEFILE(int flags)39 static inline int force_O_LARGEFILE(int flags) {
40 #if defined(__LP64__)
41   return flags; // No need, and aarch64's strace gets confused.
42 #else
43   return flags | O_LARGEFILE;
44 #endif
45 }
46 
needs_mode(int flags)47 static inline bool needs_mode(int flags) {
48   return ((flags & O_CREAT) == O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
49 }
50 
creat(const char * pathname,mode_t mode)51 int creat(const char* pathname, mode_t mode) {
52   return open(pathname, O_CREAT | O_TRUNC | O_WRONLY, mode);
53 }
54 __strong_alias(creat64, creat);
55 
open(const char * pathname,int flags,...)56 int open(const char* pathname, int flags, ...) {
57   mode_t mode = 0;
58 
59   if (needs_mode(flags)) {
60     va_list args;
61     va_start(args, flags);
62     mode = static_cast<mode_t>(va_arg(args, int));
63     va_end(args);
64   }
65 
66   return FDTRACK_CREATE(__openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), mode));
67 }
68 __strong_alias(open64, open);
69 
__open_2(const char * pathname,int flags)70 int __open_2(const char* pathname, int flags) {
71   if (needs_mode(flags)) __fortify_fatal("open: called with O_CREAT/O_TMPFILE but no mode");
72   return FDTRACK_CREATE_NAME("open", __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), 0));
73 }
74 
openat(int fd,const char * pathname,int flags,...)75 int openat(int fd, const char *pathname, int flags, ...) {
76   mode_t mode = 0;
77 
78   if (needs_mode(flags)) {
79     va_list args;
80     va_start(args, flags);
81     mode = static_cast<mode_t>(va_arg(args, int));
82     va_end(args);
83   }
84 
85   return FDTRACK_CREATE_NAME("openat", __openat(fd, pathname, force_O_LARGEFILE(flags), mode));
86 }
87 __strong_alias(openat64, openat);
88 
__openat_2(int fd,const char * pathname,int flags)89 int __openat_2(int fd, const char* pathname, int flags) {
90   if (needs_mode(flags)) __fortify_fatal("open: called with O_CREAT/O_TMPFILE but no mode");
91   return FDTRACK_CREATE_NAME("openat", __openat(fd, pathname, force_O_LARGEFILE(flags), 0));
92 }
93