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("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/capsicum.h> 37 #include <sys/clock.h> 38 #include <sys/dirent.h> 39 #include <sys/fcntl.h> 40 #include <sys/file.h> 41 #include <sys/filedesc.h> 42 #include <sys/imgact.h> 43 #include <sys/kernel.h> 44 #include <sys/ktr.h> 45 #include <sys/limits.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mman.h> 49 #include <sys/mutex.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/resource.h> 53 #include <sys/resourcevar.h> 54 #include <sys/sched.h> 55 #include <sys/syscallsubr.h> 56 #include <sys/sysproto.h> 57 #include <sys/systm.h> 58 #include <sys/unistd.h> 59 #include <sys/vnode.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/pmap.h> 76 #include <vm/vm.h> 77 #include <vm/vm_extern.h> 78 #include <vm/vm_kern.h> 79 #include <vm/vm_map.h> 80 81 #include <x86/ifunc.h> 82 #include <x86/sysarch.h> 83 84 #include <security/audit/audit.h> 85 86 #include <amd64/linux/linux.h> 87 #include <amd64/linux/linux_proto.h> 88 #include <compat/linux/linux_emul.h> 89 #include <compat/linux/linux_file.h> 90 #include <compat/linux/linux_ipc.h> 91 #include <compat/linux/linux_misc.h> 92 #include <compat/linux/linux_mmap.h> 93 #include <compat/linux/linux_signal.h> 94 #include <compat/linux/linux_util.h> 95 96 int 97 linux_execve(struct thread *td, struct linux_execve_args *args) 98 { 99 struct image_args eargs; 100 char *path; 101 int error; 102 103 LINUX_CTR(execve); 104 105 if (!LUSECONVPATH(td)) { 106 error = exec_copyin_args(&eargs, args->path, UIO_USERSPACE, 107 args->argp, args->envp); 108 } else { 109 LCONVPATHEXIST(td, args->path, &path); 110 error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp, 111 args->envp); 112 LFREEPATH(path); 113 } 114 if (error == 0) 115 error = linux_common_execve(td, &eargs); 116 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td); 117 return (error); 118 } 119 120 int 121 linux_set_upcall_kse(struct thread *td, register_t stack) 122 { 123 124 if (stack) 125 td->td_frame->tf_rsp = stack; 126 127 /* 128 * The newly created Linux thread returns 129 * to the user space by the same path that a parent does. 130 */ 131 td->td_frame->tf_rax = 0; 132 return (0); 133 } 134 135 int 136 linux_mmap2(struct thread *td, struct linux_mmap2_args *args) 137 { 138 139 return (linux_mmap_common(td, args->addr, args->len, args->prot, 140 args->flags, args->fd, args->pgoff)); 141 } 142 143 int 144 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 145 { 146 147 return (linux_mprotect_common(td, uap->addr, uap->len, uap->prot)); 148 } 149 150 int 151 linux_madvise(struct thread *td, struct linux_madvise_args *uap) 152 { 153 154 return (linux_madvise_common(td, uap->addr, uap->len, uap->behav)); 155 } 156 157 int 158 linux_iopl(struct thread *td, struct linux_iopl_args *args) 159 { 160 int error; 161 162 LINUX_CTR(iopl); 163 164 if (args->level > 3) 165 return (EINVAL); 166 if ((error = priv_check(td, PRIV_IO)) != 0) 167 return (error); 168 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 169 return (error); 170 td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) | 171 (args->level * (PSL_IOPL / 3)); 172 173 return (0); 174 } 175 176 int 177 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 178 { 179 l_sigset_t lmask; 180 sigset_t sigmask; 181 int error; 182 183 LINUX_CTR2(rt_sigsuspend, "%p, %ld", 184 uap->newset, uap->sigsetsize); 185 186 if (uap->sigsetsize != sizeof(l_sigset_t)) 187 return (EINVAL); 188 189 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); 190 if (error) 191 return (error); 192 193 linux_to_bsd_sigset(&lmask, &sigmask); 194 return (kern_sigsuspend(td, sigmask)); 195 } 196 197 int 198 linux_pause(struct thread *td, struct linux_pause_args *args) 199 { 200 struct proc *p = td->td_proc; 201 sigset_t sigmask; 202 203 LINUX_CTR(pause); 204 205 PROC_LOCK(p); 206 sigmask = td->td_sigmask; 207 PROC_UNLOCK(p); 208 return (kern_sigsuspend(td, sigmask)); 209 } 210 211 int 212 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 213 { 214 stack_t ss, oss; 215 l_stack_t lss; 216 int error; 217 218 memset(&lss, 0, sizeof(lss)); 219 LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss); 220 221 if (uap->uss != NULL) { 222 error = copyin(uap->uss, &lss, sizeof(l_stack_t)); 223 if (error) 224 return (error); 225 226 ss.ss_sp = PTRIN(lss.ss_sp); 227 ss.ss_size = lss.ss_size; 228 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); 229 } 230 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, 231 (uap->uoss != NULL) ? &oss : NULL); 232 if (!error && uap->uoss != NULL) { 233 lss.ss_sp = PTROUT(oss.ss_sp); 234 lss.ss_size = oss.ss_size; 235 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); 236 error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); 237 } 238 239 return (error); 240 } 241 242 int 243 linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args) 244 { 245 struct pcb *pcb; 246 int error; 247 248 pcb = td->td_pcb; 249 LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr); 250 251 switch (args->code) { 252 case LINUX_ARCH_SET_GS: 253 if (args->addr < VM_MAXUSER_ADDRESS) { 254 set_pcb_flags(pcb, PCB_FULL_IRET); 255 pcb->pcb_gsbase = args->addr; 256 td->td_frame->tf_gs = _ugssel; 257 error = 0; 258 } else 259 error = EPERM; 260 break; 261 case LINUX_ARCH_SET_FS: 262 if (args->addr < VM_MAXUSER_ADDRESS) { 263 set_pcb_flags(pcb, PCB_FULL_IRET); 264 pcb->pcb_fsbase = args->addr; 265 td->td_frame->tf_fs = _ufssel; 266 error = 0; 267 } else 268 error = EPERM; 269 break; 270 case LINUX_ARCH_GET_FS: 271 error = copyout(&pcb->pcb_fsbase, PTRIN(args->addr), 272 sizeof(args->addr)); 273 break; 274 case LINUX_ARCH_GET_GS: 275 error = copyout(&pcb->pcb_gsbase, PTRIN(args->addr), 276 sizeof(args->addr)); 277 break; 278 default: 279 error = EINVAL; 280 } 281 return (error); 282 } 283 284 int 285 linux_set_cloned_tls(struct thread *td, void *desc) 286 { 287 struct pcb *pcb; 288 289 if ((uint64_t)desc >= VM_MAXUSER_ADDRESS) 290 return (EPERM); 291 292 pcb = td->td_pcb; 293 pcb->pcb_fsbase = (register_t)desc; 294 td->td_frame->tf_fs = _ufssel; 295 296 return (0); 297 } 298 299 int futex_xchgl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 300 int futex_xchgl_smap(int oparg, uint32_t *uaddr, int *oldval); 301 DEFINE_IFUNC(, int, futex_xchgl, (int, uint32_t *, int *)) 302 { 303 304 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 305 futex_xchgl_smap : futex_xchgl_nosmap); 306 } 307 308 int futex_addl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 309 int futex_addl_smap(int oparg, uint32_t *uaddr, int *oldval); 310 DEFINE_IFUNC(, int, futex_addl, (int, uint32_t *, int *)) 311 { 312 313 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 314 futex_addl_smap : futex_addl_nosmap); 315 } 316 317 int futex_orl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 318 int futex_orl_smap(int oparg, uint32_t *uaddr, int *oldval); 319 DEFINE_IFUNC(, int, futex_orl, (int, uint32_t *, int *)) 320 { 321 322 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 323 futex_orl_smap : futex_orl_nosmap); 324 } 325 326 int futex_andl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 327 int futex_andl_smap(int oparg, uint32_t *uaddr, int *oldval); 328 DEFINE_IFUNC(, int, futex_andl, (int, uint32_t *, int *)) 329 { 330 331 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 332 futex_andl_smap : futex_andl_nosmap); 333 } 334 335 int futex_xorl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 336 int futex_xorl_smap(int oparg, uint32_t *uaddr, int *oldval); 337 DEFINE_IFUNC(, int, futex_xorl, (int, uint32_t *, int *)) 338 { 339 340 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 341 futex_xorl_smap : futex_xorl_nosmap); 342 } 343