aboutsummaryrefslogtreecommitdiff
path: root/sys/amd64/linux/linux_machdep.c
blob: e44f5c320c3906f02786b73f44fb1e8da30ab539 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
/*-
 * Copyright (c) 2013 Dmitry Chagin
 * Copyright (c) 2004 Tim J. Robbins
 * Copyright (c) 2002 Doug Rabson
 * Copyright (c) 2000 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/clock.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/imgact.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/wait.h>

#include <security/mac/mac_framework.h>

#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>

#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/psl.h>
#include <machine/segments.h>
#include <machine/specialreg.h>

#include <vm/pmap.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>

#include <x86/ifunc.h>
#include <x86/sysarch.h>

#include <security/audit/audit.h>

#include <amd64/linux/linux.h>
#include <amd64/linux/linux_proto.h>
#include <compat/linux/linux_emul.h>
#include <compat/linux/linux_file.h>
#include <compat/linux/linux_ipc.h>
#include <compat/linux/linux_misc.h>
#include <compat/linux/linux_mmap.h>
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_util.h>

int
linux_execve(struct thread *td, struct linux_execve_args *args)
{
	struct image_args eargs;
	char *path;
	int error;

	LINUX_CTR(execve);

	if (!LUSECONVPATH(td)) {
		error = exec_copyin_args(&eargs, args->path, UIO_USERSPACE,
		    args->argp, args->envp);
	} else {
		LCONVPATHEXIST(td, args->path, &path);
		error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
		    args->envp);
		LFREEPATH(path);
	}
	if (error == 0)
		error = linux_common_execve(td, &eargs);
	AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td);
	return (error);
}

int
linux_set_upcall_kse(struct thread *td, register_t stack)
{

	if (stack)
		td->td_frame->tf_rsp = stack;

	/*
	 * The newly created Linux thread returns
	 * to the user space by the same path that a parent does.
	 */
	td->td_frame->tf_rax = 0;
	return (0);
}

int
linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
{

	return (linux_mmap_common(td, args->addr, args->len, args->prot,
		args->flags, args->fd, args->pgoff));
}

int
linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
{

	return (linux_mprotect_common(td, uap->addr, uap->len, uap->prot));
}

int
linux_madvise(struct thread *td, struct linux_madvise_args *uap)
{

	return (linux_madvise_common(td, uap->addr, uap->len, uap->behav));
}

int
linux_iopl(struct thread *td, struct linux_iopl_args *args)
{
	int error;

	LINUX_CTR(iopl);

	if (args->level > 3)
		return (EINVAL);
	if ((error = priv_check(td, PRIV_IO)) != 0)
		return (error);
	if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
		return (error);
	td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
	    (args->level * (PSL_IOPL / 3));

	return (0);
}

int
linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
{
	l_sigset_t lmask;
	sigset_t sigmask;
	int error;

	LINUX_CTR2(rt_sigsuspend, "%p, %ld",
	    uap->newset, uap->sigsetsize);

	if (uap->sigsetsize != sizeof(l_sigset_t))
		return (EINVAL);

	error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
	if (error)
		return (error);

	linux_to_bsd_sigset(&lmask, &sigmask);
	return (kern_sigsuspend(td, sigmask));
}

int
linux_pause(struct thread *td, struct linux_pause_args *args)
{
	struct proc *p = td->td_proc;
	sigset_t sigmask;

	LINUX_CTR(pause);

	PROC_LOCK(p);
	sigmask = td->td_sigmask;
	PROC_UNLOCK(p);
	return (kern_sigsuspend(td, sigmask));
}

int
linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
{
	stack_t ss, oss;
	l_stack_t lss;
	int error;

	memset(&lss, 0, sizeof(lss));
	LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss);

	if (uap->uss != NULL) {
		error = copyin(uap->uss, &lss, sizeof(l_stack_t));
		if (error)
			return (error);

		ss.ss_sp = PTRIN(lss.ss_sp);
		ss.ss_size = lss.ss_size;
		ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
	}
	error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
	    (uap->uoss != NULL) ? &oss : NULL);
	if (!error && uap->uoss != NULL) {
		lss.ss_sp = PTROUT(oss.ss_sp);
		lss.ss_size = oss.ss_size;
		lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
		error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
	}

	return (error);
}

int
linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args)
{
	struct pcb *pcb;
	int error;

	pcb = td->td_pcb;
	LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr);

	switch (args->code) {
	case LINUX_ARCH_SET_GS:
		if (args->addr < VM_MAXUSER_ADDRESS) {
			set_pcb_flags(pcb, PCB_FULL_IRET);
			pcb->pcb_gsbase = args->addr;
			td->td_frame->tf_gs = _ugssel;
			error = 0;
		} else
			error = EPERM;
		break;
	case LINUX_ARCH_SET_FS:
		if (args->addr < VM_MAXUSER_ADDRESS) {
			set_pcb_flags(pcb, PCB_FULL_IRET);
			pcb->pcb_fsbase = args->addr;
			td->td_frame->tf_fs = _ufssel;
			error = 0;
		} else
			error = EPERM;
		break;
	case LINUX_ARCH_GET_FS:
		error = copyout(&pcb->pcb_fsbase, PTRIN(args->addr),
		    sizeof(args->addr));
		break;
	case LINUX_ARCH_GET_GS:
		error = copyout(&pcb->pcb_gsbase, PTRIN(args->addr),
		    sizeof(args->addr));
		break;
	default:
		error = EINVAL;
	}
	return (error);
}

int
linux_set_cloned_tls(struct thread *td, void *desc)
{
	struct pcb *pcb;

	if ((uint64_t)desc >= VM_MAXUSER_ADDRESS)
		return (EPERM);

	pcb = td->td_pcb;
	pcb->pcb_fsbase = (register_t)desc;
	td->td_frame->tf_fs = _ufssel;

	return (0);
}

int futex_xchgl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
int futex_xchgl_smap(int oparg, uint32_t *uaddr, int *oldval);
DEFINE_IFUNC(, int, futex_xchgl, (int, uint32_t *, int *))
{

	return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
	    futex_xchgl_smap : futex_xchgl_nosmap);
}

int futex_addl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
int futex_addl_smap(int oparg, uint32_t *uaddr, int *oldval);
DEFINE_IFUNC(, int, futex_addl, (int, uint32_t *, int *))
{

	return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
	    futex_addl_smap : futex_addl_nosmap);
}

int futex_orl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
int futex_orl_smap(int oparg, uint32_t *uaddr, int *oldval);
DEFINE_IFUNC(, int, futex_orl, (int, uint32_t *, int *))
{

	return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
	    futex_orl_smap : futex_orl_nosmap);
}

int futex_andl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
int futex_andl_smap(int oparg, uint32_t *uaddr, int *oldval);
DEFINE_IFUNC(, int, futex_andl, (int, uint32_t *, int *))
{

	return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
	    futex_andl_smap : futex_andl_nosmap);
}

int futex_xorl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
int futex_xorl_smap(int oparg, uint32_t *uaddr, int *oldval);
DEFINE_IFUNC(, int, futex_xorl, (int, uint32_t *, int *))
{

	return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
	    futex_xorl_smap : futex_xorl_nosmap);
}