linux_machdep.c revision 302964 
1/*-
2 * Copyright (c) 2013 Dmitry Chagin
3 * Copyright (c) 2004 Tim J. Robbins
4 * Copyright (c) 2002 Doug Rabson
5 * Copyright (c) 2000 Marcel Moolenaar
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer
13 *    in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/sys/amd64/linux/linux_machdep.c 302964 2016-07-17 15:23:32Z dchagin $");
34
35#include <sys/param.h>
36#include <sys/kernel.h>
37#include <sys/systm.h>
38#include <sys/capability.h>
39#include <sys/dirent.h>
40#include <sys/file.h>
41#include <sys/fcntl.h>
42#include <sys/filedesc.h>
43#include <sys/clock.h>
44#include <sys/imgact.h>
45#include <sys/ktr.h>
46#include <sys/limits.h>
47#include <sys/lock.h>
48#include <sys/malloc.h>
49#include <sys/mman.h>
50#include <sys/mutex.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/resource.h>
54#include <sys/resourcevar.h>
55#include <sys/sched.h>
56#include <sys/syscallsubr.h>
57#include <sys/sysproto.h>
58#include <sys/vnode.h>
59#include <sys/unistd.h>
60#include <sys/wait.h>
61
62#include <security/mac/mac_framework.h>
63
64#include <ufs/ufs/extattr.h>
65#include <ufs/ufs/quota.h>
66#include <ufs/ufs/ufsmount.h>
67
68#include <machine/frame.h>
69#include <machine/md_var.h>
70#include <machine/pcb.h>
71#include <machine/psl.h>
72#include <machine/segments.h>
73#include <machine/specialreg.h>
74
75#include <vm/vm.h>
76#include <vm/pmap.h>
77#include <vm/vm_extern.h>
78#include <vm/vm_kern.h>
79#include <vm/vm_map.h>
80
81#include <amd64/linux/linux.h>
82#include <amd64/linux/linux_proto.h>
83#include <compat/linux/linux_ipc.h>
84#include <compat/linux/linux_file.h>
85#include <compat/linux/linux_misc.h>
86#include <compat/linux/linux_mmap.h>
87#include <compat/linux/linux_signal.h>
88#include <compat/linux/linux_util.h>
89#include <compat/linux/linux_emul.h>
90
91
92int
93linux_execve(struct thread *td, struct linux_execve_args *args)
94{
95	struct image_args eargs;
96	char *path;
97	int error;
98
99	LCONVPATHEXIST(td, args->path, &path);
100
101	LINUX_CTR(execve);
102
103	error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
104	    args->envp);
105	free(path, M_TEMP);
106	if (error == 0)
107		error = linux_common_execve(td, &eargs);
108	return (error);
109}
110
111int
112linux_set_upcall_kse(struct thread *td, register_t stack)
113{
114
115	if (stack)
116		td->td_frame->tf_rsp = stack;
117
118	/*
119	 * The newly created Linux thread returns
120	 * to the user space by the same path that a parent do.
121	 */
122	td->td_frame->tf_rax = 0;
123	return (0);
124}
125
126int
127linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
128{
129
130	return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
131		args->flags, args->fd, args->pgoff));
132}
133
134int
135linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
136{
137
138	return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot));
139}
140
141int
142linux_iopl(struct thread *td, struct linux_iopl_args *args)
143{
144	int error;
145
146	LINUX_CTR(iopl);
147
148	if (args->level > 3)
149		return (EINVAL);
150	if ((error = priv_check(td, PRIV_IO)) != 0)
151		return (error);
152	if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
153		return (error);
154	td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
155	    (args->level * (PSL_IOPL / 3));
156
157	return (0);
158}
159
160int
161linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
162{
163	l_sigset_t lmask;
164	sigset_t sigmask;
165	int error;
166
167	LINUX_CTR2(rt_sigsuspend, "%p, %ld",
168	    uap->newset, uap->sigsetsize);
169
170	if (uap->sigsetsize != sizeof(l_sigset_t))
171		return (EINVAL);
172
173	error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
174	if (error)
175		return (error);
176
177	linux_to_bsd_sigset(&lmask, &sigmask);
178	return (kern_sigsuspend(td, sigmask));
179}
180
181int
182linux_pause(struct thread *td, struct linux_pause_args *args)
183{
184	struct proc *p = td->td_proc;
185	sigset_t sigmask;
186
187	LINUX_CTR(pause);
188
189	PROC_LOCK(p);
190	sigmask = td->td_sigmask;
191	PROC_UNLOCK(p);
192	return (kern_sigsuspend(td, sigmask));
193}
194
195int
196linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
197{
198	stack_t ss, oss;
199	l_stack_t lss;
200	int error;
201
202	LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss);
203
204	if (uap->uss != NULL) {
205		error = copyin(uap->uss, &lss, sizeof(l_stack_t));
206		if (error)
207			return (error);
208
209		ss.ss_sp = PTRIN(lss.ss_sp);
210		ss.ss_size = lss.ss_size;
211		ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
212	}
213	error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
214	    (uap->uoss != NULL) ? &oss : NULL);
215	if (!error && uap->uoss != NULL) {
216		lss.ss_sp = PTROUT(oss.ss_sp);
217		lss.ss_size = oss.ss_size;
218		lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
219		error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
220	}
221
222	return (error);
223}
224
225int
226linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args)
227{
228	int error;
229	struct pcb *pcb;
230
231	LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr);
232
233	error = ENOTSUP;
234	pcb = td->td_pcb;
235
236	switch (args->code) {
237	case LINUX_ARCH_GET_GS:
238		error = copyout(&pcb->pcb_gsbase, (unsigned long *)args->addr,
239		    sizeof(args->addr));
240		break;
241	case LINUX_ARCH_SET_GS:
242		if (args->addr >= VM_MAXUSER_ADDRESS)
243			return(EPERM);
244		break;
245	case LINUX_ARCH_GET_FS:
246		error = copyout(&pcb->pcb_fsbase, (unsigned long *)args->addr,
247		    sizeof(args->addr));
248		break;
249	case LINUX_ARCH_SET_FS:
250		error = linux_set_cloned_tls(td, (void *)args->addr);
251		break;
252	default:
253		error = EINVAL;
254	}
255	return (error);
256}
257
258int
259linux_set_cloned_tls(struct thread *td, void *desc)
260{
261	struct pcb *pcb;
262
263	if ((uint64_t)desc >= VM_MAXUSER_ADDRESS)
264		return (EPERM);
265
266	pcb = td->td_pcb;
267	pcb->pcb_fsbase = (register_t)desc;
268	td->td_frame->tf_fs = _ufssel;
269
270	return (0);
271}
272