The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * Copyright (c) 1994, Sean Eric Fagan
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by Sean Eric Fagan.
   16  * 4. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: head/sys/kern/sys_process.c 292894 2015-12-29 23:25:26Z jhb $");
   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/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 
   91 struct ptrace_lwpinfo32 {
   92         lwpid_t pl_lwpid;       /* LWP described. */
   93         int     pl_event;       /* Event that stopped the LWP. */
   94         int     pl_flags;       /* LWP flags. */
   95         sigset_t        pl_sigmask;     /* LWP signal mask */
   96         sigset_t        pl_siglist;     /* LWP pending signal */
   97         struct siginfo32 pl_siginfo;    /* siginfo for signal */
   98         char    pl_tdname[MAXCOMLEN + 1];       /* LWP name. */
   99         pid_t   pl_child_pid;           /* New child pid */
  100         u_int           pl_syscall_code;
  101         u_int           pl_syscall_narg;
  102 };
  103 
  104 #endif
  105 
  106 /*
  107  * Functions implemented using PROC_ACTION():
  108  *
  109  * proc_read_regs(proc, regs)
  110  *      Get the current user-visible register set from the process
  111  *      and copy it into the regs structure (<machine/reg.h>).
  112  *      The process is stopped at the time read_regs is called.
  113  *
  114  * proc_write_regs(proc, regs)
  115  *      Update the current register set from the passed in regs
  116  *      structure.  Take care to avoid clobbering special CPU
  117  *      registers or privileged bits in the PSL.
  118  *      Depending on the architecture this may have fix-up work to do,
  119  *      especially if the IAR or PCW are modified.
  120  *      The process is stopped at the time write_regs is called.
  121  *
  122  * proc_read_fpregs, proc_write_fpregs
  123  *      deal with the floating point register set, otherwise as above.
  124  *
  125  * proc_read_dbregs, proc_write_dbregs
  126  *      deal with the processor debug register set, otherwise as above.
  127  *
  128  * proc_sstep(proc)
  129  *      Arrange for the process to trap after executing a single instruction.
  130  */
  131 
  132 #define PROC_ACTION(action) do {                                        \
  133         int error;                                                      \
  134                                                                         \
  135         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);                        \
  136         if ((td->td_proc->p_flag & P_INMEM) == 0)                       \
  137                 error = EIO;                                            \
  138         else                                                            \
  139                 error = (action);                                       \
  140         return (error);                                                 \
  141 } while(0)
  142 
  143 int
  144 proc_read_regs(struct thread *td, struct reg *regs)
  145 {
  146 
  147         PROC_ACTION(fill_regs(td, regs));
  148 }
  149 
  150 int
  151 proc_write_regs(struct thread *td, struct reg *regs)
  152 {
  153 
  154         PROC_ACTION(set_regs(td, regs));
  155 }
  156 
  157 int
  158 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
  159 {
  160 
  161         PROC_ACTION(fill_dbregs(td, dbregs));
  162 }
  163 
  164 int
  165 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
  166 {
  167 
  168         PROC_ACTION(set_dbregs(td, dbregs));
  169 }
  170 
  171 /*
  172  * Ptrace doesn't support fpregs at all, and there are no security holes
  173  * or translations for fpregs, so we can just copy them.
  174  */
  175 int
  176 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
  177 {
  178 
  179         PROC_ACTION(fill_fpregs(td, fpregs));
  180 }
  181 
  182 int
  183 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
  184 {
  185 
  186         PROC_ACTION(set_fpregs(td, fpregs));
  187 }
  188 
  189 #ifdef COMPAT_FREEBSD32
  190 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
  191 int
  192 proc_read_regs32(struct thread *td, struct reg32 *regs32)
  193 {
  194 
  195         PROC_ACTION(fill_regs32(td, regs32));
  196 }
  197 
  198 int
  199 proc_write_regs32(struct thread *td, struct reg32 *regs32)
  200 {
  201 
  202         PROC_ACTION(set_regs32(td, regs32));
  203 }
  204 
  205 int
  206 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  207 {
  208 
  209         PROC_ACTION(fill_dbregs32(td, dbregs32));
  210 }
  211 
  212 int
  213 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  214 {
  215 
  216         PROC_ACTION(set_dbregs32(td, dbregs32));
  217 }
  218 
  219 int
  220 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  221 {
  222 
  223         PROC_ACTION(fill_fpregs32(td, fpregs32));
  224 }
  225 
  226 int
  227 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  228 {
  229 
  230         PROC_ACTION(set_fpregs32(td, fpregs32));
  231 }
  232 #endif
  233 
  234 int
  235 proc_sstep(struct thread *td)
  236 {
  237 
  238         PROC_ACTION(ptrace_single_step(td));
  239 }
  240 
  241 int
  242 proc_rwmem(struct proc *p, struct uio *uio)
  243 {
  244         vm_map_t map;
  245         vm_offset_t pageno;             /* page number */
  246         vm_prot_t reqprot;
  247         int error, fault_flags, page_offset, writing;
  248 
  249         /*
  250          * Assert that someone has locked this vmspace.  (Should be
  251          * curthread but we can't assert that.)  This keeps the process
  252          * from exiting out from under us until this operation completes.
  253          */
  254         PROC_ASSERT_HELD(p);
  255         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  256 
  257         /*
  258          * The map we want...
  259          */
  260         map = &p->p_vmspace->vm_map;
  261 
  262         /*
  263          * If we are writing, then we request vm_fault() to create a private
  264          * copy of each page.  Since these copies will not be writeable by the
  265          * process, we must explicity request that they be dirtied.
  266          */
  267         writing = uio->uio_rw == UIO_WRITE;
  268         reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
  269         fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
  270 
  271         /*
  272          * Only map in one page at a time.  We don't have to, but it
  273          * makes things easier.  This way is trivial - right?
  274          */
  275         do {
  276                 vm_offset_t uva;
  277                 u_int len;
  278                 vm_page_t m;
  279 
  280                 uva = (vm_offset_t)uio->uio_offset;
  281 
  282                 /*
  283                  * Get the page number of this segment.
  284                  */
  285                 pageno = trunc_page(uva);
  286                 page_offset = uva - pageno;
  287 
  288                 /*
  289                  * How many bytes to copy
  290                  */
  291                 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
  292 
  293                 /*
  294                  * Fault and hold the page on behalf of the process.
  295                  */
  296                 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
  297                 if (error != KERN_SUCCESS) {
  298                         if (error == KERN_RESOURCE_SHORTAGE)
  299                                 error = ENOMEM;
  300                         else
  301                                 error = EFAULT;
  302                         break;
  303                 }
  304 
  305                 /*
  306                  * Now do the i/o move.
  307                  */
  308                 error = uiomove_fromphys(&m, page_offset, len, uio);
  309 
  310                 /* Make the I-cache coherent for breakpoints. */
  311                 if (writing && error == 0) {
  312                         vm_map_lock_read(map);
  313                         if (vm_map_check_protection(map, pageno, pageno +
  314                             PAGE_SIZE, VM_PROT_EXECUTE))
  315                                 vm_sync_icache(map, uva, len);
  316                         vm_map_unlock_read(map);
  317                 }
  318 
  319                 /*
  320                  * Release the page.
  321                  */
  322                 vm_page_lock(m);
  323                 vm_page_unhold(m);
  324                 vm_page_unlock(m);
  325 
  326         } while (error == 0 && uio->uio_resid > 0);
  327 
  328         return (error);
  329 }
  330 
  331 static ssize_t
  332 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  333     size_t len, enum uio_rw rw)
  334 {
  335         struct iovec iov;
  336         struct uio uio;
  337         ssize_t slen;
  338         int error;
  339 
  340         MPASS(len < SSIZE_MAX);
  341         slen = (ssize_t)len;
  342 
  343         iov.iov_base = (caddr_t)buf;
  344         iov.iov_len = len;
  345         uio.uio_iov = &iov;
  346         uio.uio_iovcnt = 1;
  347         uio.uio_offset = va;
  348         uio.uio_resid = slen;
  349         uio.uio_segflg = UIO_SYSSPACE;
  350         uio.uio_rw = rw;
  351         uio.uio_td = td;
  352         error = proc_rwmem(p, &uio);
  353         if (uio.uio_resid == slen)
  354                 return (-1);
  355         return (slen - uio.uio_resid);
  356 }
  357 
  358 ssize_t
  359 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  360     size_t len)
  361 {
  362 
  363         return (proc_iop(td, p, va, buf, len, UIO_READ));
  364 }
  365 
  366 ssize_t
  367 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  368     size_t len)
  369 {
  370 
  371         return (proc_iop(td, p, va, buf, len, UIO_WRITE));
  372 }
  373 
  374 static int
  375 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
  376 {
  377         struct vattr vattr;
  378         vm_map_t map;
  379         vm_map_entry_t entry;
  380         vm_object_t obj, tobj, lobj;
  381         struct vmspace *vm;
  382         struct vnode *vp;
  383         char *freepath, *fullpath;
  384         u_int pathlen;
  385         int error, index;
  386 
  387         error = 0;
  388         obj = NULL;
  389 
  390         vm = vmspace_acquire_ref(p);
  391         map = &vm->vm_map;
  392         vm_map_lock_read(map);
  393 
  394         do {
  395                 entry = map->header.next;
  396                 index = 0;
  397                 while (index < pve->pve_entry && entry != &map->header) {
  398                         entry = entry->next;
  399                         index++;
  400                 }
  401                 if (index != pve->pve_entry) {
  402                         error = EINVAL;
  403                         break;
  404                 }
  405                 while (entry != &map->header &&
  406                     (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
  407                         entry = entry->next;
  408                         index++;
  409                 }
  410                 if (entry == &map->header) {
  411                         error = ENOENT;
  412                         break;
  413                 }
  414 
  415                 /* We got an entry. */
  416                 pve->pve_entry = index + 1;
  417                 pve->pve_timestamp = map->timestamp;
  418                 pve->pve_start = entry->start;
  419                 pve->pve_end = entry->end - 1;
  420                 pve->pve_offset = entry->offset;
  421                 pve->pve_prot = entry->protection;
  422 
  423                 /* Backing object's path needed? */
  424                 if (pve->pve_pathlen == 0)
  425                         break;
  426 
  427                 pathlen = pve->pve_pathlen;
  428                 pve->pve_pathlen = 0;
  429 
  430                 obj = entry->object.vm_object;
  431                 if (obj != NULL)
  432                         VM_OBJECT_RLOCK(obj);
  433         } while (0);
  434 
  435         vm_map_unlock_read(map);
  436         vmspace_free(vm);
  437 
  438         pve->pve_fsid = VNOVAL;
  439         pve->pve_fileid = VNOVAL;
  440 
  441         if (error == 0 && obj != NULL) {
  442                 lobj = obj;
  443                 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
  444                         if (tobj != obj)
  445                                 VM_OBJECT_RLOCK(tobj);
  446                         if (lobj != obj)
  447                                 VM_OBJECT_RUNLOCK(lobj);
  448                         lobj = tobj;
  449                         pve->pve_offset += tobj->backing_object_offset;
  450                 }
  451                 vp = vm_object_vnode(lobj);
  452                 if (vp != NULL)
  453                         vref(vp);
  454                 if (lobj != obj)
  455                         VM_OBJECT_RUNLOCK(lobj);
  456                 VM_OBJECT_RUNLOCK(obj);
  457 
  458                 if (vp != NULL) {
  459                         freepath = NULL;
  460                         fullpath = NULL;
  461                         vn_fullpath(td, vp, &fullpath, &freepath);
  462                         vn_lock(vp, LK_SHARED | LK_RETRY);
  463                         if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
  464                                 pve->pve_fileid = vattr.va_fileid;
  465                                 pve->pve_fsid = vattr.va_fsid;
  466                         }
  467                         vput(vp);
  468 
  469                         if (fullpath != NULL) {
  470                                 pve->pve_pathlen = strlen(fullpath) + 1;
  471                                 if (pve->pve_pathlen <= pathlen) {
  472                                         error = copyout(fullpath, pve->pve_path,
  473                                             pve->pve_pathlen);
  474                                 } else
  475                                         error = ENAMETOOLONG;
  476                         }
  477                         if (freepath != NULL)
  478                                 free(freepath, M_TEMP);
  479                 }
  480         }
  481         if (error == 0)
  482                 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
  483                     p->p_pid, pve->pve_entry, pve->pve_start);
  484 
  485         return (error);
  486 }
  487 
  488 #ifdef COMPAT_FREEBSD32
  489 static int
  490 ptrace_vm_entry32(struct thread *td, struct proc *p,
  491     struct ptrace_vm_entry32 *pve32)
  492 {
  493         struct ptrace_vm_entry pve;
  494         int error;
  495 
  496         pve.pve_entry = pve32->pve_entry;
  497         pve.pve_pathlen = pve32->pve_pathlen;
  498         pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
  499 
  500         error = ptrace_vm_entry(td, p, &pve);
  501         if (error == 0) {
  502                 pve32->pve_entry = pve.pve_entry;
  503                 pve32->pve_timestamp = pve.pve_timestamp;
  504                 pve32->pve_start = pve.pve_start;
  505                 pve32->pve_end = pve.pve_end;
  506                 pve32->pve_offset = pve.pve_offset;
  507                 pve32->pve_prot = pve.pve_prot;
  508                 pve32->pve_fileid = pve.pve_fileid;
  509                 pve32->pve_fsid = pve.pve_fsid;
  510         }
  511 
  512         pve32->pve_pathlen = pve.pve_pathlen;
  513         return (error);
  514 }
  515 
  516 static void
  517 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
  518     struct ptrace_lwpinfo32 *pl32)
  519 {
  520 
  521         pl32->pl_lwpid = pl->pl_lwpid;
  522         pl32->pl_event = pl->pl_event;
  523         pl32->pl_flags = pl->pl_flags;
  524         pl32->pl_sigmask = pl->pl_sigmask;
  525         pl32->pl_siglist = pl->pl_siglist;
  526         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
  527         strcpy(pl32->pl_tdname, pl->pl_tdname);
  528         pl32->pl_child_pid = pl->pl_child_pid;
  529         pl32->pl_syscall_code = pl->pl_syscall_code;
  530         pl32->pl_syscall_narg = pl->pl_syscall_narg;
  531 }
  532 #endif /* COMPAT_FREEBSD32 */
  533 
  534 /*
  535  * Process debugging system call.
  536  */
  537 #ifndef _SYS_SYSPROTO_H_
  538 struct ptrace_args {
  539         int     req;
  540         pid_t   pid;
  541         caddr_t addr;
  542         int     data;
  543 };
  544 #endif
  545 
  546 #ifdef COMPAT_FREEBSD32
  547 /*
  548  * This CPP subterfuge is to try and reduce the number of ifdefs in
  549  * the body of the code.
  550  *   COPYIN(uap->addr, &r.reg, sizeof r.reg);
  551  * becomes either:
  552  *   copyin(uap->addr, &r.reg, sizeof r.reg);
  553  * or
  554  *   copyin(uap->addr, &r.reg32, sizeof r.reg32);
  555  * .. except this is done at runtime.
  556  */
  557 #define COPYIN(u, k, s)         wrap32 ? \
  558         copyin(u, k ## 32, s ## 32) : \
  559         copyin(u, k, s)
  560 #define COPYOUT(k, u, s)        wrap32 ? \
  561         copyout(k ## 32, u, s ## 32) : \
  562         copyout(k, u, s)
  563 #else
  564 #define COPYIN(u, k, s)         copyin(u, k, s)
  565 #define COPYOUT(k, u, s)        copyout(k, u, s)
  566 #endif
  567 int
  568 sys_ptrace(struct thread *td, struct ptrace_args *uap)
  569 {
  570         /*
  571          * XXX this obfuscation is to reduce stack usage, but the register
  572          * structs may be too large to put on the stack anyway.
  573          */
  574         union {
  575                 struct ptrace_io_desc piod;
  576                 struct ptrace_lwpinfo pl;
  577                 struct ptrace_vm_entry pve;
  578                 struct dbreg dbreg;
  579                 struct fpreg fpreg;
  580                 struct reg reg;
  581 #ifdef COMPAT_FREEBSD32
  582                 struct dbreg32 dbreg32;
  583                 struct fpreg32 fpreg32;
  584                 struct reg32 reg32;
  585                 struct ptrace_io_desc32 piod32;
  586                 struct ptrace_lwpinfo32 pl32;
  587                 struct ptrace_vm_entry32 pve32;
  588 #endif
  589         } r;
  590         void *addr;
  591         int error = 0;
  592 #ifdef COMPAT_FREEBSD32
  593         int wrap32 = 0;
  594 
  595         if (SV_CURPROC_FLAG(SV_ILP32))
  596                 wrap32 = 1;
  597 #endif
  598         AUDIT_ARG_PID(uap->pid);
  599         AUDIT_ARG_CMD(uap->req);
  600         AUDIT_ARG_VALUE(uap->data);
  601         addr = &r;
  602         switch (uap->req) {
  603         case PT_GETREGS:
  604         case PT_GETFPREGS:
  605         case PT_GETDBREGS:
  606         case PT_LWPINFO:
  607                 break;
  608         case PT_SETREGS:
  609                 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
  610                 break;
  611         case PT_SETFPREGS:
  612                 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
  613                 break;
  614         case PT_SETDBREGS:
  615                 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
  616                 break;
  617         case PT_IO:
  618                 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
  619                 break;
  620         case PT_VM_ENTRY:
  621                 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
  622                 break;
  623         default:
  624                 addr = uap->addr;
  625                 break;
  626         }
  627         if (error)
  628                 return (error);
  629 
  630         error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
  631         if (error)
  632                 return (error);
  633 
  634         switch (uap->req) {
  635         case PT_VM_ENTRY:
  636                 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
  637                 break;
  638         case PT_IO:
  639                 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
  640                 break;
  641         case PT_GETREGS:
  642                 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
  643                 break;
  644         case PT_GETFPREGS:
  645                 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
  646                 break;
  647         case PT_GETDBREGS:
  648                 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
  649                 break;
  650         case PT_LWPINFO:
  651                 error = copyout(&r.pl, uap->addr, uap->data);
  652                 break;
  653         }
  654 
  655         return (error);
  656 }
  657 #undef COPYIN
  658 #undef COPYOUT
  659 
  660 #ifdef COMPAT_FREEBSD32
  661 /*
  662  *   PROC_READ(regs, td2, addr);
  663  * becomes either:
  664  *   proc_read_regs(td2, addr);
  665  * or
  666  *   proc_read_regs32(td2, addr);
  667  * .. except this is done at runtime.  There is an additional
  668  * complication in that PROC_WRITE disallows 32 bit consumers
  669  * from writing to 64 bit address space targets.
  670  */
  671 #define PROC_READ(w, t, a)      wrap32 ? \
  672         proc_read_ ## w ## 32(t, a) : \
  673         proc_read_ ## w (t, a)
  674 #define PROC_WRITE(w, t, a)     wrap32 ? \
  675         (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
  676         proc_write_ ## w (t, a)
  677 #else
  678 #define PROC_READ(w, t, a)      proc_read_ ## w (t, a)
  679 #define PROC_WRITE(w, t, a)     proc_write_ ## w (t, a)
  680 #endif
  681 
  682 int
  683 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
  684 {
  685         struct iovec iov;
  686         struct uio uio;
  687         struct proc *curp, *p, *pp;
  688         struct thread *td2 = NULL, *td3;
  689         struct ptrace_io_desc *piod = NULL;
  690         struct ptrace_lwpinfo *pl;
  691         int error, num, tmp;
  692         int proctree_locked = 0;
  693         lwpid_t tid = 0, *buf;
  694 #ifdef COMPAT_FREEBSD32
  695         int wrap32 = 0, safe = 0;
  696         struct ptrace_io_desc32 *piod32 = NULL;
  697         struct ptrace_lwpinfo32 *pl32 = NULL;
  698         struct ptrace_lwpinfo plr;
  699 #endif
  700 
  701         curp = td->td_proc;
  702 
  703         /* Lock proctree before locking the process. */
  704         switch (req) {
  705         case PT_TRACE_ME:
  706         case PT_ATTACH:
  707         case PT_STEP:
  708         case PT_CONTINUE:
  709         case PT_TO_SCE:
  710         case PT_TO_SCX:
  711         case PT_SYSCALL:
  712         case PT_FOLLOW_FORK:
  713         case PT_LWP_EVENTS:
  714         case PT_DETACH:
  715                 sx_xlock(&proctree_lock);
  716                 proctree_locked = 1;
  717                 break;
  718         default:
  719                 break;
  720         }
  721 
  722         if (req == PT_TRACE_ME) {
  723                 p = td->td_proc;
  724                 PROC_LOCK(p);
  725         } else {
  726                 if (pid <= PID_MAX) {
  727                         if ((p = pfind(pid)) == NULL) {
  728                                 if (proctree_locked)
  729                                         sx_xunlock(&proctree_lock);
  730                                 return (ESRCH);
  731                         }
  732                 } else {
  733                         td2 = tdfind(pid, -1);
  734                         if (td2 == NULL) {
  735                                 if (proctree_locked)
  736                                         sx_xunlock(&proctree_lock);
  737                                 return (ESRCH);
  738                         }
  739                         p = td2->td_proc;
  740                         tid = pid;
  741                         pid = p->p_pid;
  742                 }
  743         }
  744         AUDIT_ARG_PROCESS(p);
  745 
  746         if ((p->p_flag & P_WEXIT) != 0) {
  747                 error = ESRCH;
  748                 goto fail;
  749         }
  750         if ((error = p_cansee(td, p)) != 0)
  751                 goto fail;
  752 
  753         if ((error = p_candebug(td, p)) != 0)
  754                 goto fail;
  755 
  756         /*
  757          * System processes can't be debugged.
  758          */
  759         if ((p->p_flag & P_SYSTEM) != 0) {
  760                 error = EINVAL;
  761                 goto fail;
  762         }
  763 
  764         if (tid == 0) {
  765                 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
  766                         KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
  767                         td2 = p->p_xthread;
  768                 } else {
  769                         td2 = FIRST_THREAD_IN_PROC(p);
  770                 }
  771                 tid = td2->td_tid;
  772         }
  773 
  774 #ifdef COMPAT_FREEBSD32
  775         /*
  776          * Test if we're a 32 bit client and what the target is.
  777          * Set the wrap controls accordingly.
  778          */
  779         if (SV_CURPROC_FLAG(SV_ILP32)) {
  780                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
  781                         safe = 1;
  782                 wrap32 = 1;
  783         }
  784 #endif
  785         /*
  786          * Permissions check
  787          */
  788         switch (req) {
  789         case PT_TRACE_ME:
  790                 /*
  791                  * Always legal, when there is a parent process which
  792                  * could trace us.  Otherwise, reject.
  793                  */
  794                 if ((p->p_flag & P_TRACED) != 0) {
  795                         error = EBUSY;
  796                         goto fail;
  797                 }
  798                 if (p->p_pptr == initproc) {
  799                         error = EPERM;
  800                         goto fail;
  801                 }
  802                 break;
  803 
  804         case PT_ATTACH:
  805                 /* Self */
  806                 if (p == td->td_proc) {
  807                         error = EINVAL;
  808                         goto fail;
  809                 }
  810 
  811                 /* Already traced */
  812                 if (p->p_flag & P_TRACED) {
  813                         error = EBUSY;
  814                         goto fail;
  815                 }
  816 
  817                 /* Can't trace an ancestor if you're being traced. */
  818                 if (curp->p_flag & P_TRACED) {
  819                         for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
  820                                 if (pp == p) {
  821                                         error = EINVAL;
  822                                         goto fail;
  823                                 }
  824                         }
  825                 }
  826 
  827 
  828                 /* OK */
  829                 break;
  830 
  831         case PT_CLEARSTEP:
  832                 /* Allow thread to clear single step for itself */
  833                 if (td->td_tid == tid)
  834                         break;
  835 
  836                 /* FALLTHROUGH */
  837         default:
  838                 /* not being traced... */
  839                 if ((p->p_flag & P_TRACED) == 0) {
  840                         error = EPERM;
  841                         goto fail;
  842                 }
  843 
  844                 /* not being traced by YOU */
  845                 if (p->p_pptr != td->td_proc) {
  846                         error = EBUSY;
  847                         goto fail;
  848                 }
  849 
  850                 /* not currently stopped */
  851                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
  852                     p->p_suspcount != p->p_numthreads  ||
  853                     (p->p_flag & P_WAITED) == 0) {
  854                         error = EBUSY;
  855                         goto fail;
  856                 }
  857 
  858                 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
  859                         static int count = 0;
  860                         if (count++ == 0)
  861                                 printf("P_STOPPED_TRACE not set.\n");
  862                 }
  863 
  864                 /* OK */
  865                 break;
  866         }
  867 
  868         /* Keep this process around until we finish this request. */
  869         _PHOLD(p);
  870 
  871 #ifdef FIX_SSTEP
  872         /*
  873          * Single step fixup ala procfs
  874          */
  875         FIX_SSTEP(td2);
  876 #endif
  877 
  878         /*
  879          * Actually do the requests
  880          */
  881 
  882         td->td_retval[0] = 0;
  883 
  884         switch (req) {
  885         case PT_TRACE_ME:
  886                 /* set my trace flag and "owner" so it can read/write me */
  887                 p->p_flag |= P_TRACED;
  888                 if (p->p_flag & P_PPWAIT)
  889                         p->p_flag |= P_PPTRACE;
  890                 p->p_oppid = p->p_pptr->p_pid;
  891                 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
  892                 break;
  893 
  894         case PT_ATTACH:
  895                 /* security check done above */
  896                 /*
  897                  * It would be nice if the tracing relationship was separate
  898                  * from the parent relationship but that would require
  899                  * another set of links in the proc struct or for "wait"
  900                  * to scan the entire proc table.  To make life easier,
  901                  * we just re-parent the process we're trying to trace.
  902                  * The old parent is remembered so we can put things back
  903                  * on a "detach".
  904                  */
  905                 p->p_flag |= P_TRACED;
  906                 p->p_oppid = p->p_pptr->p_pid;
  907                 if (p->p_pptr != td->td_proc) {
  908                         proc_reparent(p, td->td_proc);
  909                 }
  910                 data = SIGSTOP;
  911                 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
  912                     p->p_oppid);
  913                 goto sendsig;   /* in PT_CONTINUE below */
  914 
  915         case PT_CLEARSTEP:
  916                 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
  917                     p->p_pid);
  918                 error = ptrace_clear_single_step(td2);
  919                 break;
  920 
  921         case PT_SETSTEP:
  922                 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
  923                     p->p_pid);
  924                 error = ptrace_single_step(td2);
  925                 break;
  926 
  927         case PT_SUSPEND:
  928                 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
  929                     p->p_pid);
  930                 td2->td_dbgflags |= TDB_SUSPEND;
  931                 thread_lock(td2);
  932                 td2->td_flags |= TDF_NEEDSUSPCHK;
  933                 thread_unlock(td2);
  934                 break;
  935 
  936         case PT_RESUME:
  937                 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
  938                     p->p_pid);
  939                 td2->td_dbgflags &= ~TDB_SUSPEND;
  940                 break;
  941 
  942         case PT_FOLLOW_FORK:
  943                 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
  944                     p->p_flag & P_FOLLOWFORK ? "enabled" : "disabled",
  945                     data ? "enabled" : "disabled");
  946                 if (data)
  947                         p->p_flag |= P_FOLLOWFORK;
  948                 else
  949                         p->p_flag &= ~P_FOLLOWFORK;
  950                 break;
  951 
  952         case PT_LWP_EVENTS:
  953                 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
  954                     p->p_flag2 & P2_LWP_EVENTS ? "enabled" : "disabled",
  955                     data ? "enabled" : "disabled");
  956                 if (data)
  957                         p->p_flag2 |= P2_LWP_EVENTS;
  958                 else
  959                         p->p_flag2 &= ~P2_LWP_EVENTS;
  960                 break;
  961 
  962         case PT_STEP:
  963         case PT_CONTINUE:
  964         case PT_TO_SCE:
  965         case PT_TO_SCX:
  966         case PT_SYSCALL:
  967         case PT_DETACH:
  968                 /* Zero means do not send any signal */
  969                 if (data < 0 || data > _SIG_MAXSIG) {
  970                         error = EINVAL;
  971                         break;
  972                 }
  973 
  974                 switch (req) {
  975                 case PT_STEP:
  976                         CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
  977                             td2->td_tid, p->p_pid);
  978                         error = ptrace_single_step(td2);
  979                         if (error)
  980                                 goto out;
  981                         break;
  982                 case PT_CONTINUE:
  983                 case PT_TO_SCE:
  984                 case PT_TO_SCX:
  985                 case PT_SYSCALL:
  986                         if (addr != (void *)1) {
  987                                 error = ptrace_set_pc(td2,
  988                                     (u_long)(uintfptr_t)addr);
  989                                 if (error)
  990                                         goto out;
  991                         }
  992                         switch (req) {
  993                         case PT_TO_SCE:
  994                                 p->p_stops |= S_PT_SCE;
  995                                 CTR4(KTR_PTRACE,
  996                     "PT_TO_SCE: pid %d, stops = %#x, PC = %#lx, sig = %d",
  997                                     p->p_pid, p->p_stops,
  998                                     (u_long)(uintfptr_t)addr, data);
  999                                 break;
 1000                         case PT_TO_SCX:
 1001                                 p->p_stops |= S_PT_SCX;
 1002                                 CTR4(KTR_PTRACE,
 1003                     "PT_TO_SCX: pid %d, stops = %#x, PC = %#lx, sig = %d",
 1004                                     p->p_pid, p->p_stops,
 1005                                     (u_long)(uintfptr_t)addr, data);
 1006                                 break;
 1007                         case PT_SYSCALL:
 1008                                 p->p_stops |= S_PT_SCE | S_PT_SCX;
 1009                                 CTR4(KTR_PTRACE,
 1010                     "PT_SYSCALL: pid %d, stops = %#x, PC = %#lx, sig = %d",
 1011                                     p->p_pid, p->p_stops,
 1012                                     (u_long)(uintfptr_t)addr, data);
 1013                                 break;
 1014                         case PT_CONTINUE:
 1015                                 CTR3(KTR_PTRACE,
 1016                                     "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
 1017                                     p->p_pid, (u_long)(uintfptr_t)addr, data);
 1018                                 break;
 1019                         }
 1020                         break;
 1021                 case PT_DETACH:
 1022                         /*
 1023                          * Reset the process parent.
 1024                          *
 1025                          * NB: This clears P_TRACED before reparenting
 1026                          * a detached process back to its original
 1027                          * parent.  Otherwise the debugee will be set
 1028                          * as an orphan of the debugger.
 1029                          */
 1030                         p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
 1031                         if (p->p_oppid != p->p_pptr->p_pid) {
 1032                                 PROC_LOCK(p->p_pptr);
 1033                                 sigqueue_take(p->p_ksi);
 1034                                 PROC_UNLOCK(p->p_pptr);
 1035 
 1036                                 pp = proc_realparent(p);
 1037                                 proc_reparent(p, pp);
 1038                                 if (pp == initproc)
 1039                                         p->p_sigparent = SIGCHLD;
 1040                                 CTR3(KTR_PTRACE,
 1041                             "PT_DETACH: pid %d reparented to pid %d, sig %d",
 1042                                     p->p_pid, pp->p_pid, data);
 1043                         } else
 1044                                 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
 1045                                     p->p_pid, data);
 1046                         p->p_oppid = 0;
 1047                         p->p_stops = 0;
 1048 
 1049                         /* should we send SIGCHLD? */
 1050                         /* childproc_continued(p); */
 1051                         break;
 1052                 }
 1053 
 1054         sendsig:
 1055                 if (proctree_locked) {
 1056                         sx_xunlock(&proctree_lock);
 1057                         proctree_locked = 0;
 1058                 }
 1059                 p->p_xsig = data;
 1060                 p->p_xthread = NULL;
 1061                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
 1062                         /* deliver or queue signal */
 1063                         td2->td_dbgflags &= ~TDB_XSIG;
 1064                         td2->td_xsig = data;
 1065 
 1066                         if (req == PT_DETACH) {
 1067                                 FOREACH_THREAD_IN_PROC(p, td3)
 1068                                         td3->td_dbgflags &= ~TDB_SUSPEND; 
 1069                         }
 1070                         /*
 1071                          * unsuspend all threads, to not let a thread run,
 1072                          * you should use PT_SUSPEND to suspend it before
 1073                          * continuing process.
 1074                          */
 1075                         PROC_SLOCK(p);
 1076                         p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
 1077                         thread_unsuspend(p);
 1078                         PROC_SUNLOCK(p);
 1079                         if (req == PT_ATTACH)
 1080                                 kern_psignal(p, data);
 1081                 } else {
 1082                         if (data)
 1083                                 kern_psignal(p, data);
 1084                 }
 1085                 break;
 1086 
 1087         case PT_WRITE_I:
 1088         case PT_WRITE_D:
 1089                 td2->td_dbgflags |= TDB_USERWR;
 1090                 PROC_UNLOCK(p);
 1091                 error = 0;
 1092                 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
 1093                     sizeof(int)) != sizeof(int))
 1094                         error = ENOMEM;
 1095                 else
 1096                         CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
 1097                             p->p_pid, addr, data);
 1098                 PROC_LOCK(p);
 1099                 break;
 1100 
 1101         case PT_READ_I:
 1102         case PT_READ_D:
 1103                 PROC_UNLOCK(p);
 1104                 error = tmp = 0;
 1105                 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
 1106                     sizeof(int)) != sizeof(int))
 1107                         error = ENOMEM;
 1108                 else
 1109                         CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
 1110                             p->p_pid, addr, tmp);
 1111                 td->td_retval[0] = tmp;
 1112                 PROC_LOCK(p);
 1113                 break;
 1114 
 1115         case PT_IO:
 1116 #ifdef COMPAT_FREEBSD32
 1117                 if (wrap32) {
 1118                         piod32 = addr;
 1119                         iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
 1120                         iov.iov_len = piod32->piod_len;
 1121                         uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
 1122                         uio.uio_resid = piod32->piod_len;
 1123                 } else
 1124 #endif
 1125                 {
 1126                         piod = addr;
 1127                         iov.iov_base = piod->piod_addr;
 1128                         iov.iov_len = piod->piod_len;
 1129                         uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
 1130                         uio.uio_resid = piod->piod_len;
 1131                 }
 1132                 uio.uio_iov = &iov;
 1133                 uio.uio_iovcnt = 1;
 1134                 uio.uio_segflg = UIO_USERSPACE;
 1135                 uio.uio_td = td;
 1136 #ifdef COMPAT_FREEBSD32
 1137                 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
 1138 #else
 1139                 tmp = piod->piod_op;
 1140 #endif
 1141                 switch (tmp) {
 1142                 case PIOD_READ_D:
 1143                 case PIOD_READ_I:
 1144                         CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
 1145                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1146                         uio.uio_rw = UIO_READ;
 1147                         break;
 1148                 case PIOD_WRITE_D:
 1149                 case PIOD_WRITE_I:
 1150                         CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
 1151                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1152                         td2->td_dbgflags |= TDB_USERWR;
 1153                         uio.uio_rw = UIO_WRITE;
 1154                         break;
 1155                 default:
 1156                         error = EINVAL;
 1157                         goto out;
 1158                 }
 1159                 PROC_UNLOCK(p);
 1160                 error = proc_rwmem(p, &uio);
 1161 #ifdef COMPAT_FREEBSD32
 1162                 if (wrap32)
 1163                         piod32->piod_len -= uio.uio_resid;
 1164                 else
 1165 #endif
 1166                         piod->piod_len -= uio.uio_resid;
 1167                 PROC_LOCK(p);
 1168                 break;
 1169 
 1170         case PT_KILL:
 1171                 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
 1172                 data = SIGKILL;
 1173                 goto sendsig;   /* in PT_CONTINUE above */
 1174 
 1175         case PT_SETREGS:
 1176                 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
 1177                     p->p_pid);
 1178                 td2->td_dbgflags |= TDB_USERWR;
 1179                 error = PROC_WRITE(regs, td2, addr);
 1180                 break;
 1181 
 1182         case PT_GETREGS:
 1183                 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
 1184                     p->p_pid);
 1185                 error = PROC_READ(regs, td2, addr);
 1186                 break;
 1187 
 1188         case PT_SETFPREGS:
 1189                 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
 1190                     p->p_pid);
 1191                 td2->td_dbgflags |= TDB_USERWR;
 1192                 error = PROC_WRITE(fpregs, td2, addr);
 1193                 break;
 1194 
 1195         case PT_GETFPREGS:
 1196                 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
 1197                     p->p_pid);
 1198                 error = PROC_READ(fpregs, td2, addr);
 1199                 break;
 1200 
 1201         case PT_SETDBREGS:
 1202                 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
 1203                     p->p_pid);
 1204                 td2->td_dbgflags |= TDB_USERWR;
 1205                 error = PROC_WRITE(dbregs, td2, addr);
 1206                 break;
 1207 
 1208         case PT_GETDBREGS:
 1209                 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
 1210                     p->p_pid);
 1211                 error = PROC_READ(dbregs, td2, addr);
 1212                 break;
 1213 
 1214         case PT_LWPINFO:
 1215                 if (data <= 0 ||
 1216 #ifdef COMPAT_FREEBSD32
 1217                     (!wrap32 && data > sizeof(*pl)) ||
 1218                     (wrap32 && data > sizeof(*pl32))) {
 1219 #else
 1220                     data > sizeof(*pl)) {
 1221 #endif
 1222                         error = EINVAL;
 1223                         break;
 1224                 }
 1225 #ifdef COMPAT_FREEBSD32
 1226                 if (wrap32) {
 1227                         pl = &plr;
 1228                         pl32 = addr;
 1229                 } else
 1230 #endif
 1231                 pl = addr;
 1232                 pl->pl_lwpid = td2->td_tid;
 1233                 pl->pl_event = PL_EVENT_NONE;
 1234                 pl->pl_flags = 0;
 1235                 if (td2->td_dbgflags & TDB_XSIG) {
 1236                         pl->pl_event = PL_EVENT_SIGNAL;
 1237                         if (td2->td_dbgksi.ksi_signo != 0 &&
 1238 #ifdef COMPAT_FREEBSD32
 1239                             ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
 1240                             pl_siginfo) + sizeof(pl->pl_siginfo)) ||
 1241                             (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
 1242                             pl_siginfo) + sizeof(struct siginfo32)))
 1243 #else
 1244                             data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
 1245                             + sizeof(pl->pl_siginfo)
 1246 #endif
 1247                         ){
 1248                                 pl->pl_flags |= PL_FLAG_SI;
 1249                                 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
 1250                         }
 1251                 }
 1252                 if ((pl->pl_flags & PL_FLAG_SI) == 0)
 1253                         bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
 1254                 if (td2->td_dbgflags & TDB_SCE)
 1255                         pl->pl_flags |= PL_FLAG_SCE;
 1256                 else if (td2->td_dbgflags & TDB_SCX)
 1257                         pl->pl_flags |= PL_FLAG_SCX;
 1258                 if (td2->td_dbgflags & TDB_EXEC)
 1259                         pl->pl_flags |= PL_FLAG_EXEC;
 1260                 if (td2->td_dbgflags & TDB_FORK) {
 1261                         pl->pl_flags |= PL_FLAG_FORKED;
 1262                         pl->pl_child_pid = td2->td_dbg_forked;
 1263                 }
 1264                 if (td2->td_dbgflags & TDB_CHILD)
 1265                         pl->pl_flags |= PL_FLAG_CHILD;
 1266                 if (td2->td_dbgflags & TDB_BORN)
 1267                         pl->pl_flags |= PL_FLAG_BORN;
 1268                 if (td2->td_dbgflags & TDB_EXIT)
 1269                         pl->pl_flags |= PL_FLAG_EXITED;
 1270                 pl->pl_sigmask = td2->td_sigmask;
 1271                 pl->pl_siglist = td2->td_siglist;
 1272                 strcpy(pl->pl_tdname, td2->td_name);
 1273                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
 1274                         pl->pl_syscall_code = td2->td_dbg_sc_code;
 1275                         pl->pl_syscall_narg = td2->td_dbg_sc_narg;
 1276                 } else {
 1277                         pl->pl_syscall_code = 0;
 1278                         pl->pl_syscall_narg = 0;
 1279                 }
 1280 #ifdef COMPAT_FREEBSD32
 1281                 if (wrap32)
 1282                         ptrace_lwpinfo_to32(pl, pl32);
 1283 #endif
 1284                 CTR6(KTR_PTRACE,
 1285     "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
 1286                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
 1287                     pl->pl_child_pid, pl->pl_syscall_code);
 1288                 break;
 1289 
 1290         case PT_GETNUMLWPS:
 1291                 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
 1292                     p->p_numthreads);
 1293                 td->td_retval[0] = p->p_numthreads;
 1294                 break;
 1295 
 1296         case PT_GETLWPLIST:
 1297                 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
 1298                     p->p_pid, data, p->p_numthreads);
 1299                 if (data <= 0) {
 1300                         error = EINVAL;
 1301                         break;
 1302                 }
 1303                 num = imin(p->p_numthreads, data);
 1304                 PROC_UNLOCK(p);
 1305                 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
 1306                 tmp = 0;
 1307                 PROC_LOCK(p);
 1308                 FOREACH_THREAD_IN_PROC(p, td2) {
 1309                         if (tmp >= num)
 1310                                 break;
 1311                         buf[tmp++] = td2->td_tid;
 1312                 }
 1313                 PROC_UNLOCK(p);
 1314                 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
 1315                 free(buf, M_TEMP);
 1316                 if (!error)
 1317                         td->td_retval[0] = tmp;
 1318                 PROC_LOCK(p);
 1319                 break;
 1320 
 1321         case PT_VM_TIMESTAMP:
 1322                 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
 1323                     p->p_pid, p->p_vmspace->vm_map.timestamp);
 1324                 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
 1325                 break;
 1326 
 1327         case PT_VM_ENTRY:
 1328                 PROC_UNLOCK(p);
 1329 #ifdef COMPAT_FREEBSD32
 1330                 if (wrap32)
 1331                         error = ptrace_vm_entry32(td, p, addr);
 1332                 else
 1333 #endif
 1334                 error = ptrace_vm_entry(td, p, addr);
 1335                 PROC_LOCK(p);
 1336                 break;
 1337 
 1338         default:
 1339 #ifdef __HAVE_PTRACE_MACHDEP
 1340                 if (req >= PT_FIRSTMACH) {
 1341                         PROC_UNLOCK(p);
 1342                         error = cpu_ptrace(td2, req, addr, data);
 1343                         PROC_LOCK(p);
 1344                 } else
 1345 #endif
 1346                         /* Unknown request. */
 1347                         error = EINVAL;
 1348                 break;
 1349         }
 1350 
 1351 out:
 1352         /* Drop our hold on this process now that the request has completed. */
 1353         _PRELE(p);
 1354 fail:
 1355         PROC_UNLOCK(p);
 1356         if (proctree_locked)
 1357                 sx_xunlock(&proctree_lock);
 1358         return (error);
 1359 }
 1360 #undef PROC_READ
 1361 #undef PROC_WRITE
 1362 
 1363 /*
 1364  * Stop a process because of a debugging event;
 1365  * stay stopped until p->p_step is cleared
 1366  * (cleared by PIOCCONT in procfs).
 1367  */
 1368 void
 1369 stopevent(struct proc *p, unsigned int event, unsigned int val)
 1370 {
 1371 
 1372         PROC_LOCK_ASSERT(p, MA_OWNED);
 1373         p->p_step = 1;
 1374         CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
 1375             val);
 1376         do {
 1377                 if (event != S_EXIT)
 1378                         p->p_xsig = val;
 1379                 p->p_xthread = NULL;
 1380                 p->p_stype = event;     /* Which event caused the stop? */
 1381                 wakeup(&p->p_stype);    /* Wake up any PIOCWAIT'ing procs */
 1382                 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
 1383         } while (p->p_step);
 1384 }

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