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
force_O_LARGEFILE(int flags)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
needs_mode(int flags)46 static inline bool needs_mode(int flags) {
47 return ((flags & O_CREAT) == O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
48 }
49
creat(const char * pathname,mode_t mode)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
open(const char * pathname,int flags,...)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
__open_2(const char * pathname,int flags)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
openat(int fd,const char * pathname,int flags,...)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
__openat_2(int fd,const char * pathname,int flags)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