xref: /netbsd-src/sys/compat/linux32/common/linux32_fcntl.c (revision b32efcfdb0576c6bef7d1e8a419a13acc7d044d1)
1 /*	$NetBSD: linux32_fcntl.c,v 1.11 2021/11/25 02:35:00 ryo Exp $ */
2 
3 /*-
4  * Copyright (c) 2006 Emmanuel Dreyfus, all rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. All advertising materials mentioning features or use of this software
15  *    must display the following acknowledgement:
16  *	This product includes software developed by Emmanuel Dreyfus
17  * 4. The name of the author may not be used to endorse or promote
18  *    products derived from this software without specific prior written
19  *    permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 #include <sys/cdefs.h>
35 
36 __KERNEL_RCSID(0, "$NetBSD: linux32_fcntl.c,v 1.11 2021/11/25 02:35:00 ryo Exp $");
37 
38 #include <sys/types.h>
39 #include <sys/param.h>
40 #include <sys/signal.h>
41 #include <sys/fcntl.h>
42 #include <sys/filedesc.h>
43 
44 #include <machine/types.h>
45 
46 #include <sys/syscallargs.h>
47 
48 #include <compat/netbsd32/netbsd32.h>
49 #include <compat/netbsd32/netbsd32_syscallargs.h>
50 
51 #include <compat/linux/common/linux_types.h>
52 #include <compat/linux/common/linux_fcntl.h>
53 #include <compat/linux/common/linux_machdep.h>
54 #include <compat/linux/common/linux_misc.h>
55 #include <compat/linux/common/linux_ipc.h>
56 #include <compat/linux/common/linux_sem.h>
57 #include <compat/linux/linux_syscallargs.h>
58 
59 #include <compat/linux32/common/linux32_types.h>
60 #include <compat/linux32/common/linux32_fcntl.h>
61 #include <compat/linux32/common/linux32_signal.h>
62 #include <compat/linux32/common/linux32_machdep.h>
63 #include <compat/linux32/linux32_syscall.h>
64 #include <compat/linux32/linux32_syscallargs.h>
65 
66 struct linux32_flock {
67 	short       l_type;
68 	short       l_whence;
69 	int32_t     l_start;
70 	int32_t     l_len;
71 	linux_pid_t l_pid;
72 };
73 
74 struct linux32_flock64 {
75 	short           l_type;
76 	short           l_whence;
77 	netbsd32_int64	l_start;
78 	netbsd32_int64	l_len;
79 	linux_pid_t     l_pid;
80 };
81 
conv_linux_flock(linux32,flock)82 conv_linux_flock(linux32, flock)
83 conv_linux_flock(linux32, flock64)
84 
85 int
86 linux32_sys_open(struct lwp *l, const struct linux32_sys_open_args *uap, register_t *retval)
87 {
88 	/* {
89 		syscallarg(const netbsd32_charp) path;
90 		syscallarg(int) flags;
91 		syscallarg(int) mode;
92 	} */
93 	struct linux_sys_open_args ua;
94 
95 	NETBSD32TOP_UAP(path, const char);
96 	NETBSD32TO64_UAP(flags);
97 	NETBSD32TO64_UAP(mode);
98 
99 	return linux_sys_open(l, &ua, retval);
100 }
101 
102 /*
103  * The linux support for 64bit file offsets introduced both an fcntl64()
104  * function and LINUX_F_SETLK64 (et al), however the fcntl64() function
105  * can still be passed LINUX_F_GETLK (etc).
106  * In practice this means that the two functions are identical!
107  *
108  * We have to intercept both sets of locking primitives because the
109  * structure layout of the 64bit version differs from that on amd64 due
110  * to extra padding because the alignment constraint for int64_t differs.
111  */
112 
113 int
linux32_sys_fcntl(struct lwp * l,const struct linux32_sys_fcntl_args * uap,register_t * retval)114 linux32_sys_fcntl(struct lwp *l, const struct linux32_sys_fcntl_args *uap, register_t *retval)
115 {
116 	/* {
117 		syscallarg(int) fd;
118                 syscallarg(int) cmd;
119 		syscallarg(netbsd32_voidp) arg;
120 	} */
121 	struct linux_sys_fcntl_args ua;
122 	int cmd =  SCARG(uap, cmd);
123 
124 	switch (cmd) {
125 	case LINUX32_F_GETLK64:
126 		do_linux_getlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
127 		    linux32, flock64);
128 	case LINUX32_F_SETLK64:
129 	case LINUX32_F_SETLKW64:
130 		do_linux_setlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
131 		    linux32, flock64, LINUX_F_SETLK64);
132 	case LINUX32_F_GETLK:
133 		do_linux_getlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
134 		    linux32, flock);
135 	case LINUX32_F_SETLK:
136 	case LINUX32_F_SETLKW:
137 		do_linux_setlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
138 		    linux32, flock, LINUX_F_SETLK);
139 	default:
140 		break;
141 	}
142 
143 	NETBSD32TO64_UAP(fd);
144 	SCARG(&ua, cmd) = cmd;
145 	NETBSD32TOP_UAP(arg, void);
146 
147 	return linux_sys_fcntl(l, &ua, retval);
148 }
149 
150 #ifdef LINUX32_SYS_fadvise64
151 int
linux32_sys_fadvise64(struct lwp * l,const struct linux32_sys_fadvise64_args * uap,register_t * retval)152 linux32_sys_fadvise64(struct lwp *l,
153     const struct linux32_sys_fadvise64_args *uap, register_t *retval)
154 {
155 	/* {
156 		syscallarg(int) fd;
157 		syscallarg(uint32_t) offlo;
158 		syscallarg(uint32_t) offhi;
159 		syscallarg(netbsd32_size_t) len;
160 		syscallarg(int) advice;
161 	} */
162 	off_t off = ((off_t)SCARG(uap, offhi) << 32) + SCARG(uap, offlo);
163 
164 	return do_posix_fadvise(SCARG(uap, fd), off,
165 	    SCARG(uap, len), linux_to_bsd_posix_fadv(SCARG(uap, advice)));
166 }
167 #endif
168 
169 int
linux32_sys_fadvise64_64(struct lwp * l,const struct linux32_sys_fadvise64_64_args * uap,register_t * retval)170 linux32_sys_fadvise64_64(struct lwp *l,
171     const struct linux32_sys_fadvise64_64_args *uap, register_t *retval)
172 {
173 	/* {
174 		syscallarg(int) fd;
175 		syscallarg(uint32_t) offlo;
176 		syscallarg(uint32_t) offhi;
177 		syscallarg(uint32_t) lenlo;
178 		syscallarg(uint32_t) lenhi;
179 		syscallarg(int) advice;
180 	} */
181 	off_t off = ((off_t)SCARG(uap, offhi) << 32) + SCARG(uap, offlo);
182 	off_t len = ((off_t)SCARG(uap, lenhi) << 32) + SCARG(uap, lenlo);
183 
184 	return do_posix_fadvise(SCARG(uap, fd), off,
185 	    len, linux_to_bsd_posix_fadv(SCARG(uap, advice)));
186 }
187