s10_brand.c revision 12808:eb600d5471d5
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26#include <sys/errno.h> 27#include <sys/exec.h> 28#include <sys/file.h> 29#include <sys/kmem.h> 30#include <sys/modctl.h> 31#include <sys/model.h> 32#include <sys/proc.h> 33#include <sys/syscall.h> 34#include <sys/systm.h> 35#include <sys/thread.h> 36#include <sys/cmn_err.h> 37#include <sys/archsystm.h> 38#include <sys/pathname.h> 39#include <sys/sunddi.h> 40 41#include <sys/machbrand.h> 42#include <sys/brand.h> 43#include "s10_brand.h" 44 45char *s10_emulation_table = NULL; 46 47void s10_init_brand_data(zone_t *); 48void s10_free_brand_data(zone_t *); 49void s10_setbrand(proc_t *); 50int s10_getattr(zone_t *, int, void *, size_t *); 51int s10_setattr(zone_t *, int, void *, size_t); 52int s10_brandsys(int, int64_t *, uintptr_t, uintptr_t, uintptr_t, 53 uintptr_t, uintptr_t, uintptr_t); 54void s10_copy_procdata(proc_t *, proc_t *); 55void s10_proc_exit(struct proc *, klwp_t *); 56void s10_exec(); 57int s10_initlwp(klwp_t *); 58void s10_forklwp(klwp_t *, klwp_t *); 59void s10_freelwp(klwp_t *); 60void s10_lwpexit(klwp_t *); 61int s10_elfexec(vnode_t *, execa_t *, uarg_t *, intpdata_t *, int, 62 long *, int, caddr_t, cred_t *, int); 63void s10_sigset_native_to_s10(sigset_t *); 64void s10_sigset_s10_to_native(sigset_t *); 65 66/* s10 brand */ 67struct brand_ops s10_brops = { 68 s10_init_brand_data, 69 s10_free_brand_data, 70 s10_brandsys, 71 s10_setbrand, 72 s10_getattr, 73 s10_setattr, 74 s10_copy_procdata, 75 s10_proc_exit, 76 s10_exec, 77 lwp_setrval, 78 s10_initlwp, 79 s10_forklwp, 80 s10_freelwp, 81 s10_lwpexit, 82 s10_elfexec, 83 s10_sigset_native_to_s10, 84 s10_sigset_s10_to_native, 85 S10_NSIG, 86}; 87 88#ifdef sparc 89 90struct brand_mach_ops s10_mops = { 91 s10_brand_syscall_callback, 92 s10_brand_syscall32_callback 93}; 94 95#else /* sparc */ 96 97#ifdef __amd64 98 99struct brand_mach_ops s10_mops = { 100 s10_brand_sysenter_callback, 101 s10_brand_int91_callback, 102 s10_brand_syscall_callback, 103 s10_brand_syscall32_callback 104}; 105 106#else /* ! __amd64 */ 107 108struct brand_mach_ops s10_mops = { 109 s10_brand_sysenter_callback, 110 NULL, 111 s10_brand_syscall_callback, 112 NULL 113}; 114#endif /* __amd64 */ 115 116#endif /* _sparc */ 117 118struct brand s10_brand = { 119 BRAND_VER_1, 120 "solaris10", 121 &s10_brops, 122 &s10_mops 123}; 124 125static struct modlbrand modlbrand = { 126 &mod_brandops, /* type of module */ 127 "Solaris 10 Brand", /* description of module */ 128 &s10_brand /* driver ops */ 129}; 130 131static struct modlinkage modlinkage = { 132 MODREV_1, (void *)&modlbrand, NULL 133}; 134 135void 136s10_setbrand(proc_t *p) 137{ 138 brand_solaris_setbrand(p, &s10_brand); 139} 140 141/*ARGSUSED*/ 142int 143s10_getattr(zone_t *zone, int attr, void *buf, size_t *bufsize) 144{ 145 ASSERT(zone->zone_brand == &s10_brand); 146 if (attr == S10_EMUL_BITMAP) { 147 if (buf == NULL || *bufsize != sizeof (s10_emul_bitmap_t)) 148 return (EINVAL); 149 if (copyout(((s10_zone_data_t *)zone->zone_brand_data)-> 150 emul_bitmap, buf, sizeof (s10_emul_bitmap_t)) != 0) 151 return (EFAULT); 152 return (0); 153 } 154 155 return (EINVAL); 156} 157 158int 159s10_setattr(zone_t *zone, int attr, void *buf, size_t bufsize) 160{ 161 ASSERT(zone->zone_brand == &s10_brand); 162 if (attr == S10_EMUL_BITMAP) { 163 if (buf == NULL || bufsize != sizeof (s10_emul_bitmap_t)) 164 return (EINVAL); 165 if (copyin(buf, ((s10_zone_data_t *)zone->zone_brand_data)-> 166 emul_bitmap, sizeof (s10_emul_bitmap_t)) != 0) 167 return (EFAULT); 168 return (0); 169 } 170 171 return (EINVAL); 172} 173 174#ifdef __amd64 175/* 176 * The Nevada kernel clears %fs for threads in 64-bit x86 processes but S10's 177 * libc expects %fs to be nonzero. This causes some committed 178 * libc/libthread interfaces (e.g., thr_main()) to fail, which impacts several 179 * libraries, including libdoor. This function sets the specified LWP's %fs 180 * register to the legacy S10 selector value (LWPFS_SEL). 181 * 182 * The best solution to the aforementioned problem is backporting CRs 183 * 6467491 to Solaris 10 so that 64-bit x86 Solaris 10 processes 184 * would accept zero for %fs. Backporting the CRs is a requirement for running 185 * S10 Containers in PV domUs because 64-bit Xen clears %fsbase when %fs is 186 * nonzero. Such behavior breaks 64-bit processes because Xen has to fetch the 187 * FS segments' base addresses from the LWPs' GDTs, which are only capable of 188 * 32-bit addressing. 189 */ 190/*ARGSUSED*/ 191static void 192s10_amd64_correct_fsreg(klwp_t *l) 193{ 194 if (lwp_getdatamodel(l) == DATAMODEL_NATIVE) { 195 kpreempt_disable(); 196 l->lwp_pcb.pcb_fs = LWPFS_SEL; 197 l->lwp_pcb.pcb_rupdate = 1; 198 lwptot(l)->t_post_sys = 1; /* Guarantee update_sregs() */ 199 kpreempt_enable(); 200 } 201} 202#endif /* __amd64 */ 203 204/* 205 * Native processes are started with the native ld.so.1 as the command. This 206 * brand op is invoked by s10_npreload to fix up the command and arguments 207 * so that apps like pgrep or ps see the expected command strings. 208 */ 209int 210s10_native(void *cmd, void *args) 211{ 212 struct user *up = PTOU(curproc); 213 char cmd_buf[MAXCOMLEN + 1]; 214 char arg_buf[PSARGSZ]; 215 216 if (copyin(cmd, &cmd_buf, sizeof (cmd_buf)) != 0) 217 return (EFAULT); 218 if (copyin(args, &arg_buf, sizeof (arg_buf)) != 0) 219 return (EFAULT); 220 221 /* 222 * Make sure that the process' interpreter is the native dynamic linker. 223 * Convention dictates that native processes executing within solaris10- 224 * branded zones are interpreted by the native dynamic linker (the 225 * process and its arguments are specified as arguments to the dynamic 226 * linker). If this convention is violated (i.e., 227 * brandsys(B_S10_NATIVE, ...) is invoked by a process that shouldn't be 228 * native), then do nothing and silently indicate success. 229 */ 230 if (strcmp(up->u_comm, S10_LINKER_NAME) != 0) 231 return (0); 232 233 /* 234 * The sizeof has an extra value for the trailing '\0' so this covers 235 * the appended " " in the following strcmps. 236 */ 237 if (strncmp(up->u_psargs, BRAND_NATIVE_LINKER64 " ", 238 sizeof (BRAND_NATIVE_LINKER64)) != 0 && 239 strncmp(up->u_psargs, BRAND_NATIVE_LINKER32 " ", 240 sizeof (BRAND_NATIVE_LINKER32)) != 0) 241 return (0); 242 243 mutex_enter(&curproc->p_lock); 244 (void) strlcpy(up->u_comm, cmd_buf, sizeof (up->u_comm)); 245 (void) strlcpy(up->u_psargs, arg_buf, sizeof (up->u_psargs)); 246 mutex_exit(&curproc->p_lock); 247 248 return (0); 249} 250 251/*ARGSUSED*/ 252int 253s10_brandsys(int cmd, int64_t *rval, uintptr_t arg1, uintptr_t arg2, 254 uintptr_t arg3, uintptr_t arg4, uintptr_t arg5, uintptr_t arg6) 255{ 256 proc_t *p = curproc; 257 int res; 258 259 *rval = 0; 260 261 if (cmd == B_S10_NATIVE) 262 return (s10_native((void *)arg1, (void *)arg2)); 263 264 res = brand_solaris_cmd(cmd, arg1, arg2, arg3, &s10_brand, S10_VERSION); 265 if (res >= 0) 266 return (res); 267 268 switch ((cmd)) { 269 case B_S10_PIDINFO: 270 /* 271 * The s10 brand needs to be able to get the pid of the 272 * current process and the pid of the zone's init, and it 273 * needs to do this on every process startup. Early in 274 * brand startup, we can't call getpid() because calls to 275 * getpid() represent a magical signal to some old-skool 276 * debuggers. By merging all of this into one call, we 277 * make this quite a bit cheaper and easier to handle in 278 * the brand module. 279 */ 280 if (copyout(&p->p_pid, (void *)arg1, sizeof (pid_t)) != 0) 281 return (EFAULT); 282 if (copyout(&p->p_zone->zone_proc_initpid, (void *)arg2, 283 sizeof (pid_t)) != 0) 284 return (EFAULT); 285 return (0); 286 287 case B_S10_ISFDXATTRDIR: { 288 /* 289 * This subcommand enables the userland brand emulation library 290 * to determine whether a file descriptor refers to an extended 291 * file attributes directory. There is no standard syscall or 292 * libc function that can make such a determination. 293 */ 294 file_t *dir_filep; 295 296 dir_filep = getf((int)arg1); 297 if (dir_filep == NULL) 298 return (EBADF); 299 ASSERT(dir_filep->f_vnode != NULL); 300 *rval = IS_XATTRDIR(dir_filep->f_vnode); 301 releasef((int)arg1); 302 return (0); 303 } 304 305#ifdef __amd64 306 case B_S10_FSREGCORRECTION: 307 /* 308 * This subcommand exists so that the SYS_lwp_private and 309 * SYS_lwp_create syscalls can manually set the current thread's 310 * %fs register to the legacy S10 selector value for 64-bit x86 311 * processes. 312 */ 313 s10_amd64_correct_fsreg(ttolwp(curthread)); 314 return (0); 315#endif /* __amd64 */ 316 } 317 318 return (EINVAL); 319} 320 321void 322s10_copy_procdata(proc_t *child, proc_t *parent) 323{ 324 brand_solaris_copy_procdata(child, parent, &s10_brand); 325} 326 327void 328s10_proc_exit(struct proc *p, klwp_t *l) 329{ 330 brand_solaris_proc_exit(p, l, &s10_brand); 331} 332 333void 334s10_exec() 335{ 336 brand_solaris_exec(&s10_brand); 337} 338 339int 340s10_initlwp(klwp_t *l) 341{ 342 return (brand_solaris_initlwp(l, &s10_brand)); 343} 344 345void 346s10_forklwp(klwp_t *p, klwp_t *c) 347{ 348 brand_solaris_forklwp(p, c, &s10_brand); 349 350#ifdef __amd64 351 /* 352 * Only correct the child's %fs register if the parent's %fs register 353 * is LWPFS_SEL. If the parent's %fs register is zero, then the Solaris 354 * 10 environment that we're emulating uses a version of libc that 355 * works when %fs is zero (i.e., it contains backports of CRs 6467491 356 * and 6501650). 357 */ 358 if (p->lwp_pcb.pcb_fs == LWPFS_SEL) 359 s10_amd64_correct_fsreg(c); 360#endif /* __amd64 */ 361} 362 363void 364s10_freelwp(klwp_t *l) 365{ 366 brand_solaris_freelwp(l, &s10_brand); 367} 368 369void 370s10_lwpexit(klwp_t *l) 371{ 372 brand_solaris_lwpexit(l, &s10_brand); 373} 374 375void 376s10_free_brand_data(zone_t *zone) 377{ 378 kmem_free(zone->zone_brand_data, sizeof (s10_zone_data_t)); 379} 380 381void 382s10_init_brand_data(zone_t *zone) 383{ 384 ASSERT(zone->zone_brand == &s10_brand); 385 ASSERT(zone->zone_brand_data == NULL); 386 zone->zone_brand_data = kmem_zalloc(sizeof (s10_zone_data_t), KM_SLEEP); 387} 388 389int 390s10_elfexec(vnode_t *vp, execa_t *uap, uarg_t *args, intpdata_t *idatap, 391 int level, long *execsz, int setid, caddr_t exec_file, cred_t *cred, 392 int brand_action) 393{ 394 return (brand_solaris_elfexec(vp, uap, args, idatap, level, execsz, 395 setid, exec_file, cred, brand_action, &s10_brand, S10_BRANDNAME, 396 S10_LIB, S10_LIB32, S10_LINKER, S10_LINKER32)); 397} 398 399void 400s10_sigset_native_to_s10(sigset_t *set) 401{ 402 int nativesig; 403 int s10sig; 404 sigset_t s10set; 405 406 /* 407 * Shortcut: we know the first 32 signals are the same in both 408 * s10 and native Solaris. Just assign the first word. 409 */ 410 s10set.__sigbits[0] = set->__sigbits[0]; 411 s10set.__sigbits[1] = 0; 412 s10set.__sigbits[2] = 0; 413 s10set.__sigbits[3] = 0; 414 415 /* 416 * Copy the remainder of the initial set of common signals. 417 */ 418 for (nativesig = 33; nativesig < S10_SIGRTMIN; nativesig++) 419 if (sigismember(set, nativesig)) 420 sigaddset(&s10set, nativesig); 421 422 /* 423 * Convert any native RT signals to their S10 values. 424 */ 425 for (nativesig = _SIGRTMIN, s10sig = S10_SIGRTMIN; 426 nativesig <= _SIGRTMAX && s10sig <= S10_SIGRTMAX; 427 nativesig++, s10sig++) { 428 if (sigismember(set, nativesig)) 429 sigaddset(&s10set, s10sig); 430 } 431 432 *set = s10set; 433} 434 435void 436s10_sigset_s10_to_native(sigset_t *set) 437{ 438 int s10sig; 439 int nativesig; 440 sigset_t nativeset; 441 442 /* 443 * Shortcut: we know the first 32 signals are the same in both 444 * s10 and native Solaris. Just assign the first word. 445 */ 446 nativeset.__sigbits[0] = set->__sigbits[0]; 447 nativeset.__sigbits[1] = 0; 448 nativeset.__sigbits[2] = 0; 449 nativeset.__sigbits[3] = 0; 450 451 /* 452 * Copy the remainder of the initial set of common signals. 453 */ 454 for (s10sig = 33; s10sig < S10_SIGRTMIN; s10sig++) 455 if (sigismember(set, s10sig)) 456 sigaddset(&nativeset, s10sig); 457 458 /* 459 * Convert any S10 RT signals to their native values. 460 */ 461 for (s10sig = S10_SIGRTMIN, nativesig = _SIGRTMIN; 462 s10sig <= S10_SIGRTMAX && nativesig <= _SIGRTMAX; 463 s10sig++, nativesig++) { 464 if (sigismember(set, s10sig)) 465 sigaddset(&nativeset, nativesig); 466 } 467 468 *set = nativeset; 469} 470 471int 472_init(void) 473{ 474 int err; 475 476 /* 477 * Set up the table indicating which system calls we want to 478 * interpose on. We should probably build this automatically from 479 * a list of system calls that is shared with the user-space 480 * library. 481 */ 482 s10_emulation_table = kmem_zalloc(NSYSCALL, KM_SLEEP); 483 s10_emulation_table[S10_SYS_forkall] = 1; /* 2 */ 484 s10_emulation_table[S10_SYS_open] = 1; /* 5 */ 485 s10_emulation_table[S10_SYS_wait] = 1; /* 7 */ 486 s10_emulation_table[S10_SYS_creat] = 1; /* 8 */ 487 s10_emulation_table[S10_SYS_link] = 1; /* 9 */ 488 s10_emulation_table[S10_SYS_unlink] = 1; /* 10 */ 489 s10_emulation_table[S10_SYS_exec] = 1; /* 11 */ 490 s10_emulation_table[S10_SYS_mknod] = 1; /* 14 */ 491 s10_emulation_table[S10_SYS_chmod] = 1; /* 15 */ 492 s10_emulation_table[S10_SYS_chown] = 1; /* 16 */ 493 s10_emulation_table[S10_SYS_stat] = 1; /* 18 */ 494 s10_emulation_table[S10_SYS_umount] = 1; /* 22 */ 495 s10_emulation_table[S10_SYS_fstat] = 1; /* 28 */ 496 s10_emulation_table[S10_SYS_utime] = 1; /* 30 */ 497 s10_emulation_table[S10_SYS_access] = 1; /* 33 */ 498 s10_emulation_table[SYS_kill] = 1; /* 37 */ 499 s10_emulation_table[S10_SYS_dup] = 1; /* 41 */ 500 s10_emulation_table[SYS_ioctl] = 1; /* 54 */ 501 s10_emulation_table[SYS_execve] = 1; /* 59 */ 502 s10_emulation_table[SYS_acctctl] = 1; /* 71 */ 503 s10_emulation_table[S10_SYS_issetugid] = 1; /* 75 */ 504 s10_emulation_table[S10_SYS_fsat] = 1; /* 76 */ 505 s10_emulation_table[S10_SYS_rmdir] = 1; /* 79 */ 506 s10_emulation_table[S10_SYS_mkdir] = 1; /* 80 */ 507 s10_emulation_table[SYS_getdents] = 1; /* 81 */ 508 s10_emulation_table[S10_SYS_poll] = 1; /* 87 */ 509 s10_emulation_table[S10_SYS_lstat] = 1; /* 88 */ 510 s10_emulation_table[S10_SYS_symlink] = 1; /* 89 */ 511 s10_emulation_table[S10_SYS_readlink] = 1; /* 90 */ 512 s10_emulation_table[S10_SYS_fchmod] = 1; /* 93 */ 513 s10_emulation_table[S10_SYS_fchown] = 1; /* 94 */ 514 s10_emulation_table[SYS_sigprocmask] = 1; /* 95 */ 515 s10_emulation_table[SYS_sigsuspend] = 1; /* 96 */ 516 s10_emulation_table[SYS_sigaction] = 1; /* 98 */ 517 s10_emulation_table[SYS_sigpending] = 1; /* 99 */ 518 s10_emulation_table[SYS_waitid] = 1; /* 107 */ 519 s10_emulation_table[SYS_sigsendsys] = 1; /* 108 */ 520#if defined(__x86) 521 s10_emulation_table[S10_SYS_xstat] = 1; /* 123 */ 522 s10_emulation_table[S10_SYS_lxstat] = 1; /* 124 */ 523 s10_emulation_table[S10_SYS_fxstat] = 1; /* 125 */ 524 s10_emulation_table[S10_SYS_xmknod] = 1; /* 126 */ 525#endif 526 s10_emulation_table[S10_SYS_lchown] = 1; /* 130 */ 527 s10_emulation_table[S10_SYS_rename] = 1; /* 134 */ 528 s10_emulation_table[SYS_uname] = 1; /* 135 */ 529 s10_emulation_table[SYS_sysconfig] = 1; /* 137 */ 530 s10_emulation_table[SYS_systeminfo] = 1; /* 139 */ 531 s10_emulation_table[S10_SYS_fork1] = 1; /* 143 */ 532 s10_emulation_table[SYS_sigtimedwait] = 1; /* 144 */ 533 s10_emulation_table[S10_SYS_lwp_sema_wait] = 1; /* 147 */ 534 s10_emulation_table[S10_SYS_utimes] = 1; /* 154 */ 535 s10_emulation_table[SYS_lwp_create] = 1; /* 159 */ 536 s10_emulation_table[SYS_lwp_kill] = 1; /* 163 */ 537 s10_emulation_table[SYS_lwp_sigmask] = 1; /* 165 */ 538#if defined(__amd64) 539 s10_emulation_table[SYS_lwp_private] = 1; /* 166 */ 540#endif /* __amd64 */ 541 s10_emulation_table[S10_SYS_lwp_mutex_lock] = 1; /* 169 */ 542 s10_emulation_table[SYS_pwrite] = 1; /* 174 */ 543 s10_emulation_table[SYS_acl] = 1; /* 185 */ 544 s10_emulation_table[SYS_auditsys] = 1; /* 186 */ 545 s10_emulation_table[SYS_sigqueue] = 1; /* 190 */ 546 s10_emulation_table[SYS_facl] = 1; /* 200 */ 547 s10_emulation_table[SYS_signotify] = 1; /* 205 */ 548 s10_emulation_table[SYS_lwp_mutex_timedlock] = 1; /* 210 */ 549 s10_emulation_table[SYS_getdents64] = 1; /* 213 */ 550 s10_emulation_table[S10_SYS_stat64] = 1; /* 215 */ 551 s10_emulation_table[S10_SYS_lstat64] = 1; /* 216 */ 552 s10_emulation_table[S10_SYS_fstat64] = 1; /* 217 */ 553 s10_emulation_table[SYS_pwrite64] = 1; /* 223 */ 554 s10_emulation_table[S10_SYS_creat64] = 1; /* 224 */ 555 s10_emulation_table[S10_SYS_open64] = 1; /* 225 */ 556 s10_emulation_table[SYS_zone] = 1; /* 227 */ 557 s10_emulation_table[SYS_lwp_mutex_trylock] = 1; /* 251 */ 558 559 err = mod_install(&modlinkage); 560 if (err) { 561 cmn_err(CE_WARN, "Couldn't install brand module"); 562 kmem_free(s10_emulation_table, NSYSCALL); 563 } 564 565 return (err); 566} 567 568int 569_info(struct modinfo *modinfop) 570{ 571 return (mod_info(&modlinkage, modinfop)); 572} 573 574int 575_fini(void) 576{ 577 return (brand_solaris_fini(&s10_emulation_table, &modlinkage, 578 &s10_brand)); 579} 580