34 35#include "opt_compat.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/lock.h> 40#include <sys/mutex.h> 41#include <sys/syscallsubr.h> 42#include <sys/sysent.h> 43#include <sys/sysproto.h> 44#include <sys/proc.h> 45#include <sys/vnode.h> 46#include <sys/ptrace.h> 47#include <sys/rwlock.h> 48#include <sys/sx.h> 49#include <sys/malloc.h> 50#include <sys/signalvar.h> 51 52#include <machine/reg.h> 53 54#include <security/audit/audit.h> 55 56#include <vm/vm.h> 57#include <vm/pmap.h> 58#include <vm/vm_extern.h> 59#include <vm/vm_map.h> 60#include <vm/vm_kern.h> 61#include <vm/vm_object.h> 62#include <vm/vm_page.h> 63#include <vm/vm_param.h> 64 65#ifdef COMPAT_FREEBSD32 66#include <sys/procfs.h> 67#include <compat/freebsd32/freebsd32_signal.h> 68 69struct ptrace_io_desc32 { 70 int piod_op; 71 uint32_t piod_offs; 72 uint32_t piod_addr; 73 uint32_t piod_len; 74}; 75 76struct ptrace_vm_entry32 { 77 int pve_entry; 78 int pve_timestamp; 79 uint32_t pve_start; 80 uint32_t pve_end; 81 uint32_t pve_offset; 82 u_int pve_prot; 83 u_int pve_pathlen; 84 int32_t pve_fileid; 85 u_int pve_fsid; 86 uint32_t pve_path; 87}; 88 89struct ptrace_lwpinfo32 { 90 lwpid_t pl_lwpid; /* LWP described. */ 91 int pl_event; /* Event that stopped the LWP. */ 92 int pl_flags; /* LWP flags. */ 93 sigset_t pl_sigmask; /* LWP signal mask */ 94 sigset_t pl_siglist; /* LWP pending signal */ 95 struct siginfo32 pl_siginfo; /* siginfo for signal */ 96 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */ 97 int pl_child_pid; /* New child pid */ 98}; 99 100#endif 101 102/* 103 * Functions implemented using PROC_ACTION(): 104 * 105 * proc_read_regs(proc, regs) 106 * Get the current user-visible register set from the process 107 * and copy it into the regs structure (<machine/reg.h>). 108 * The process is stopped at the time read_regs is called. 109 * 110 * proc_write_regs(proc, regs) 111 * Update the current register set from the passed in regs 112 * structure. Take care to avoid clobbering special CPU 113 * registers or privileged bits in the PSL. 114 * Depending on the architecture this may have fix-up work to do, 115 * especially if the IAR or PCW are modified. 116 * The process is stopped at the time write_regs is called. 117 * 118 * proc_read_fpregs, proc_write_fpregs 119 * deal with the floating point register set, otherwise as above. 120 * 121 * proc_read_dbregs, proc_write_dbregs 122 * deal with the processor debug register set, otherwise as above. 123 * 124 * proc_sstep(proc) 125 * Arrange for the process to trap after executing a single instruction. 126 */ 127 128#define PROC_ACTION(action) do { \ 129 int error; \ 130 \ 131 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 132 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 133 error = EIO; \ 134 else \ 135 error = (action); \ 136 return (error); \ 137} while(0) 138 139int 140proc_read_regs(struct thread *td, struct reg *regs) 141{ 142 143 PROC_ACTION(fill_regs(td, regs)); 144} 145 146int 147proc_write_regs(struct thread *td, struct reg *regs) 148{ 149 150 PROC_ACTION(set_regs(td, regs)); 151} 152 153int 154proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 155{ 156 157 PROC_ACTION(fill_dbregs(td, dbregs)); 158} 159 160int 161proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 162{ 163 164 PROC_ACTION(set_dbregs(td, dbregs)); 165} 166 167/* 168 * Ptrace doesn't support fpregs at all, and there are no security holes 169 * or translations for fpregs, so we can just copy them. 170 */ 171int 172proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 173{ 174 175 PROC_ACTION(fill_fpregs(td, fpregs)); 176} 177 178int 179proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 180{ 181 182 PROC_ACTION(set_fpregs(td, fpregs)); 183} 184 185#ifdef COMPAT_FREEBSD32 186/* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 187int 188proc_read_regs32(struct thread *td, struct reg32 *regs32) 189{ 190 191 PROC_ACTION(fill_regs32(td, regs32)); 192} 193 194int 195proc_write_regs32(struct thread *td, struct reg32 *regs32) 196{ 197 198 PROC_ACTION(set_regs32(td, regs32)); 199} 200 201int 202proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 203{ 204 205 PROC_ACTION(fill_dbregs32(td, dbregs32)); 206} 207 208int 209proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 210{ 211 212 PROC_ACTION(set_dbregs32(td, dbregs32)); 213} 214 215int 216proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 217{ 218 219 PROC_ACTION(fill_fpregs32(td, fpregs32)); 220} 221 222int 223proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 224{ 225 226 PROC_ACTION(set_fpregs32(td, fpregs32)); 227} 228#endif 229 230int 231proc_sstep(struct thread *td) 232{ 233 234 PROC_ACTION(ptrace_single_step(td)); 235} 236 237int 238proc_rwmem(struct proc *p, struct uio *uio) 239{ 240 vm_map_t map; 241 vm_offset_t pageno; /* page number */ 242 vm_prot_t reqprot; 243 int error, fault_flags, page_offset, writing; 244 245 /* 246 * Assert that someone has locked this vmspace. (Should be 247 * curthread but we can't assert that.) This keeps the process 248 * from exiting out from under us until this operation completes. 249 */ 250 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__, 251 p, p->p_pid)); 252 253 /* 254 * The map we want... 255 */ 256 map = &p->p_vmspace->vm_map; 257 258 /* 259 * If we are writing, then we request vm_fault() to create a private 260 * copy of each page. Since these copies will not be writeable by the 261 * process, we must explicity request that they be dirtied. 262 */ 263 writing = uio->uio_rw == UIO_WRITE; 264 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 265 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
| 34 35#include "opt_compat.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/lock.h> 40#include <sys/mutex.h> 41#include <sys/syscallsubr.h> 42#include <sys/sysent.h> 43#include <sys/sysproto.h> 44#include <sys/proc.h> 45#include <sys/vnode.h> 46#include <sys/ptrace.h> 47#include <sys/rwlock.h> 48#include <sys/sx.h> 49#include <sys/malloc.h> 50#include <sys/signalvar.h> 51 52#include <machine/reg.h> 53 54#include <security/audit/audit.h> 55 56#include <vm/vm.h> 57#include <vm/pmap.h> 58#include <vm/vm_extern.h> 59#include <vm/vm_map.h> 60#include <vm/vm_kern.h> 61#include <vm/vm_object.h> 62#include <vm/vm_page.h> 63#include <vm/vm_param.h> 64 65#ifdef COMPAT_FREEBSD32 66#include <sys/procfs.h> 67#include <compat/freebsd32/freebsd32_signal.h> 68 69struct ptrace_io_desc32 { 70 int piod_op; 71 uint32_t piod_offs; 72 uint32_t piod_addr; 73 uint32_t piod_len; 74}; 75 76struct ptrace_vm_entry32 { 77 int pve_entry; 78 int pve_timestamp; 79 uint32_t pve_start; 80 uint32_t pve_end; 81 uint32_t pve_offset; 82 u_int pve_prot; 83 u_int pve_pathlen; 84 int32_t pve_fileid; 85 u_int pve_fsid; 86 uint32_t pve_path; 87}; 88 89struct ptrace_lwpinfo32 { 90 lwpid_t pl_lwpid; /* LWP described. */ 91 int pl_event; /* Event that stopped the LWP. */ 92 int pl_flags; /* LWP flags. */ 93 sigset_t pl_sigmask; /* LWP signal mask */ 94 sigset_t pl_siglist; /* LWP pending signal */ 95 struct siginfo32 pl_siginfo; /* siginfo for signal */ 96 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */ 97 int pl_child_pid; /* New child pid */ 98}; 99 100#endif 101 102/* 103 * Functions implemented using PROC_ACTION(): 104 * 105 * proc_read_regs(proc, regs) 106 * Get the current user-visible register set from the process 107 * and copy it into the regs structure (<machine/reg.h>). 108 * The process is stopped at the time read_regs is called. 109 * 110 * proc_write_regs(proc, regs) 111 * Update the current register set from the passed in regs 112 * structure. Take care to avoid clobbering special CPU 113 * registers or privileged bits in the PSL. 114 * Depending on the architecture this may have fix-up work to do, 115 * especially if the IAR or PCW are modified. 116 * The process is stopped at the time write_regs is called. 117 * 118 * proc_read_fpregs, proc_write_fpregs 119 * deal with the floating point register set, otherwise as above. 120 * 121 * proc_read_dbregs, proc_write_dbregs 122 * deal with the processor debug register set, otherwise as above. 123 * 124 * proc_sstep(proc) 125 * Arrange for the process to trap after executing a single instruction. 126 */ 127 128#define PROC_ACTION(action) do { \ 129 int error; \ 130 \ 131 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 132 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 133 error = EIO; \ 134 else \ 135 error = (action); \ 136 return (error); \ 137} while(0) 138 139int 140proc_read_regs(struct thread *td, struct reg *regs) 141{ 142 143 PROC_ACTION(fill_regs(td, regs)); 144} 145 146int 147proc_write_regs(struct thread *td, struct reg *regs) 148{ 149 150 PROC_ACTION(set_regs(td, regs)); 151} 152 153int 154proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 155{ 156 157 PROC_ACTION(fill_dbregs(td, dbregs)); 158} 159 160int 161proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 162{ 163 164 PROC_ACTION(set_dbregs(td, dbregs)); 165} 166 167/* 168 * Ptrace doesn't support fpregs at all, and there are no security holes 169 * or translations for fpregs, so we can just copy them. 170 */ 171int 172proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 173{ 174 175 PROC_ACTION(fill_fpregs(td, fpregs)); 176} 177 178int 179proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 180{ 181 182 PROC_ACTION(set_fpregs(td, fpregs)); 183} 184 185#ifdef COMPAT_FREEBSD32 186/* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 187int 188proc_read_regs32(struct thread *td, struct reg32 *regs32) 189{ 190 191 PROC_ACTION(fill_regs32(td, regs32)); 192} 193 194int 195proc_write_regs32(struct thread *td, struct reg32 *regs32) 196{ 197 198 PROC_ACTION(set_regs32(td, regs32)); 199} 200 201int 202proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 203{ 204 205 PROC_ACTION(fill_dbregs32(td, dbregs32)); 206} 207 208int 209proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 210{ 211 212 PROC_ACTION(set_dbregs32(td, dbregs32)); 213} 214 215int 216proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 217{ 218 219 PROC_ACTION(fill_fpregs32(td, fpregs32)); 220} 221 222int 223proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 224{ 225 226 PROC_ACTION(set_fpregs32(td, fpregs32)); 227} 228#endif 229 230int 231proc_sstep(struct thread *td) 232{ 233 234 PROC_ACTION(ptrace_single_step(td)); 235} 236 237int 238proc_rwmem(struct proc *p, struct uio *uio) 239{ 240 vm_map_t map; 241 vm_offset_t pageno; /* page number */ 242 vm_prot_t reqprot; 243 int error, fault_flags, page_offset, writing; 244 245 /* 246 * Assert that someone has locked this vmspace. (Should be 247 * curthread but we can't assert that.) This keeps the process 248 * from exiting out from under us until this operation completes. 249 */ 250 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__, 251 p, p->p_pid)); 252 253 /* 254 * The map we want... 255 */ 256 map = &p->p_vmspace->vm_map; 257 258 /* 259 * If we are writing, then we request vm_fault() to create a private 260 * copy of each page. Since these copies will not be writeable by the 261 * process, we must explicity request that they be dirtied. 262 */ 263 writing = uio->uio_rw == UIO_WRITE; 264 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 265 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
|
322 323 } while (error == 0 && uio->uio_resid > 0); 324 325 return (error); 326} 327 328static int 329ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 330{ 331 struct vattr vattr; 332 vm_map_t map; 333 vm_map_entry_t entry; 334 vm_object_t obj, tobj, lobj; 335 struct vmspace *vm; 336 struct vnode *vp; 337 char *freepath, *fullpath; 338 u_int pathlen; 339 int error, index; 340 341 error = 0; 342 obj = NULL; 343 344 vm = vmspace_acquire_ref(p); 345 map = &vm->vm_map; 346 vm_map_lock_read(map); 347 348 do { 349 entry = map->header.next; 350 index = 0; 351 while (index < pve->pve_entry && entry != &map->header) { 352 entry = entry->next; 353 index++; 354 } 355 if (index != pve->pve_entry) { 356 error = EINVAL; 357 break; 358 } 359 while (entry != &map->header && 360 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 361 entry = entry->next; 362 index++; 363 } 364 if (entry == &map->header) { 365 error = ENOENT; 366 break; 367 } 368 369 /* We got an entry. */ 370 pve->pve_entry = index + 1; 371 pve->pve_timestamp = map->timestamp; 372 pve->pve_start = entry->start; 373 pve->pve_end = entry->end - 1; 374 pve->pve_offset = entry->offset; 375 pve->pve_prot = entry->protection; 376 377 /* Backing object's path needed? */ 378 if (pve->pve_pathlen == 0) 379 break; 380 381 pathlen = pve->pve_pathlen; 382 pve->pve_pathlen = 0; 383 384 obj = entry->object.vm_object; 385 if (obj != NULL) 386 VM_OBJECT_RLOCK(obj); 387 } while (0); 388 389 vm_map_unlock_read(map); 390 vmspace_free(vm); 391 392 pve->pve_fsid = VNOVAL; 393 pve->pve_fileid = VNOVAL; 394 395 if (error == 0 && obj != NULL) { 396 lobj = obj; 397 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 398 if (tobj != obj) 399 VM_OBJECT_RLOCK(tobj); 400 if (lobj != obj) 401 VM_OBJECT_RUNLOCK(lobj); 402 lobj = tobj; 403 pve->pve_offset += tobj->backing_object_offset; 404 } 405 vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL; 406 if (vp != NULL) 407 vref(vp); 408 if (lobj != obj) 409 VM_OBJECT_RUNLOCK(lobj); 410 VM_OBJECT_RUNLOCK(obj); 411 412 if (vp != NULL) { 413 freepath = NULL; 414 fullpath = NULL; 415 vn_fullpath(td, vp, &fullpath, &freepath); 416 vn_lock(vp, LK_SHARED | LK_RETRY); 417 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 418 pve->pve_fileid = vattr.va_fileid; 419 pve->pve_fsid = vattr.va_fsid; 420 } 421 vput(vp); 422 423 if (fullpath != NULL) { 424 pve->pve_pathlen = strlen(fullpath) + 1; 425 if (pve->pve_pathlen <= pathlen) { 426 error = copyout(fullpath, pve->pve_path, 427 pve->pve_pathlen); 428 } else 429 error = ENAMETOOLONG; 430 } 431 if (freepath != NULL) 432 free(freepath, M_TEMP); 433 } 434 } 435 436 return (error); 437} 438 439#ifdef COMPAT_FREEBSD32 440static int 441ptrace_vm_entry32(struct thread *td, struct proc *p, 442 struct ptrace_vm_entry32 *pve32) 443{ 444 struct ptrace_vm_entry pve; 445 int error; 446 447 pve.pve_entry = pve32->pve_entry; 448 pve.pve_pathlen = pve32->pve_pathlen; 449 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 450 451 error = ptrace_vm_entry(td, p, &pve); 452 if (error == 0) { 453 pve32->pve_entry = pve.pve_entry; 454 pve32->pve_timestamp = pve.pve_timestamp; 455 pve32->pve_start = pve.pve_start; 456 pve32->pve_end = pve.pve_end; 457 pve32->pve_offset = pve.pve_offset; 458 pve32->pve_prot = pve.pve_prot; 459 pve32->pve_fileid = pve.pve_fileid; 460 pve32->pve_fsid = pve.pve_fsid; 461 } 462 463 pve32->pve_pathlen = pve.pve_pathlen; 464 return (error); 465} 466 467static void 468ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 469 struct ptrace_lwpinfo32 *pl32) 470{ 471 472 pl32->pl_lwpid = pl->pl_lwpid; 473 pl32->pl_event = pl->pl_event; 474 pl32->pl_flags = pl->pl_flags; 475 pl32->pl_sigmask = pl->pl_sigmask; 476 pl32->pl_siglist = pl->pl_siglist; 477 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 478 strcpy(pl32->pl_tdname, pl->pl_tdname); 479 pl32->pl_child_pid = pl->pl_child_pid; 480} 481#endif /* COMPAT_FREEBSD32 */ 482 483/* 484 * Process debugging system call. 485 */ 486#ifndef _SYS_SYSPROTO_H_ 487struct ptrace_args { 488 int req; 489 pid_t pid; 490 caddr_t addr; 491 int data; 492}; 493#endif 494 495#ifdef COMPAT_FREEBSD32 496/* 497 * This CPP subterfuge is to try and reduce the number of ifdefs in 498 * the body of the code. 499 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 500 * becomes either: 501 * copyin(uap->addr, &r.reg, sizeof r.reg); 502 * or 503 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 504 * .. except this is done at runtime. 505 */ 506#define COPYIN(u, k, s) wrap32 ? \ 507 copyin(u, k ## 32, s ## 32) : \ 508 copyin(u, k, s) 509#define COPYOUT(k, u, s) wrap32 ? \ 510 copyout(k ## 32, u, s ## 32) : \ 511 copyout(k, u, s) 512#else 513#define COPYIN(u, k, s) copyin(u, k, s) 514#define COPYOUT(k, u, s) copyout(k, u, s) 515#endif 516int 517sys_ptrace(struct thread *td, struct ptrace_args *uap) 518{ 519 /* 520 * XXX this obfuscation is to reduce stack usage, but the register 521 * structs may be too large to put on the stack anyway. 522 */ 523 union { 524 struct ptrace_io_desc piod; 525 struct ptrace_lwpinfo pl; 526 struct ptrace_vm_entry pve; 527 struct dbreg dbreg; 528 struct fpreg fpreg; 529 struct reg reg; 530#ifdef COMPAT_FREEBSD32 531 struct dbreg32 dbreg32; 532 struct fpreg32 fpreg32; 533 struct reg32 reg32; 534 struct ptrace_io_desc32 piod32; 535 struct ptrace_lwpinfo32 pl32; 536 struct ptrace_vm_entry32 pve32; 537#endif 538 } r; 539 void *addr; 540 int error = 0; 541#ifdef COMPAT_FREEBSD32 542 int wrap32 = 0; 543 544 if (SV_CURPROC_FLAG(SV_ILP32)) 545 wrap32 = 1; 546#endif 547 AUDIT_ARG_PID(uap->pid); 548 AUDIT_ARG_CMD(uap->req); 549 AUDIT_ARG_VALUE(uap->data); 550 addr = &r; 551 switch (uap->req) { 552 case PT_GETREGS: 553 case PT_GETFPREGS: 554 case PT_GETDBREGS: 555 case PT_LWPINFO: 556 break; 557 case PT_SETREGS: 558 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 559 break; 560 case PT_SETFPREGS: 561 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 562 break; 563 case PT_SETDBREGS: 564 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 565 break; 566 case PT_IO: 567 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 568 break; 569 case PT_VM_ENTRY: 570 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 571 break; 572 default: 573 addr = uap->addr; 574 break; 575 } 576 if (error) 577 return (error); 578 579 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 580 if (error) 581 return (error); 582 583 switch (uap->req) { 584 case PT_VM_ENTRY: 585 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 586 break; 587 case PT_IO: 588 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 589 break; 590 case PT_GETREGS: 591 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 592 break; 593 case PT_GETFPREGS: 594 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 595 break; 596 case PT_GETDBREGS: 597 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 598 break; 599 case PT_LWPINFO: 600 error = copyout(&r.pl, uap->addr, uap->data); 601 break; 602 } 603 604 return (error); 605} 606#undef COPYIN 607#undef COPYOUT 608 609#ifdef COMPAT_FREEBSD32 610/* 611 * PROC_READ(regs, td2, addr); 612 * becomes either: 613 * proc_read_regs(td2, addr); 614 * or 615 * proc_read_regs32(td2, addr); 616 * .. except this is done at runtime. There is an additional 617 * complication in that PROC_WRITE disallows 32 bit consumers 618 * from writing to 64 bit address space targets. 619 */ 620#define PROC_READ(w, t, a) wrap32 ? \ 621 proc_read_ ## w ## 32(t, a) : \ 622 proc_read_ ## w (t, a) 623#define PROC_WRITE(w, t, a) wrap32 ? \ 624 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 625 proc_write_ ## w (t, a) 626#else 627#define PROC_READ(w, t, a) proc_read_ ## w (t, a) 628#define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 629#endif 630 631int 632kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 633{ 634 struct iovec iov; 635 struct uio uio; 636 struct proc *curp, *p, *pp; 637 struct thread *td2 = NULL, *td3; 638 struct ptrace_io_desc *piod = NULL; 639 struct ptrace_lwpinfo *pl; 640 int error, write, tmp, num; 641 int proctree_locked = 0; 642 lwpid_t tid = 0, *buf; 643#ifdef COMPAT_FREEBSD32 644 int wrap32 = 0, safe = 0; 645 struct ptrace_io_desc32 *piod32 = NULL; 646 struct ptrace_lwpinfo32 *pl32 = NULL; 647 struct ptrace_lwpinfo plr; 648#endif 649 650 curp = td->td_proc; 651 652 /* Lock proctree before locking the process. */ 653 switch (req) { 654 case PT_TRACE_ME: 655 case PT_ATTACH: 656 case PT_STEP: 657 case PT_CONTINUE: 658 case PT_TO_SCE: 659 case PT_TO_SCX: 660 case PT_SYSCALL: 661 case PT_FOLLOW_FORK: 662 case PT_DETACH: 663 sx_xlock(&proctree_lock); 664 proctree_locked = 1; 665 break; 666 default: 667 break; 668 } 669 670 write = 0; 671 if (req == PT_TRACE_ME) { 672 p = td->td_proc; 673 PROC_LOCK(p); 674 } else { 675 if (pid <= PID_MAX) { 676 if ((p = pfind(pid)) == NULL) { 677 if (proctree_locked) 678 sx_xunlock(&proctree_lock); 679 return (ESRCH); 680 } 681 } else { 682 td2 = tdfind(pid, -1); 683 if (td2 == NULL) { 684 if (proctree_locked) 685 sx_xunlock(&proctree_lock); 686 return (ESRCH); 687 } 688 p = td2->td_proc; 689 tid = pid; 690 pid = p->p_pid; 691 } 692 } 693 AUDIT_ARG_PROCESS(p); 694 695 if ((p->p_flag & P_WEXIT) != 0) { 696 error = ESRCH; 697 goto fail; 698 } 699 if ((error = p_cansee(td, p)) != 0) 700 goto fail; 701 702 if ((error = p_candebug(td, p)) != 0) 703 goto fail; 704 705 /* 706 * System processes can't be debugged. 707 */ 708 if ((p->p_flag & P_SYSTEM) != 0) { 709 error = EINVAL; 710 goto fail; 711 } 712 713 if (tid == 0) { 714 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 715 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 716 td2 = p->p_xthread; 717 } else { 718 td2 = FIRST_THREAD_IN_PROC(p); 719 } 720 tid = td2->td_tid; 721 } 722 723#ifdef COMPAT_FREEBSD32 724 /* 725 * Test if we're a 32 bit client and what the target is. 726 * Set the wrap controls accordingly. 727 */ 728 if (SV_CURPROC_FLAG(SV_ILP32)) { 729 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 730 safe = 1; 731 wrap32 = 1; 732 } 733#endif 734 /* 735 * Permissions check 736 */ 737 switch (req) { 738 case PT_TRACE_ME: 739 /* Always legal. */ 740 break; 741 742 case PT_ATTACH: 743 /* Self */ 744 if (p->p_pid == td->td_proc->p_pid) { 745 error = EINVAL; 746 goto fail; 747 } 748 749 /* Already traced */ 750 if (p->p_flag & P_TRACED) { 751 error = EBUSY; 752 goto fail; 753 } 754 755 /* Can't trace an ancestor if you're being traced. */ 756 if (curp->p_flag & P_TRACED) { 757 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 758 if (pp == p) { 759 error = EINVAL; 760 goto fail; 761 } 762 } 763 } 764 765 766 /* OK */ 767 break; 768 769 case PT_CLEARSTEP: 770 /* Allow thread to clear single step for itself */ 771 if (td->td_tid == tid) 772 break; 773 774 /* FALLTHROUGH */ 775 default: 776 /* not being traced... */ 777 if ((p->p_flag & P_TRACED) == 0) { 778 error = EPERM; 779 goto fail; 780 } 781 782 /* not being traced by YOU */ 783 if (p->p_pptr != td->td_proc) { 784 error = EBUSY; 785 goto fail; 786 } 787 788 /* not currently stopped */ 789 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 || 790 p->p_suspcount != p->p_numthreads || 791 (p->p_flag & P_WAITED) == 0) { 792 error = EBUSY; 793 goto fail; 794 } 795 796 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 797 static int count = 0; 798 if (count++ == 0) 799 printf("P_STOPPED_TRACE not set.\n"); 800 } 801 802 /* OK */ 803 break; 804 } 805 806 /* Keep this process around until we finish this request. */ 807 _PHOLD(p); 808 809#ifdef FIX_SSTEP 810 /* 811 * Single step fixup ala procfs 812 */ 813 FIX_SSTEP(td2); 814#endif 815 816 /* 817 * Actually do the requests 818 */ 819 820 td->td_retval[0] = 0; 821 822 switch (req) { 823 case PT_TRACE_ME: 824 /* set my trace flag and "owner" so it can read/write me */ 825 p->p_flag |= P_TRACED; 826 if (p->p_flag & P_PPWAIT) 827 p->p_flag |= P_PPTRACE; 828 p->p_oppid = p->p_pptr->p_pid; 829 break; 830 831 case PT_ATTACH: 832 /* security check done above */ 833 /* 834 * It would be nice if the tracing relationship was separate 835 * from the parent relationship but that would require 836 * another set of links in the proc struct or for "wait" 837 * to scan the entire proc table. To make life easier, 838 * we just re-parent the process we're trying to trace. 839 * The old parent is remembered so we can put things back 840 * on a "detach". 841 */ 842 p->p_flag |= P_TRACED; 843 p->p_oppid = p->p_pptr->p_pid; 844 if (p->p_pptr != td->td_proc) { 845 proc_reparent(p, td->td_proc); 846 } 847 data = SIGSTOP; 848 goto sendsig; /* in PT_CONTINUE below */ 849 850 case PT_CLEARSTEP: 851 error = ptrace_clear_single_step(td2); 852 break; 853 854 case PT_SETSTEP: 855 error = ptrace_single_step(td2); 856 break; 857 858 case PT_SUSPEND: 859 td2->td_dbgflags |= TDB_SUSPEND; 860 thread_lock(td2); 861 td2->td_flags |= TDF_NEEDSUSPCHK; 862 thread_unlock(td2); 863 break; 864 865 case PT_RESUME: 866 td2->td_dbgflags &= ~TDB_SUSPEND; 867 break; 868 869 case PT_FOLLOW_FORK: 870 if (data) 871 p->p_flag |= P_FOLLOWFORK; 872 else 873 p->p_flag &= ~P_FOLLOWFORK; 874 break; 875 876 case PT_STEP: 877 case PT_CONTINUE: 878 case PT_TO_SCE: 879 case PT_TO_SCX: 880 case PT_SYSCALL: 881 case PT_DETACH: 882 /* Zero means do not send any signal */ 883 if (data < 0 || data > _SIG_MAXSIG) { 884 error = EINVAL; 885 break; 886 } 887 888 switch (req) { 889 case PT_STEP: 890 error = ptrace_single_step(td2); 891 if (error) 892 goto out; 893 break; 894 case PT_CONTINUE: 895 case PT_TO_SCE: 896 case PT_TO_SCX: 897 case PT_SYSCALL: 898 if (addr != (void *)1) { 899 error = ptrace_set_pc(td2, 900 (u_long)(uintfptr_t)addr); 901 if (error) 902 goto out; 903 } 904 switch (req) { 905 case PT_TO_SCE: 906 p->p_stops |= S_PT_SCE; 907 break; 908 case PT_TO_SCX: 909 p->p_stops |= S_PT_SCX; 910 break; 911 case PT_SYSCALL: 912 p->p_stops |= S_PT_SCE | S_PT_SCX; 913 break; 914 } 915 break; 916 case PT_DETACH: 917 /* reset process parent */ 918 if (p->p_oppid != p->p_pptr->p_pid) { 919 struct proc *pp; 920 921 PROC_LOCK(p->p_pptr); 922 sigqueue_take(p->p_ksi); 923 PROC_UNLOCK(p->p_pptr); 924 925 PROC_UNLOCK(p); 926 pp = pfind(p->p_oppid); 927 if (pp == NULL) 928 pp = initproc; 929 else 930 PROC_UNLOCK(pp); 931 PROC_LOCK(p); 932 proc_reparent(p, pp); 933 if (pp == initproc) 934 p->p_sigparent = SIGCHLD; 935 } 936 p->p_oppid = 0; 937 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK); 938 939 /* should we send SIGCHLD? */ 940 /* childproc_continued(p); */ 941 break; 942 } 943 944 sendsig: 945 if (proctree_locked) { 946 sx_xunlock(&proctree_lock); 947 proctree_locked = 0; 948 } 949 p->p_xstat = data; 950 p->p_xthread = NULL; 951 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 952 /* deliver or queue signal */ 953 td2->td_dbgflags &= ~TDB_XSIG; 954 td2->td_xsig = data; 955 956 if (req == PT_DETACH) { 957 FOREACH_THREAD_IN_PROC(p, td3) 958 td3->td_dbgflags &= ~TDB_SUSPEND; 959 } 960 /* 961 * unsuspend all threads, to not let a thread run, 962 * you should use PT_SUSPEND to suspend it before 963 * continuing process. 964 */ 965 PROC_SLOCK(p); 966 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 967 thread_unsuspend(p); 968 PROC_SUNLOCK(p); 969 if (req == PT_ATTACH) 970 kern_psignal(p, data); 971 } else { 972 if (data) 973 kern_psignal(p, data); 974 } 975 break; 976 977 case PT_WRITE_I: 978 case PT_WRITE_D: 979 td2->td_dbgflags |= TDB_USERWR; 980 write = 1; 981 /* FALLTHROUGH */ 982 case PT_READ_I: 983 case PT_READ_D: 984 PROC_UNLOCK(p); 985 tmp = 0; 986 /* write = 0 set above */ 987 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp; 988 iov.iov_len = sizeof(int); 989 uio.uio_iov = &iov; 990 uio.uio_iovcnt = 1; 991 uio.uio_offset = (off_t)(uintptr_t)addr; 992 uio.uio_resid = sizeof(int); 993 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */ 994 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 995 uio.uio_td = td; 996 error = proc_rwmem(p, &uio); 997 if (uio.uio_resid != 0) { 998 /* 999 * XXX proc_rwmem() doesn't currently return ENOSPC, 1000 * so I think write() can bogusly return 0. 1001 * XXX what happens for short writes? We don't want 1002 * to write partial data. 1003 * XXX proc_rwmem() returns EPERM for other invalid 1004 * addresses. Convert this to EINVAL. Does this 1005 * clobber returns of EPERM for other reasons? 1006 */ 1007 if (error == 0 || error == ENOSPC || error == EPERM) 1008 error = EINVAL; /* EOF */ 1009 } 1010 if (!write) 1011 td->td_retval[0] = tmp; 1012 PROC_LOCK(p); 1013 break; 1014 1015 case PT_IO: 1016#ifdef COMPAT_FREEBSD32 1017 if (wrap32) { 1018 piod32 = addr; 1019 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1020 iov.iov_len = piod32->piod_len; 1021 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1022 uio.uio_resid = piod32->piod_len; 1023 } else 1024#endif 1025 { 1026 piod = addr; 1027 iov.iov_base = piod->piod_addr; 1028 iov.iov_len = piod->piod_len; 1029 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1030 uio.uio_resid = piod->piod_len; 1031 } 1032 uio.uio_iov = &iov; 1033 uio.uio_iovcnt = 1; 1034 uio.uio_segflg = UIO_USERSPACE; 1035 uio.uio_td = td; 1036#ifdef COMPAT_FREEBSD32 1037 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1038#else 1039 tmp = piod->piod_op; 1040#endif 1041 switch (tmp) { 1042 case PIOD_READ_D: 1043 case PIOD_READ_I: 1044 uio.uio_rw = UIO_READ; 1045 break; 1046 case PIOD_WRITE_D: 1047 case PIOD_WRITE_I: 1048 td2->td_dbgflags |= TDB_USERWR; 1049 uio.uio_rw = UIO_WRITE; 1050 break; 1051 default: 1052 error = EINVAL; 1053 goto out; 1054 } 1055 PROC_UNLOCK(p); 1056 error = proc_rwmem(p, &uio); 1057#ifdef COMPAT_FREEBSD32 1058 if (wrap32) 1059 piod32->piod_len -= uio.uio_resid; 1060 else 1061#endif 1062 piod->piod_len -= uio.uio_resid; 1063 PROC_LOCK(p); 1064 break; 1065 1066 case PT_KILL: 1067 data = SIGKILL; 1068 goto sendsig; /* in PT_CONTINUE above */ 1069 1070 case PT_SETREGS: 1071 td2->td_dbgflags |= TDB_USERWR; 1072 error = PROC_WRITE(regs, td2, addr); 1073 break; 1074 1075 case PT_GETREGS: 1076 error = PROC_READ(regs, td2, addr); 1077 break; 1078 1079 case PT_SETFPREGS: 1080 td2->td_dbgflags |= TDB_USERWR; 1081 error = PROC_WRITE(fpregs, td2, addr); 1082 break; 1083 1084 case PT_GETFPREGS: 1085 error = PROC_READ(fpregs, td2, addr); 1086 break; 1087 1088 case PT_SETDBREGS: 1089 td2->td_dbgflags |= TDB_USERWR; 1090 error = PROC_WRITE(dbregs, td2, addr); 1091 break; 1092 1093 case PT_GETDBREGS: 1094 error = PROC_READ(dbregs, td2, addr); 1095 break; 1096 1097 case PT_LWPINFO: 1098 if (data <= 0 || 1099#ifdef COMPAT_FREEBSD32 1100 (!wrap32 && data > sizeof(*pl)) || 1101 (wrap32 && data > sizeof(*pl32))) { 1102#else 1103 data > sizeof(*pl)) { 1104#endif 1105 error = EINVAL; 1106 break; 1107 } 1108#ifdef COMPAT_FREEBSD32 1109 if (wrap32) { 1110 pl = &plr; 1111 pl32 = addr; 1112 } else 1113#endif 1114 pl = addr; 1115 pl->pl_lwpid = td2->td_tid; 1116 pl->pl_event = PL_EVENT_NONE; 1117 pl->pl_flags = 0; 1118 if (td2->td_dbgflags & TDB_XSIG) { 1119 pl->pl_event = PL_EVENT_SIGNAL; 1120 if (td2->td_dbgksi.ksi_signo != 0 && 1121#ifdef COMPAT_FREEBSD32 1122 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1123 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1124 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1125 pl_siginfo) + sizeof(struct siginfo32))) 1126#else 1127 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1128 + sizeof(pl->pl_siginfo) 1129#endif 1130 ){ 1131 pl->pl_flags |= PL_FLAG_SI; 1132 pl->pl_siginfo = td2->td_dbgksi.ksi_info; 1133 } 1134 } 1135 if ((pl->pl_flags & PL_FLAG_SI) == 0) 1136 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo)); 1137 if (td2->td_dbgflags & TDB_SCE) 1138 pl->pl_flags |= PL_FLAG_SCE; 1139 else if (td2->td_dbgflags & TDB_SCX) 1140 pl->pl_flags |= PL_FLAG_SCX; 1141 if (td2->td_dbgflags & TDB_EXEC) 1142 pl->pl_flags |= PL_FLAG_EXEC; 1143 if (td2->td_dbgflags & TDB_FORK) { 1144 pl->pl_flags |= PL_FLAG_FORKED; 1145 pl->pl_child_pid = td2->td_dbg_forked; 1146 } 1147 if (td2->td_dbgflags & TDB_CHILD) 1148 pl->pl_flags |= PL_FLAG_CHILD; 1149 pl->pl_sigmask = td2->td_sigmask; 1150 pl->pl_siglist = td2->td_siglist; 1151 strcpy(pl->pl_tdname, td2->td_name); 1152#ifdef COMPAT_FREEBSD32 1153 if (wrap32) 1154 ptrace_lwpinfo_to32(pl, pl32); 1155#endif 1156 break; 1157 1158 case PT_GETNUMLWPS: 1159 td->td_retval[0] = p->p_numthreads; 1160 break; 1161 1162 case PT_GETLWPLIST: 1163 if (data <= 0) { 1164 error = EINVAL; 1165 break; 1166 } 1167 num = imin(p->p_numthreads, data); 1168 PROC_UNLOCK(p); 1169 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1170 tmp = 0; 1171 PROC_LOCK(p); 1172 FOREACH_THREAD_IN_PROC(p, td2) { 1173 if (tmp >= num) 1174 break; 1175 buf[tmp++] = td2->td_tid; 1176 } 1177 PROC_UNLOCK(p); 1178 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1179 free(buf, M_TEMP); 1180 if (!error) 1181 td->td_retval[0] = tmp; 1182 PROC_LOCK(p); 1183 break; 1184 1185 case PT_VM_TIMESTAMP: 1186 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1187 break; 1188 1189 case PT_VM_ENTRY: 1190 PROC_UNLOCK(p); 1191#ifdef COMPAT_FREEBSD32 1192 if (wrap32) 1193 error = ptrace_vm_entry32(td, p, addr); 1194 else 1195#endif 1196 error = ptrace_vm_entry(td, p, addr); 1197 PROC_LOCK(p); 1198 break; 1199 1200 default: 1201#ifdef __HAVE_PTRACE_MACHDEP 1202 if (req >= PT_FIRSTMACH) { 1203 PROC_UNLOCK(p); 1204 error = cpu_ptrace(td2, req, addr, data); 1205 PROC_LOCK(p); 1206 } else 1207#endif 1208 /* Unknown request. */ 1209 error = EINVAL; 1210 break; 1211 } 1212 1213out: 1214 /* Drop our hold on this process now that the request has completed. */ 1215 _PRELE(p); 1216fail: 1217 PROC_UNLOCK(p); 1218 if (proctree_locked) 1219 sx_xunlock(&proctree_lock); 1220 return (error); 1221} 1222#undef PROC_READ 1223#undef PROC_WRITE 1224 1225/* 1226 * Stop a process because of a debugging event; 1227 * stay stopped until p->p_step is cleared 1228 * (cleared by PIOCCONT in procfs). 1229 */ 1230void 1231stopevent(struct proc *p, unsigned int event, unsigned int val) 1232{ 1233 1234 PROC_LOCK_ASSERT(p, MA_OWNED); 1235 p->p_step = 1; 1236 do { 1237 p->p_xstat = val; 1238 p->p_xthread = NULL; 1239 p->p_stype = event; /* Which event caused the stop? */ 1240 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1241 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1242 } while (p->p_step); 1243}
| 321 322 } while (error == 0 && uio->uio_resid > 0); 323 324 return (error); 325} 326 327static int 328ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 329{ 330 struct vattr vattr; 331 vm_map_t map; 332 vm_map_entry_t entry; 333 vm_object_t obj, tobj, lobj; 334 struct vmspace *vm; 335 struct vnode *vp; 336 char *freepath, *fullpath; 337 u_int pathlen; 338 int error, index; 339 340 error = 0; 341 obj = NULL; 342 343 vm = vmspace_acquire_ref(p); 344 map = &vm->vm_map; 345 vm_map_lock_read(map); 346 347 do { 348 entry = map->header.next; 349 index = 0; 350 while (index < pve->pve_entry && entry != &map->header) { 351 entry = entry->next; 352 index++; 353 } 354 if (index != pve->pve_entry) { 355 error = EINVAL; 356 break; 357 } 358 while (entry != &map->header && 359 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 360 entry = entry->next; 361 index++; 362 } 363 if (entry == &map->header) { 364 error = ENOENT; 365 break; 366 } 367 368 /* We got an entry. */ 369 pve->pve_entry = index + 1; 370 pve->pve_timestamp = map->timestamp; 371 pve->pve_start = entry->start; 372 pve->pve_end = entry->end - 1; 373 pve->pve_offset = entry->offset; 374 pve->pve_prot = entry->protection; 375 376 /* Backing object's path needed? */ 377 if (pve->pve_pathlen == 0) 378 break; 379 380 pathlen = pve->pve_pathlen; 381 pve->pve_pathlen = 0; 382 383 obj = entry->object.vm_object; 384 if (obj != NULL) 385 VM_OBJECT_RLOCK(obj); 386 } while (0); 387 388 vm_map_unlock_read(map); 389 vmspace_free(vm); 390 391 pve->pve_fsid = VNOVAL; 392 pve->pve_fileid = VNOVAL; 393 394 if (error == 0 && obj != NULL) { 395 lobj = obj; 396 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 397 if (tobj != obj) 398 VM_OBJECT_RLOCK(tobj); 399 if (lobj != obj) 400 VM_OBJECT_RUNLOCK(lobj); 401 lobj = tobj; 402 pve->pve_offset += tobj->backing_object_offset; 403 } 404 vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL; 405 if (vp != NULL) 406 vref(vp); 407 if (lobj != obj) 408 VM_OBJECT_RUNLOCK(lobj); 409 VM_OBJECT_RUNLOCK(obj); 410 411 if (vp != NULL) { 412 freepath = NULL; 413 fullpath = NULL; 414 vn_fullpath(td, vp, &fullpath, &freepath); 415 vn_lock(vp, LK_SHARED | LK_RETRY); 416 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 417 pve->pve_fileid = vattr.va_fileid; 418 pve->pve_fsid = vattr.va_fsid; 419 } 420 vput(vp); 421 422 if (fullpath != NULL) { 423 pve->pve_pathlen = strlen(fullpath) + 1; 424 if (pve->pve_pathlen <= pathlen) { 425 error = copyout(fullpath, pve->pve_path, 426 pve->pve_pathlen); 427 } else 428 error = ENAMETOOLONG; 429 } 430 if (freepath != NULL) 431 free(freepath, M_TEMP); 432 } 433 } 434 435 return (error); 436} 437 438#ifdef COMPAT_FREEBSD32 439static int 440ptrace_vm_entry32(struct thread *td, struct proc *p, 441 struct ptrace_vm_entry32 *pve32) 442{ 443 struct ptrace_vm_entry pve; 444 int error; 445 446 pve.pve_entry = pve32->pve_entry; 447 pve.pve_pathlen = pve32->pve_pathlen; 448 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 449 450 error = ptrace_vm_entry(td, p, &pve); 451 if (error == 0) { 452 pve32->pve_entry = pve.pve_entry; 453 pve32->pve_timestamp = pve.pve_timestamp; 454 pve32->pve_start = pve.pve_start; 455 pve32->pve_end = pve.pve_end; 456 pve32->pve_offset = pve.pve_offset; 457 pve32->pve_prot = pve.pve_prot; 458 pve32->pve_fileid = pve.pve_fileid; 459 pve32->pve_fsid = pve.pve_fsid; 460 } 461 462 pve32->pve_pathlen = pve.pve_pathlen; 463 return (error); 464} 465 466static void 467ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 468 struct ptrace_lwpinfo32 *pl32) 469{ 470 471 pl32->pl_lwpid = pl->pl_lwpid; 472 pl32->pl_event = pl->pl_event; 473 pl32->pl_flags = pl->pl_flags; 474 pl32->pl_sigmask = pl->pl_sigmask; 475 pl32->pl_siglist = pl->pl_siglist; 476 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 477 strcpy(pl32->pl_tdname, pl->pl_tdname); 478 pl32->pl_child_pid = pl->pl_child_pid; 479} 480#endif /* COMPAT_FREEBSD32 */ 481 482/* 483 * Process debugging system call. 484 */ 485#ifndef _SYS_SYSPROTO_H_ 486struct ptrace_args { 487 int req; 488 pid_t pid; 489 caddr_t addr; 490 int data; 491}; 492#endif 493 494#ifdef COMPAT_FREEBSD32 495/* 496 * This CPP subterfuge is to try and reduce the number of ifdefs in 497 * the body of the code. 498 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 499 * becomes either: 500 * copyin(uap->addr, &r.reg, sizeof r.reg); 501 * or 502 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 503 * .. except this is done at runtime. 504 */ 505#define COPYIN(u, k, s) wrap32 ? \ 506 copyin(u, k ## 32, s ## 32) : \ 507 copyin(u, k, s) 508#define COPYOUT(k, u, s) wrap32 ? \ 509 copyout(k ## 32, u, s ## 32) : \ 510 copyout(k, u, s) 511#else 512#define COPYIN(u, k, s) copyin(u, k, s) 513#define COPYOUT(k, u, s) copyout(k, u, s) 514#endif 515int 516sys_ptrace(struct thread *td, struct ptrace_args *uap) 517{ 518 /* 519 * XXX this obfuscation is to reduce stack usage, but the register 520 * structs may be too large to put on the stack anyway. 521 */ 522 union { 523 struct ptrace_io_desc piod; 524 struct ptrace_lwpinfo pl; 525 struct ptrace_vm_entry pve; 526 struct dbreg dbreg; 527 struct fpreg fpreg; 528 struct reg reg; 529#ifdef COMPAT_FREEBSD32 530 struct dbreg32 dbreg32; 531 struct fpreg32 fpreg32; 532 struct reg32 reg32; 533 struct ptrace_io_desc32 piod32; 534 struct ptrace_lwpinfo32 pl32; 535 struct ptrace_vm_entry32 pve32; 536#endif 537 } r; 538 void *addr; 539 int error = 0; 540#ifdef COMPAT_FREEBSD32 541 int wrap32 = 0; 542 543 if (SV_CURPROC_FLAG(SV_ILP32)) 544 wrap32 = 1; 545#endif 546 AUDIT_ARG_PID(uap->pid); 547 AUDIT_ARG_CMD(uap->req); 548 AUDIT_ARG_VALUE(uap->data); 549 addr = &r; 550 switch (uap->req) { 551 case PT_GETREGS: 552 case PT_GETFPREGS: 553 case PT_GETDBREGS: 554 case PT_LWPINFO: 555 break; 556 case PT_SETREGS: 557 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 558 break; 559 case PT_SETFPREGS: 560 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 561 break; 562 case PT_SETDBREGS: 563 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 564 break; 565 case PT_IO: 566 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 567 break; 568 case PT_VM_ENTRY: 569 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 570 break; 571 default: 572 addr = uap->addr; 573 break; 574 } 575 if (error) 576 return (error); 577 578 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 579 if (error) 580 return (error); 581 582 switch (uap->req) { 583 case PT_VM_ENTRY: 584 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 585 break; 586 case PT_IO: 587 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 588 break; 589 case PT_GETREGS: 590 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 591 break; 592 case PT_GETFPREGS: 593 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 594 break; 595 case PT_GETDBREGS: 596 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 597 break; 598 case PT_LWPINFO: 599 error = copyout(&r.pl, uap->addr, uap->data); 600 break; 601 } 602 603 return (error); 604} 605#undef COPYIN 606#undef COPYOUT 607 608#ifdef COMPAT_FREEBSD32 609/* 610 * PROC_READ(regs, td2, addr); 611 * becomes either: 612 * proc_read_regs(td2, addr); 613 * or 614 * proc_read_regs32(td2, addr); 615 * .. except this is done at runtime. There is an additional 616 * complication in that PROC_WRITE disallows 32 bit consumers 617 * from writing to 64 bit address space targets. 618 */ 619#define PROC_READ(w, t, a) wrap32 ? \ 620 proc_read_ ## w ## 32(t, a) : \ 621 proc_read_ ## w (t, a) 622#define PROC_WRITE(w, t, a) wrap32 ? \ 623 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 624 proc_write_ ## w (t, a) 625#else 626#define PROC_READ(w, t, a) proc_read_ ## w (t, a) 627#define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 628#endif 629 630int 631kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 632{ 633 struct iovec iov; 634 struct uio uio; 635 struct proc *curp, *p, *pp; 636 struct thread *td2 = NULL, *td3; 637 struct ptrace_io_desc *piod = NULL; 638 struct ptrace_lwpinfo *pl; 639 int error, write, tmp, num; 640 int proctree_locked = 0; 641 lwpid_t tid = 0, *buf; 642#ifdef COMPAT_FREEBSD32 643 int wrap32 = 0, safe = 0; 644 struct ptrace_io_desc32 *piod32 = NULL; 645 struct ptrace_lwpinfo32 *pl32 = NULL; 646 struct ptrace_lwpinfo plr; 647#endif 648 649 curp = td->td_proc; 650 651 /* Lock proctree before locking the process. */ 652 switch (req) { 653 case PT_TRACE_ME: 654 case PT_ATTACH: 655 case PT_STEP: 656 case PT_CONTINUE: 657 case PT_TO_SCE: 658 case PT_TO_SCX: 659 case PT_SYSCALL: 660 case PT_FOLLOW_FORK: 661 case PT_DETACH: 662 sx_xlock(&proctree_lock); 663 proctree_locked = 1; 664 break; 665 default: 666 break; 667 } 668 669 write = 0; 670 if (req == PT_TRACE_ME) { 671 p = td->td_proc; 672 PROC_LOCK(p); 673 } else { 674 if (pid <= PID_MAX) { 675 if ((p = pfind(pid)) == NULL) { 676 if (proctree_locked) 677 sx_xunlock(&proctree_lock); 678 return (ESRCH); 679 } 680 } else { 681 td2 = tdfind(pid, -1); 682 if (td2 == NULL) { 683 if (proctree_locked) 684 sx_xunlock(&proctree_lock); 685 return (ESRCH); 686 } 687 p = td2->td_proc; 688 tid = pid; 689 pid = p->p_pid; 690 } 691 } 692 AUDIT_ARG_PROCESS(p); 693 694 if ((p->p_flag & P_WEXIT) != 0) { 695 error = ESRCH; 696 goto fail; 697 } 698 if ((error = p_cansee(td, p)) != 0) 699 goto fail; 700 701 if ((error = p_candebug(td, p)) != 0) 702 goto fail; 703 704 /* 705 * System processes can't be debugged. 706 */ 707 if ((p->p_flag & P_SYSTEM) != 0) { 708 error = EINVAL; 709 goto fail; 710 } 711 712 if (tid == 0) { 713 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 714 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 715 td2 = p->p_xthread; 716 } else { 717 td2 = FIRST_THREAD_IN_PROC(p); 718 } 719 tid = td2->td_tid; 720 } 721 722#ifdef COMPAT_FREEBSD32 723 /* 724 * Test if we're a 32 bit client and what the target is. 725 * Set the wrap controls accordingly. 726 */ 727 if (SV_CURPROC_FLAG(SV_ILP32)) { 728 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 729 safe = 1; 730 wrap32 = 1; 731 } 732#endif 733 /* 734 * Permissions check 735 */ 736 switch (req) { 737 case PT_TRACE_ME: 738 /* Always legal. */ 739 break; 740 741 case PT_ATTACH: 742 /* Self */ 743 if (p->p_pid == td->td_proc->p_pid) { 744 error = EINVAL; 745 goto fail; 746 } 747 748 /* Already traced */ 749 if (p->p_flag & P_TRACED) { 750 error = EBUSY; 751 goto fail; 752 } 753 754 /* Can't trace an ancestor if you're being traced. */ 755 if (curp->p_flag & P_TRACED) { 756 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 757 if (pp == p) { 758 error = EINVAL; 759 goto fail; 760 } 761 } 762 } 763 764 765 /* OK */ 766 break; 767 768 case PT_CLEARSTEP: 769 /* Allow thread to clear single step for itself */ 770 if (td->td_tid == tid) 771 break; 772 773 /* FALLTHROUGH */ 774 default: 775 /* not being traced... */ 776 if ((p->p_flag & P_TRACED) == 0) { 777 error = EPERM; 778 goto fail; 779 } 780 781 /* not being traced by YOU */ 782 if (p->p_pptr != td->td_proc) { 783 error = EBUSY; 784 goto fail; 785 } 786 787 /* not currently stopped */ 788 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 || 789 p->p_suspcount != p->p_numthreads || 790 (p->p_flag & P_WAITED) == 0) { 791 error = EBUSY; 792 goto fail; 793 } 794 795 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 796 static int count = 0; 797 if (count++ == 0) 798 printf("P_STOPPED_TRACE not set.\n"); 799 } 800 801 /* OK */ 802 break; 803 } 804 805 /* Keep this process around until we finish this request. */ 806 _PHOLD(p); 807 808#ifdef FIX_SSTEP 809 /* 810 * Single step fixup ala procfs 811 */ 812 FIX_SSTEP(td2); 813#endif 814 815 /* 816 * Actually do the requests 817 */ 818 819 td->td_retval[0] = 0; 820 821 switch (req) { 822 case PT_TRACE_ME: 823 /* set my trace flag and "owner" so it can read/write me */ 824 p->p_flag |= P_TRACED; 825 if (p->p_flag & P_PPWAIT) 826 p->p_flag |= P_PPTRACE; 827 p->p_oppid = p->p_pptr->p_pid; 828 break; 829 830 case PT_ATTACH: 831 /* security check done above */ 832 /* 833 * It would be nice if the tracing relationship was separate 834 * from the parent relationship but that would require 835 * another set of links in the proc struct or for "wait" 836 * to scan the entire proc table. To make life easier, 837 * we just re-parent the process we're trying to trace. 838 * The old parent is remembered so we can put things back 839 * on a "detach". 840 */ 841 p->p_flag |= P_TRACED; 842 p->p_oppid = p->p_pptr->p_pid; 843 if (p->p_pptr != td->td_proc) { 844 proc_reparent(p, td->td_proc); 845 } 846 data = SIGSTOP; 847 goto sendsig; /* in PT_CONTINUE below */ 848 849 case PT_CLEARSTEP: 850 error = ptrace_clear_single_step(td2); 851 break; 852 853 case PT_SETSTEP: 854 error = ptrace_single_step(td2); 855 break; 856 857 case PT_SUSPEND: 858 td2->td_dbgflags |= TDB_SUSPEND; 859 thread_lock(td2); 860 td2->td_flags |= TDF_NEEDSUSPCHK; 861 thread_unlock(td2); 862 break; 863 864 case PT_RESUME: 865 td2->td_dbgflags &= ~TDB_SUSPEND; 866 break; 867 868 case PT_FOLLOW_FORK: 869 if (data) 870 p->p_flag |= P_FOLLOWFORK; 871 else 872 p->p_flag &= ~P_FOLLOWFORK; 873 break; 874 875 case PT_STEP: 876 case PT_CONTINUE: 877 case PT_TO_SCE: 878 case PT_TO_SCX: 879 case PT_SYSCALL: 880 case PT_DETACH: 881 /* Zero means do not send any signal */ 882 if (data < 0 || data > _SIG_MAXSIG) { 883 error = EINVAL; 884 break; 885 } 886 887 switch (req) { 888 case PT_STEP: 889 error = ptrace_single_step(td2); 890 if (error) 891 goto out; 892 break; 893 case PT_CONTINUE: 894 case PT_TO_SCE: 895 case PT_TO_SCX: 896 case PT_SYSCALL: 897 if (addr != (void *)1) { 898 error = ptrace_set_pc(td2, 899 (u_long)(uintfptr_t)addr); 900 if (error) 901 goto out; 902 } 903 switch (req) { 904 case PT_TO_SCE: 905 p->p_stops |= S_PT_SCE; 906 break; 907 case PT_TO_SCX: 908 p->p_stops |= S_PT_SCX; 909 break; 910 case PT_SYSCALL: 911 p->p_stops |= S_PT_SCE | S_PT_SCX; 912 break; 913 } 914 break; 915 case PT_DETACH: 916 /* reset process parent */ 917 if (p->p_oppid != p->p_pptr->p_pid) { 918 struct proc *pp; 919 920 PROC_LOCK(p->p_pptr); 921 sigqueue_take(p->p_ksi); 922 PROC_UNLOCK(p->p_pptr); 923 924 PROC_UNLOCK(p); 925 pp = pfind(p->p_oppid); 926 if (pp == NULL) 927 pp = initproc; 928 else 929 PROC_UNLOCK(pp); 930 PROC_LOCK(p); 931 proc_reparent(p, pp); 932 if (pp == initproc) 933 p->p_sigparent = SIGCHLD; 934 } 935 p->p_oppid = 0; 936 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK); 937 938 /* should we send SIGCHLD? */ 939 /* childproc_continued(p); */ 940 break; 941 } 942 943 sendsig: 944 if (proctree_locked) { 945 sx_xunlock(&proctree_lock); 946 proctree_locked = 0; 947 } 948 p->p_xstat = data; 949 p->p_xthread = NULL; 950 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 951 /* deliver or queue signal */ 952 td2->td_dbgflags &= ~TDB_XSIG; 953 td2->td_xsig = data; 954 955 if (req == PT_DETACH) { 956 FOREACH_THREAD_IN_PROC(p, td3) 957 td3->td_dbgflags &= ~TDB_SUSPEND; 958 } 959 /* 960 * unsuspend all threads, to not let a thread run, 961 * you should use PT_SUSPEND to suspend it before 962 * continuing process. 963 */ 964 PROC_SLOCK(p); 965 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 966 thread_unsuspend(p); 967 PROC_SUNLOCK(p); 968 if (req == PT_ATTACH) 969 kern_psignal(p, data); 970 } else { 971 if (data) 972 kern_psignal(p, data); 973 } 974 break; 975 976 case PT_WRITE_I: 977 case PT_WRITE_D: 978 td2->td_dbgflags |= TDB_USERWR; 979 write = 1; 980 /* FALLTHROUGH */ 981 case PT_READ_I: 982 case PT_READ_D: 983 PROC_UNLOCK(p); 984 tmp = 0; 985 /* write = 0 set above */ 986 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp; 987 iov.iov_len = sizeof(int); 988 uio.uio_iov = &iov; 989 uio.uio_iovcnt = 1; 990 uio.uio_offset = (off_t)(uintptr_t)addr; 991 uio.uio_resid = sizeof(int); 992 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */ 993 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 994 uio.uio_td = td; 995 error = proc_rwmem(p, &uio); 996 if (uio.uio_resid != 0) { 997 /* 998 * XXX proc_rwmem() doesn't currently return ENOSPC, 999 * so I think write() can bogusly return 0. 1000 * XXX what happens for short writes? We don't want 1001 * to write partial data. 1002 * XXX proc_rwmem() returns EPERM for other invalid 1003 * addresses. Convert this to EINVAL. Does this 1004 * clobber returns of EPERM for other reasons? 1005 */ 1006 if (error == 0 || error == ENOSPC || error == EPERM) 1007 error = EINVAL; /* EOF */ 1008 } 1009 if (!write) 1010 td->td_retval[0] = tmp; 1011 PROC_LOCK(p); 1012 break; 1013 1014 case PT_IO: 1015#ifdef COMPAT_FREEBSD32 1016 if (wrap32) { 1017 piod32 = addr; 1018 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1019 iov.iov_len = piod32->piod_len; 1020 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1021 uio.uio_resid = piod32->piod_len; 1022 } else 1023#endif 1024 { 1025 piod = addr; 1026 iov.iov_base = piod->piod_addr; 1027 iov.iov_len = piod->piod_len; 1028 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1029 uio.uio_resid = piod->piod_len; 1030 } 1031 uio.uio_iov = &iov; 1032 uio.uio_iovcnt = 1; 1033 uio.uio_segflg = UIO_USERSPACE; 1034 uio.uio_td = td; 1035#ifdef COMPAT_FREEBSD32 1036 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1037#else 1038 tmp = piod->piod_op; 1039#endif 1040 switch (tmp) { 1041 case PIOD_READ_D: 1042 case PIOD_READ_I: 1043 uio.uio_rw = UIO_READ; 1044 break; 1045 case PIOD_WRITE_D: 1046 case PIOD_WRITE_I: 1047 td2->td_dbgflags |= TDB_USERWR; 1048 uio.uio_rw = UIO_WRITE; 1049 break; 1050 default: 1051 error = EINVAL; 1052 goto out; 1053 } 1054 PROC_UNLOCK(p); 1055 error = proc_rwmem(p, &uio); 1056#ifdef COMPAT_FREEBSD32 1057 if (wrap32) 1058 piod32->piod_len -= uio.uio_resid; 1059 else 1060#endif 1061 piod->piod_len -= uio.uio_resid; 1062 PROC_LOCK(p); 1063 break; 1064 1065 case PT_KILL: 1066 data = SIGKILL; 1067 goto sendsig; /* in PT_CONTINUE above */ 1068 1069 case PT_SETREGS: 1070 td2->td_dbgflags |= TDB_USERWR; 1071 error = PROC_WRITE(regs, td2, addr); 1072 break; 1073 1074 case PT_GETREGS: 1075 error = PROC_READ(regs, td2, addr); 1076 break; 1077 1078 case PT_SETFPREGS: 1079 td2->td_dbgflags |= TDB_USERWR; 1080 error = PROC_WRITE(fpregs, td2, addr); 1081 break; 1082 1083 case PT_GETFPREGS: 1084 error = PROC_READ(fpregs, td2, addr); 1085 break; 1086 1087 case PT_SETDBREGS: 1088 td2->td_dbgflags |= TDB_USERWR; 1089 error = PROC_WRITE(dbregs, td2, addr); 1090 break; 1091 1092 case PT_GETDBREGS: 1093 error = PROC_READ(dbregs, td2, addr); 1094 break; 1095 1096 case PT_LWPINFO: 1097 if (data <= 0 || 1098#ifdef COMPAT_FREEBSD32 1099 (!wrap32 && data > sizeof(*pl)) || 1100 (wrap32 && data > sizeof(*pl32))) { 1101#else 1102 data > sizeof(*pl)) { 1103#endif 1104 error = EINVAL; 1105 break; 1106 } 1107#ifdef COMPAT_FREEBSD32 1108 if (wrap32) { 1109 pl = &plr; 1110 pl32 = addr; 1111 } else 1112#endif 1113 pl = addr; 1114 pl->pl_lwpid = td2->td_tid; 1115 pl->pl_event = PL_EVENT_NONE; 1116 pl->pl_flags = 0; 1117 if (td2->td_dbgflags & TDB_XSIG) { 1118 pl->pl_event = PL_EVENT_SIGNAL; 1119 if (td2->td_dbgksi.ksi_signo != 0 && 1120#ifdef COMPAT_FREEBSD32 1121 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1122 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1123 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1124 pl_siginfo) + sizeof(struct siginfo32))) 1125#else 1126 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1127 + sizeof(pl->pl_siginfo) 1128#endif 1129 ){ 1130 pl->pl_flags |= PL_FLAG_SI; 1131 pl->pl_siginfo = td2->td_dbgksi.ksi_info; 1132 } 1133 } 1134 if ((pl->pl_flags & PL_FLAG_SI) == 0) 1135 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo)); 1136 if (td2->td_dbgflags & TDB_SCE) 1137 pl->pl_flags |= PL_FLAG_SCE; 1138 else if (td2->td_dbgflags & TDB_SCX) 1139 pl->pl_flags |= PL_FLAG_SCX; 1140 if (td2->td_dbgflags & TDB_EXEC) 1141 pl->pl_flags |= PL_FLAG_EXEC; 1142 if (td2->td_dbgflags & TDB_FORK) { 1143 pl->pl_flags |= PL_FLAG_FORKED; 1144 pl->pl_child_pid = td2->td_dbg_forked; 1145 } 1146 if (td2->td_dbgflags & TDB_CHILD) 1147 pl->pl_flags |= PL_FLAG_CHILD; 1148 pl->pl_sigmask = td2->td_sigmask; 1149 pl->pl_siglist = td2->td_siglist; 1150 strcpy(pl->pl_tdname, td2->td_name); 1151#ifdef COMPAT_FREEBSD32 1152 if (wrap32) 1153 ptrace_lwpinfo_to32(pl, pl32); 1154#endif 1155 break; 1156 1157 case PT_GETNUMLWPS: 1158 td->td_retval[0] = p->p_numthreads; 1159 break; 1160 1161 case PT_GETLWPLIST: 1162 if (data <= 0) { 1163 error = EINVAL; 1164 break; 1165 } 1166 num = imin(p->p_numthreads, data); 1167 PROC_UNLOCK(p); 1168 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1169 tmp = 0; 1170 PROC_LOCK(p); 1171 FOREACH_THREAD_IN_PROC(p, td2) { 1172 if (tmp >= num) 1173 break; 1174 buf[tmp++] = td2->td_tid; 1175 } 1176 PROC_UNLOCK(p); 1177 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1178 free(buf, M_TEMP); 1179 if (!error) 1180 td->td_retval[0] = tmp; 1181 PROC_LOCK(p); 1182 break; 1183 1184 case PT_VM_TIMESTAMP: 1185 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1186 break; 1187 1188 case PT_VM_ENTRY: 1189 PROC_UNLOCK(p); 1190#ifdef COMPAT_FREEBSD32 1191 if (wrap32) 1192 error = ptrace_vm_entry32(td, p, addr); 1193 else 1194#endif 1195 error = ptrace_vm_entry(td, p, addr); 1196 PROC_LOCK(p); 1197 break; 1198 1199 default: 1200#ifdef __HAVE_PTRACE_MACHDEP 1201 if (req >= PT_FIRSTMACH) { 1202 PROC_UNLOCK(p); 1203 error = cpu_ptrace(td2, req, addr, data); 1204 PROC_LOCK(p); 1205 } else 1206#endif 1207 /* Unknown request. */ 1208 error = EINVAL; 1209 break; 1210 } 1211 1212out: 1213 /* Drop our hold on this process now that the request has completed. */ 1214 _PRELE(p); 1215fail: 1216 PROC_UNLOCK(p); 1217 if (proctree_locked) 1218 sx_xunlock(&proctree_lock); 1219 return (error); 1220} 1221#undef PROC_READ 1222#undef PROC_WRITE 1223 1224/* 1225 * Stop a process because of a debugging event; 1226 * stay stopped until p->p_step is cleared 1227 * (cleared by PIOCCONT in procfs). 1228 */ 1229void 1230stopevent(struct proc *p, unsigned int event, unsigned int val) 1231{ 1232 1233 PROC_LOCK_ASSERT(p, MA_OWNED); 1234 p->p_step = 1; 1235 do { 1236 p->p_xstat = val; 1237 p->p_xthread = NULL; 1238 p->p_stype = event; /* Which event caused the stop? */ 1239 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1240 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1241 } while (p->p_step); 1242}
|