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 LCONVPATHEXIST(td, args->path, &path); 104 105 LINUX_CTR(execve); 106 107 error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp, 108 args->envp); 109 free(path, M_TEMP); 110 if (error == 0) 111 error = linux_common_execve(td, &eargs); 112 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td); 113 return (error); 114 } 115 116 int 117 linux_set_upcall_kse(struct thread *td, register_t stack) 118 { 119 120 if (stack) 121 td->td_frame->tf_rsp = stack; 122 123 /* 124 * The newly created Linux thread returns 125 * to the user space by the same path that a parent do. 126 */ 127 td->td_frame->tf_rax = 0; 128 return (0); 129 } 130 131 int 132 linux_mmap2(struct thread *td, struct linux_mmap2_args *args) 133 { 134 135 return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot, 136 args->flags, args->fd, args->pgoff)); 137 } 138 139 int 140 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 141 { 142 143 return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot)); 144 } 145 146 int 147 linux_iopl(struct thread *td, struct linux_iopl_args *args) 148 { 149 int error; 150 151 LINUX_CTR(iopl); 152 153 if (args->level > 3) 154 return (EINVAL); 155 if ((error = priv_check(td, PRIV_IO)) != 0) 156 return (error); 157 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 158 return (error); 159 td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) | 160 (args->level * (PSL_IOPL / 3)); 161 162 return (0); 163 } 164 165 int 166 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 167 { 168 l_sigset_t lmask; 169 sigset_t sigmask; 170 int error; 171 172 LINUX_CTR2(rt_sigsuspend, "%p, %ld", 173 uap->newset, uap->sigsetsize); 174 175 if (uap->sigsetsize != sizeof(l_sigset_t)) 176 return (EINVAL); 177 178 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); 179 if (error) 180 return (error); 181 182 linux_to_bsd_sigset(&lmask, &sigmask); 183 return (kern_sigsuspend(td, sigmask)); 184 } 185 186 int 187 linux_pause(struct thread *td, struct linux_pause_args *args) 188 { 189 struct proc *p = td->td_proc; 190 sigset_t sigmask; 191 192 LINUX_CTR(pause); 193 194 PROC_LOCK(p); 195 sigmask = td->td_sigmask; 196 PROC_UNLOCK(p); 197 return (kern_sigsuspend(td, sigmask)); 198 } 199 200 int 201 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 202 { 203 stack_t ss, oss; 204 l_stack_t lss; 205 int error; 206 207 memset(&lss, 0, sizeof(lss)); 208 LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss); 209 210 if (uap->uss != NULL) { 211 error = copyin(uap->uss, &lss, sizeof(l_stack_t)); 212 if (error) 213 return (error); 214 215 ss.ss_sp = PTRIN(lss.ss_sp); 216 ss.ss_size = lss.ss_size; 217 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); 218 } 219 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, 220 (uap->uoss != NULL) ? &oss : NULL); 221 if (!error && uap->uoss != NULL) { 222 lss.ss_sp = PTROUT(oss.ss_sp); 223 lss.ss_size = oss.ss_size; 224 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); 225 error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); 226 } 227 228 return (error); 229 } 230 231 int 232 linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args) 233 { 234 struct pcb *pcb; 235 int error; 236 237 pcb = td->td_pcb; 238 LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr); 239 240 switch (args->code) { 241 case LINUX_ARCH_SET_GS: 242 if (args->addr < VM_MAXUSER_ADDRESS) { 243 set_pcb_flags(pcb, PCB_FULL_IRET); 244 pcb->pcb_gsbase = args->addr; 245 td->td_frame->tf_gs = _ugssel; 246 error = 0; 247 } else 248 error = EPERM; 249 break; 250 case LINUX_ARCH_SET_FS: 251 if (args->addr < VM_MAXUSER_ADDRESS) { 252 set_pcb_flags(pcb, PCB_FULL_IRET); 253 pcb->pcb_fsbase = args->addr; 254 td->td_frame->tf_fs = _ufssel; 255 error = 0; 256 } else 257 error = EPERM; 258 break; 259 case LINUX_ARCH_GET_FS: 260 error = copyout(&pcb->pcb_fsbase, PTRIN(args->addr), 261 sizeof(args->addr)); 262 break; 263 case LINUX_ARCH_GET_GS: 264 error = copyout(&pcb->pcb_gsbase, PTRIN(args->addr), 265 sizeof(args->addr)); 266 break; 267 default: 268 error = EINVAL; 269 } 270 return (error); 271 } 272 273 int 274 linux_set_cloned_tls(struct thread *td, void *desc) 275 { 276 struct pcb *pcb; 277 278 if ((uint64_t)desc >= VM_MAXUSER_ADDRESS) 279 return (EPERM); 280 281 pcb = td->td_pcb; 282 pcb->pcb_fsbase = (register_t)desc; 283 td->td_frame->tf_fs = _ufssel; 284 285 return (0); 286 } 287 288 int futex_xchgl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 289 int futex_xchgl_smap(int oparg, uint32_t *uaddr, int *oldval); 290 DEFINE_IFUNC(, int, futex_xchgl, (int, uint32_t *, int *), static) 291 { 292 293 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 294 futex_xchgl_smap : futex_xchgl_nosmap); 295 } 296 297 int futex_addl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 298 int futex_addl_smap(int oparg, uint32_t *uaddr, int *oldval); 299 DEFINE_IFUNC(, int, futex_addl, (int, uint32_t *, int *), static) 300 { 301 302 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 303 futex_addl_smap : futex_addl_nosmap); 304 } 305 306 int futex_orl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 307 int futex_orl_smap(int oparg, uint32_t *uaddr, int *oldval); 308 DEFINE_IFUNC(, int, futex_orl, (int, uint32_t *, int *), static) 309 { 310 311 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 312 futex_orl_smap : futex_orl_nosmap); 313 } 314 315 int futex_andl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 316 int futex_andl_smap(int oparg, uint32_t *uaddr, int *oldval); 317 DEFINE_IFUNC(, int, futex_andl, (int, uint32_t *, int *), static) 318 { 319 320 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 321 futex_andl_smap : futex_andl_nosmap); 322 } 323 324 int futex_xorl_nosmap(int oparg, uint32_t *uaddr, int *oldval); 325 int futex_xorl_smap(int oparg, uint32_t *uaddr, int *oldval); 326 DEFINE_IFUNC(, int, futex_xorl, (int, uint32_t *, int *), static) 327 { 328 329 return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ? 330 futex_xorl_smap : futex_xorl_nosmap); 331 } 332