The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_process.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1994, Sean Eric Fagan
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Sean Eric Fagan.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: head/sys/kern/sys_process.c 337330 2018-08-04 20:45:43Z kib $");
   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/pioctl.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/vnode.h>
   48 #include <sys/ptrace.h>
   49 #include <sys/rwlock.h>
   50 #include <sys/sx.h>
   51 #include <sys/malloc.h>
   52 #include <sys/signalvar.h>
   53 
   54 #include <machine/reg.h>
   55 
   56 #include <security/audit/audit.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <vm/vm_extern.h>
   61 #include <vm/vm_map.h>
   62 #include <vm/vm_kern.h>
   63 #include <vm/vm_object.h>
   64 #include <vm/vm_page.h>
   65 #include <vm/vm_param.h>
   66 
   67 #ifdef COMPAT_FREEBSD32
   68 #include <sys/procfs.h>
   69 #include <compat/freebsd32/freebsd32_signal.h>
   70 
   71 struct ptrace_io_desc32 {
   72         int             piod_op;
   73         uint32_t        piod_offs;
   74         uint32_t        piod_addr;
   75         uint32_t        piod_len;
   76 };
   77 
   78 struct ptrace_vm_entry32 {
   79         int             pve_entry;
   80         int             pve_timestamp;
   81         uint32_t        pve_start;
   82         uint32_t        pve_end;
   83         uint32_t        pve_offset;
   84         u_int           pve_prot;
   85         u_int           pve_pathlen;
   86         int32_t         pve_fileid;
   87         u_int           pve_fsid;
   88         uint32_t        pve_path;
   89 };
   90 #endif
   91 
   92 /*
   93  * Functions implemented using PROC_ACTION():
   94  *
   95  * proc_read_regs(proc, regs)
   96  *      Get the current user-visible register set from the process
   97  *      and copy it into the regs structure (<machine/reg.h>).
   98  *      The process is stopped at the time read_regs is called.
   99  *
  100  * proc_write_regs(proc, regs)
  101  *      Update the current register set from the passed in regs
  102  *      structure.  Take care to avoid clobbering special CPU
  103  *      registers or privileged bits in the PSL.
  104  *      Depending on the architecture this may have fix-up work to do,
  105  *      especially if the IAR or PCW are modified.
  106  *      The process is stopped at the time write_regs is called.
  107  *
  108  * proc_read_fpregs, proc_write_fpregs
  109  *      deal with the floating point register set, otherwise as above.
  110  *
  111  * proc_read_dbregs, proc_write_dbregs
  112  *      deal with the processor debug register set, otherwise as above.
  113  *
  114  * proc_sstep(proc)
  115  *      Arrange for the process to trap after executing a single instruction.
  116  */
  117 
  118 #define PROC_ACTION(action) do {                                        \
  119         int error;                                                      \
  120                                                                         \
  121         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);                        \
  122         if ((td->td_proc->p_flag & P_INMEM) == 0)                       \
  123                 error = EIO;                                            \
  124         else                                                            \
  125                 error = (action);                                       \
  126         return (error);                                                 \
  127 } while(0)
  128 
  129 int
  130 proc_read_regs(struct thread *td, struct reg *regs)
  131 {
  132 
  133         PROC_ACTION(fill_regs(td, regs));
  134 }
  135 
  136 int
  137 proc_write_regs(struct thread *td, struct reg *regs)
  138 {
  139 
  140         PROC_ACTION(set_regs(td, regs));
  141 }
  142 
  143 int
  144 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
  145 {
  146 
  147         PROC_ACTION(fill_dbregs(td, dbregs));
  148 }
  149 
  150 int
  151 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
  152 {
  153 
  154         PROC_ACTION(set_dbregs(td, dbregs));
  155 }
  156 
  157 /*
  158  * Ptrace doesn't support fpregs at all, and there are no security holes
  159  * or translations for fpregs, so we can just copy them.
  160  */
  161 int
  162 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
  163 {
  164 
  165         PROC_ACTION(fill_fpregs(td, fpregs));
  166 }
  167 
  168 int
  169 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
  170 {
  171 
  172         PROC_ACTION(set_fpregs(td, fpregs));
  173 }
  174 
  175 #ifdef COMPAT_FREEBSD32
  176 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
  177 int
  178 proc_read_regs32(struct thread *td, struct reg32 *regs32)
  179 {
  180 
  181         PROC_ACTION(fill_regs32(td, regs32));
  182 }
  183 
  184 int
  185 proc_write_regs32(struct thread *td, struct reg32 *regs32)
  186 {
  187 
  188         PROC_ACTION(set_regs32(td, regs32));
  189 }
  190 
  191 int
  192 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  193 {
  194 
  195         PROC_ACTION(fill_dbregs32(td, dbregs32));
  196 }
  197 
  198 int
  199 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  200 {
  201 
  202         PROC_ACTION(set_dbregs32(td, dbregs32));
  203 }
  204 
  205 int
  206 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  207 {
  208 
  209         PROC_ACTION(fill_fpregs32(td, fpregs32));
  210 }
  211 
  212 int
  213 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  214 {
  215 
  216         PROC_ACTION(set_fpregs32(td, fpregs32));
  217 }
  218 #endif
  219 
  220 int
  221 proc_sstep(struct thread *td)
  222 {
  223 
  224         PROC_ACTION(ptrace_single_step(td));
  225 }
  226 
  227 int
  228 proc_rwmem(struct proc *p, struct uio *uio)
  229 {
  230         vm_map_t map;
  231         vm_offset_t pageno;             /* page number */
  232         vm_prot_t reqprot;
  233         int error, fault_flags, page_offset, writing;
  234 
  235         /*
  236          * Assert that someone has locked this vmspace.  (Should be
  237          * curthread but we can't assert that.)  This keeps the process
  238          * from exiting out from under us until this operation completes.
  239          */
  240         PROC_ASSERT_HELD(p);
  241         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  242 
  243         /*
  244          * The map we want...
  245          */
  246         map = &p->p_vmspace->vm_map;
  247 
  248         /*
  249          * If we are writing, then we request vm_fault() to create a private
  250          * copy of each page.  Since these copies will not be writeable by the
  251          * process, we must explicity request that they be dirtied.
  252          */
  253         writing = uio->uio_rw == UIO_WRITE;
  254         reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
  255         fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
  256 
  257         /*
  258          * Only map in one page at a time.  We don't have to, but it
  259          * makes things easier.  This way is trivial - right?
  260          */
  261         do {
  262                 vm_offset_t uva;
  263                 u_int len;
  264                 vm_page_t m;
  265 
  266                 uva = (vm_offset_t)uio->uio_offset;
  267 
  268                 /*
  269                  * Get the page number of this segment.
  270                  */
  271                 pageno = trunc_page(uva);
  272                 page_offset = uva - pageno;
  273 
  274                 /*
  275                  * How many bytes to copy
  276                  */
  277                 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
  278 
  279                 /*
  280                  * Fault and hold the page on behalf of the process.
  281                  */
  282                 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
  283                 if (error != KERN_SUCCESS) {
  284                         if (error == KERN_RESOURCE_SHORTAGE)
  285                                 error = ENOMEM;
  286                         else
  287                                 error = EFAULT;
  288                         break;
  289                 }
  290 
  291                 /*
  292                  * Now do the i/o move.
  293                  */
  294                 error = uiomove_fromphys(&m, page_offset, len, uio);
  295 
  296                 /* Make the I-cache coherent for breakpoints. */
  297                 if (writing && error == 0) {
  298                         vm_map_lock_read(map);
  299                         if (vm_map_check_protection(map, pageno, pageno +
  300                             PAGE_SIZE, VM_PROT_EXECUTE))
  301                                 vm_sync_icache(map, uva, len);
  302                         vm_map_unlock_read(map);
  303                 }
  304 
  305                 /*
  306                  * Release the page.
  307                  */
  308                 vm_page_lock(m);
  309                 vm_page_unhold(m);
  310                 vm_page_unlock(m);
  311 
  312         } while (error == 0 && uio->uio_resid > 0);
  313 
  314         return (error);
  315 }
  316 
  317 static ssize_t
  318 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  319     size_t len, enum uio_rw rw)
  320 {
  321         struct iovec iov;
  322         struct uio uio;
  323         ssize_t slen;
  324 
  325         MPASS(len < SSIZE_MAX);
  326         slen = (ssize_t)len;
  327 
  328         iov.iov_base = (caddr_t)buf;
  329         iov.iov_len = len;
  330         uio.uio_iov = &iov;
  331         uio.uio_iovcnt = 1;
  332         uio.uio_offset = va;
  333         uio.uio_resid = slen;
  334         uio.uio_segflg = UIO_SYSSPACE;
  335         uio.uio_rw = rw;
  336         uio.uio_td = td;
  337         proc_rwmem(p, &uio);
  338         if (uio.uio_resid == slen)
  339                 return (-1);
  340         return (slen - uio.uio_resid);
  341 }
  342 
  343 ssize_t
  344 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  345     size_t len)
  346 {
  347 
  348         return (proc_iop(td, p, va, buf, len, UIO_READ));
  349 }
  350 
  351 ssize_t
  352 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  353     size_t len)
  354 {
  355 
  356         return (proc_iop(td, p, va, buf, len, UIO_WRITE));
  357 }
  358 
  359 static int
  360 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
  361 {
  362         struct vattr vattr;
  363         vm_map_t map;
  364         vm_map_entry_t entry;
  365         vm_object_t obj, tobj, lobj;
  366         struct vmspace *vm;
  367         struct vnode *vp;
  368         char *freepath, *fullpath;
  369         u_int pathlen;
  370         int error, index;
  371 
  372         error = 0;
  373         obj = NULL;
  374 
  375         vm = vmspace_acquire_ref(p);
  376         map = &vm->vm_map;
  377         vm_map_lock_read(map);
  378 
  379         do {
  380                 entry = map->header.next;
  381                 index = 0;
  382                 while (index < pve->pve_entry && entry != &map->header) {
  383                         entry = entry->next;
  384                         index++;
  385                 }
  386                 if (index != pve->pve_entry) {
  387                         error = EINVAL;
  388                         break;
  389                 }
  390                 while (entry != &map->header &&
  391                     (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
  392                         entry = entry->next;
  393                         index++;
  394                 }
  395                 if (entry == &map->header) {
  396                         error = ENOENT;
  397                         break;
  398                 }
  399 
  400                 /* We got an entry. */
  401                 pve->pve_entry = index + 1;
  402                 pve->pve_timestamp = map->timestamp;
  403                 pve->pve_start = entry->start;
  404                 pve->pve_end = entry->end - 1;
  405                 pve->pve_offset = entry->offset;
  406                 pve->pve_prot = entry->protection;
  407 
  408                 /* Backing object's path needed? */
  409                 if (pve->pve_pathlen == 0)
  410                         break;
  411 
  412                 pathlen = pve->pve_pathlen;
  413                 pve->pve_pathlen = 0;
  414 
  415                 obj = entry->object.vm_object;
  416                 if (obj != NULL)
  417                         VM_OBJECT_RLOCK(obj);
  418         } while (0);
  419 
  420         vm_map_unlock_read(map);
  421 
  422         pve->pve_fsid = VNOVAL;
  423         pve->pve_fileid = VNOVAL;
  424 
  425         if (error == 0 && obj != NULL) {
  426                 lobj = obj;
  427                 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
  428                         if (tobj != obj)
  429                                 VM_OBJECT_RLOCK(tobj);
  430                         if (lobj != obj)
  431                                 VM_OBJECT_RUNLOCK(lobj);
  432                         lobj = tobj;
  433                         pve->pve_offset += tobj->backing_object_offset;
  434                 }
  435                 vp = vm_object_vnode(lobj);
  436                 if (vp != NULL)
  437                         vref(vp);
  438                 if (lobj != obj)
  439                         VM_OBJECT_RUNLOCK(lobj);
  440                 VM_OBJECT_RUNLOCK(obj);
  441 
  442                 if (vp != NULL) {
  443                         freepath = NULL;
  444                         fullpath = NULL;
  445                         vn_fullpath(td, vp, &fullpath, &freepath);
  446                         vn_lock(vp, LK_SHARED | LK_RETRY);
  447                         if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
  448                                 pve->pve_fileid = vattr.va_fileid;
  449                                 pve->pve_fsid = vattr.va_fsid;
  450                         }
  451                         vput(vp);
  452 
  453                         if (fullpath != NULL) {
  454                                 pve->pve_pathlen = strlen(fullpath) + 1;
  455                                 if (pve->pve_pathlen <= pathlen) {
  456                                         error = copyout(fullpath, pve->pve_path,
  457                                             pve->pve_pathlen);
  458                                 } else
  459                                         error = ENAMETOOLONG;
  460                         }
  461                         if (freepath != NULL)
  462                                 free(freepath, M_TEMP);
  463                 }
  464         }
  465         vmspace_free(vm);
  466         if (error == 0)
  467                 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
  468                     p->p_pid, pve->pve_entry, pve->pve_start);
  469 
  470         return (error);
  471 }
  472 
  473 #ifdef COMPAT_FREEBSD32
  474 static int
  475 ptrace_vm_entry32(struct thread *td, struct proc *p,
  476     struct ptrace_vm_entry32 *pve32)
  477 {
  478         struct ptrace_vm_entry pve;
  479         int error;
  480 
  481         pve.pve_entry = pve32->pve_entry;
  482         pve.pve_pathlen = pve32->pve_pathlen;
  483         pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
  484 
  485         error = ptrace_vm_entry(td, p, &pve);
  486         if (error == 0) {
  487                 pve32->pve_entry = pve.pve_entry;
  488                 pve32->pve_timestamp = pve.pve_timestamp;
  489                 pve32->pve_start = pve.pve_start;
  490                 pve32->pve_end = pve.pve_end;
  491                 pve32->pve_offset = pve.pve_offset;
  492                 pve32->pve_prot = pve.pve_prot;
  493                 pve32->pve_fileid = pve.pve_fileid;
  494                 pve32->pve_fsid = pve.pve_fsid;
  495         }
  496 
  497         pve32->pve_pathlen = pve.pve_pathlen;
  498         return (error);
  499 }
  500 
  501 static void
  502 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
  503     struct ptrace_lwpinfo32 *pl32)
  504 {
  505 
  506         bzero(pl32, sizeof(*pl32));
  507         pl32->pl_lwpid = pl->pl_lwpid;
  508         pl32->pl_event = pl->pl_event;
  509         pl32->pl_flags = pl->pl_flags;
  510         pl32->pl_sigmask = pl->pl_sigmask;
  511         pl32->pl_siglist = pl->pl_siglist;
  512         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
  513         strcpy(pl32->pl_tdname, pl->pl_tdname);
  514         pl32->pl_child_pid = pl->pl_child_pid;
  515         pl32->pl_syscall_code = pl->pl_syscall_code;
  516         pl32->pl_syscall_narg = pl->pl_syscall_narg;
  517 }
  518 #endif /* COMPAT_FREEBSD32 */
  519 
  520 /*
  521  * Process debugging system call.
  522  */
  523 #ifndef _SYS_SYSPROTO_H_
  524 struct ptrace_args {
  525         int     req;
  526         pid_t   pid;
  527         caddr_t addr;
  528         int     data;
  529 };
  530 #endif
  531 
  532 #ifdef COMPAT_FREEBSD32
  533 /*
  534  * This CPP subterfuge is to try and reduce the number of ifdefs in
  535  * the body of the code.
  536  *   COPYIN(uap->addr, &r.reg, sizeof r.reg);
  537  * becomes either:
  538  *   copyin(uap->addr, &r.reg, sizeof r.reg);
  539  * or
  540  *   copyin(uap->addr, &r.reg32, sizeof r.reg32);
  541  * .. except this is done at runtime.
  542  */
  543 #define COPYIN(u, k, s)         wrap32 ? \
  544         copyin(u, k ## 32, s ## 32) : \
  545         copyin(u, k, s)
  546 #define COPYOUT(k, u, s)        wrap32 ? \
  547         copyout(k ## 32, u, s ## 32) : \
  548         copyout(k, u, s)
  549 #else
  550 #define COPYIN(u, k, s)         copyin(u, k, s)
  551 #define COPYOUT(k, u, s)        copyout(k, u, s)
  552 #endif
  553 int
  554 sys_ptrace(struct thread *td, struct ptrace_args *uap)
  555 {
  556         /*
  557          * XXX this obfuscation is to reduce stack usage, but the register
  558          * structs may be too large to put on the stack anyway.
  559          */
  560         union {
  561                 struct ptrace_io_desc piod;
  562                 struct ptrace_lwpinfo pl;
  563                 struct ptrace_vm_entry pve;
  564                 struct dbreg dbreg;
  565                 struct fpreg fpreg;
  566                 struct reg reg;
  567 #ifdef COMPAT_FREEBSD32
  568                 struct dbreg32 dbreg32;
  569                 struct fpreg32 fpreg32;
  570                 struct reg32 reg32;
  571                 struct ptrace_io_desc32 piod32;
  572                 struct ptrace_lwpinfo32 pl32;
  573                 struct ptrace_vm_entry32 pve32;
  574 #endif
  575                 char args[nitems(td->td_sa.args) * sizeof(register_t)];
  576                 int ptevents;
  577         } r;
  578         void *addr;
  579         int error = 0;
  580 #ifdef COMPAT_FREEBSD32
  581         int wrap32 = 0;
  582 
  583         if (SV_CURPROC_FLAG(SV_ILP32))
  584                 wrap32 = 1;
  585 #endif
  586         AUDIT_ARG_PID(uap->pid);
  587         AUDIT_ARG_CMD(uap->req);
  588         AUDIT_ARG_VALUE(uap->data);
  589         addr = &r;
  590         switch (uap->req) {
  591         case PT_GET_EVENT_MASK:
  592         case PT_GETREGS:
  593         case PT_GETFPREGS:
  594         case PT_GETDBREGS:
  595         case PT_LWPINFO:
  596         case PT_GET_SC_ARGS:
  597                 break;
  598         case PT_SETREGS:
  599                 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
  600                 break;
  601         case PT_SETFPREGS:
  602                 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
  603                 break;
  604         case PT_SETDBREGS:
  605                 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
  606                 break;
  607         case PT_SET_EVENT_MASK:
  608                 if (uap->data != sizeof(r.ptevents))
  609                         error = EINVAL;
  610                 else
  611                         error = copyin(uap->addr, &r.ptevents, uap->data);
  612                 break;
  613         case PT_IO:
  614                 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
  615                 break;
  616         case PT_VM_ENTRY:
  617                 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
  618                 break;
  619         default:
  620                 addr = uap->addr;
  621                 break;
  622         }
  623         if (error)
  624                 return (error);
  625 
  626         error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
  627         if (error)
  628                 return (error);
  629 
  630         switch (uap->req) {
  631         case PT_VM_ENTRY:
  632                 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
  633                 break;
  634         case PT_IO:
  635                 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
  636                 break;
  637         case PT_GETREGS:
  638                 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
  639                 break;
  640         case PT_GETFPREGS:
  641                 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
  642                 break;
  643         case PT_GETDBREGS:
  644                 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
  645                 break;
  646         case PT_GET_EVENT_MASK:
  647                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  648                 error = copyout(&r.ptevents, uap->addr, uap->data);
  649                 break;
  650         case PT_LWPINFO:
  651                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  652                 error = copyout(&r.pl, uap->addr, uap->data);
  653                 break;
  654         case PT_GET_SC_ARGS:
  655                 error = copyout(r.args, uap->addr, MIN(uap->data,
  656                     sizeof(r.args)));
  657                 break;
  658         }
  659 
  660         return (error);
  661 }
  662 #undef COPYIN
  663 #undef COPYOUT
  664 
  665 #ifdef COMPAT_FREEBSD32
  666 /*
  667  *   PROC_READ(regs, td2, addr);
  668  * becomes either:
  669  *   proc_read_regs(td2, addr);
  670  * or
  671  *   proc_read_regs32(td2, addr);
  672  * .. except this is done at runtime.  There is an additional
  673  * complication in that PROC_WRITE disallows 32 bit consumers
  674  * from writing to 64 bit address space targets.
  675  */
  676 #define PROC_READ(w, t, a)      wrap32 ? \
  677         proc_read_ ## w ## 32(t, a) : \
  678         proc_read_ ## w (t, a)
  679 #define PROC_WRITE(w, t, a)     wrap32 ? \
  680         (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
  681         proc_write_ ## w (t, a)
  682 #else
  683 #define PROC_READ(w, t, a)      proc_read_ ## w (t, a)
  684 #define PROC_WRITE(w, t, a)     proc_write_ ## w (t, a)
  685 #endif
  686 
  687 void
  688 proc_set_traced(struct proc *p, bool stop)
  689 {
  690 
  691         sx_assert(&proctree_lock, SX_XLOCKED);
  692         PROC_LOCK_ASSERT(p, MA_OWNED);
  693         p->p_flag |= P_TRACED;
  694         if (stop)
  695                 p->p_flag2 |= P2_PTRACE_FSTP;
  696         p->p_ptevents = PTRACE_DEFAULT;
  697         p->p_oppid = p->p_pptr->p_pid;
  698 }
  699 
  700 int
  701 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
  702 {
  703         struct iovec iov;
  704         struct uio uio;
  705         struct proc *curp, *p, *pp;
  706         struct thread *td2 = NULL, *td3;
  707         struct ptrace_io_desc *piod = NULL;
  708         struct ptrace_lwpinfo *pl;
  709         int error, num, tmp;
  710         int proctree_locked = 0;
  711         lwpid_t tid = 0, *buf;
  712 #ifdef COMPAT_FREEBSD32
  713         int wrap32 = 0, safe = 0;
  714         struct ptrace_io_desc32 *piod32 = NULL;
  715         struct ptrace_lwpinfo32 *pl32 = NULL;
  716         struct ptrace_lwpinfo plr;
  717 #endif
  718 
  719         curp = td->td_proc;
  720 
  721         /* Lock proctree before locking the process. */
  722         switch (req) {
  723         case PT_TRACE_ME:
  724         case PT_ATTACH:
  725         case PT_STEP:
  726         case PT_CONTINUE:
  727         case PT_TO_SCE:
  728         case PT_TO_SCX:
  729         case PT_SYSCALL:
  730         case PT_FOLLOW_FORK:
  731         case PT_LWP_EVENTS:
  732         case PT_GET_EVENT_MASK:
  733         case PT_SET_EVENT_MASK:
  734         case PT_DETACH:
  735         case PT_GET_SC_ARGS:
  736                 sx_xlock(&proctree_lock);
  737                 proctree_locked = 1;
  738                 break;
  739         default:
  740                 break;
  741         }
  742 
  743         if (req == PT_TRACE_ME) {
  744                 p = td->td_proc;
  745                 PROC_LOCK(p);
  746         } else {
  747                 if (pid <= PID_MAX) {
  748                         if ((p = pfind(pid)) == NULL) {
  749                                 if (proctree_locked)
  750                                         sx_xunlock(&proctree_lock);
  751                                 return (ESRCH);
  752                         }
  753                 } else {
  754                         td2 = tdfind(pid, -1);
  755                         if (td2 == NULL) {
  756                                 if (proctree_locked)
  757                                         sx_xunlock(&proctree_lock);
  758                                 return (ESRCH);
  759                         }
  760                         p = td2->td_proc;
  761                         tid = pid;
  762                         pid = p->p_pid;
  763                 }
  764         }
  765         AUDIT_ARG_PROCESS(p);
  766 
  767         if ((p->p_flag & P_WEXIT) != 0) {
  768                 error = ESRCH;
  769                 goto fail;
  770         }
  771         if ((error = p_cansee(td, p)) != 0)
  772                 goto fail;
  773 
  774         if ((error = p_candebug(td, p)) != 0)
  775                 goto fail;
  776 
  777         /*
  778          * System processes can't be debugged.
  779          */
  780         if ((p->p_flag & P_SYSTEM) != 0) {
  781                 error = EINVAL;
  782                 goto fail;
  783         }
  784 
  785         if (tid == 0) {
  786                 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
  787                         KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
  788                         td2 = p->p_xthread;
  789                 } else {
  790                         td2 = FIRST_THREAD_IN_PROC(p);
  791                 }
  792                 tid = td2->td_tid;
  793         }
  794 
  795 #ifdef COMPAT_FREEBSD32
  796         /*
  797          * Test if we're a 32 bit client and what the target is.
  798          * Set the wrap controls accordingly.
  799          */
  800         if (SV_CURPROC_FLAG(SV_ILP32)) {
  801                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
  802                         safe = 1;
  803                 wrap32 = 1;
  804         }
  805 #endif
  806         /*
  807          * Permissions check
  808          */
  809         switch (req) {
  810         case PT_TRACE_ME:
  811                 /*
  812                  * Always legal, when there is a parent process which
  813                  * could trace us.  Otherwise, reject.
  814                  */
  815                 if ((p->p_flag & P_TRACED) != 0) {
  816                         error = EBUSY;
  817                         goto fail;
  818                 }
  819                 if (p->p_pptr == initproc) {
  820                         error = EPERM;
  821                         goto fail;
  822                 }
  823                 break;
  824 
  825         case PT_ATTACH:
  826                 /* Self */
  827                 if (p == td->td_proc) {
  828                         error = EINVAL;
  829                         goto fail;
  830                 }
  831 
  832                 /* Already traced */
  833                 if (p->p_flag & P_TRACED) {
  834                         error = EBUSY;
  835                         goto fail;
  836                 }
  837 
  838                 /* Can't trace an ancestor if you're being traced. */
  839                 if (curp->p_flag & P_TRACED) {
  840                         for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
  841                                 if (pp == p) {
  842                                         error = EINVAL;
  843                                         goto fail;
  844                                 }
  845                         }
  846                 }
  847 
  848 
  849                 /* OK */
  850                 break;
  851 
  852         case PT_CLEARSTEP:
  853                 /* Allow thread to clear single step for itself */
  854                 if (td->td_tid == tid)
  855                         break;
  856 
  857                 /* FALLTHROUGH */
  858         default:
  859                 /* not being traced... */
  860                 if ((p->p_flag & P_TRACED) == 0) {
  861                         error = EPERM;
  862                         goto fail;
  863                 }
  864 
  865                 /* not being traced by YOU */
  866                 if (p->p_pptr != td->td_proc) {
  867                         error = EBUSY;
  868                         goto fail;
  869                 }
  870 
  871                 /* not currently stopped */
  872                 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
  873                     p->p_suspcount != p->p_numthreads  ||
  874                     (p->p_flag & P_WAITED) == 0) {
  875                         error = EBUSY;
  876                         goto fail;
  877                 }
  878 
  879                 /* OK */
  880                 break;
  881         }
  882 
  883         /* Keep this process around until we finish this request. */
  884         _PHOLD(p);
  885 
  886 #ifdef FIX_SSTEP
  887         /*
  888          * Single step fixup ala procfs
  889          */
  890         FIX_SSTEP(td2);
  891 #endif
  892 
  893         /*
  894          * Actually do the requests
  895          */
  896 
  897         td->td_retval[0] = 0;
  898 
  899         switch (req) {
  900         case PT_TRACE_ME:
  901                 /* set my trace flag and "owner" so it can read/write me */
  902                 proc_set_traced(p, false);
  903                 if (p->p_flag & P_PPWAIT)
  904                         p->p_flag |= P_PPTRACE;
  905                 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
  906                 break;
  907 
  908         case PT_ATTACH:
  909                 /* security check done above */
  910                 /*
  911                  * It would be nice if the tracing relationship was separate
  912                  * from the parent relationship but that would require
  913                  * another set of links in the proc struct or for "wait"
  914                  * to scan the entire proc table.  To make life easier,
  915                  * we just re-parent the process we're trying to trace.
  916                  * The old parent is remembered so we can put things back
  917                  * on a "detach".
  918                  */
  919                 proc_set_traced(p, true);
  920                 if (p->p_pptr != td->td_proc) {
  921                         proc_reparent(p, td->td_proc);
  922                 }
  923                 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
  924                     p->p_oppid);
  925 
  926                 sx_xunlock(&proctree_lock);
  927                 proctree_locked = 0;
  928                 MPASS(p->p_xthread == NULL);
  929                 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
  930 
  931                 /*
  932                  * If already stopped due to a stop signal, clear the
  933                  * existing stop before triggering a traced SIGSTOP.
  934                  */
  935                 if ((p->p_flag & P_STOPPED_SIG) != 0) {
  936                         PROC_SLOCK(p);
  937                         p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
  938                         thread_unsuspend(p);
  939                         PROC_SUNLOCK(p);
  940                 }
  941 
  942                 kern_psignal(p, SIGSTOP);
  943                 break;
  944 
  945         case PT_CLEARSTEP:
  946                 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
  947                     p->p_pid);
  948                 error = ptrace_clear_single_step(td2);
  949                 break;
  950 
  951         case PT_SETSTEP:
  952                 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
  953                     p->p_pid);
  954                 error = ptrace_single_step(td2);
  955                 break;
  956 
  957         case PT_SUSPEND:
  958                 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
  959                     p->p_pid);
  960                 td2->td_dbgflags |= TDB_SUSPEND;
  961                 thread_lock(td2);
  962                 td2->td_flags |= TDF_NEEDSUSPCHK;
  963                 thread_unlock(td2);
  964                 break;
  965 
  966         case PT_RESUME:
  967                 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
  968                     p->p_pid);
  969                 td2->td_dbgflags &= ~TDB_SUSPEND;
  970                 break;
  971 
  972         case PT_FOLLOW_FORK:
  973                 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
  974                     p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
  975                     data ? "enabled" : "disabled");
  976                 if (data)
  977                         p->p_ptevents |= PTRACE_FORK;
  978                 else
  979                         p->p_ptevents &= ~PTRACE_FORK;
  980                 break;
  981 
  982         case PT_LWP_EVENTS:
  983                 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
  984                     p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
  985                     data ? "enabled" : "disabled");
  986                 if (data)
  987                         p->p_ptevents |= PTRACE_LWP;
  988                 else
  989                         p->p_ptevents &= ~PTRACE_LWP;
  990                 break;
  991 
  992         case PT_GET_EVENT_MASK:
  993                 if (data != sizeof(p->p_ptevents)) {
  994                         error = EINVAL;
  995                         break;
  996                 }
  997                 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
  998                     p->p_ptevents);
  999                 *(int *)addr = p->p_ptevents;
 1000                 break;
 1001 
 1002         case PT_SET_EVENT_MASK:
 1003                 if (data != sizeof(p->p_ptevents)) {
 1004                         error = EINVAL;
 1005                         break;
 1006                 }
 1007                 tmp = *(int *)addr;
 1008                 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
 1009                     PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
 1010                         error = EINVAL;
 1011                         break;
 1012                 }
 1013                 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
 1014                     p->p_pid, p->p_ptevents, tmp);
 1015                 p->p_ptevents = tmp;
 1016                 break;
 1017 
 1018         case PT_GET_SC_ARGS:
 1019                 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
 1020                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
 1021 #ifdef COMPAT_FREEBSD32
 1022                     || (wrap32 && !safe)
 1023 #endif
 1024                     ) {
 1025                         error = EINVAL;
 1026                         break;
 1027                 }
 1028                 bzero(addr, sizeof(td2->td_sa.args));
 1029 #ifdef COMPAT_FREEBSD32
 1030                 if (wrap32)
 1031                         for (num = 0; num < nitems(td2->td_sa.args); num++)
 1032                                 ((uint32_t *)addr)[num] = (uint32_t)
 1033                                     td2->td_sa.args[num];
 1034                 else
 1035 #endif
 1036                         bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
 1037                             sizeof(register_t));
 1038                 break;
 1039                 
 1040         case PT_STEP:
 1041         case PT_CONTINUE:
 1042         case PT_TO_SCE:
 1043         case PT_TO_SCX:
 1044         case PT_SYSCALL:
 1045         case PT_DETACH:
 1046                 /* Zero means do not send any signal */
 1047                 if (data < 0 || data > _SIG_MAXSIG) {
 1048                         error = EINVAL;
 1049                         break;
 1050                 }
 1051 
 1052                 switch (req) {
 1053                 case PT_STEP:
 1054                         CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
 1055                             td2->td_tid, p->p_pid, data);
 1056                         error = ptrace_single_step(td2);
 1057                         if (error)
 1058                                 goto out;
 1059                         break;
 1060                 case PT_CONTINUE:
 1061                 case PT_TO_SCE:
 1062                 case PT_TO_SCX:
 1063                 case PT_SYSCALL:
 1064                         if (addr != (void *)1) {
 1065                                 error = ptrace_set_pc(td2,
 1066                                     (u_long)(uintfptr_t)addr);
 1067                                 if (error)
 1068                                         goto out;
 1069                         }
 1070                         switch (req) {
 1071                         case PT_TO_SCE:
 1072                                 p->p_ptevents |= PTRACE_SCE;
 1073                                 CTR4(KTR_PTRACE,
 1074                     "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
 1075                                     p->p_pid, p->p_ptevents,
 1076                                     (u_long)(uintfptr_t)addr, data);
 1077                                 break;
 1078                         case PT_TO_SCX:
 1079                                 p->p_ptevents |= PTRACE_SCX;
 1080                                 CTR4(KTR_PTRACE,
 1081                     "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
 1082                                     p->p_pid, p->p_ptevents,
 1083                                     (u_long)(uintfptr_t)addr, data);
 1084                                 break;
 1085                         case PT_SYSCALL:
 1086                                 p->p_ptevents |= PTRACE_SYSCALL;
 1087                                 CTR4(KTR_PTRACE,
 1088                     "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
 1089                                     p->p_pid, p->p_ptevents,
 1090                                     (u_long)(uintfptr_t)addr, data);
 1091                                 break;
 1092                         case PT_CONTINUE:
 1093                                 CTR3(KTR_PTRACE,
 1094                                     "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
 1095                                     p->p_pid, (u_long)(uintfptr_t)addr, data);
 1096                                 break;
 1097                         }
 1098                         break;
 1099                 case PT_DETACH:
 1100                         /*
 1101                          * Reset the process parent.
 1102                          *
 1103                          * NB: This clears P_TRACED before reparenting
 1104                          * a detached process back to its original
 1105                          * parent.  Otherwise the debugee will be set
 1106                          * as an orphan of the debugger.
 1107                          */
 1108                         p->p_flag &= ~(P_TRACED | P_WAITED);
 1109                         if (p->p_oppid != p->p_pptr->p_pid) {
 1110                                 PROC_LOCK(p->p_pptr);
 1111                                 sigqueue_take(p->p_ksi);
 1112                                 PROC_UNLOCK(p->p_pptr);
 1113 
 1114                                 pp = proc_realparent(p);
 1115                                 proc_reparent(p, pp);
 1116                                 if (pp == initproc)
 1117                                         p->p_sigparent = SIGCHLD;
 1118                                 CTR3(KTR_PTRACE,
 1119                             "PT_DETACH: pid %d reparented to pid %d, sig %d",
 1120                                     p->p_pid, pp->p_pid, data);
 1121                         } else
 1122                                 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
 1123                                     p->p_pid, data);
 1124                         p->p_oppid = 0;
 1125                         p->p_ptevents = 0;
 1126                         FOREACH_THREAD_IN_PROC(p, td3) {
 1127                                 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
 1128                                         sigqueue_delete(&td3->td_sigqueue,
 1129                                             SIGSTOP);
 1130                                 }
 1131                                 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
 1132                                     TDB_SUSPEND);
 1133                         }
 1134 
 1135                         if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
 1136                                 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
 1137                                 p->p_flag2 &= ~P2_PTRACE_FSTP;
 1138                         }
 1139 
 1140                         /* should we send SIGCHLD? */
 1141                         /* childproc_continued(p); */
 1142                         break;
 1143                 }
 1144 
 1145                 sx_xunlock(&proctree_lock);
 1146                 proctree_locked = 0;
 1147 
 1148         sendsig:
 1149                 MPASS(proctree_locked == 0);
 1150                 
 1151                 /* 
 1152                  * Clear the pending event for the thread that just
 1153                  * reported its event (p_xthread).  This may not be
 1154                  * the thread passed to PT_CONTINUE, PT_STEP, etc. if
 1155                  * the debugger is resuming a different thread.
 1156                  *
 1157                  * Deliver any pending signal via the reporting thread.
 1158                  */
 1159                 MPASS(p->p_xthread != NULL);
 1160                 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
 1161                 p->p_xthread->td_xsig = data;
 1162                 p->p_xthread = NULL;
 1163                 p->p_xsig = data;
 1164 
 1165                 /*
 1166                  * P_WKILLED is insurance that a PT_KILL/SIGKILL
 1167                  * always works immediately, even if another thread is
 1168                  * unsuspended first and attempts to handle a
 1169                  * different signal or if the POSIX.1b style signal
 1170                  * queue cannot accommodate any new signals.
 1171                  */
 1172                 if (data == SIGKILL)
 1173                         proc_wkilled(p);
 1174 
 1175                 /*
 1176                  * Unsuspend all threads.  To leave a thread
 1177                  * suspended, use PT_SUSPEND to suspend it before
 1178                  * continuing the process.
 1179                  */
 1180                 PROC_SLOCK(p);
 1181                 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
 1182                 thread_unsuspend(p);
 1183                 PROC_SUNLOCK(p);
 1184                 break;
 1185 
 1186         case PT_WRITE_I:
 1187         case PT_WRITE_D:
 1188                 td2->td_dbgflags |= TDB_USERWR;
 1189                 PROC_UNLOCK(p);
 1190                 error = 0;
 1191                 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
 1192                     sizeof(int)) != sizeof(int))
 1193                         error = ENOMEM;
 1194                 else
 1195                         CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
 1196                             p->p_pid, addr, data);
 1197                 PROC_LOCK(p);
 1198                 break;
 1199 
 1200         case PT_READ_I:
 1201         case PT_READ_D:
 1202                 PROC_UNLOCK(p);
 1203                 error = tmp = 0;
 1204                 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
 1205                     sizeof(int)) != sizeof(int))
 1206                         error = ENOMEM;
 1207                 else
 1208                         CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
 1209                             p->p_pid, addr, tmp);
 1210                 td->td_retval[0] = tmp;
 1211                 PROC_LOCK(p);
 1212                 break;
 1213 
 1214         case PT_IO:
 1215 #ifdef COMPAT_FREEBSD32
 1216                 if (wrap32) {
 1217                         piod32 = addr;
 1218                         iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
 1219                         iov.iov_len = piod32->piod_len;
 1220                         uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
 1221                         uio.uio_resid = piod32->piod_len;
 1222                 } else
 1223 #endif
 1224                 {
 1225                         piod = addr;
 1226                         iov.iov_base = piod->piod_addr;
 1227                         iov.iov_len = piod->piod_len;
 1228                         uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
 1229                         uio.uio_resid = piod->piod_len;
 1230                 }
 1231                 uio.uio_iov = &iov;
 1232                 uio.uio_iovcnt = 1;
 1233                 uio.uio_segflg = UIO_USERSPACE;
 1234                 uio.uio_td = td;
 1235 #ifdef COMPAT_FREEBSD32
 1236                 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
 1237 #else
 1238                 tmp = piod->piod_op;
 1239 #endif
 1240                 switch (tmp) {
 1241                 case PIOD_READ_D:
 1242                 case PIOD_READ_I:
 1243                         CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
 1244                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1245                         uio.uio_rw = UIO_READ;
 1246                         break;
 1247                 case PIOD_WRITE_D:
 1248                 case PIOD_WRITE_I:
 1249                         CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
 1250                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1251                         td2->td_dbgflags |= TDB_USERWR;
 1252                         uio.uio_rw = UIO_WRITE;
 1253                         break;
 1254                 default:
 1255                         error = EINVAL;
 1256                         goto out;
 1257                 }
 1258                 PROC_UNLOCK(p);
 1259                 error = proc_rwmem(p, &uio);
 1260 #ifdef COMPAT_FREEBSD32
 1261                 if (wrap32)
 1262                         piod32->piod_len -= uio.uio_resid;
 1263                 else
 1264 #endif
 1265                         piod->piod_len -= uio.uio_resid;
 1266                 PROC_LOCK(p);
 1267                 break;
 1268 
 1269         case PT_KILL:
 1270                 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
 1271                 data = SIGKILL;
 1272                 goto sendsig;   /* in PT_CONTINUE above */
 1273 
 1274         case PT_SETREGS:
 1275                 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
 1276                     p->p_pid);
 1277                 td2->td_dbgflags |= TDB_USERWR;
 1278                 error = PROC_WRITE(regs, td2, addr);
 1279                 break;
 1280 
 1281         case PT_GETREGS:
 1282                 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
 1283                     p->p_pid);
 1284                 error = PROC_READ(regs, td2, addr);
 1285                 break;
 1286 
 1287         case PT_SETFPREGS:
 1288                 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
 1289                     p->p_pid);
 1290                 td2->td_dbgflags |= TDB_USERWR;
 1291                 error = PROC_WRITE(fpregs, td2, addr);
 1292                 break;
 1293 
 1294         case PT_GETFPREGS:
 1295                 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
 1296                     p->p_pid);
 1297                 error = PROC_READ(fpregs, td2, addr);
 1298                 break;
 1299 
 1300         case PT_SETDBREGS:
 1301                 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
 1302                     p->p_pid);
 1303                 td2->td_dbgflags |= TDB_USERWR;
 1304                 error = PROC_WRITE(dbregs, td2, addr);
 1305                 break;
 1306 
 1307         case PT_GETDBREGS:
 1308                 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
 1309                     p->p_pid);
 1310                 error = PROC_READ(dbregs, td2, addr);
 1311                 break;
 1312 
 1313         case PT_LWPINFO:
 1314                 if (data <= 0 ||
 1315 #ifdef COMPAT_FREEBSD32
 1316                     (!wrap32 && data > sizeof(*pl)) ||
 1317                     (wrap32 && data > sizeof(*pl32))) {
 1318 #else
 1319                     data > sizeof(*pl)) {
 1320 #endif
 1321                         error = EINVAL;
 1322                         break;
 1323                 }
 1324 #ifdef COMPAT_FREEBSD32
 1325                 if (wrap32) {
 1326                         pl = &plr;
 1327                         pl32 = addr;
 1328                 } else
 1329 #endif
 1330                 pl = addr;
 1331                 bzero(pl, sizeof(*pl));
 1332                 pl->pl_lwpid = td2->td_tid;
 1333                 pl->pl_event = PL_EVENT_NONE;
 1334                 pl->pl_flags = 0;
 1335                 if (td2->td_dbgflags & TDB_XSIG) {
 1336                         pl->pl_event = PL_EVENT_SIGNAL;
 1337                         if (td2->td_si.si_signo != 0 &&
 1338 #ifdef COMPAT_FREEBSD32
 1339                             ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
 1340                             pl_siginfo) + sizeof(pl->pl_siginfo)) ||
 1341                             (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
 1342                             pl_siginfo) + sizeof(struct siginfo32)))
 1343 #else
 1344                             data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
 1345                             + sizeof(pl->pl_siginfo)
 1346 #endif
 1347                         ){
 1348                                 pl->pl_flags |= PL_FLAG_SI;
 1349                                 pl->pl_siginfo = td2->td_si;
 1350                         }
 1351                 }
 1352                 if (td2->td_dbgflags & TDB_SCE)
 1353                         pl->pl_flags |= PL_FLAG_SCE;
 1354                 else if (td2->td_dbgflags & TDB_SCX)
 1355                         pl->pl_flags |= PL_FLAG_SCX;
 1356                 if (td2->td_dbgflags & TDB_EXEC)
 1357                         pl->pl_flags |= PL_FLAG_EXEC;
 1358                 if (td2->td_dbgflags & TDB_FORK) {
 1359                         pl->pl_flags |= PL_FLAG_FORKED;
 1360                         pl->pl_child_pid = td2->td_dbg_forked;
 1361                         if (td2->td_dbgflags & TDB_VFORK)
 1362                                 pl->pl_flags |= PL_FLAG_VFORKED;
 1363                 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
 1364                     TDB_VFORK)
 1365                         pl->pl_flags |= PL_FLAG_VFORK_DONE;
 1366                 if (td2->td_dbgflags & TDB_CHILD)
 1367                         pl->pl_flags |= PL_FLAG_CHILD;
 1368                 if (td2->td_dbgflags & TDB_BORN)
 1369                         pl->pl_flags |= PL_FLAG_BORN;
 1370                 if (td2->td_dbgflags & TDB_EXIT)
 1371                         pl->pl_flags |= PL_FLAG_EXITED;
 1372                 pl->pl_sigmask = td2->td_sigmask;
 1373                 pl->pl_siglist = td2->td_siglist;
 1374                 strcpy(pl->pl_tdname, td2->td_name);
 1375                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
 1376                         pl->pl_syscall_code = td2->td_sa.code;
 1377                         pl->pl_syscall_narg = td2->td_sa.narg;
 1378                 } else {
 1379                         pl->pl_syscall_code = 0;
 1380                         pl->pl_syscall_narg = 0;
 1381                 }
 1382 #ifdef COMPAT_FREEBSD32
 1383                 if (wrap32)
 1384                         ptrace_lwpinfo_to32(pl, pl32);
 1385 #endif
 1386                 CTR6(KTR_PTRACE,
 1387     "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
 1388                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
 1389                     pl->pl_child_pid, pl->pl_syscall_code);
 1390                 break;
 1391 
 1392         case PT_GETNUMLWPS:
 1393                 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
 1394                     p->p_numthreads);
 1395                 td->td_retval[0] = p->p_numthreads;
 1396                 break;
 1397 
 1398         case PT_GETLWPLIST:
 1399                 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
 1400                     p->p_pid, data, p->p_numthreads);
 1401                 if (data <= 0) {
 1402                         error = EINVAL;
 1403                         break;
 1404                 }
 1405                 num = imin(p->p_numthreads, data);
 1406                 PROC_UNLOCK(p);
 1407                 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
 1408                 tmp = 0;
 1409                 PROC_LOCK(p);
 1410                 FOREACH_THREAD_IN_PROC(p, td2) {
 1411                         if (tmp >= num)
 1412                                 break;
 1413                         buf[tmp++] = td2->td_tid;
 1414                 }
 1415                 PROC_UNLOCK(p);
 1416                 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
 1417                 free(buf, M_TEMP);
 1418                 if (!error)
 1419                         td->td_retval[0] = tmp;
 1420                 PROC_LOCK(p);
 1421                 break;
 1422 
 1423         case PT_VM_TIMESTAMP:
 1424                 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
 1425                     p->p_pid, p->p_vmspace->vm_map.timestamp);
 1426                 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
 1427                 break;
 1428 
 1429         case PT_VM_ENTRY:
 1430                 PROC_UNLOCK(p);
 1431 #ifdef COMPAT_FREEBSD32
 1432                 if (wrap32)
 1433                         error = ptrace_vm_entry32(td, p, addr);
 1434                 else
 1435 #endif
 1436                 error = ptrace_vm_entry(td, p, addr);
 1437                 PROC_LOCK(p);
 1438                 break;
 1439 
 1440         default:
 1441 #ifdef __HAVE_PTRACE_MACHDEP
 1442                 if (req >= PT_FIRSTMACH) {
 1443                         PROC_UNLOCK(p);
 1444                         error = cpu_ptrace(td2, req, addr, data);
 1445                         PROC_LOCK(p);
 1446                 } else
 1447 #endif
 1448                         /* Unknown request. */
 1449                         error = EINVAL;
 1450                 break;
 1451         }
 1452 
 1453 out:
 1454         /* Drop our hold on this process now that the request has completed. */
 1455         _PRELE(p);
 1456 fail:
 1457         PROC_UNLOCK(p);
 1458         if (proctree_locked)
 1459                 sx_xunlock(&proctree_lock);
 1460         return (error);
 1461 }
 1462 #undef PROC_READ
 1463 #undef PROC_WRITE
 1464 
 1465 /*
 1466  * Stop a process because of a debugging event;
 1467  * stay stopped until p->p_step is cleared
 1468  * (cleared by PIOCCONT in procfs).
 1469  */
 1470 void
 1471 stopevent(struct proc *p, unsigned int event, unsigned int val)
 1472 {
 1473 
 1474         PROC_LOCK_ASSERT(p, MA_OWNED);
 1475         p->p_step = 1;
 1476         CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
 1477             val);
 1478         do {
 1479                 if (event != S_EXIT)
 1480                         p->p_xsig = val;
 1481                 p->p_xthread = NULL;
 1482                 p->p_stype = event;     /* Which event caused the stop? */
 1483                 wakeup(&p->p_stype);    /* Wake up any PIOCWAIT'ing procs */
 1484                 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
 1485         } while (p->p_step);
 1486 }

Cache object: 3223402fc446f6b691fba4959fe81f56


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