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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) Linux Test Project, 2021-2022
4  * Copyright (c) 2020 Linaro Limited. All rights reserved.
5  * Author: Viresh Kumar <viresh.kumar@linaro.org>
6  */
7 
8 #ifndef LAPI_FSMOUNT_H__
9 #define LAPI_FSMOUNT_H__
10 
11 #include "config.h"
12 #include <sys/syscall.h>
13 #include <sys/types.h>
14 #include <sys/mount.h>
15 
16 #ifndef HAVE_FSOPEN
17 # ifdef HAVE_LINUX_MOUNT_H
18 #  include <linux/mount.h>
19 # endif
20 #endif
21 
22 #include "lapi/fcntl.h"
23 #include "lapi/syscalls.h"
24 
25 /*
26  * Mount attributes.
27  */
28 #ifndef MOUNT_ATTR_RDONLY
29 # define MOUNT_ATTR_RDONLY       0x00000001 /* Mount read-only */
30 #endif
31 #ifndef MOUNT_ATTR_NOSUID
32 # define MOUNT_ATTR_NOSUID       0x00000002 /* Ignore suid and sgid bits */
33 #endif
34 #ifndef MOUNT_ATTR_NODEV
35 # define MOUNT_ATTR_NODEV        0x00000004 /* Disallow access to device special files */
36 #endif
37 #ifndef MOUNT_ATTR_NOEXEC
38 # define MOUNT_ATTR_NOEXEC       0x00000008 /* Disallow program execution */
39 #endif
40 #ifndef MOUNT_ATTR_NODIRATIME
41 # define MOUNT_ATTR_NODIRATIME   0x00000080 /* Do not update directory access times */
42 #endif
43 #ifndef MOUNT_ATTR_NOSYMFOLLOW
44 # define MOUNT_ATTR_NOSYMFOLLOW  0x00200000 /* Do not follow symlinks */
45 #endif
46 
47 #ifndef ST_NOSYMFOLLOW
48 # define ST_NOSYMFOLLOW 0x2000 /* do not follow symlinks */
49 #endif
50 
51 #ifndef HAVE_STRUCT_MOUNT_ATTR
52 /*
53  * mount_setattr()
54  */
55 struct mount_attr {
56 	uint64_t attr_set;
57 	uint64_t attr_clr;
58 	uint64_t propagation;
59 	uint64_t userns_fd;
60 };
61 #endif
62 
63 #ifndef HAVE_FSOPEN
fsopen(const char * fsname,unsigned int flags)64 static inline int fsopen(const char *fsname, unsigned int flags)
65 {
66 	return tst_syscall(__NR_fsopen, fsname, flags);
67 }
68 #endif /* HAVE_FSOPEN */
69 
70 #ifndef HAVE_FSCONFIG
fsconfig(int fd,unsigned int cmd,const char * key,const void * value,int aux)71 static inline int fsconfig(int fd, unsigned int cmd, const char *key,
72                            const void *value, int aux)
73 {
74 	return tst_syscall(__NR_fsconfig, fd, cmd, key, value, aux);
75 }
76 #endif /* HAVE_FSCONFIG */
77 
78 #ifndef HAVE_FSMOUNT
fsmount(int fd,unsigned int flags,unsigned int mount_attrs)79 static inline int fsmount(int fd, unsigned int flags, unsigned int mount_attrs)
80 {
81 	return tst_syscall(__NR_fsmount, fd, flags, mount_attrs);
82 }
83 #endif /* HAVE_FSMOUNT */
84 
85 #ifndef HAVE_FSPICK
fspick(int dirfd,const char * pathname,unsigned int flags)86 static inline int fspick(int dirfd, const char *pathname, unsigned int flags)
87 {
88 	return tst_syscall(__NR_fspick, dirfd, pathname, flags);
89 }
90 #endif /* HAVE_FSPICK */
91 
92 #ifndef HAVE_MOVE_MOUNT
move_mount(int from_dirfd,const char * from_pathname,int to_dirfd,const char * to_pathname,unsigned int flags)93 static inline int move_mount(int from_dirfd, const char *from_pathname,
94                              int to_dirfd, const char *to_pathname,
95                              unsigned int flags)
96 {
97 	return tst_syscall(__NR_move_mount, from_dirfd, from_pathname, to_dirfd,
98 			   to_pathname, flags);
99 }
100 #endif /* HAVE_MOVE_MOUNT */
101 
102 #ifndef HAVE_OPEN_TREE
open_tree(int dirfd,const char * pathname,unsigned int flags)103 static inline int open_tree(int dirfd, const char *pathname, unsigned int flags)
104 {
105 	return tst_syscall(__NR_open_tree, dirfd, pathname, flags);
106 }
107 #endif /* HAVE_OPEN_TREE */
108 
109 #ifndef HAVE_MOUNT_SETATTR
mount_setattr(int dirfd,const char * from_pathname,unsigned int flags,struct mount_attr * attr,size_t size)110 static inline int mount_setattr(int dirfd, const char *from_pathname, unsigned int flags,
111 				struct mount_attr *attr, size_t size)
112 {
113 	return tst_syscall(__NR_mount_setattr, dirfd, from_pathname, flags,
114 			   attr, size);
115 }
116 #endif /* HAVE_MOUNT_SETATTR */
117 
118 /*
119  * New headers added in kernel after 5.2 release, create them for old userspace.
120 */
121 
122 #ifndef OPEN_TREE_CLONE
123 
124 /*
125  * open_tree() flags.
126  */
127 #define OPEN_TREE_CLONE		1		/* Clone the target tree and attach the clone */
128 #define OPEN_TREE_CLOEXEC	O_CLOEXEC	/* Close the file on execve() */
129 
130 /*
131  * move_mount() flags.
132  */
133 #define MOVE_MOUNT_F_SYMLINKS		0x00000001 /* Follow symlinks on from path */
134 #define MOVE_MOUNT_F_AUTOMOUNTS		0x00000002 /* Follow automounts on from path */
135 #define MOVE_MOUNT_F_EMPTY_PATH		0x00000004 /* Empty from path permitted */
136 #define MOVE_MOUNT_T_SYMLINKS		0x00000010 /* Follow symlinks on to path */
137 #define MOVE_MOUNT_T_AUTOMOUNTS		0x00000020 /* Follow automounts on to path */
138 #define MOVE_MOUNT_T_EMPTY_PATH		0x00000040 /* Empty to path permitted */
139 #define MOVE_MOUNT__MASK		0x00000077
140 
141 /*
142  * fsopen() flags.
143  */
144 #define FSOPEN_CLOEXEC		0x00000001
145 
146 /*
147  * fspick() flags.
148  */
149 #define FSPICK_CLOEXEC		0x00000001
150 #define FSPICK_SYMLINK_NOFOLLOW	0x00000002
151 #define FSPICK_NO_AUTOMOUNT	0x00000004
152 #define FSPICK_EMPTY_PATH	0x00000008
153 
154 /*
155  * The type of fsconfig() call made.
156  */
157 enum fsconfig_command {
158 	FSCONFIG_SET_FLAG	= 0,	/* Set parameter, supplying no value */
159 	FSCONFIG_SET_STRING	= 1,	/* Set parameter, supplying a string value */
160 	FSCONFIG_SET_BINARY	= 2,	/* Set parameter, supplying a binary blob value */
161 	FSCONFIG_SET_PATH	= 3,	/* Set parameter, supplying an object by path */
162 	FSCONFIG_SET_PATH_EMPTY	= 4,	/* Set parameter, supplying an object by (empty) path */
163 	FSCONFIG_SET_FD		= 5,	/* Set parameter, supplying an object by fd */
164 	FSCONFIG_CMD_CREATE	= 6,	/* Invoke superblock creation */
165 	FSCONFIG_CMD_RECONFIGURE = 7,	/* Invoke superblock reconfiguration */
166 };
167 
168 /*
169  * fsmount() flags.
170  */
171 #define FSMOUNT_CLOEXEC		0x00000001
172 
173 /*
174  * Mount attributes.
175  */
176 #define MOUNT_ATTR_RDONLY	0x00000001 /* Mount read-only */
177 #define MOUNT_ATTR_NOSUID	0x00000002 /* Ignore suid and sgid bits */
178 #define MOUNT_ATTR_NODEV	0x00000004 /* Disallow access to device special files */
179 #define MOUNT_ATTR_NOEXEC	0x00000008 /* Disallow program execution */
180 #define MOUNT_ATTR__ATIME	0x00000070 /* Setting on how atime should be updated */
181 #define MOUNT_ATTR_RELATIME	0x00000000 /* - Update atime relative to mtime/ctime. */
182 #define MOUNT_ATTR_NOATIME	0x00000010 /* - Do not update access times. */
183 #define MOUNT_ATTR_STRICTATIME	0x00000020 /* - Always perform atime updates */
184 #define MOUNT_ATTR_NODIRATIME	0x00000080 /* Do not update directory access times */
185 
186 #endif /* OPEN_TREE_CLONE */
187 
fsopen_supported_by_kernel(void)188 static inline void fsopen_supported_by_kernel(void)
189 {
190 	long ret;
191 
192 	if ((tst_kvercmp(5, 2, 0)) < 0) {
193 		/* Check if the syscall is backported on an older kernel */
194 		ret = syscall(__NR_fsopen, NULL, 0);
195 		if (ret != -1)
196 			SAFE_CLOSE(ret);
197 		else if (errno == ENOSYS)
198 			tst_brk(TCONF, "Test not supported on kernel version < v5.2");
199 	}
200 }
201 
202 #endif /* LAPI_FSMOUNT_H__ */
203