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: releng/11.1/sys/kern/sys_process.c 325868 2017-11-15 22:39:41Z gordon $");
   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 
  437         pve->pve_fsid = VNOVAL;
  438         pve->pve_fileid = VNOVAL;
  439 
  440         if (error == 0 && obj != NULL) {
  441                 lobj = obj;
  442                 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
  443                         if (tobj != obj)
  444                                 VM_OBJECT_RLOCK(tobj);
  445                         if (lobj != obj)
  446                                 VM_OBJECT_RUNLOCK(lobj);
  447                         lobj = tobj;
  448                         pve->pve_offset += tobj->backing_object_offset;
  449                 }
  450                 vp = vm_object_vnode(lobj);
  451                 if (vp != NULL)
  452                         vref(vp);
  453                 if (lobj != obj)
  454                         VM_OBJECT_RUNLOCK(lobj);
  455                 VM_OBJECT_RUNLOCK(obj);
  456 
  457                 if (vp != NULL) {
  458                         freepath = NULL;
  459                         fullpath = NULL;
  460                         vn_fullpath(td, vp, &fullpath, &freepath);
  461                         vn_lock(vp, LK_SHARED | LK_RETRY);
  462                         if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
  463                                 pve->pve_fileid = vattr.va_fileid;
  464                                 pve->pve_fsid = vattr.va_fsid;
  465                         }
  466                         vput(vp);
  467 
  468                         if (fullpath != NULL) {
  469                                 pve->pve_pathlen = strlen(fullpath) + 1;
  470                                 if (pve->pve_pathlen <= pathlen) {
  471                                         error = copyout(fullpath, pve->pve_path,
  472                                             pve->pve_pathlen);
  473                                 } else
  474                                         error = ENAMETOOLONG;
  475                         }
  476                         if (freepath != NULL)
  477                                 free(freepath, M_TEMP);
  478                 }
  479         }
  480         vmspace_free(vm);
  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         bzero(pl32, sizeof(*pl32));
  522         pl32->pl_lwpid = pl->pl_lwpid;
  523         pl32->pl_event = pl->pl_event;
  524         pl32->pl_flags = pl->pl_flags;
  525         pl32->pl_sigmask = pl->pl_sigmask;
  526         pl32->pl_siglist = pl->pl_siglist;
  527         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
  528         strcpy(pl32->pl_tdname, pl->pl_tdname);
  529         pl32->pl_child_pid = pl->pl_child_pid;
  530         pl32->pl_syscall_code = pl->pl_syscall_code;
  531         pl32->pl_syscall_narg = pl->pl_syscall_narg;
  532 }
  533 #endif /* COMPAT_FREEBSD32 */
  534 
  535 /*
  536  * Process debugging system call.
  537  */
  538 #ifndef _SYS_SYSPROTO_H_
  539 struct ptrace_args {
  540         int     req;
  541         pid_t   pid;
  542         caddr_t addr;
  543         int     data;
  544 };
  545 #endif
  546 
  547 #ifdef COMPAT_FREEBSD32
  548 /*
  549  * This CPP subterfuge is to try and reduce the number of ifdefs in
  550  * the body of the code.
  551  *   COPYIN(uap->addr, &r.reg, sizeof r.reg);
  552  * becomes either:
  553  *   copyin(uap->addr, &r.reg, sizeof r.reg);
  554  * or
  555  *   copyin(uap->addr, &r.reg32, sizeof r.reg32);
  556  * .. except this is done at runtime.
  557  */
  558 #define COPYIN(u, k, s)         wrap32 ? \
  559         copyin(u, k ## 32, s ## 32) : \
  560         copyin(u, k, s)
  561 #define COPYOUT(k, u, s)        wrap32 ? \
  562         copyout(k ## 32, u, s ## 32) : \
  563         copyout(k, u, s)
  564 #else
  565 #define COPYIN(u, k, s)         copyin(u, k, s)
  566 #define COPYOUT(k, u, s)        copyout(k, u, s)
  567 #endif
  568 int
  569 sys_ptrace(struct thread *td, struct ptrace_args *uap)
  570 {
  571         /*
  572          * XXX this obfuscation is to reduce stack usage, but the register
  573          * structs may be too large to put on the stack anyway.
  574          */
  575         union {
  576                 struct ptrace_io_desc piod;
  577                 struct ptrace_lwpinfo pl;
  578                 struct ptrace_vm_entry pve;
  579                 struct dbreg dbreg;
  580                 struct fpreg fpreg;
  581                 struct reg reg;
  582 #ifdef COMPAT_FREEBSD32
  583                 struct dbreg32 dbreg32;
  584                 struct fpreg32 fpreg32;
  585                 struct reg32 reg32;
  586                 struct ptrace_io_desc32 piod32;
  587                 struct ptrace_lwpinfo32 pl32;
  588                 struct ptrace_vm_entry32 pve32;
  589 #endif
  590                 int ptevents;
  591         } r;
  592         void *addr;
  593         int error = 0;
  594 #ifdef COMPAT_FREEBSD32
  595         int wrap32 = 0;
  596 
  597         if (SV_CURPROC_FLAG(SV_ILP32))
  598                 wrap32 = 1;
  599 #endif
  600         AUDIT_ARG_PID(uap->pid);
  601         AUDIT_ARG_CMD(uap->req);
  602         AUDIT_ARG_VALUE(uap->data);
  603         addr = &r;
  604         switch (uap->req) {
  605         case PT_GET_EVENT_MASK:
  606         case PT_GETREGS:
  607         case PT_GETFPREGS:
  608         case PT_GETDBREGS:
  609         case PT_LWPINFO:
  610                 break;
  611         case PT_SETREGS:
  612                 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
  613                 break;
  614         case PT_SETFPREGS:
  615                 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
  616                 break;
  617         case PT_SETDBREGS:
  618                 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
  619                 break;
  620         case PT_SET_EVENT_MASK:
  621                 if (uap->data != sizeof(r.ptevents))
  622                         error = EINVAL;
  623                 else
  624                         error = copyin(uap->addr, &r.ptevents, uap->data);
  625                 break;
  626         case PT_IO:
  627                 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
  628                 break;
  629         case PT_VM_ENTRY:
  630                 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
  631                 break;
  632         default:
  633                 addr = uap->addr;
  634                 break;
  635         }
  636         if (error)
  637                 return (error);
  638 
  639         error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
  640         if (error)
  641                 return (error);
  642 
  643         switch (uap->req) {
  644         case PT_VM_ENTRY:
  645                 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
  646                 break;
  647         case PT_IO:
  648                 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
  649                 break;
  650         case PT_GETREGS:
  651                 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
  652                 break;
  653         case PT_GETFPREGS:
  654                 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
  655                 break;
  656         case PT_GETDBREGS:
  657                 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
  658                 break;
  659         case PT_GET_EVENT_MASK:
  660                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  661                 error = copyout(&r.ptevents, uap->addr, uap->data);
  662                 break;
  663         case PT_LWPINFO:
  664                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  665                 error = copyout(&r.pl, uap->addr, uap->data);
  666                 break;
  667         }
  668 
  669         return (error);
  670 }
  671 #undef COPYIN
  672 #undef COPYOUT
  673 
  674 #ifdef COMPAT_FREEBSD32
  675 /*
  676  *   PROC_READ(regs, td2, addr);
  677  * becomes either:
  678  *   proc_read_regs(td2, addr);
  679  * or
  680  *   proc_read_regs32(td2, addr);
  681  * .. except this is done at runtime.  There is an additional
  682  * complication in that PROC_WRITE disallows 32 bit consumers
  683  * from writing to 64 bit address space targets.
  684  */
  685 #define PROC_READ(w, t, a)      wrap32 ? \
  686         proc_read_ ## w ## 32(t, a) : \
  687         proc_read_ ## w (t, a)
  688 #define PROC_WRITE(w, t, a)     wrap32 ? \
  689         (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
  690         proc_write_ ## w (t, a)
  691 #else
  692 #define PROC_READ(w, t, a)      proc_read_ ## w (t, a)
  693 #define PROC_WRITE(w, t, a)     proc_write_ ## w (t, a)
  694 #endif
  695 
  696 void
  697 proc_set_traced(struct proc *p, bool stop)
  698 {
  699 
  700         PROC_LOCK_ASSERT(p, MA_OWNED);
  701         p->p_flag |= P_TRACED;
  702         if (stop)
  703                 p->p_flag2 |= P2_PTRACE_FSTP;
  704         p->p_ptevents = PTRACE_DEFAULT;
  705         p->p_oppid = p->p_pptr->p_pid;
  706 }
  707 
  708 int
  709 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
  710 {
  711         struct iovec iov;
  712         struct uio uio;
  713         struct proc *curp, *p, *pp;
  714         struct thread *td2 = NULL, *td3;
  715         struct ptrace_io_desc *piod = NULL;
  716         struct ptrace_lwpinfo *pl;
  717         int error, num, tmp;
  718         int proctree_locked = 0;
  719         lwpid_t tid = 0, *buf;
  720 #ifdef COMPAT_FREEBSD32
  721         int wrap32 = 0, safe = 0;
  722         struct ptrace_io_desc32 *piod32 = NULL;
  723         struct ptrace_lwpinfo32 *pl32 = NULL;
  724         struct ptrace_lwpinfo plr;
  725 #endif
  726 
  727         curp = td->td_proc;
  728 
  729         /* Lock proctree before locking the process. */
  730         switch (req) {
  731         case PT_TRACE_ME:
  732         case PT_ATTACH:
  733         case PT_STEP:
  734         case PT_CONTINUE:
  735         case PT_TO_SCE:
  736         case PT_TO_SCX:
  737         case PT_SYSCALL:
  738         case PT_FOLLOW_FORK:
  739         case PT_LWP_EVENTS:
  740         case PT_GET_EVENT_MASK:
  741         case PT_SET_EVENT_MASK:
  742         case PT_DETACH:
  743                 sx_xlock(&proctree_lock);
  744                 proctree_locked = 1;
  745                 break;
  746         default:
  747                 break;
  748         }
  749 
  750         if (req == PT_TRACE_ME) {
  751                 p = td->td_proc;
  752                 PROC_LOCK(p);
  753         } else {
  754                 if (pid <= PID_MAX) {
  755                         if ((p = pfind(pid)) == NULL) {
  756                                 if (proctree_locked)
  757                                         sx_xunlock(&proctree_lock);
  758                                 return (ESRCH);
  759                         }
  760                 } else {
  761                         td2 = tdfind(pid, -1);
  762                         if (td2 == NULL) {
  763                                 if (proctree_locked)
  764                                         sx_xunlock(&proctree_lock);
  765                                 return (ESRCH);
  766                         }
  767                         p = td2->td_proc;
  768                         tid = pid;
  769                         pid = p->p_pid;
  770                 }
  771         }
  772         AUDIT_ARG_PROCESS(p);
  773 
  774         if ((p->p_flag & P_WEXIT) != 0) {
  775                 error = ESRCH;
  776                 goto fail;
  777         }
  778         if ((error = p_cansee(td, p)) != 0)
  779                 goto fail;
  780 
  781         if ((error = p_candebug(td, p)) != 0)
  782                 goto fail;
  783 
  784         /*
  785          * System processes can't be debugged.
  786          */
  787         if ((p->p_flag & P_SYSTEM) != 0) {
  788                 error = EINVAL;
  789                 goto fail;
  790         }
  791 
  792         if (tid == 0) {
  793                 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
  794                         KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
  795                         td2 = p->p_xthread;
  796                 } else {
  797                         td2 = FIRST_THREAD_IN_PROC(p);
  798                 }
  799                 tid = td2->td_tid;
  800         }
  801 
  802 #ifdef COMPAT_FREEBSD32
  803         /*
  804          * Test if we're a 32 bit client and what the target is.
  805          * Set the wrap controls accordingly.
  806          */
  807         if (SV_CURPROC_FLAG(SV_ILP32)) {
  808                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
  809                         safe = 1;
  810                 wrap32 = 1;
  811         }
  812 #endif
  813         /*
  814          * Permissions check
  815          */
  816         switch (req) {
  817         case PT_TRACE_ME:
  818                 /*
  819                  * Always legal, when there is a parent process which
  820                  * could trace us.  Otherwise, reject.
  821                  */
  822                 if ((p->p_flag & P_TRACED) != 0) {
  823                         error = EBUSY;
  824                         goto fail;
  825                 }
  826                 if (p->p_pptr == initproc) {
  827                         error = EPERM;
  828                         goto fail;
  829                 }
  830                 break;
  831 
  832         case PT_ATTACH:
  833                 /* Self */
  834                 if (p == td->td_proc) {
  835                         error = EINVAL;
  836                         goto fail;
  837                 }
  838 
  839                 /* Already traced */
  840                 if (p->p_flag & P_TRACED) {
  841                         error = EBUSY;
  842                         goto fail;
  843                 }
  844 
  845                 /* Can't trace an ancestor if you're being traced. */
  846                 if (curp->p_flag & P_TRACED) {
  847                         for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
  848                                 if (pp == p) {
  849                                         error = EINVAL;
  850                                         goto fail;
  851                                 }
  852                         }
  853                 }
  854 
  855 
  856                 /* OK */
  857                 break;
  858 
  859         case PT_CLEARSTEP:
  860                 /* Allow thread to clear single step for itself */
  861                 if (td->td_tid == tid)
  862                         break;
  863 
  864                 /* FALLTHROUGH */
  865         default:
  866                 /* not being traced... */
  867                 if ((p->p_flag & P_TRACED) == 0) {
  868                         error = EPERM;
  869                         goto fail;
  870                 }
  871 
  872                 /* not being traced by YOU */
  873                 if (p->p_pptr != td->td_proc) {
  874                         error = EBUSY;
  875                         goto fail;
  876                 }
  877 
  878                 /* not currently stopped */
  879                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
  880                     p->p_suspcount != p->p_numthreads  ||
  881                     (p->p_flag & P_WAITED) == 0) {
  882                         error = EBUSY;
  883                         goto fail;
  884                 }
  885 
  886                 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
  887                         static int count = 0;
  888                         if (count++ == 0)
  889                                 printf("P_STOPPED_TRACE not set.\n");
  890                 }
  891 
  892                 /* OK */
  893                 break;
  894         }
  895 
  896         /* Keep this process around until we finish this request. */
  897         _PHOLD(p);
  898 
  899 #ifdef FIX_SSTEP
  900         /*
  901          * Single step fixup ala procfs
  902          */
  903         FIX_SSTEP(td2);
  904 #endif
  905 
  906         /*
  907          * Actually do the requests
  908          */
  909 
  910         td->td_retval[0] = 0;
  911 
  912         switch (req) {
  913         case PT_TRACE_ME:
  914                 /* set my trace flag and "owner" so it can read/write me */
  915                 proc_set_traced(p, false);
  916                 if (p->p_flag & P_PPWAIT)
  917                         p->p_flag |= P_PPTRACE;
  918                 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
  919                 break;
  920 
  921         case PT_ATTACH:
  922                 /* security check done above */
  923                 /*
  924                  * It would be nice if the tracing relationship was separate
  925                  * from the parent relationship but that would require
  926                  * another set of links in the proc struct or for "wait"
  927                  * to scan the entire proc table.  To make life easier,
  928                  * we just re-parent the process we're trying to trace.
  929                  * The old parent is remembered so we can put things back
  930                  * on a "detach".
  931                  */
  932                 proc_set_traced(p, true);
  933                 if (p->p_pptr != td->td_proc) {
  934                         proc_reparent(p, td->td_proc);
  935                 }
  936                 data = SIGSTOP;
  937                 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
  938                     p->p_oppid);
  939                 goto sendsig;   /* in PT_CONTINUE below */
  940 
  941         case PT_CLEARSTEP:
  942                 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
  943                     p->p_pid);
  944                 error = ptrace_clear_single_step(td2);
  945                 break;
  946 
  947         case PT_SETSTEP:
  948                 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
  949                     p->p_pid);
  950                 error = ptrace_single_step(td2);
  951                 break;
  952 
  953         case PT_SUSPEND:
  954                 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
  955                     p->p_pid);
  956                 td2->td_dbgflags |= TDB_SUSPEND;
  957                 thread_lock(td2);
  958                 td2->td_flags |= TDF_NEEDSUSPCHK;
  959                 thread_unlock(td2);
  960                 break;
  961 
  962         case PT_RESUME:
  963                 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
  964                     p->p_pid);
  965                 td2->td_dbgflags &= ~TDB_SUSPEND;
  966                 break;
  967 
  968         case PT_FOLLOW_FORK:
  969                 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
  970                     p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
  971                     data ? "enabled" : "disabled");
  972                 if (data)
  973                         p->p_ptevents |= PTRACE_FORK;
  974                 else
  975                         p->p_ptevents &= ~PTRACE_FORK;
  976                 break;
  977 
  978         case PT_LWP_EVENTS:
  979                 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
  980                     p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
  981                     data ? "enabled" : "disabled");
  982                 if (data)
  983                         p->p_ptevents |= PTRACE_LWP;
  984                 else
  985                         p->p_ptevents &= ~PTRACE_LWP;
  986                 break;
  987 
  988         case PT_GET_EVENT_MASK:
  989                 if (data != sizeof(p->p_ptevents)) {
  990                         error = EINVAL;
  991                         break;
  992                 }
  993                 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
  994                     p->p_ptevents);
  995                 *(int *)addr = p->p_ptevents;
  996                 break;
  997 
  998         case PT_SET_EVENT_MASK:
  999                 if (data != sizeof(p->p_ptevents)) {
 1000                         error = EINVAL;
 1001                         break;
 1002                 }
 1003                 tmp = *(int *)addr;
 1004                 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
 1005                     PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
 1006                         error = EINVAL;
 1007                         break;
 1008                 }
 1009                 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
 1010                     p->p_pid, p->p_ptevents, tmp);
 1011                 p->p_ptevents = tmp;
 1012                 break;
 1013                 
 1014         case PT_STEP:
 1015         case PT_CONTINUE:
 1016         case PT_TO_SCE:
 1017         case PT_TO_SCX:
 1018         case PT_SYSCALL:
 1019         case PT_DETACH:
 1020                 /* Zero means do not send any signal */
 1021                 if (data < 0 || data > _SIG_MAXSIG) {
 1022                         error = EINVAL;
 1023                         break;
 1024                 }
 1025 
 1026                 switch (req) {
 1027                 case PT_STEP:
 1028                         CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
 1029                             td2->td_tid, p->p_pid);
 1030                         error = ptrace_single_step(td2);
 1031                         if (error)
 1032                                 goto out;
 1033                         break;
 1034                 case PT_CONTINUE:
 1035                 case PT_TO_SCE:
 1036                 case PT_TO_SCX:
 1037                 case PT_SYSCALL:
 1038                         if (addr != (void *)1) {
 1039                                 error = ptrace_set_pc(td2,
 1040                                     (u_long)(uintfptr_t)addr);
 1041                                 if (error)
 1042                                         goto out;
 1043                         }
 1044                         switch (req) {
 1045                         case PT_TO_SCE:
 1046                                 p->p_ptevents |= PTRACE_SCE;
 1047                                 CTR4(KTR_PTRACE,
 1048                     "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
 1049                                     p->p_pid, p->p_ptevents,
 1050                                     (u_long)(uintfptr_t)addr, data);
 1051                                 break;
 1052                         case PT_TO_SCX:
 1053                                 p->p_ptevents |= PTRACE_SCX;
 1054                                 CTR4(KTR_PTRACE,
 1055                     "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
 1056                                     p->p_pid, p->p_ptevents,
 1057                                     (u_long)(uintfptr_t)addr, data);
 1058                                 break;
 1059                         case PT_SYSCALL:
 1060                                 p->p_ptevents |= PTRACE_SYSCALL;
 1061                                 CTR4(KTR_PTRACE,
 1062                     "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
 1063                                     p->p_pid, p->p_ptevents,
 1064                                     (u_long)(uintfptr_t)addr, data);
 1065                                 break;
 1066                         case PT_CONTINUE:
 1067                                 CTR3(KTR_PTRACE,
 1068                                     "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
 1069                                     p->p_pid, (u_long)(uintfptr_t)addr, data);
 1070                                 break;
 1071                         }
 1072                         break;
 1073                 case PT_DETACH:
 1074                         /*
 1075                          * Reset the process parent.
 1076                          *
 1077                          * NB: This clears P_TRACED before reparenting
 1078                          * a detached process back to its original
 1079                          * parent.  Otherwise the debugee will be set
 1080                          * as an orphan of the debugger.
 1081                          */
 1082                         p->p_flag &= ~(P_TRACED | P_WAITED);
 1083                         if (p->p_oppid != p->p_pptr->p_pid) {
 1084                                 PROC_LOCK(p->p_pptr);
 1085                                 sigqueue_take(p->p_ksi);
 1086                                 PROC_UNLOCK(p->p_pptr);
 1087 
 1088                                 pp = proc_realparent(p);
 1089                                 proc_reparent(p, pp);
 1090                                 if (pp == initproc)
 1091                                         p->p_sigparent = SIGCHLD;
 1092                                 CTR3(KTR_PTRACE,
 1093                             "PT_DETACH: pid %d reparented to pid %d, sig %d",
 1094                                     p->p_pid, pp->p_pid, data);
 1095                         } else
 1096                                 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
 1097                                     p->p_pid, data);
 1098                         p->p_oppid = 0;
 1099                         p->p_ptevents = 0;
 1100                         FOREACH_THREAD_IN_PROC(p, td3) {
 1101                                 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
 1102                                         sigqueue_delete(&td3->td_sigqueue,
 1103                                             SIGSTOP);
 1104                                 }
 1105                                 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP);
 1106                         }
 1107                         if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
 1108                                 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
 1109                                 p->p_flag2 &= ~P2_PTRACE_FSTP;
 1110                         }
 1111 
 1112                         /* should we send SIGCHLD? */
 1113                         /* childproc_continued(p); */
 1114                         break;
 1115                 }
 1116 
 1117         sendsig:
 1118                 if (proctree_locked) {
 1119                         sx_xunlock(&proctree_lock);
 1120                         proctree_locked = 0;
 1121                 }
 1122                 p->p_xsig = data;
 1123                 p->p_xthread = NULL;
 1124                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
 1125                         /* deliver or queue signal */
 1126                         td2->td_dbgflags &= ~TDB_XSIG;
 1127                         td2->td_xsig = data;
 1128 
 1129                         /*
 1130                          * P_WKILLED is insurance that a PT_KILL/SIGKILL always
 1131                          * works immediately, even if another thread is
 1132                          * unsuspended first and attempts to handle a different
 1133                          * signal or if the POSIX.1b style signal queue cannot
 1134                          * accommodate any new signals.
 1135                          */
 1136                         if (data == SIGKILL)
 1137                                 p->p_flag |= P_WKILLED;
 1138 
 1139                         if (req == PT_DETACH) {
 1140                                 FOREACH_THREAD_IN_PROC(p, td3)
 1141                                         td3->td_dbgflags &= ~TDB_SUSPEND;
 1142                         }
 1143                         /*
 1144                          * unsuspend all threads, to not let a thread run,
 1145                          * you should use PT_SUSPEND to suspend it before
 1146                          * continuing process.
 1147                          */
 1148                         PROC_SLOCK(p);
 1149                         p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
 1150                         thread_unsuspend(p);
 1151                         PROC_SUNLOCK(p);
 1152                         if (req == PT_ATTACH)
 1153                                 kern_psignal(p, data);
 1154                 } else {
 1155                         if (data)
 1156                                 kern_psignal(p, data);
 1157                 }
 1158                 break;
 1159 
 1160         case PT_WRITE_I:
 1161         case PT_WRITE_D:
 1162                 td2->td_dbgflags |= TDB_USERWR;
 1163                 PROC_UNLOCK(p);
 1164                 error = 0;
 1165                 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
 1166                     sizeof(int)) != sizeof(int))
 1167                         error = ENOMEM;
 1168                 else
 1169                         CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
 1170                             p->p_pid, addr, data);
 1171                 PROC_LOCK(p);
 1172                 break;
 1173 
 1174         case PT_READ_I:
 1175         case PT_READ_D:
 1176                 PROC_UNLOCK(p);
 1177                 error = tmp = 0;
 1178                 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
 1179                     sizeof(int)) != sizeof(int))
 1180                         error = ENOMEM;
 1181                 else
 1182                         CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
 1183                             p->p_pid, addr, tmp);
 1184                 td->td_retval[0] = tmp;
 1185                 PROC_LOCK(p);
 1186                 break;
 1187 
 1188         case PT_IO:
 1189 #ifdef COMPAT_FREEBSD32
 1190                 if (wrap32) {
 1191                         piod32 = addr;
 1192                         iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
 1193                         iov.iov_len = piod32->piod_len;
 1194                         uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
 1195                         uio.uio_resid = piod32->piod_len;
 1196                 } else
 1197 #endif
 1198                 {
 1199                         piod = addr;
 1200                         iov.iov_base = piod->piod_addr;
 1201                         iov.iov_len = piod->piod_len;
 1202                         uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
 1203                         uio.uio_resid = piod->piod_len;
 1204                 }
 1205                 uio.uio_iov = &iov;
 1206                 uio.uio_iovcnt = 1;
 1207                 uio.uio_segflg = UIO_USERSPACE;
 1208                 uio.uio_td = td;
 1209 #ifdef COMPAT_FREEBSD32
 1210                 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
 1211 #else
 1212                 tmp = piod->piod_op;
 1213 #endif
 1214                 switch (tmp) {
 1215                 case PIOD_READ_D:
 1216                 case PIOD_READ_I:
 1217                         CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
 1218                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1219                         uio.uio_rw = UIO_READ;
 1220                         break;
 1221                 case PIOD_WRITE_D:
 1222                 case PIOD_WRITE_I:
 1223                         CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
 1224                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1225                         td2->td_dbgflags |= TDB_USERWR;
 1226                         uio.uio_rw = UIO_WRITE;
 1227                         break;
 1228                 default:
 1229                         error = EINVAL;
 1230                         goto out;
 1231                 }
 1232                 PROC_UNLOCK(p);
 1233                 error = proc_rwmem(p, &uio);
 1234 #ifdef COMPAT_FREEBSD32
 1235                 if (wrap32)
 1236                         piod32->piod_len -= uio.uio_resid;
 1237                 else
 1238 #endif
 1239                         piod->piod_len -= uio.uio_resid;
 1240                 PROC_LOCK(p);
 1241                 break;
 1242 
 1243         case PT_KILL:
 1244                 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
 1245                 data = SIGKILL;
 1246                 goto sendsig;   /* in PT_CONTINUE above */
 1247 
 1248         case PT_SETREGS:
 1249                 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
 1250                     p->p_pid);
 1251                 td2->td_dbgflags |= TDB_USERWR;
 1252                 error = PROC_WRITE(regs, td2, addr);
 1253                 break;
 1254 
 1255         case PT_GETREGS:
 1256                 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
 1257                     p->p_pid);
 1258                 error = PROC_READ(regs, td2, addr);
 1259                 break;
 1260 
 1261         case PT_SETFPREGS:
 1262                 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
 1263                     p->p_pid);
 1264                 td2->td_dbgflags |= TDB_USERWR;
 1265                 error = PROC_WRITE(fpregs, td2, addr);
 1266                 break;
 1267 
 1268         case PT_GETFPREGS:
 1269                 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
 1270                     p->p_pid);
 1271                 error = PROC_READ(fpregs, td2, addr);
 1272                 break;
 1273 
 1274         case PT_SETDBREGS:
 1275                 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
 1276                     p->p_pid);
 1277                 td2->td_dbgflags |= TDB_USERWR;
 1278                 error = PROC_WRITE(dbregs, td2, addr);
 1279                 break;
 1280 
 1281         case PT_GETDBREGS:
 1282                 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
 1283                     p->p_pid);
 1284                 error = PROC_READ(dbregs, td2, addr);
 1285                 break;
 1286 
 1287         case PT_LWPINFO:
 1288                 if (data <= 0 ||
 1289 #ifdef COMPAT_FREEBSD32
 1290                     (!wrap32 && data > sizeof(*pl)) ||
 1291                     (wrap32 && data > sizeof(*pl32))) {
 1292 #else
 1293                     data > sizeof(*pl)) {
 1294 #endif
 1295                         error = EINVAL;
 1296                         break;
 1297                 }
 1298 #ifdef COMPAT_FREEBSD32
 1299                 if (wrap32) {
 1300                         pl = &plr;
 1301                         pl32 = addr;
 1302                 } else
 1303 #endif
 1304                 pl = addr;
 1305                 bzero(pl, sizeof(*pl));
 1306                 pl->pl_lwpid = td2->td_tid;
 1307                 pl->pl_event = PL_EVENT_NONE;
 1308                 pl->pl_flags = 0;
 1309                 if (td2->td_dbgflags & TDB_XSIG) {
 1310                         pl->pl_event = PL_EVENT_SIGNAL;
 1311                         if (td2->td_dbgksi.ksi_signo != 0 &&
 1312 #ifdef COMPAT_FREEBSD32
 1313                             ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
 1314                             pl_siginfo) + sizeof(pl->pl_siginfo)) ||
 1315                             (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
 1316                             pl_siginfo) + sizeof(struct siginfo32)))
 1317 #else
 1318                             data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
 1319                             + sizeof(pl->pl_siginfo)
 1320 #endif
 1321                         ){
 1322                                 pl->pl_flags |= PL_FLAG_SI;
 1323                                 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
 1324                         }
 1325                 }
 1326                 if (td2->td_dbgflags & TDB_SCE)
 1327                         pl->pl_flags |= PL_FLAG_SCE;
 1328                 else if (td2->td_dbgflags & TDB_SCX)
 1329                         pl->pl_flags |= PL_FLAG_SCX;
 1330                 if (td2->td_dbgflags & TDB_EXEC)
 1331                         pl->pl_flags |= PL_FLAG_EXEC;
 1332                 if (td2->td_dbgflags & TDB_FORK) {
 1333                         pl->pl_flags |= PL_FLAG_FORKED;
 1334                         pl->pl_child_pid = td2->td_dbg_forked;
 1335                         if (td2->td_dbgflags & TDB_VFORK)
 1336                                 pl->pl_flags |= PL_FLAG_VFORKED;
 1337                 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
 1338                     TDB_VFORK)
 1339                         pl->pl_flags |= PL_FLAG_VFORK_DONE;
 1340                 if (td2->td_dbgflags & TDB_CHILD)
 1341                         pl->pl_flags |= PL_FLAG_CHILD;
 1342                 if (td2->td_dbgflags & TDB_BORN)
 1343                         pl->pl_flags |= PL_FLAG_BORN;
 1344                 if (td2->td_dbgflags & TDB_EXIT)
 1345                         pl->pl_flags |= PL_FLAG_EXITED;
 1346                 pl->pl_sigmask = td2->td_sigmask;
 1347                 pl->pl_siglist = td2->td_siglist;
 1348                 strcpy(pl->pl_tdname, td2->td_name);
 1349                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
 1350                         pl->pl_syscall_code = td2->td_dbg_sc_code;
 1351                         pl->pl_syscall_narg = td2->td_dbg_sc_narg;
 1352                 } else {
 1353                         pl->pl_syscall_code = 0;
 1354                         pl->pl_syscall_narg = 0;
 1355                 }
 1356 #ifdef COMPAT_FREEBSD32
 1357                 if (wrap32)
 1358                         ptrace_lwpinfo_to32(pl, pl32);
 1359 #endif
 1360                 CTR6(KTR_PTRACE,
 1361     "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
 1362                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
 1363                     pl->pl_child_pid, pl->pl_syscall_code);
 1364                 break;
 1365 
 1366         case PT_GETNUMLWPS:
 1367                 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
 1368                     p->p_numthreads);
 1369                 td->td_retval[0] = p->p_numthreads;
 1370                 break;
 1371 
 1372         case PT_GETLWPLIST:
 1373                 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
 1374                     p->p_pid, data, p->p_numthreads);
 1375                 if (data <= 0) {
 1376                         error = EINVAL;
 1377                         break;
 1378                 }
 1379                 num = imin(p->p_numthreads, data);
 1380                 PROC_UNLOCK(p);
 1381                 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
 1382                 tmp = 0;
 1383                 PROC_LOCK(p);
 1384                 FOREACH_THREAD_IN_PROC(p, td2) {
 1385                         if (tmp >= num)
 1386                                 break;
 1387                         buf[tmp++] = td2->td_tid;
 1388                 }
 1389                 PROC_UNLOCK(p);
 1390                 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
 1391                 free(buf, M_TEMP);
 1392                 if (!error)
 1393                         td->td_retval[0] = tmp;
 1394                 PROC_LOCK(p);
 1395                 break;
 1396 
 1397         case PT_VM_TIMESTAMP:
 1398                 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
 1399                     p->p_pid, p->p_vmspace->vm_map.timestamp);
 1400                 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
 1401                 break;
 1402 
 1403         case PT_VM_ENTRY:
 1404                 PROC_UNLOCK(p);
 1405 #ifdef COMPAT_FREEBSD32
 1406                 if (wrap32)
 1407                         error = ptrace_vm_entry32(td, p, addr);
 1408                 else
 1409 #endif
 1410                 error = ptrace_vm_entry(td, p, addr);
 1411                 PROC_LOCK(p);
 1412                 break;
 1413 
 1414         default:
 1415 #ifdef __HAVE_PTRACE_MACHDEP
 1416                 if (req >= PT_FIRSTMACH) {
 1417                         PROC_UNLOCK(p);
 1418                         error = cpu_ptrace(td2, req, addr, data);
 1419                         PROC_LOCK(p);
 1420                 } else
 1421 #endif
 1422                         /* Unknown request. */
 1423                         error = EINVAL;
 1424                 break;
 1425         }
 1426 
 1427 out:
 1428         /* Drop our hold on this process now that the request has completed. */
 1429         _PRELE(p);
 1430 fail:
 1431         PROC_UNLOCK(p);
 1432         if (proctree_locked)
 1433                 sx_xunlock(&proctree_lock);
 1434         return (error);
 1435 }
 1436 #undef PROC_READ
 1437 #undef PROC_WRITE
 1438 
 1439 /*
 1440  * Stop a process because of a debugging event;
 1441  * stay stopped until p->p_step is cleared
 1442  * (cleared by PIOCCONT in procfs).
 1443  */
 1444 void
 1445 stopevent(struct proc *p, unsigned int event, unsigned int val)
 1446 {
 1447 
 1448         PROC_LOCK_ASSERT(p, MA_OWNED);
 1449         p->p_step = 1;
 1450         CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
 1451             val);
 1452         do {
 1453                 if (event != S_EXIT)
 1454                         p->p_xsig = val;
 1455                 p->p_xthread = NULL;
 1456                 p->p_stype = event;     /* Which event caused the stop? */
 1457                 wakeup(&p->p_stype);    /* Wake up any PIOCWAIT'ing procs */
 1458                 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
 1459         } while (p->p_step);
 1460 }

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