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: stable/9/sys/kern/sys_process.c 290464 2015-11-06 20:10:54Z 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/priv.h>
   45 #include <sys/proc.h>
   46 #include <sys/procctl.h>
   47 #include <sys/vnode.h>
   48 #include <sys/ptrace.h>
   49 #include <sys/sx.h>
   50 #include <sys/malloc.h>
   51 #include <sys/signalvar.h>
   52 
   53 #include <machine/reg.h>
   54 
   55 #include <security/audit/audit.h>
   56 
   57 #include <vm/vm.h>
   58 #include <vm/pmap.h>
   59 #include <vm/vm_extern.h>
   60 #include <vm/vm_map.h>
   61 #include <vm/vm_kern.h>
   62 #include <vm/vm_object.h>
   63 #include <vm/vm_page.h>
   64 #include <vm/vm_pager.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         KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
  255             p, p->p_pid));
  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 int
  332 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
  333 {
  334         struct vattr vattr;
  335         vm_map_t map;
  336         vm_map_entry_t entry;
  337         vm_object_t obj, tobj, lobj;
  338         struct vmspace *vm;
  339         struct vnode *vp;
  340         char *freepath, *fullpath;
  341         u_int pathlen;
  342         int error, index, vfslocked;
  343 
  344         error = 0;
  345         obj = NULL;
  346 
  347         vm = vmspace_acquire_ref(p);
  348         map = &vm->vm_map;
  349         vm_map_lock_read(map);
  350 
  351         do {
  352                 entry = map->header.next;
  353                 index = 0;
  354                 while (index < pve->pve_entry && entry != &map->header) {
  355                         entry = entry->next;
  356                         index++;
  357                 }
  358                 if (index != pve->pve_entry) {
  359                         error = EINVAL;
  360                         break;
  361                 }
  362                 while (entry != &map->header &&
  363                     (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
  364                         entry = entry->next;
  365                         index++;
  366                 }
  367                 if (entry == &map->header) {
  368                         error = ENOENT;
  369                         break;
  370                 }
  371 
  372                 /* We got an entry. */
  373                 pve->pve_entry = index + 1;
  374                 pve->pve_timestamp = map->timestamp;
  375                 pve->pve_start = entry->start;
  376                 pve->pve_end = entry->end - 1;
  377                 pve->pve_offset = entry->offset;
  378                 pve->pve_prot = entry->protection;
  379 
  380                 /* Backing object's path needed? */
  381                 if (pve->pve_pathlen == 0)
  382                         break;
  383 
  384                 pathlen = pve->pve_pathlen;
  385                 pve->pve_pathlen = 0;
  386 
  387                 obj = entry->object.vm_object;
  388                 if (obj != NULL)
  389                         VM_OBJECT_LOCK(obj);
  390         } while (0);
  391 
  392         vm_map_unlock_read(map);
  393         vmspace_free(vm);
  394 
  395         pve->pve_fsid = VNOVAL;
  396         pve->pve_fileid = VNOVAL;
  397 
  398         if (error == 0 && obj != NULL) {
  399                 lobj = obj;
  400                 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
  401                         if (tobj != obj)
  402                                 VM_OBJECT_LOCK(tobj);
  403                         if (lobj != obj)
  404                                 VM_OBJECT_UNLOCK(lobj);
  405                         lobj = tobj;
  406                         pve->pve_offset += tobj->backing_object_offset;
  407                 }
  408                 vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL;
  409                 if (vp != NULL)
  410                         vref(vp);
  411                 if (lobj != obj)
  412                         VM_OBJECT_UNLOCK(lobj);
  413                 VM_OBJECT_UNLOCK(obj);
  414 
  415                 if (vp != NULL) {
  416                         freepath = NULL;
  417                         fullpath = NULL;
  418                         vn_fullpath(td, vp, &fullpath, &freepath);
  419                         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  420                         vn_lock(vp, LK_SHARED | LK_RETRY);
  421                         if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
  422                                 pve->pve_fileid = vattr.va_fileid;
  423                                 pve->pve_fsid = vattr.va_fsid;
  424                         }
  425                         vput(vp);
  426                         VFS_UNLOCK_GIANT(vfslocked);
  427 
  428                         if (fullpath != NULL) {
  429                                 pve->pve_pathlen = strlen(fullpath) + 1;
  430                                 if (pve->pve_pathlen <= pathlen) {
  431                                         error = copyout(fullpath, pve->pve_path,
  432                                             pve->pve_pathlen);
  433                                 } else
  434                                         error = ENAMETOOLONG;
  435                         }
  436                         if (freepath != NULL)
  437                                 free(freepath, M_TEMP);
  438                 }
  439         }
  440         if (error == 0)
  441                 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
  442                     p->p_pid, pve->pve_entry, pve->pve_start);
  443 
  444         return (error);
  445 }
  446 
  447 #ifdef COMPAT_FREEBSD32
  448 static int      
  449 ptrace_vm_entry32(struct thread *td, struct proc *p,
  450     struct ptrace_vm_entry32 *pve32)
  451 {
  452         struct ptrace_vm_entry pve;
  453         int error;
  454 
  455         pve.pve_entry = pve32->pve_entry;
  456         pve.pve_pathlen = pve32->pve_pathlen;
  457         pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
  458 
  459         error = ptrace_vm_entry(td, p, &pve);
  460         if (error == 0) {
  461                 pve32->pve_entry = pve.pve_entry;
  462                 pve32->pve_timestamp = pve.pve_timestamp;
  463                 pve32->pve_start = pve.pve_start;
  464                 pve32->pve_end = pve.pve_end;
  465                 pve32->pve_offset = pve.pve_offset;
  466                 pve32->pve_prot = pve.pve_prot;
  467                 pve32->pve_fileid = pve.pve_fileid;
  468                 pve32->pve_fsid = pve.pve_fsid;
  469         }
  470 
  471         pve32->pve_pathlen = pve.pve_pathlen;
  472         return (error);
  473 }
  474 
  475 static void
  476 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
  477     struct ptrace_lwpinfo32 *pl32)
  478 {
  479 
  480         pl32->pl_lwpid = pl->pl_lwpid;
  481         pl32->pl_event = pl->pl_event;
  482         pl32->pl_flags = pl->pl_flags;
  483         pl32->pl_sigmask = pl->pl_sigmask;
  484         pl32->pl_siglist = pl->pl_siglist;
  485         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
  486         strcpy(pl32->pl_tdname, pl->pl_tdname);
  487         pl32->pl_child_pid = pl->pl_child_pid;
  488         pl32->pl_syscall_code = pl->pl_syscall_code;
  489         pl32->pl_syscall_narg = pl->pl_syscall_narg;
  490 }
  491 #endif /* COMPAT_FREEBSD32 */
  492 
  493 /*
  494  * Process debugging system call.
  495  */
  496 #ifndef _SYS_SYSPROTO_H_
  497 struct ptrace_args {
  498         int     req;
  499         pid_t   pid;
  500         caddr_t addr;
  501         int     data;
  502 };
  503 #endif
  504 
  505 #ifdef COMPAT_FREEBSD32
  506 /*
  507  * This CPP subterfuge is to try and reduce the number of ifdefs in
  508  * the body of the code.
  509  *   COPYIN(uap->addr, &r.reg, sizeof r.reg);
  510  * becomes either:
  511  *   copyin(uap->addr, &r.reg, sizeof r.reg);
  512  * or
  513  *   copyin(uap->addr, &r.reg32, sizeof r.reg32);
  514  * .. except this is done at runtime.
  515  */
  516 #define COPYIN(u, k, s)         wrap32 ? \
  517         copyin(u, k ## 32, s ## 32) : \
  518         copyin(u, k, s)
  519 #define COPYOUT(k, u, s)        wrap32 ? \
  520         copyout(k ## 32, u, s ## 32) : \
  521         copyout(k, u, s)
  522 #else
  523 #define COPYIN(u, k, s)         copyin(u, k, s)
  524 #define COPYOUT(k, u, s)        copyout(k, u, s)
  525 #endif
  526 int
  527 sys_ptrace(struct thread *td, struct ptrace_args *uap)
  528 {
  529         /*
  530          * XXX this obfuscation is to reduce stack usage, but the register
  531          * structs may be too large to put on the stack anyway.
  532          */
  533         union {
  534                 struct ptrace_io_desc piod;
  535                 struct ptrace_lwpinfo pl;
  536                 struct ptrace_vm_entry pve;
  537                 struct dbreg dbreg;
  538                 struct fpreg fpreg;
  539                 struct reg reg;
  540 #ifdef COMPAT_FREEBSD32
  541                 struct dbreg32 dbreg32;
  542                 struct fpreg32 fpreg32;
  543                 struct reg32 reg32;
  544                 struct ptrace_io_desc32 piod32;
  545                 struct ptrace_lwpinfo32 pl32;
  546                 struct ptrace_vm_entry32 pve32;
  547 #endif
  548         } r;
  549         void *addr;
  550         int error = 0;
  551 #ifdef COMPAT_FREEBSD32
  552         int wrap32 = 0;
  553 
  554         if (SV_CURPROC_FLAG(SV_ILP32))
  555                 wrap32 = 1;
  556 #endif
  557         AUDIT_ARG_PID(uap->pid);
  558         AUDIT_ARG_CMD(uap->req);
  559         AUDIT_ARG_VALUE(uap->data);
  560         addr = &r;
  561         switch (uap->req) {
  562         case PT_GETREGS:
  563         case PT_GETFPREGS:
  564         case PT_GETDBREGS:
  565         case PT_LWPINFO:
  566                 break;
  567         case PT_SETREGS:
  568                 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
  569                 break;
  570         case PT_SETFPREGS:
  571                 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
  572                 break;
  573         case PT_SETDBREGS:
  574                 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
  575                 break;
  576         case PT_IO:
  577                 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
  578                 break;
  579         case PT_VM_ENTRY:
  580                 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
  581                 break;
  582         default:
  583                 addr = uap->addr;
  584                 break;
  585         }
  586         if (error)
  587                 return (error);
  588 
  589         error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
  590         if (error)
  591                 return (error);
  592 
  593         switch (uap->req) {
  594         case PT_VM_ENTRY:
  595                 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
  596                 break;
  597         case PT_IO:
  598                 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
  599                 break;
  600         case PT_GETREGS:
  601                 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
  602                 break;
  603         case PT_GETFPREGS:
  604                 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
  605                 break;
  606         case PT_GETDBREGS:
  607                 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
  608                 break;
  609         case PT_LWPINFO:
  610                 error = copyout(&r.pl, uap->addr, uap->data);
  611                 break;
  612         }
  613 
  614         return (error);
  615 }
  616 #undef COPYIN
  617 #undef COPYOUT
  618 
  619 #ifdef COMPAT_FREEBSD32
  620 /*
  621  *   PROC_READ(regs, td2, addr);
  622  * becomes either:
  623  *   proc_read_regs(td2, addr);
  624  * or
  625  *   proc_read_regs32(td2, addr);
  626  * .. except this is done at runtime.  There is an additional
  627  * complication in that PROC_WRITE disallows 32 bit consumers
  628  * from writing to 64 bit address space targets.
  629  */
  630 #define PROC_READ(w, t, a)      wrap32 ? \
  631         proc_read_ ## w ## 32(t, a) : \
  632         proc_read_ ## w (t, a)
  633 #define PROC_WRITE(w, t, a)     wrap32 ? \
  634         (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
  635         proc_write_ ## w (t, a)
  636 #else
  637 #define PROC_READ(w, t, a)      proc_read_ ## w (t, a)
  638 #define PROC_WRITE(w, t, a)     proc_write_ ## w (t, a)
  639 #endif
  640 
  641 int
  642 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
  643 {
  644         struct iovec iov;
  645         struct uio uio;
  646         struct proc *curp, *p, *pp;
  647         struct thread *td2 = NULL;
  648         struct ptrace_io_desc *piod = NULL;
  649         struct ptrace_lwpinfo *pl;
  650         int error, write, tmp, num;
  651         int proctree_locked = 0;
  652         lwpid_t tid = 0, *buf;
  653 #ifdef COMPAT_FREEBSD32
  654         int wrap32 = 0, safe = 0;
  655         struct ptrace_io_desc32 *piod32 = NULL;
  656         struct ptrace_lwpinfo32 *pl32 = NULL;
  657         struct ptrace_lwpinfo plr;
  658 #endif
  659 
  660         curp = td->td_proc;
  661 
  662         /* Lock proctree before locking the process. */
  663         switch (req) {
  664         case PT_TRACE_ME:
  665         case PT_ATTACH:
  666         case PT_STEP:
  667         case PT_CONTINUE:
  668         case PT_TO_SCE:
  669         case PT_TO_SCX:
  670         case PT_SYSCALL:
  671         case PT_FOLLOW_FORK:
  672         case PT_DETACH:
  673                 sx_xlock(&proctree_lock);
  674                 proctree_locked = 1;
  675                 break;
  676         default:
  677                 break;
  678         }
  679 
  680         write = 0;
  681         if (req == PT_TRACE_ME) {
  682                 p = td->td_proc;
  683                 PROC_LOCK(p);
  684         } else {
  685                 if (pid <= PID_MAX) {
  686                         if ((p = pfind(pid)) == NULL) {
  687                                 if (proctree_locked)
  688                                         sx_xunlock(&proctree_lock);
  689                                 return (ESRCH);
  690                         }
  691                 } else {
  692                         td2 = tdfind(pid, -1);
  693                         if (td2 == NULL) {
  694                                 if (proctree_locked)
  695                                         sx_xunlock(&proctree_lock);
  696                                 return (ESRCH);
  697                         }
  698                         p = td2->td_proc;
  699                         tid = pid;
  700                         pid = p->p_pid;
  701                 }
  702         }
  703         AUDIT_ARG_PROCESS(p);
  704 
  705         if ((p->p_flag & P_WEXIT) != 0) {
  706                 error = ESRCH;
  707                 goto fail;
  708         }
  709         if ((error = p_cansee(td, p)) != 0)
  710                 goto fail;
  711 
  712         if ((error = p_candebug(td, p)) != 0)
  713                 goto fail;
  714 
  715         /*
  716          * System processes can't be debugged.
  717          */
  718         if ((p->p_flag & P_SYSTEM) != 0) {
  719                 error = EINVAL;
  720                 goto fail;
  721         }
  722 
  723         if (tid == 0) {
  724                 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
  725                         KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
  726                         td2 = p->p_xthread;
  727                 } else {
  728                         td2 = FIRST_THREAD_IN_PROC(p);
  729                 }
  730                 tid = td2->td_tid;
  731         }
  732 
  733 #ifdef COMPAT_FREEBSD32
  734         /*
  735          * Test if we're a 32 bit client and what the target is.
  736          * Set the wrap controls accordingly.
  737          */
  738         if (SV_CURPROC_FLAG(SV_ILP32)) {
  739                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
  740                         safe = 1;
  741                 wrap32 = 1;
  742         }
  743 #endif
  744         /*
  745          * Permissions check
  746          */
  747         switch (req) {
  748         case PT_TRACE_ME:
  749                 /* Always legal. */
  750                 break;
  751 
  752         case PT_ATTACH:
  753                 /* Self */
  754                 if (p->p_pid == td->td_proc->p_pid) {
  755                         error = EINVAL;
  756                         goto fail;
  757                 }
  758 
  759                 /* Already traced */
  760                 if (p->p_flag & P_TRACED) {
  761                         error = EBUSY;
  762                         goto fail;
  763                 }
  764 
  765                 /* Can't trace an ancestor if you're being traced. */
  766                 if (curp->p_flag & P_TRACED) {
  767                         for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
  768                                 if (pp == p) {
  769                                         error = EINVAL;
  770                                         goto fail;
  771                                 }
  772                         }
  773                 }
  774 
  775 
  776                 /* OK */
  777                 break;
  778 
  779         case PT_CLEARSTEP:
  780                 /* Allow thread to clear single step for itself */
  781                 if (td->td_tid == tid)
  782                         break;
  783 
  784                 /* FALLTHROUGH */
  785         default:
  786                 /* not being traced... */
  787                 if ((p->p_flag & P_TRACED) == 0) {
  788                         error = EPERM;
  789                         goto fail;
  790                 }
  791 
  792                 /* not being traced by YOU */
  793                 if (p->p_pptr != td->td_proc) {
  794                         error = EBUSY;
  795                         goto fail;
  796                 }
  797 
  798                 /* not currently stopped */
  799                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
  800                     p->p_suspcount != p->p_numthreads  ||
  801                     (p->p_flag & P_WAITED) == 0) {
  802                         error = EBUSY;
  803                         goto fail;
  804                 }
  805 
  806                 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
  807                         static int count = 0;
  808                         if (count++ == 0)
  809                                 printf("P_STOPPED_TRACE not set.\n");
  810                 }
  811 
  812                 /* OK */
  813                 break;
  814         }
  815 
  816         /* Keep this process around until we finish this request. */
  817         _PHOLD(p);
  818 
  819 #ifdef FIX_SSTEP
  820         /*
  821          * Single step fixup ala procfs
  822          */
  823         FIX_SSTEP(td2);
  824 #endif
  825 
  826         /*
  827          * Actually do the requests
  828          */
  829 
  830         td->td_retval[0] = 0;
  831 
  832         switch (req) {
  833         case PT_TRACE_ME:
  834                 /* set my trace flag and "owner" so it can read/write me */
  835                 p->p_flag |= P_TRACED;
  836                 if (p->p_flag & P_PPWAIT)
  837                         p->p_flag |= P_PPTRACE;
  838                 p->p_oppid = p->p_pptr->p_pid;
  839                 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
  840                 break;
  841 
  842         case PT_ATTACH:
  843                 /* security check done above */
  844                 /*
  845                  * It would be nice if the tracing relationship was separate
  846                  * from the parent relationship but that would require
  847                  * another set of links in the proc struct or for "wait"
  848                  * to scan the entire proc table.  To make life easier,
  849                  * we just re-parent the process we're trying to trace.
  850                  * The old parent is remembered so we can put things back
  851                  * on a "detach".
  852                  */
  853                 p->p_flag |= P_TRACED;
  854                 p->p_oppid = p->p_pptr->p_pid;
  855                 if (p->p_pptr != td->td_proc) {
  856                         proc_reparent(p, td->td_proc);
  857                 }
  858                 data = SIGSTOP;
  859                 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
  860                     p->p_oppid);
  861                 goto sendsig;   /* in PT_CONTINUE below */
  862 
  863         case PT_CLEARSTEP:
  864                 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
  865                     p->p_pid);
  866                 error = ptrace_clear_single_step(td2);
  867                 break;
  868 
  869         case PT_SETSTEP:
  870                 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
  871                     p->p_pid);
  872                 error = ptrace_single_step(td2);
  873                 break;
  874 
  875         case PT_SUSPEND:
  876                 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
  877                     p->p_pid);
  878                 td2->td_dbgflags |= TDB_SUSPEND;
  879                 thread_lock(td2);
  880                 td2->td_flags |= TDF_NEEDSUSPCHK;
  881                 thread_unlock(td2);
  882                 break;
  883 
  884         case PT_RESUME:
  885                 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
  886                     p->p_pid);
  887                 td2->td_dbgflags &= ~TDB_SUSPEND;
  888                 break;
  889 
  890         case PT_FOLLOW_FORK:
  891                 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
  892                     p->p_flag & P_FOLLOWFORK ? "enabled" : "disabled",
  893                     data ? "enabled" : "disabled");
  894                 if (data)
  895                         p->p_flag |= P_FOLLOWFORK;
  896                 else
  897                         p->p_flag &= ~P_FOLLOWFORK;
  898                 break;
  899 
  900         case PT_STEP:
  901         case PT_CONTINUE:
  902         case PT_TO_SCE:
  903         case PT_TO_SCX:
  904         case PT_SYSCALL:
  905         case PT_DETACH:
  906                 /* Zero means do not send any signal */
  907                 if (data < 0 || data > _SIG_MAXSIG) {
  908                         error = EINVAL;
  909                         break;
  910                 }
  911 
  912                 switch (req) {
  913                 case PT_STEP:
  914                         CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
  915                             td2->td_tid, p->p_pid);
  916                         error = ptrace_single_step(td2);
  917                         if (error)
  918                                 goto out;
  919                         break;
  920                 case PT_CONTINUE:
  921                 case PT_TO_SCE:
  922                 case PT_TO_SCX:
  923                 case PT_SYSCALL:
  924                         if (addr != (void *)1) {
  925                                 error = ptrace_set_pc(td2,
  926                                     (u_long)(uintfptr_t)addr);
  927                                 if (error)
  928                                         goto out;
  929                         }
  930                         switch (req) {
  931                         case PT_TO_SCE:
  932                                 p->p_stops |= S_PT_SCE;
  933                                 CTR4(KTR_PTRACE,
  934                     "PT_TO_SCE: pid %d, stops = %#x, PC = %#lx, sig = %d",
  935                                     p->p_pid, p->p_stops,
  936                                     (u_long)(uintfptr_t)addr, data);
  937                                 break;
  938                         case PT_TO_SCX:
  939                                 p->p_stops |= S_PT_SCX;
  940                                 CTR4(KTR_PTRACE,
  941                     "PT_TO_SCX: pid %d, stops = %#x, PC = %#lx, sig = %d",
  942                                     p->p_pid, p->p_stops,
  943                                     (u_long)(uintfptr_t)addr, data);
  944                                 break;
  945                         case PT_SYSCALL:
  946                                 p->p_stops |= S_PT_SCE | S_PT_SCX;
  947                                 CTR4(KTR_PTRACE,
  948                     "PT_SYSCALL: pid %d, stops = %#x, PC = %#lx, sig = %d",
  949                                     p->p_pid, p->p_stops,
  950                                     (u_long)(uintfptr_t)addr, data);
  951                                 break;
  952                         case PT_CONTINUE:
  953                                 CTR3(KTR_PTRACE,
  954                                     "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
  955                                     p->p_pid, (u_long)(uintfptr_t)addr, data);
  956                                 break;
  957                         }
  958                         break;
  959                 case PT_DETACH:
  960                         /*
  961                          * Reset the process parent.
  962                          *
  963                          * NB: This clears P_TRACED before reparenting
  964                          * a detached process back to its original
  965                          * parent.  Otherwise the debugee will be set
  966                          * as an orphan of the debugger.
  967                          */
  968                         p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
  969                         if (p->p_oppid != p->p_pptr->p_pid) {
  970                                 PROC_LOCK(p->p_pptr);
  971                                 sigqueue_take(p->p_ksi);
  972                                 PROC_UNLOCK(p->p_pptr);
  973 
  974                                 pp = proc_realparent(p);
  975                                 proc_reparent(p, pp);
  976                                 if (pp == initproc)
  977                                         p->p_sigparent = SIGCHLD;
  978                                 CTR3(KTR_PTRACE,
  979                             "PT_DETACH: pid %d reparented to pid %d, sig %d",
  980                                     p->p_pid, pp->p_pid, data);
  981                         } else
  982                                 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
  983                                     p->p_pid, data);
  984                         p->p_oppid = 0;
  985 
  986                         /* should we send SIGCHLD? */
  987                         /* childproc_continued(p); */
  988                         break;
  989                 }
  990 
  991         sendsig:
  992                 if (proctree_locked) {
  993                         sx_xunlock(&proctree_lock);
  994                         proctree_locked = 0;
  995                 }
  996                 p->p_xstat = data;
  997                 p->p_xthread = NULL;
  998                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
  999                         /* deliver or queue signal */
 1000                         td2->td_dbgflags &= ~TDB_XSIG;
 1001                         td2->td_xsig = data;
 1002 
 1003                         if (req == PT_DETACH) {
 1004                                 struct thread *td3;
 1005                                 FOREACH_THREAD_IN_PROC(p, td3) {
 1006                                         td3->td_dbgflags &= ~TDB_SUSPEND; 
 1007                                 }
 1008                         }
 1009                         /*
 1010                          * unsuspend all threads, to not let a thread run,
 1011                          * you should use PT_SUSPEND to suspend it before
 1012                          * continuing process.
 1013                          */
 1014                         PROC_SLOCK(p);
 1015                         p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
 1016                         thread_unsuspend(p);
 1017                         PROC_SUNLOCK(p);
 1018                 } else {
 1019                         if (data)
 1020                                 kern_psignal(p, data);
 1021                 }
 1022                 break;
 1023 
 1024         case PT_WRITE_I:
 1025         case PT_WRITE_D:
 1026                 td2->td_dbgflags |= TDB_USERWR;
 1027                 write = 1;
 1028                 /* FALLTHROUGH */
 1029         case PT_READ_I:
 1030         case PT_READ_D:
 1031                 PROC_UNLOCK(p);
 1032                 tmp = 0;
 1033                 /* write = 0 set above */
 1034                 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
 1035                 iov.iov_len = sizeof(int);
 1036                 uio.uio_iov = &iov;
 1037                 uio.uio_iovcnt = 1;
 1038                 uio.uio_offset = (off_t)(uintptr_t)addr;
 1039                 uio.uio_resid = sizeof(int);
 1040                 uio.uio_segflg = UIO_SYSSPACE;  /* i.e.: the uap */
 1041                 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
 1042                 uio.uio_td = td;
 1043                 error = proc_rwmem(p, &uio);
 1044                 if (uio.uio_resid != 0) {
 1045                         /*
 1046                          * XXX proc_rwmem() doesn't currently return ENOSPC,
 1047                          * so I think write() can bogusly return 0.
 1048                          * XXX what happens for short writes?  We don't want
 1049                          * to write partial data.
 1050                          * XXX proc_rwmem() returns EPERM for other invalid
 1051                          * addresses.  Convert this to EINVAL.  Does this
 1052                          * clobber returns of EPERM for other reasons?
 1053                          */
 1054                         if (error == 0 || error == ENOSPC || error == EPERM)
 1055                                 error = EINVAL; /* EOF */
 1056                 }
 1057                 if (!write)
 1058                         td->td_retval[0] = tmp;
 1059                 if (error == 0) {
 1060                         if (write)
 1061                                 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
 1062                                     p->p_pid, addr, data);
 1063                         else
 1064                                 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
 1065                                     p->p_pid, addr, tmp);
 1066                 }
 1067                 PROC_LOCK(p);
 1068                 break;
 1069 
 1070         case PT_IO:
 1071 #ifdef COMPAT_FREEBSD32
 1072                 if (wrap32) {
 1073                         piod32 = addr;
 1074                         iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
 1075                         iov.iov_len = piod32->piod_len;
 1076                         uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
 1077                         uio.uio_resid = piod32->piod_len;
 1078                 } else
 1079 #endif
 1080                 {
 1081                         piod = addr;
 1082                         iov.iov_base = piod->piod_addr;
 1083                         iov.iov_len = piod->piod_len;
 1084                         uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
 1085                         uio.uio_resid = piod->piod_len;
 1086                 }
 1087                 uio.uio_iov = &iov;
 1088                 uio.uio_iovcnt = 1;
 1089                 uio.uio_segflg = UIO_USERSPACE;
 1090                 uio.uio_td = td;
 1091 #ifdef COMPAT_FREEBSD32
 1092                 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
 1093 #else
 1094                 tmp = piod->piod_op;
 1095 #endif
 1096                 switch (tmp) {
 1097                 case PIOD_READ_D:
 1098                 case PIOD_READ_I:
 1099                         CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
 1100                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1101                         uio.uio_rw = UIO_READ;
 1102                         break;
 1103                 case PIOD_WRITE_D:
 1104                 case PIOD_WRITE_I:
 1105                         CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
 1106                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1107                         td2->td_dbgflags |= TDB_USERWR;
 1108                         uio.uio_rw = UIO_WRITE;
 1109                         break;
 1110                 default:
 1111                         error = EINVAL;
 1112                         goto out;
 1113                 }
 1114                 PROC_UNLOCK(p);
 1115                 error = proc_rwmem(p, &uio);
 1116 #ifdef COMPAT_FREEBSD32
 1117                 if (wrap32)
 1118                         piod32->piod_len -= uio.uio_resid;
 1119                 else
 1120 #endif
 1121                         piod->piod_len -= uio.uio_resid;
 1122                 PROC_LOCK(p);
 1123                 break;
 1124 
 1125         case PT_KILL:
 1126                 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
 1127                 data = SIGKILL;
 1128                 goto sendsig;   /* in PT_CONTINUE above */
 1129 
 1130         case PT_SETREGS:
 1131                 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
 1132                     p->p_pid);
 1133                 td2->td_dbgflags |= TDB_USERWR;
 1134                 error = PROC_WRITE(regs, td2, addr);
 1135                 break;
 1136 
 1137         case PT_GETREGS:
 1138                 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
 1139                     p->p_pid);
 1140                 error = PROC_READ(regs, td2, addr);
 1141                 break;
 1142 
 1143         case PT_SETFPREGS:
 1144                 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
 1145                     p->p_pid);
 1146                 td2->td_dbgflags |= TDB_USERWR;
 1147                 error = PROC_WRITE(fpregs, td2, addr);
 1148                 break;
 1149 
 1150         case PT_GETFPREGS:
 1151                 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
 1152                     p->p_pid);
 1153                 error = PROC_READ(fpregs, td2, addr);
 1154                 break;
 1155 
 1156         case PT_SETDBREGS:
 1157                 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
 1158                     p->p_pid);
 1159                 td2->td_dbgflags |= TDB_USERWR;
 1160                 error = PROC_WRITE(dbregs, td2, addr);
 1161                 break;
 1162 
 1163         case PT_GETDBREGS:
 1164                 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
 1165                     p->p_pid);
 1166                 error = PROC_READ(dbregs, td2, addr);
 1167                 break;
 1168 
 1169         case PT_LWPINFO:
 1170                 if (data <= 0 ||
 1171 #ifdef COMPAT_FREEBSD32
 1172                     (!wrap32 && data > sizeof(*pl)) ||
 1173                     (wrap32 && data > sizeof(*pl32))) {
 1174 #else
 1175                     data > sizeof(*pl)) {
 1176 #endif
 1177                         error = EINVAL;
 1178                         break;
 1179                 }
 1180 #ifdef COMPAT_FREEBSD32
 1181                 if (wrap32) {
 1182                         pl = &plr;
 1183                         pl32 = addr;
 1184                 } else
 1185 #endif
 1186                 pl = addr;
 1187                 pl->pl_lwpid = td2->td_tid;
 1188                 pl->pl_event = PL_EVENT_NONE;
 1189                 pl->pl_flags = 0;
 1190                 if (td2->td_dbgflags & TDB_XSIG) {
 1191                         pl->pl_event = PL_EVENT_SIGNAL;
 1192                         if (td2->td_dbgksi.ksi_signo != 0 &&
 1193 #ifdef COMPAT_FREEBSD32
 1194                             ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
 1195                             pl_siginfo) + sizeof(pl->pl_siginfo)) ||
 1196                             (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
 1197                             pl_siginfo) + sizeof(struct siginfo32)))
 1198 #else
 1199                             data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
 1200                             + sizeof(pl->pl_siginfo)
 1201 #endif
 1202                         ){
 1203                                 pl->pl_flags |= PL_FLAG_SI;
 1204                                 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
 1205                         }
 1206                 }
 1207                 if ((pl->pl_flags & PL_FLAG_SI) == 0)
 1208                         bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
 1209                 if (td2->td_dbgflags & TDB_SCE)
 1210                         pl->pl_flags |= PL_FLAG_SCE;
 1211                 else if (td2->td_dbgflags & TDB_SCX)
 1212                         pl->pl_flags |= PL_FLAG_SCX;
 1213                 if (td2->td_dbgflags & TDB_EXEC)
 1214                         pl->pl_flags |= PL_FLAG_EXEC;
 1215                 if (td2->td_dbgflags & TDB_FORK) {
 1216                         pl->pl_flags |= PL_FLAG_FORKED;
 1217                         pl->pl_child_pid = td2->td_dbg_forked;
 1218                 }
 1219                 if (td2->td_dbgflags & TDB_CHILD)
 1220                         pl->pl_flags |= PL_FLAG_CHILD;
 1221                 pl->pl_sigmask = td2->td_sigmask;
 1222                 pl->pl_siglist = td2->td_siglist;
 1223                 strcpy(pl->pl_tdname, td2->td_name);
 1224                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
 1225                         pl->pl_syscall_code = td2->td_dbg_sc_code;
 1226                         pl->pl_syscall_narg = td2->td_dbg_sc_narg;
 1227                 } else {
 1228                         pl->pl_syscall_code = 0;
 1229                         pl->pl_syscall_narg = 0;
 1230                 }
 1231 #ifdef COMPAT_FREEBSD32
 1232                 if (wrap32)
 1233                         ptrace_lwpinfo_to32(pl, pl32);
 1234 #endif
 1235                 CTR6(KTR_PTRACE,
 1236     "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
 1237                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
 1238                     pl->pl_child_pid, pl->pl_syscall_code);
 1239                 break;
 1240 
 1241         case PT_GETNUMLWPS:
 1242                 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
 1243                     p->p_numthreads);
 1244                 td->td_retval[0] = p->p_numthreads;
 1245                 break;
 1246 
 1247         case PT_GETLWPLIST:
 1248                 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
 1249                     p->p_pid, data, p->p_numthreads);
 1250                 if (data <= 0) {
 1251                         error = EINVAL;
 1252                         break;
 1253                 }
 1254                 num = imin(p->p_numthreads, data);
 1255                 PROC_UNLOCK(p);
 1256                 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
 1257                 tmp = 0;
 1258                 PROC_LOCK(p);
 1259                 FOREACH_THREAD_IN_PROC(p, td2) {
 1260                         if (tmp >= num)
 1261                                 break;
 1262                         buf[tmp++] = td2->td_tid;
 1263                 }
 1264                 PROC_UNLOCK(p);
 1265                 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
 1266                 free(buf, M_TEMP);
 1267                 if (!error)
 1268                         td->td_retval[0] = tmp;
 1269                 PROC_LOCK(p);
 1270                 break;
 1271 
 1272         case PT_VM_TIMESTAMP:
 1273                 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
 1274                     p->p_pid, p->p_vmspace->vm_map.timestamp);
 1275                 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
 1276                 break;
 1277 
 1278         case PT_VM_ENTRY:
 1279                 PROC_UNLOCK(p);
 1280 #ifdef COMPAT_FREEBSD32
 1281                 if (wrap32)
 1282                         error = ptrace_vm_entry32(td, p, addr);
 1283                 else
 1284 #endif
 1285                 error = ptrace_vm_entry(td, p, addr);
 1286                 PROC_LOCK(p);
 1287                 break;
 1288 
 1289         default:
 1290 #ifdef __HAVE_PTRACE_MACHDEP
 1291                 if (req >= PT_FIRSTMACH) {
 1292                         PROC_UNLOCK(p);
 1293                         error = cpu_ptrace(td2, req, addr, data);
 1294                         PROC_LOCK(p);
 1295                 } else
 1296 #endif
 1297                         /* Unknown request. */
 1298                         error = EINVAL;
 1299                 break;
 1300         }
 1301 
 1302 out:
 1303         /* Drop our hold on this process now that the request has completed. */
 1304         _PRELE(p);
 1305 fail:
 1306         PROC_UNLOCK(p);
 1307         if (proctree_locked)
 1308                 sx_xunlock(&proctree_lock);
 1309         return (error);
 1310 }
 1311 #undef PROC_READ
 1312 #undef PROC_WRITE
 1313 
 1314 /*
 1315  * Stop a process because of a debugging event;
 1316  * stay stopped until p->p_step is cleared
 1317  * (cleared by PIOCCONT in procfs).
 1318  */
 1319 void
 1320 stopevent(struct proc *p, unsigned int event, unsigned int val)
 1321 {
 1322 
 1323         PROC_LOCK_ASSERT(p, MA_OWNED);
 1324         p->p_step = 1;
 1325         CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
 1326             val);
 1327         do {
 1328                 p->p_xstat = val;
 1329                 p->p_xthread = NULL;
 1330                 p->p_stype = event;     /* Which event caused the stop? */
 1331                 wakeup(&p->p_stype);    /* Wake up any PIOCWAIT'ing procs */
 1332                 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
 1333         } while (p->p_step);
 1334 }
 1335 
 1336 static int
 1337 protect_setchild(struct thread *td, struct proc *p, int flags)
 1338 {
 1339 
 1340         PROC_LOCK_ASSERT(p, MA_OWNED);
 1341         if (p->p_flag & P_SYSTEM || p_cansched(td, p) != 0)
 1342                 return (0);
 1343         if (flags & PPROT_SET) {
 1344                 p->p_flag |= P_PROTECTED;
 1345                 if (flags & PPROT_INHERIT)
 1346                         p->p_flag2 |= P2_INHERIT_PROTECTED;
 1347         } else {
 1348                 p->p_flag &= ~P_PROTECTED;
 1349                 p->p_flag2 &= ~P2_INHERIT_PROTECTED;
 1350         }
 1351         return (1);
 1352 }
 1353 
 1354 static int
 1355 protect_setchildren(struct thread *td, struct proc *top, int flags)
 1356 {
 1357         struct proc *p;
 1358         int ret;
 1359 
 1360         p = top;
 1361         ret = 0;
 1362         sx_assert(&proctree_lock, SX_LOCKED);
 1363         for (;;) {
 1364                 ret |= protect_setchild(td, p, flags);
 1365                 PROC_UNLOCK(p);
 1366                 /*
 1367                  * If this process has children, descend to them next,
 1368                  * otherwise do any siblings, and if done with this level,
 1369                  * follow back up the tree (but not past top).
 1370                  */
 1371                 if (!LIST_EMPTY(&p->p_children))
 1372                         p = LIST_FIRST(&p->p_children);
 1373                 else for (;;) {
 1374                         if (p == top) {
 1375                                 PROC_LOCK(p);
 1376                                 return (ret);
 1377                         }
 1378                         if (LIST_NEXT(p, p_sibling)) {
 1379                                 p = LIST_NEXT(p, p_sibling);
 1380                                 break;
 1381                         }
 1382                         p = p->p_pptr;
 1383                 }
 1384                 PROC_LOCK(p);
 1385         }
 1386 }
 1387 
 1388 static int
 1389 protect_set(struct thread *td, struct proc *p, int flags)
 1390 {
 1391         int error, ret;
 1392 
 1393         switch (PPROT_OP(flags)) {
 1394         case PPROT_SET:
 1395         case PPROT_CLEAR:
 1396                 break;
 1397         default:
 1398                 return (EINVAL);
 1399         }
 1400 
 1401         if ((PPROT_FLAGS(flags) & ~(PPROT_DESCEND | PPROT_INHERIT)) != 0)
 1402                 return (EINVAL);
 1403 
 1404         error = priv_check(td, PRIV_VM_MADV_PROTECT);
 1405         if (error)
 1406                 return (error);
 1407 
 1408         if (flags & PPROT_DESCEND)
 1409                 ret = protect_setchildren(td, p, flags);
 1410         else
 1411                 ret = protect_setchild(td, p, flags);
 1412         if (ret == 0)
 1413                 return (EPERM);
 1414         return (0);
 1415 }
 1416 
 1417 #ifndef _SYS_SYSPROTO_H_
 1418 struct procctl_args {
 1419         idtype_t idtype;
 1420         id_t    id;
 1421         int     com;
 1422         void    *data;
 1423 };
 1424 #endif
 1425 /* ARGSUSED */
 1426 int
 1427 sys_procctl(struct thread *td, struct procctl_args *uap)
 1428 {
 1429         int error, flags;
 1430         void *data;
 1431 
 1432         switch (uap->com) {
 1433         case PROC_SPROTECT:
 1434                 error = copyin(uap->data, &flags, sizeof(flags));
 1435                 if (error)
 1436                         return (error);
 1437                 data = &flags;
 1438                 break;
 1439         default:
 1440                 return (EINVAL);
 1441         }
 1442 
 1443         return (kern_procctl(td, uap->idtype, uap->id, uap->com, data));
 1444 }
 1445 
 1446 static int
 1447 kern_procctl_single(struct thread *td, struct proc *p, int com, void *data)
 1448 {
 1449 
 1450         PROC_LOCK_ASSERT(p, MA_OWNED);
 1451         switch (com) {
 1452         case PROC_SPROTECT:
 1453                 return (protect_set(td, p, *(int *)data));
 1454         default:
 1455                 return (EINVAL);
 1456         }
 1457 }
 1458 
 1459 int
 1460 kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data)
 1461 {
 1462         struct pgrp *pg;
 1463         struct proc *p;
 1464         int error, first_error, ok;
 1465 
 1466         sx_slock(&proctree_lock);
 1467         switch (idtype) {
 1468         case P_PID:
 1469                 p = pfind(id);
 1470                 if (p == NULL) {
 1471                         error = ESRCH;
 1472                         break;
 1473                 }
 1474                 if (p->p_state == PRS_NEW)
 1475                         error = ESRCH;
 1476                 else
 1477                         error = p_cansee(td, p);
 1478                 if (error == 0)
 1479                         error = kern_procctl_single(td, p, com, data);
 1480                 PROC_UNLOCK(p);
 1481                 break;
 1482         case P_PGID:
 1483                 /*
 1484                  * Attempt to apply the operation to all members of the
 1485                  * group.  Ignore processes in the group that can't be
 1486                  * seen.  Ignore errors so long as at least one process is
 1487                  * able to complete the request successfully.
 1488                  */
 1489                 pg = pgfind(id);
 1490                 if (pg == NULL) {
 1491                         error = ESRCH;
 1492                         break;
 1493                 }
 1494                 PGRP_UNLOCK(pg);
 1495                 ok = 0;
 1496                 first_error = 0;
 1497                 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
 1498                         PROC_LOCK(p);
 1499                         if (p->p_state == PRS_NEW || p_cansee(td, p) != 0) {
 1500                                 PROC_UNLOCK(p);
 1501                                 continue;
 1502                         }
 1503                         error = kern_procctl_single(td, p, com, data);
 1504                         PROC_UNLOCK(p);
 1505                         if (error == 0)
 1506                                 ok = 1;
 1507                         else if (first_error == 0)
 1508                                 first_error = error;
 1509                 }
 1510                 if (ok)
 1511                         error = 0;
 1512                 else if (first_error != 0)
 1513                         error = first_error;
 1514                 else
 1515                         /*
 1516                          * Was not able to see any processes in the
 1517                          * process group.
 1518                          */
 1519                         error = ESRCH;
 1520                 break;
 1521         default:
 1522                 error = EINVAL;
 1523                 break;
 1524         }
 1525         sx_sunlock(&proctree_lock);
 1526         return (error);
 1527 }

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