The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_process.c

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    1 /*-
    2  * Copyright (c) 1994, Sean Eric Fagan
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by Sean Eric Fagan.
   16  * 4. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/10/sys/kern/sys_process.c 328379 2018-01-24 21:48:39Z 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/vnode.h>
   47 #include <sys/ptrace.h>
   48 #include <sys/rwlock.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_param.h>
   65 
   66 #ifdef COMPAT_FREEBSD32
   67 #include <sys/procfs.h>
   68 #include <compat/freebsd32/freebsd32_signal.h>
   69 
   70 struct ptrace_io_desc32 {
   71         int             piod_op;
   72         uint32_t        piod_offs;
   73         uint32_t        piod_addr;
   74         uint32_t        piod_len;
   75 };
   76 
   77 struct ptrace_vm_entry32 {
   78         int             pve_entry;
   79         int             pve_timestamp;
   80         uint32_t        pve_start;
   81         uint32_t        pve_end;
   82         uint32_t        pve_offset;
   83         u_int           pve_prot;
   84         u_int           pve_pathlen;
   85         int32_t         pve_fileid;
   86         u_int           pve_fsid;
   87         uint32_t        pve_path;
   88 };
   89 
   90 struct ptrace_lwpinfo32 {
   91         lwpid_t pl_lwpid;       /* LWP described. */
   92         int     pl_event;       /* Event that stopped the LWP. */
   93         int     pl_flags;       /* LWP flags. */
   94         sigset_t        pl_sigmask;     /* LWP signal mask */
   95         sigset_t        pl_siglist;     /* LWP pending signal */
   96         struct siginfo32 pl_siginfo;    /* siginfo for signal */
   97         char    pl_tdname[MAXCOMLEN + 1];       /* LWP name. */
   98         pid_t   pl_child_pid;           /* New child pid */
   99         u_int           pl_syscall_code;
  100         u_int           pl_syscall_narg;
  101 };
  102 
  103 #endif
  104 
  105 /*
  106  * Functions implemented using PROC_ACTION():
  107  *
  108  * proc_read_regs(proc, regs)
  109  *      Get the current user-visible register set from the process
  110  *      and copy it into the regs structure (<machine/reg.h>).
  111  *      The process is stopped at the time read_regs is called.
  112  *
  113  * proc_write_regs(proc, regs)
  114  *      Update the current register set from the passed in regs
  115  *      structure.  Take care to avoid clobbering special CPU
  116  *      registers or privileged bits in the PSL.
  117  *      Depending on the architecture this may have fix-up work to do,
  118  *      especially if the IAR or PCW are modified.
  119  *      The process is stopped at the time write_regs is called.
  120  *
  121  * proc_read_fpregs, proc_write_fpregs
  122  *      deal with the floating point register set, otherwise as above.
  123  *
  124  * proc_read_dbregs, proc_write_dbregs
  125  *      deal with the processor debug register set, otherwise as above.
  126  *
  127  * proc_sstep(proc)
  128  *      Arrange for the process to trap after executing a single instruction.
  129  */
  130 
  131 #define PROC_ACTION(action) do {                                        \
  132         int error;                                                      \
  133                                                                         \
  134         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);                        \
  135         if ((td->td_proc->p_flag & P_INMEM) == 0)                       \
  136                 error = EIO;                                            \
  137         else                                                            \
  138                 error = (action);                                       \
  139         return (error);                                                 \
  140 } while(0)
  141 
  142 int
  143 proc_read_regs(struct thread *td, struct reg *regs)
  144 {
  145 
  146         PROC_ACTION(fill_regs(td, regs));
  147 }
  148 
  149 int
  150 proc_write_regs(struct thread *td, struct reg *regs)
  151 {
  152 
  153         PROC_ACTION(set_regs(td, regs));
  154 }
  155 
  156 int
  157 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
  158 {
  159 
  160         PROC_ACTION(fill_dbregs(td, dbregs));
  161 }
  162 
  163 int
  164 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
  165 {
  166 
  167         PROC_ACTION(set_dbregs(td, dbregs));
  168 }
  169 
  170 /*
  171  * Ptrace doesn't support fpregs at all, and there are no security holes
  172  * or translations for fpregs, so we can just copy them.
  173  */
  174 int
  175 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
  176 {
  177 
  178         PROC_ACTION(fill_fpregs(td, fpregs));
  179 }
  180 
  181 int
  182 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
  183 {
  184 
  185         PROC_ACTION(set_fpregs(td, fpregs));
  186 }
  187 
  188 #ifdef COMPAT_FREEBSD32
  189 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
  190 int
  191 proc_read_regs32(struct thread *td, struct reg32 *regs32)
  192 {
  193 
  194         PROC_ACTION(fill_regs32(td, regs32));
  195 }
  196 
  197 int
  198 proc_write_regs32(struct thread *td, struct reg32 *regs32)
  199 {
  200 
  201         PROC_ACTION(set_regs32(td, regs32));
  202 }
  203 
  204 int
  205 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  206 {
  207 
  208         PROC_ACTION(fill_dbregs32(td, dbregs32));
  209 }
  210 
  211 int
  212 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  213 {
  214 
  215         PROC_ACTION(set_dbregs32(td, dbregs32));
  216 }
  217 
  218 int
  219 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  220 {
  221 
  222         PROC_ACTION(fill_fpregs32(td, fpregs32));
  223 }
  224 
  225 int
  226 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  227 {
  228 
  229         PROC_ACTION(set_fpregs32(td, fpregs32));
  230 }
  231 #endif
  232 
  233 int
  234 proc_sstep(struct thread *td)
  235 {
  236 
  237         PROC_ACTION(ptrace_single_step(td));
  238 }
  239 
  240 int
  241 proc_rwmem(struct proc *p, struct uio *uio)
  242 {
  243         vm_map_t map;
  244         vm_offset_t pageno;             /* page number */
  245         vm_prot_t reqprot;
  246         int error, fault_flags, page_offset, writing;
  247 
  248         /*
  249          * Assert that someone has locked this vmspace.  (Should be
  250          * curthread but we can't assert that.)  This keeps the process
  251          * from exiting out from under us until this operation completes.
  252          */
  253         KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
  254             p, p->p_pid));
  255 
  256         /*
  257          * The map we want...
  258          */
  259         map = &p->p_vmspace->vm_map;
  260 
  261         /*
  262          * If we are writing, then we request vm_fault() to create a private
  263          * copy of each page.  Since these copies will not be writeable by the
  264          * process, we must explicity request that they be dirtied.
  265          */
  266         writing = uio->uio_rw == UIO_WRITE;
  267         reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
  268         fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
  269 
  270         /*
  271          * Only map in one page at a time.  We don't have to, but it
  272          * makes things easier.  This way is trivial - right?
  273          */
  274         do {
  275                 vm_offset_t uva;
  276                 u_int len;
  277                 vm_page_t m;
  278 
  279                 uva = (vm_offset_t)uio->uio_offset;
  280 
  281                 /*
  282                  * Get the page number of this segment.
  283                  */
  284                 pageno = trunc_page(uva);
  285                 page_offset = uva - pageno;
  286 
  287                 /*
  288                  * How many bytes to copy
  289                  */
  290                 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
  291 
  292                 /*
  293                  * Fault and hold the page on behalf of the process.
  294                  */
  295                 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
  296                 if (error != KERN_SUCCESS) {
  297                         if (error == KERN_RESOURCE_SHORTAGE)
  298                                 error = ENOMEM;
  299                         else
  300                                 error = EFAULT;
  301                         break;
  302                 }
  303 
  304                 /*
  305                  * Now do the i/o move.
  306                  */
  307                 error = uiomove_fromphys(&m, page_offset, len, uio);
  308 
  309                 /* Make the I-cache coherent for breakpoints. */
  310                 if (writing && error == 0) {
  311                         vm_map_lock_read(map);
  312                         if (vm_map_check_protection(map, pageno, pageno +
  313                             PAGE_SIZE, VM_PROT_EXECUTE))
  314                                 vm_sync_icache(map, uva, len);
  315                         vm_map_unlock_read(map);
  316                 }
  317 
  318                 /*
  319                  * Release the page.
  320                  */
  321                 vm_page_lock(m);
  322                 vm_page_unhold(m);
  323                 vm_page_unlock(m);
  324 
  325         } while (error == 0 && uio->uio_resid > 0);
  326 
  327         return (error);
  328 }
  329 
  330 static int
  331 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
  332 {
  333         struct vattr vattr;
  334         vm_map_t map;
  335         vm_map_entry_t entry;
  336         vm_object_t obj, tobj, lobj;
  337         struct vmspace *vm;
  338         struct vnode *vp;
  339         char *freepath, *fullpath;
  340         u_int pathlen;
  341         int error, index;
  342 
  343         error = 0;
  344         obj = NULL;
  345 
  346         vm = vmspace_acquire_ref(p);
  347         map = &vm->vm_map;
  348         vm_map_lock_read(map);
  349 
  350         do {
  351                 entry = map->header.next;
  352                 index = 0;
  353                 while (index < pve->pve_entry && entry != &map->header) {
  354                         entry = entry->next;
  355                         index++;
  356                 }
  357                 if (index != pve->pve_entry) {
  358                         error = EINVAL;
  359                         break;
  360                 }
  361                 while (entry != &map->header &&
  362                     (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
  363                         entry = entry->next;
  364                         index++;
  365                 }
  366                 if (entry == &map->header) {
  367                         error = ENOENT;
  368                         break;
  369                 }
  370 
  371                 /* We got an entry. */
  372                 pve->pve_entry = index + 1;
  373                 pve->pve_timestamp = map->timestamp;
  374                 pve->pve_start = entry->start;
  375                 pve->pve_end = entry->end - 1;
  376                 pve->pve_offset = entry->offset;
  377                 pve->pve_prot = entry->protection;
  378 
  379                 /* Backing object's path needed? */
  380                 if (pve->pve_pathlen == 0)
  381                         break;
  382 
  383                 pathlen = pve->pve_pathlen;
  384                 pve->pve_pathlen = 0;
  385 
  386                 obj = entry->object.vm_object;
  387                 if (obj != NULL)
  388                         VM_OBJECT_RLOCK(obj);
  389         } while (0);
  390 
  391         vm_map_unlock_read(map);
  392 
  393         pve->pve_fsid = VNOVAL;
  394         pve->pve_fileid = VNOVAL;
  395 
  396         if (error == 0 && obj != NULL) {
  397                 lobj = obj;
  398                 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
  399                         if (tobj != obj)
  400                                 VM_OBJECT_RLOCK(tobj);
  401                         if (lobj != obj)
  402                                 VM_OBJECT_RUNLOCK(lobj);
  403                         lobj = tobj;
  404                         pve->pve_offset += tobj->backing_object_offset;
  405                 }
  406                 vp = vm_object_vnode(lobj);
  407                 if (vp != NULL)
  408                         vref(vp);
  409                 if (lobj != obj)
  410                         VM_OBJECT_RUNLOCK(lobj);
  411                 VM_OBJECT_RUNLOCK(obj);
  412 
  413                 if (vp != NULL) {
  414                         freepath = NULL;
  415                         fullpath = NULL;
  416                         vn_fullpath(td, vp, &fullpath, &freepath);
  417                         vn_lock(vp, LK_SHARED | LK_RETRY);
  418                         if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
  419                                 pve->pve_fileid = vattr.va_fileid;
  420                                 pve->pve_fsid = vattr.va_fsid;
  421                         }
  422                         vput(vp);
  423 
  424                         if (fullpath != NULL) {
  425                                 pve->pve_pathlen = strlen(fullpath) + 1;
  426                                 if (pve->pve_pathlen <= pathlen) {
  427                                         error = copyout(fullpath, pve->pve_path,
  428                                             pve->pve_pathlen);
  429                                 } else
  430                                         error = ENAMETOOLONG;
  431                         }
  432                         if (freepath != NULL)
  433                                 free(freepath, M_TEMP);
  434                 }
  435         }
  436         vmspace_free(vm);
  437         if (error == 0)
  438                 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
  439                     p->p_pid, pve->pve_entry, pve->pve_start);
  440 
  441         return (error);
  442 }
  443 
  444 #ifdef COMPAT_FREEBSD32
  445 static int
  446 ptrace_vm_entry32(struct thread *td, struct proc *p,
  447     struct ptrace_vm_entry32 *pve32)
  448 {
  449         struct ptrace_vm_entry pve;
  450         int error;
  451 
  452         pve.pve_entry = pve32->pve_entry;
  453         pve.pve_pathlen = pve32->pve_pathlen;
  454         pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
  455 
  456         error = ptrace_vm_entry(td, p, &pve);
  457         if (error == 0) {
  458                 pve32->pve_entry = pve.pve_entry;
  459                 pve32->pve_timestamp = pve.pve_timestamp;
  460                 pve32->pve_start = pve.pve_start;
  461                 pve32->pve_end = pve.pve_end;
  462                 pve32->pve_offset = pve.pve_offset;
  463                 pve32->pve_prot = pve.pve_prot;
  464                 pve32->pve_fileid = pve.pve_fileid;
  465                 pve32->pve_fsid = pve.pve_fsid;
  466         }
  467 
  468         pve32->pve_pathlen = pve.pve_pathlen;
  469         return (error);
  470 }
  471 
  472 static void
  473 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
  474     struct ptrace_lwpinfo32 *pl32)
  475 {
  476 
  477         bzero(pl32, sizeof(*pl32));
  478         pl32->pl_lwpid = pl->pl_lwpid;
  479         pl32->pl_event = pl->pl_event;
  480         pl32->pl_flags = pl->pl_flags;
  481         pl32->pl_sigmask = pl->pl_sigmask;
  482         pl32->pl_siglist = pl->pl_siglist;
  483         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
  484         strcpy(pl32->pl_tdname, pl->pl_tdname);
  485         pl32->pl_child_pid = pl->pl_child_pid;
  486         pl32->pl_syscall_code = pl->pl_syscall_code;
  487         pl32->pl_syscall_narg = pl->pl_syscall_narg;
  488 }
  489 #endif /* COMPAT_FREEBSD32 */
  490 
  491 /*
  492  * Process debugging system call.
  493  */
  494 #ifndef _SYS_SYSPROTO_H_
  495 struct ptrace_args {
  496         int     req;
  497         pid_t   pid;
  498         caddr_t addr;
  499         int     data;
  500 };
  501 #endif
  502 
  503 #ifdef COMPAT_FREEBSD32
  504 /*
  505  * This CPP subterfuge is to try and reduce the number of ifdefs in
  506  * the body of the code.
  507  *   COPYIN(uap->addr, &r.reg, sizeof r.reg);
  508  * becomes either:
  509  *   copyin(uap->addr, &r.reg, sizeof r.reg);
  510  * or
  511  *   copyin(uap->addr, &r.reg32, sizeof r.reg32);
  512  * .. except this is done at runtime.
  513  */
  514 #define COPYIN(u, k, s)         wrap32 ? \
  515         copyin(u, k ## 32, s ## 32) : \
  516         copyin(u, k, s)
  517 #define COPYOUT(k, u, s)        wrap32 ? \
  518         copyout(k ## 32, u, s ## 32) : \
  519         copyout(k, u, s)
  520 #else
  521 #define COPYIN(u, k, s)         copyin(u, k, s)
  522 #define COPYOUT(k, u, s)        copyout(k, u, s)
  523 #endif
  524 int
  525 sys_ptrace(struct thread *td, struct ptrace_args *uap)
  526 {
  527         /*
  528          * XXX this obfuscation is to reduce stack usage, but the register
  529          * structs may be too large to put on the stack anyway.
  530          */
  531         union {
  532                 struct ptrace_io_desc piod;
  533                 struct ptrace_lwpinfo pl;
  534                 struct ptrace_vm_entry pve;
  535                 struct dbreg dbreg;
  536                 struct fpreg fpreg;
  537                 struct reg reg;
  538 #ifdef COMPAT_FREEBSD32
  539                 struct dbreg32 dbreg32;
  540                 struct fpreg32 fpreg32;
  541                 struct reg32 reg32;
  542                 struct ptrace_io_desc32 piod32;
  543                 struct ptrace_lwpinfo32 pl32;
  544                 struct ptrace_vm_entry32 pve32;
  545 #endif
  546                 int ptevents;
  547         } r;
  548         void *addr;
  549         int error = 0;
  550 #ifdef COMPAT_FREEBSD32
  551         int wrap32 = 0;
  552 
  553         if (SV_CURPROC_FLAG(SV_ILP32))
  554                 wrap32 = 1;
  555 #endif
  556         AUDIT_ARG_PID(uap->pid);
  557         AUDIT_ARG_CMD(uap->req);
  558         AUDIT_ARG_VALUE(uap->data);
  559         addr = &r;
  560         switch (uap->req) {
  561         case PT_GET_EVENT_MASK:
  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_SET_EVENT_MASK:
  577                 if (uap->data != sizeof(r.ptevents))
  578                         error = EINVAL;
  579                 else
  580                         error = copyin(uap->addr, &r.ptevents, uap->data);
  581                 break;
  582         case PT_IO:
  583                 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
  584                 break;
  585         case PT_VM_ENTRY:
  586                 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
  587                 break;
  588         default:
  589                 addr = uap->addr;
  590                 break;
  591         }
  592         if (error)
  593                 return (error);
  594 
  595         error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
  596         if (error)
  597                 return (error);
  598 
  599         switch (uap->req) {
  600         case PT_VM_ENTRY:
  601                 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
  602                 break;
  603         case PT_IO:
  604                 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
  605                 break;
  606         case PT_GETREGS:
  607                 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
  608                 break;
  609         case PT_GETFPREGS:
  610                 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
  611                 break;
  612         case PT_GETDBREGS:
  613                 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
  614                 break;
  615         case PT_GET_EVENT_MASK:
  616                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  617                 error = copyout(&r.ptevents, uap->addr, uap->data);
  618                 break;
  619         case PT_LWPINFO:
  620                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  621                 error = copyout(&r.pl, uap->addr, uap->data);
  622                 break;
  623         }
  624 
  625         return (error);
  626 }
  627 #undef COPYIN
  628 #undef COPYOUT
  629 
  630 #ifdef COMPAT_FREEBSD32
  631 /*
  632  *   PROC_READ(regs, td2, addr);
  633  * becomes either:
  634  *   proc_read_regs(td2, addr);
  635  * or
  636  *   proc_read_regs32(td2, addr);
  637  * .. except this is done at runtime.  There is an additional
  638  * complication in that PROC_WRITE disallows 32 bit consumers
  639  * from writing to 64 bit address space targets.
  640  */
  641 #define PROC_READ(w, t, a)      wrap32 ? \
  642         proc_read_ ## w ## 32(t, a) : \
  643         proc_read_ ## w (t, a)
  644 #define PROC_WRITE(w, t, a)     wrap32 ? \
  645         (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
  646         proc_write_ ## w (t, a)
  647 #else
  648 #define PROC_READ(w, t, a)      proc_read_ ## w (t, a)
  649 #define PROC_WRITE(w, t, a)     proc_write_ ## w (t, a)
  650 #endif
  651 
  652 void
  653 proc_set_traced(struct proc *p, bool stop)
  654 {
  655 
  656         PROC_LOCK_ASSERT(p, MA_OWNED);
  657         p->p_flag |= P_TRACED;
  658         if (stop)
  659                 p->p_flag2 |= P2_PTRACE_FSTP;
  660         p->p_ptevents = PTRACE_DEFAULT;
  661         p->p_oppid = p->p_pptr->p_pid;
  662 }
  663 
  664 int
  665 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
  666 {
  667         struct iovec iov;
  668         struct uio uio;
  669         struct proc *curp, *p, *pp;
  670         struct thread *td2 = NULL, *td3;
  671         struct ptrace_io_desc *piod = NULL;
  672         struct ptrace_lwpinfo *pl;
  673         int error, write, tmp, num;
  674         int proctree_locked = 0;
  675         lwpid_t tid = 0, *buf;
  676 #ifdef COMPAT_FREEBSD32
  677         int wrap32 = 0, safe = 0;
  678         struct ptrace_io_desc32 *piod32 = NULL;
  679         struct ptrace_lwpinfo32 *pl32 = NULL;
  680         struct ptrace_lwpinfo plr;
  681 #endif
  682 
  683         curp = td->td_proc;
  684 
  685         /* Lock proctree before locking the process. */
  686         switch (req) {
  687         case PT_TRACE_ME:
  688         case PT_ATTACH:
  689         case PT_STEP:
  690         case PT_CONTINUE:
  691         case PT_TO_SCE:
  692         case PT_TO_SCX:
  693         case PT_SYSCALL:
  694         case PT_FOLLOW_FORK:
  695         case PT_LWP_EVENTS:
  696         case PT_GET_EVENT_MASK:
  697         case PT_SET_EVENT_MASK:
  698         case PT_DETACH:
  699                 sx_xlock(&proctree_lock);
  700                 proctree_locked = 1;
  701                 break;
  702         default:
  703                 break;
  704         }
  705 
  706         write = 0;
  707         if (req == PT_TRACE_ME) {
  708                 p = td->td_proc;
  709                 PROC_LOCK(p);
  710         } else {
  711                 if (pid <= PID_MAX) {
  712                         if ((p = pfind(pid)) == NULL) {
  713                                 if (proctree_locked)
  714                                         sx_xunlock(&proctree_lock);
  715                                 return (ESRCH);
  716                         }
  717                 } else {
  718                         td2 = tdfind(pid, -1);
  719                         if (td2 == NULL) {
  720                                 if (proctree_locked)
  721                                         sx_xunlock(&proctree_lock);
  722                                 return (ESRCH);
  723                         }
  724                         p = td2->td_proc;
  725                         tid = pid;
  726                         pid = p->p_pid;
  727                 }
  728         }
  729         AUDIT_ARG_PROCESS(p);
  730 
  731         if ((p->p_flag & P_WEXIT) != 0) {
  732                 error = ESRCH;
  733                 goto fail;
  734         }
  735         if ((error = p_cansee(td, p)) != 0)
  736                 goto fail;
  737 
  738         if ((error = p_candebug(td, p)) != 0)
  739                 goto fail;
  740 
  741         /*
  742          * System processes can't be debugged.
  743          */
  744         if ((p->p_flag & P_SYSTEM) != 0) {
  745                 error = EINVAL;
  746                 goto fail;
  747         }
  748 
  749         if (tid == 0) {
  750                 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
  751                         KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
  752                         td2 = p->p_xthread;
  753                 } else {
  754                         td2 = FIRST_THREAD_IN_PROC(p);
  755                 }
  756                 tid = td2->td_tid;
  757         }
  758 
  759 #ifdef COMPAT_FREEBSD32
  760         /*
  761          * Test if we're a 32 bit client and what the target is.
  762          * Set the wrap controls accordingly.
  763          */
  764         if (SV_CURPROC_FLAG(SV_ILP32)) {
  765                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
  766                         safe = 1;
  767                 wrap32 = 1;
  768         }
  769 #endif
  770         /*
  771          * Permissions check
  772          */
  773         switch (req) {
  774         case PT_TRACE_ME:
  775                 /*
  776                  * Always legal, when there is a parent process which
  777                  * could trace us.  Otherwise, reject.
  778                  */
  779                 if ((p->p_flag & P_TRACED) != 0) {
  780                         error = EBUSY;
  781                         goto fail;
  782                 }
  783                 if (p->p_pptr == initproc) {
  784                         error = EPERM;
  785                         goto fail;
  786                 }
  787                 break;
  788 
  789         case PT_ATTACH:
  790                 /* Self */
  791                 if (p == td->td_proc) {
  792                         error = EINVAL;
  793                         goto fail;
  794                 }
  795 
  796                 /* Already traced */
  797                 if (p->p_flag & P_TRACED) {
  798                         error = EBUSY;
  799                         goto fail;
  800                 }
  801 
  802                 /* Can't trace an ancestor if you're being traced. */
  803                 if (curp->p_flag & P_TRACED) {
  804                         for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
  805                                 if (pp == p) {
  806                                         error = EINVAL;
  807                                         goto fail;
  808                                 }
  809                         }
  810                 }
  811 
  812 
  813                 /* OK */
  814                 break;
  815 
  816         case PT_CLEARSTEP:
  817                 /* Allow thread to clear single step for itself */
  818                 if (td->td_tid == tid)
  819                         break;
  820 
  821                 /* FALLTHROUGH */
  822         default:
  823                 /* not being traced... */
  824                 if ((p->p_flag & P_TRACED) == 0) {
  825                         error = EPERM;
  826                         goto fail;
  827                 }
  828 
  829                 /* not being traced by YOU */
  830                 if (p->p_pptr != td->td_proc) {
  831                         error = EBUSY;
  832                         goto fail;
  833                 }
  834 
  835                 /* not currently stopped */
  836                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
  837                     p->p_suspcount != p->p_numthreads  ||
  838                     (p->p_flag & P_WAITED) == 0) {
  839                         error = EBUSY;
  840                         goto fail;
  841                 }
  842 
  843                 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
  844                         static int count = 0;
  845                         if (count++ == 0)
  846                                 printf("P_STOPPED_TRACE not set.\n");
  847                 }
  848 
  849                 /* OK */
  850                 break;
  851         }
  852 
  853         /* Keep this process around until we finish this request. */
  854         _PHOLD(p);
  855 
  856 #ifdef FIX_SSTEP
  857         /*
  858          * Single step fixup ala procfs
  859          */
  860         FIX_SSTEP(td2);
  861 #endif
  862 
  863         /*
  864          * Actually do the requests
  865          */
  866 
  867         td->td_retval[0] = 0;
  868 
  869         switch (req) {
  870         case PT_TRACE_ME:
  871                 /* set my trace flag and "owner" so it can read/write me */
  872                 proc_set_traced(p, false);
  873                 if (p->p_flag & P_PPWAIT)
  874                         p->p_flag |= P_PPTRACE;
  875                 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
  876                 break;
  877 
  878         case PT_ATTACH:
  879                 /* security check done above */
  880                 /*
  881                  * It would be nice if the tracing relationship was separate
  882                  * from the parent relationship but that would require
  883                  * another set of links in the proc struct or for "wait"
  884                  * to scan the entire proc table.  To make life easier,
  885                  * we just re-parent the process we're trying to trace.
  886                  * The old parent is remembered so we can put things back
  887                  * on a "detach".
  888                  */
  889                 proc_set_traced(p, true);
  890                 if (p->p_pptr != td->td_proc) {
  891                         proc_reparent(p, td->td_proc);
  892                 }
  893                 data = SIGSTOP;
  894                 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
  895                     p->p_oppid);
  896                 goto sendsig;   /* in PT_CONTINUE below */
  897 
  898         case PT_CLEARSTEP:
  899                 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
  900                     p->p_pid);
  901                 error = ptrace_clear_single_step(td2);
  902                 break;
  903 
  904         case PT_SETSTEP:
  905                 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
  906                     p->p_pid);
  907                 error = ptrace_single_step(td2);
  908                 break;
  909 
  910         case PT_SUSPEND:
  911                 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
  912                     p->p_pid);
  913                 td2->td_dbgflags |= TDB_SUSPEND;
  914                 thread_lock(td2);
  915                 td2->td_flags |= TDF_NEEDSUSPCHK;
  916                 thread_unlock(td2);
  917                 break;
  918 
  919         case PT_RESUME:
  920                 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
  921                     p->p_pid);
  922                 td2->td_dbgflags &= ~TDB_SUSPEND;
  923                 break;
  924 
  925         case PT_FOLLOW_FORK:
  926                 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
  927                     p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
  928                     data ? "enabled" : "disabled");
  929                 if (data)
  930                         p->p_ptevents |= PTRACE_FORK;
  931                 else
  932                         p->p_ptevents &= ~PTRACE_FORK;
  933                 break;
  934 
  935         case PT_LWP_EVENTS:
  936                 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
  937                     p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
  938                     data ? "enabled" : "disabled");
  939                 if (data)
  940                         p->p_ptevents |= PTRACE_LWP;
  941                 else
  942                         p->p_ptevents &= ~PTRACE_LWP;
  943                 break;
  944 
  945         case PT_GET_EVENT_MASK:
  946                 if (data != sizeof(p->p_ptevents)) {
  947                         error = EINVAL;
  948                         break;
  949                 }
  950                 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
  951                     p->p_ptevents);
  952                 *(int *)addr = p->p_ptevents;
  953                 break;
  954 
  955         case PT_SET_EVENT_MASK:
  956                 if (data != sizeof(p->p_ptevents)) {
  957                         error = EINVAL;
  958                         break;
  959                 }
  960                 tmp = *(int *)addr;
  961                 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
  962                     PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
  963                         error = EINVAL;
  964                         break;
  965                 }
  966                 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
  967                     p->p_pid, p->p_ptevents, tmp);
  968                 p->p_ptevents = tmp;
  969                 break;
  970                 
  971         case PT_STEP:
  972         case PT_CONTINUE:
  973         case PT_TO_SCE:
  974         case PT_TO_SCX:
  975         case PT_SYSCALL:
  976         case PT_DETACH:
  977                 /* Zero means do not send any signal */
  978                 if (data < 0 || data > _SIG_MAXSIG) {
  979                         error = EINVAL;
  980                         break;
  981                 }
  982 
  983                 switch (req) {
  984                 case PT_STEP:
  985                         CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
  986                             td2->td_tid, p->p_pid, data);
  987                         error = ptrace_single_step(td2);
  988                         if (error)
  989                                 goto out;
  990                         break;
  991                 case PT_CONTINUE:
  992                 case PT_TO_SCE:
  993                 case PT_TO_SCX:
  994                 case PT_SYSCALL:
  995                         if (addr != (void *)1) {
  996                                 error = ptrace_set_pc(td2,
  997                                     (u_long)(uintfptr_t)addr);
  998                                 if (error)
  999                                         goto out;
 1000                         }
 1001                         switch (req) {
 1002                         case PT_TO_SCE:
 1003                                 p->p_ptevents |= PTRACE_SCE;
 1004                                 CTR4(KTR_PTRACE,
 1005                     "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
 1006                                     p->p_pid, p->p_ptevents,
 1007                                     (u_long)(uintfptr_t)addr, data);
 1008                                 break;
 1009                         case PT_TO_SCX:
 1010                                 p->p_ptevents |= PTRACE_SCX;
 1011                                 CTR4(KTR_PTRACE,
 1012                     "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
 1013                                     p->p_pid, p->p_ptevents,
 1014                                     (u_long)(uintfptr_t)addr, data);
 1015                                 break;
 1016                         case PT_SYSCALL:
 1017                                 p->p_ptevents |= PTRACE_SYSCALL;
 1018                                 CTR4(KTR_PTRACE,
 1019                     "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
 1020                                     p->p_pid, p->p_ptevents,
 1021                                     (u_long)(uintfptr_t)addr, data);
 1022                                 break;
 1023                         case PT_CONTINUE:
 1024                                 CTR3(KTR_PTRACE,
 1025                                     "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
 1026                                     p->p_pid, (u_long)(uintfptr_t)addr, data);
 1027                                 break;
 1028                         }
 1029                         break;
 1030                 case PT_DETACH:
 1031                         /*
 1032                          * Reset the process parent.
 1033                          *
 1034                          * NB: This clears P_TRACED before reparenting
 1035                          * a detached process back to its original
 1036                          * parent.  Otherwise the debugee will be set
 1037                          * as an orphan of the debugger.
 1038                          */
 1039                         p->p_flag &= ~(P_TRACED | P_WAITED);
 1040                         if (p->p_oppid != p->p_pptr->p_pid) {
 1041                                 PROC_LOCK(p->p_pptr);
 1042                                 sigqueue_take(p->p_ksi);
 1043                                 PROC_UNLOCK(p->p_pptr);
 1044 
 1045                                 pp = proc_realparent(p);
 1046                                 proc_reparent(p, pp);
 1047                                 if (pp == initproc)
 1048                                         p->p_sigparent = SIGCHLD;
 1049                                 CTR3(KTR_PTRACE,
 1050                             "PT_DETACH: pid %d reparented to pid %d, sig %d",
 1051                                     p->p_pid, pp->p_pid, data);
 1052                         } else
 1053                                 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
 1054                                     p->p_pid, data);
 1055                         p->p_oppid = 0;
 1056                         p->p_ptevents = 0;
 1057                         FOREACH_THREAD_IN_PROC(p, td3) {
 1058                                 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
 1059                                         sigqueue_delete(&td3->td_sigqueue,
 1060                                             SIGSTOP);
 1061                                 }
 1062                                 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP);
 1063                         }
 1064                         if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
 1065                                 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
 1066                                 p->p_flag2 &= ~P2_PTRACE_FSTP;
 1067                         }
 1068 
 1069                         /* should we send SIGCHLD? */
 1070                         /* childproc_continued(p); */
 1071                         break;
 1072                 }
 1073 
 1074         sendsig:
 1075                 /*
 1076                  * Clear the pending event for the thread that just
 1077                  * reported its event (p_xthread).  This may not be
 1078                  * the thread passed to PT_CONTINUE, PT_STEP, etc. if
 1079                  * the debugger is resuming a different thread.
 1080                  */
 1081                 td2 = p->p_xthread;
 1082                 if (proctree_locked) {
 1083                         sx_xunlock(&proctree_lock);
 1084                         proctree_locked = 0;
 1085                 }
 1086                 p->p_xstat = data;
 1087                 p->p_xthread = NULL;
 1088                 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
 1089                         /* deliver or queue signal */
 1090                         td2->td_dbgflags &= ~TDB_XSIG;
 1091                         td2->td_xsig = data;
 1092 
 1093                         /*
 1094                          * P_WKILLED is insurance that a PT_KILL/SIGKILL always
 1095                          * works immediately, even if another thread is
 1096                          * unsuspended first and attempts to handle a different
 1097                          * signal or if the POSIX.1b style signal queue cannot
 1098                          * accommodate any new signals.
 1099                          */
 1100                         if (data == SIGKILL)
 1101                                 p->p_flag |= P_WKILLED;
 1102 
 1103                         if (req == PT_DETACH) {
 1104                                 FOREACH_THREAD_IN_PROC(p, td3)
 1105                                         td3->td_dbgflags &= ~TDB_SUSPEND;
 1106                         }
 1107                         /*
 1108                          * unsuspend all threads, to not let a thread run,
 1109                          * you should use PT_SUSPEND to suspend it before
 1110                          * continuing process.
 1111                          */
 1112                         PROC_SLOCK(p);
 1113                         p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
 1114                         thread_unsuspend(p);
 1115                         PROC_SUNLOCK(p);
 1116                         if (req == PT_ATTACH)
 1117                                 kern_psignal(p, data);
 1118                 } else {
 1119                         if (data)
 1120                                 kern_psignal(p, data);
 1121                 }
 1122                 break;
 1123 
 1124         case PT_WRITE_I:
 1125         case PT_WRITE_D:
 1126                 td2->td_dbgflags |= TDB_USERWR;
 1127                 write = 1;
 1128                 /* FALLTHROUGH */
 1129         case PT_READ_I:
 1130         case PT_READ_D:
 1131                 PROC_UNLOCK(p);
 1132                 tmp = 0;
 1133                 /* write = 0 set above */
 1134                 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
 1135                 iov.iov_len = sizeof(int);
 1136                 uio.uio_iov = &iov;
 1137                 uio.uio_iovcnt = 1;
 1138                 uio.uio_offset = (off_t)(uintptr_t)addr;
 1139                 uio.uio_resid = sizeof(int);
 1140                 uio.uio_segflg = UIO_SYSSPACE;  /* i.e.: the uap */
 1141                 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
 1142                 uio.uio_td = td;
 1143                 error = proc_rwmem(p, &uio);
 1144                 if (uio.uio_resid != 0) {
 1145                         /*
 1146                          * XXX proc_rwmem() doesn't currently return ENOSPC,
 1147                          * so I think write() can bogusly return 0.
 1148                          * XXX what happens for short writes?  We don't want
 1149                          * to write partial data.
 1150                          * XXX proc_rwmem() returns EPERM for other invalid
 1151                          * addresses.  Convert this to EINVAL.  Does this
 1152                          * clobber returns of EPERM for other reasons?
 1153                          */
 1154                         if (error == 0 || error == ENOSPC || error == EPERM)
 1155                                 error = EINVAL; /* EOF */
 1156                 }
 1157                 if (!write)
 1158                         td->td_retval[0] = tmp;
 1159                 if (error == 0) {
 1160                         if (write)
 1161                                 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
 1162                                     p->p_pid, addr, data);
 1163                         else
 1164                                 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
 1165                                     p->p_pid, addr, tmp);
 1166                 }
 1167                 PROC_LOCK(p);
 1168                 break;
 1169 
 1170         case PT_IO:
 1171 #ifdef COMPAT_FREEBSD32
 1172                 if (wrap32) {
 1173                         piod32 = addr;
 1174                         iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
 1175                         iov.iov_len = piod32->piod_len;
 1176                         uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
 1177                         uio.uio_resid = piod32->piod_len;
 1178                 } else
 1179 #endif
 1180                 {
 1181                         piod = addr;
 1182                         iov.iov_base = piod->piod_addr;
 1183                         iov.iov_len = piod->piod_len;
 1184                         uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
 1185                         uio.uio_resid = piod->piod_len;
 1186                 }
 1187                 uio.uio_iov = &iov;
 1188                 uio.uio_iovcnt = 1;
 1189                 uio.uio_segflg = UIO_USERSPACE;
 1190                 uio.uio_td = td;
 1191 #ifdef COMPAT_FREEBSD32
 1192                 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
 1193 #else
 1194                 tmp = piod->piod_op;
 1195 #endif
 1196                 switch (tmp) {
 1197                 case PIOD_READ_D:
 1198                 case PIOD_READ_I:
 1199                         CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
 1200                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1201                         uio.uio_rw = UIO_READ;
 1202                         break;
 1203                 case PIOD_WRITE_D:
 1204                 case PIOD_WRITE_I:
 1205                         CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
 1206                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1207                         td2->td_dbgflags |= TDB_USERWR;
 1208                         uio.uio_rw = UIO_WRITE;
 1209                         break;
 1210                 default:
 1211                         error = EINVAL;
 1212                         goto out;
 1213                 }
 1214                 PROC_UNLOCK(p);
 1215                 error = proc_rwmem(p, &uio);
 1216 #ifdef COMPAT_FREEBSD32
 1217                 if (wrap32)
 1218                         piod32->piod_len -= uio.uio_resid;
 1219                 else
 1220 #endif
 1221                         piod->piod_len -= uio.uio_resid;
 1222                 PROC_LOCK(p);
 1223                 break;
 1224 
 1225         case PT_KILL:
 1226                 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
 1227                 data = SIGKILL;
 1228                 goto sendsig;   /* in PT_CONTINUE above */
 1229 
 1230         case PT_SETREGS:
 1231                 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
 1232                     p->p_pid);
 1233                 td2->td_dbgflags |= TDB_USERWR;
 1234                 error = PROC_WRITE(regs, td2, addr);
 1235                 break;
 1236 
 1237         case PT_GETREGS:
 1238                 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
 1239                     p->p_pid);
 1240                 error = PROC_READ(regs, td2, addr);
 1241                 break;
 1242 
 1243         case PT_SETFPREGS:
 1244                 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
 1245                     p->p_pid);
 1246                 td2->td_dbgflags |= TDB_USERWR;
 1247                 error = PROC_WRITE(fpregs, td2, addr);
 1248                 break;
 1249 
 1250         case PT_GETFPREGS:
 1251                 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
 1252                     p->p_pid);
 1253                 error = PROC_READ(fpregs, td2, addr);
 1254                 break;
 1255 
 1256         case PT_SETDBREGS:
 1257                 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
 1258                     p->p_pid);
 1259                 td2->td_dbgflags |= TDB_USERWR;
 1260                 error = PROC_WRITE(dbregs, td2, addr);
 1261                 break;
 1262 
 1263         case PT_GETDBREGS:
 1264                 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
 1265                     p->p_pid);
 1266                 error = PROC_READ(dbregs, td2, addr);
 1267                 break;
 1268 
 1269         case PT_LWPINFO:
 1270                 if (data <= 0 ||
 1271 #ifdef COMPAT_FREEBSD32
 1272                     (!wrap32 && data > sizeof(*pl)) ||
 1273                     (wrap32 && data > sizeof(*pl32))) {
 1274 #else
 1275                     data > sizeof(*pl)) {
 1276 #endif
 1277                         error = EINVAL;
 1278                         break;
 1279                 }
 1280 #ifdef COMPAT_FREEBSD32
 1281                 if (wrap32) {
 1282                         pl = &plr;
 1283                         pl32 = addr;
 1284                 } else
 1285 #endif
 1286                 pl = addr;
 1287                 bzero(pl, sizeof(*pl));
 1288                 pl->pl_lwpid = td2->td_tid;
 1289                 pl->pl_event = PL_EVENT_NONE;
 1290                 pl->pl_flags = 0;
 1291                 if (td2->td_dbgflags & TDB_XSIG) {
 1292                         pl->pl_event = PL_EVENT_SIGNAL;
 1293                         if (td2->td_dbgksi.ksi_signo != 0 &&
 1294 #ifdef COMPAT_FREEBSD32
 1295                             ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
 1296                             pl_siginfo) + sizeof(pl->pl_siginfo)) ||
 1297                             (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
 1298                             pl_siginfo) + sizeof(struct siginfo32)))
 1299 #else
 1300                             data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
 1301                             + sizeof(pl->pl_siginfo)
 1302 #endif
 1303                         ){
 1304                                 pl->pl_flags |= PL_FLAG_SI;
 1305                                 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
 1306                         }
 1307                 }
 1308                 if (td2->td_dbgflags & TDB_SCE)
 1309                         pl->pl_flags |= PL_FLAG_SCE;
 1310                 else if (td2->td_dbgflags & TDB_SCX)
 1311                         pl->pl_flags |= PL_FLAG_SCX;
 1312                 if (td2->td_dbgflags & TDB_EXEC)
 1313                         pl->pl_flags |= PL_FLAG_EXEC;
 1314                 if (td2->td_dbgflags & TDB_FORK) {
 1315                         pl->pl_flags |= PL_FLAG_FORKED;
 1316                         pl->pl_child_pid = td2->td_dbg_forked;
 1317                         if (td2->td_dbgflags & TDB_VFORK)
 1318                                 pl->pl_flags |= PL_FLAG_VFORKED;
 1319                 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
 1320                     TDB_VFORK)
 1321                         pl->pl_flags |= PL_FLAG_VFORK_DONE;
 1322                 if (td2->td_dbgflags & TDB_CHILD)
 1323                         pl->pl_flags |= PL_FLAG_CHILD;
 1324                 if (td2->td_dbgflags & TDB_BORN)
 1325                         pl->pl_flags |= PL_FLAG_BORN;
 1326                 if (td2->td_dbgflags & TDB_EXIT)
 1327                         pl->pl_flags |= PL_FLAG_EXITED;
 1328                 pl->pl_sigmask = td2->td_sigmask;
 1329                 pl->pl_siglist = td2->td_siglist;
 1330                 strcpy(pl->pl_tdname, td2->td_name);
 1331                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
 1332                         pl->pl_syscall_code = td2->td_dbg_sc_code;
 1333                         pl->pl_syscall_narg = td2->td_dbg_sc_narg;
 1334                 } else {
 1335                         pl->pl_syscall_code = 0;
 1336                         pl->pl_syscall_narg = 0;
 1337                 }
 1338 #ifdef COMPAT_FREEBSD32
 1339                 if (wrap32)
 1340                         ptrace_lwpinfo_to32(pl, pl32);
 1341 #endif
 1342                 CTR6(KTR_PTRACE,
 1343     "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
 1344                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
 1345                     pl->pl_child_pid, pl->pl_syscall_code);
 1346                 break;
 1347 
 1348         case PT_GETNUMLWPS:
 1349                 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
 1350                     p->p_numthreads);
 1351                 td->td_retval[0] = p->p_numthreads;
 1352                 break;
 1353 
 1354         case PT_GETLWPLIST:
 1355                 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
 1356                     p->p_pid, data, p->p_numthreads);
 1357                 if (data <= 0) {
 1358                         error = EINVAL;
 1359                         break;
 1360                 }
 1361                 num = imin(p->p_numthreads, data);
 1362                 PROC_UNLOCK(p);
 1363                 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
 1364                 tmp = 0;
 1365                 PROC_LOCK(p);
 1366                 FOREACH_THREAD_IN_PROC(p, td2) {
 1367                         if (tmp >= num)
 1368                                 break;
 1369                         buf[tmp++] = td2->td_tid;
 1370                 }
 1371                 PROC_UNLOCK(p);
 1372                 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
 1373                 free(buf, M_TEMP);
 1374                 if (!error)
 1375                         td->td_retval[0] = tmp;
 1376                 PROC_LOCK(p);
 1377                 break;
 1378 
 1379         case PT_VM_TIMESTAMP:
 1380                 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
 1381                     p->p_pid, p->p_vmspace->vm_map.timestamp);
 1382                 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
 1383                 break;
 1384 
 1385         case PT_VM_ENTRY:
 1386                 PROC_UNLOCK(p);
 1387 #ifdef COMPAT_FREEBSD32
 1388                 if (wrap32)
 1389                         error = ptrace_vm_entry32(td, p, addr);
 1390                 else
 1391 #endif
 1392                 error = ptrace_vm_entry(td, p, addr);
 1393                 PROC_LOCK(p);
 1394                 break;
 1395 
 1396         default:
 1397 #ifdef __HAVE_PTRACE_MACHDEP
 1398                 if (req >= PT_FIRSTMACH) {
 1399                         PROC_UNLOCK(p);
 1400                         error = cpu_ptrace(td2, req, addr, data);
 1401                         PROC_LOCK(p);
 1402                 } else
 1403 #endif
 1404                         /* Unknown request. */
 1405                         error = EINVAL;
 1406                 break;
 1407         }
 1408 
 1409 out:
 1410         /* Drop our hold on this process now that the request has completed. */
 1411         _PRELE(p);
 1412 fail:
 1413         PROC_UNLOCK(p);
 1414         if (proctree_locked)
 1415                 sx_xunlock(&proctree_lock);
 1416         return (error);
 1417 }
 1418 #undef PROC_READ
 1419 #undef PROC_WRITE
 1420 
 1421 /*
 1422  * Stop a process because of a debugging event;
 1423  * stay stopped until p->p_step is cleared
 1424  * (cleared by PIOCCONT in procfs).
 1425  */
 1426 void
 1427 stopevent(struct proc *p, unsigned int event, unsigned int val)
 1428 {
 1429 
 1430         PROC_LOCK_ASSERT(p, MA_OWNED);
 1431         p->p_step = 1;
 1432         CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
 1433             val);
 1434         do {
 1435                 p->p_xstat = val;
 1436                 p->p_xthread = NULL;
 1437                 p->p_stype = event;     /* Which event caused the stop? */
 1438                 wakeup(&p->p_stype);    /* Wake up any PIOCWAIT'ing procs */
 1439                 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
 1440         } while (p->p_step);
 1441 }

Cache object: 44290c72f7d13c50a402b0906c61184e


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