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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1994, Sean Eric Fagan
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Sean Eric Fagan.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/12.0/sys/kern/sys_process.c 341603 2018-12-05 19:16:12Z gjb $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/lock.h>
   40 #include <sys/mutex.h>
   41 #include <sys/syscallsubr.h>
   42 #include <sys/sysent.h>
   43 #include <sys/sysproto.h>
   44 #include <sys/pioctl.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/vnode.h>
   48 #include <sys/ptrace.h>
   49 #include <sys/rwlock.h>
   50 #include <sys/sx.h>
   51 #include <sys/malloc.h>
   52 #include <sys/signalvar.h>
   53 
   54 #include <machine/reg.h>
   55 
   56 #include <security/audit/audit.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <vm/vm_extern.h>
   61 #include <vm/vm_map.h>
   62 #include <vm/vm_kern.h>
   63 #include <vm/vm_object.h>
   64 #include <vm/vm_page.h>
   65 #include <vm/vm_param.h>
   66 
   67 #ifdef COMPAT_FREEBSD32
   68 #include <sys/procfs.h>
   69 #include <compat/freebsd32/freebsd32_signal.h>
   70 
   71 struct ptrace_io_desc32 {
   72         int             piod_op;
   73         uint32_t        piod_offs;
   74         uint32_t        piod_addr;
   75         uint32_t        piod_len;
   76 };
   77 
   78 struct ptrace_vm_entry32 {
   79         int             pve_entry;
   80         int             pve_timestamp;
   81         uint32_t        pve_start;
   82         uint32_t        pve_end;
   83         uint32_t        pve_offset;
   84         u_int           pve_prot;
   85         u_int           pve_pathlen;
   86         int32_t         pve_fileid;
   87         u_int           pve_fsid;
   88         uint32_t        pve_path;
   89 };
   90 #endif
   91 
   92 /*
   93  * Functions implemented using PROC_ACTION():
   94  *
   95  * proc_read_regs(proc, regs)
   96  *      Get the current user-visible register set from the process
   97  *      and copy it into the regs structure (<machine/reg.h>).
   98  *      The process is stopped at the time read_regs is called.
   99  *
  100  * proc_write_regs(proc, regs)
  101  *      Update the current register set from the passed in regs
  102  *      structure.  Take care to avoid clobbering special CPU
  103  *      registers or privileged bits in the PSL.
  104  *      Depending on the architecture this may have fix-up work to do,
  105  *      especially if the IAR or PCW are modified.
  106  *      The process is stopped at the time write_regs is called.
  107  *
  108  * proc_read_fpregs, proc_write_fpregs
  109  *      deal with the floating point register set, otherwise as above.
  110  *
  111  * proc_read_dbregs, proc_write_dbregs
  112  *      deal with the processor debug register set, otherwise as above.
  113  *
  114  * proc_sstep(proc)
  115  *      Arrange for the process to trap after executing a single instruction.
  116  */
  117 
  118 #define PROC_ACTION(action) do {                                        \
  119         int error;                                                      \
  120                                                                         \
  121         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);                        \
  122         if ((td->td_proc->p_flag & P_INMEM) == 0)                       \
  123                 error = EIO;                                            \
  124         else                                                            \
  125                 error = (action);                                       \
  126         return (error);                                                 \
  127 } while(0)
  128 
  129 int
  130 proc_read_regs(struct thread *td, struct reg *regs)
  131 {
  132 
  133         PROC_ACTION(fill_regs(td, regs));
  134 }
  135 
  136 int
  137 proc_write_regs(struct thread *td, struct reg *regs)
  138 {
  139 
  140         PROC_ACTION(set_regs(td, regs));
  141 }
  142 
  143 int
  144 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
  145 {
  146 
  147         PROC_ACTION(fill_dbregs(td, dbregs));
  148 }
  149 
  150 int
  151 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
  152 {
  153 
  154         PROC_ACTION(set_dbregs(td, dbregs));
  155 }
  156 
  157 /*
  158  * Ptrace doesn't support fpregs at all, and there are no security holes
  159  * or translations for fpregs, so we can just copy them.
  160  */
  161 int
  162 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
  163 {
  164 
  165         PROC_ACTION(fill_fpregs(td, fpregs));
  166 }
  167 
  168 int
  169 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
  170 {
  171 
  172         PROC_ACTION(set_fpregs(td, fpregs));
  173 }
  174 
  175 #ifdef COMPAT_FREEBSD32
  176 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
  177 int
  178 proc_read_regs32(struct thread *td, struct reg32 *regs32)
  179 {
  180 
  181         PROC_ACTION(fill_regs32(td, regs32));
  182 }
  183 
  184 int
  185 proc_write_regs32(struct thread *td, struct reg32 *regs32)
  186 {
  187 
  188         PROC_ACTION(set_regs32(td, regs32));
  189 }
  190 
  191 int
  192 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  193 {
  194 
  195         PROC_ACTION(fill_dbregs32(td, dbregs32));
  196 }
  197 
  198 int
  199 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
  200 {
  201 
  202         PROC_ACTION(set_dbregs32(td, dbregs32));
  203 }
  204 
  205 int
  206 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  207 {
  208 
  209         PROC_ACTION(fill_fpregs32(td, fpregs32));
  210 }
  211 
  212 int
  213 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
  214 {
  215 
  216         PROC_ACTION(set_fpregs32(td, fpregs32));
  217 }
  218 #endif
  219 
  220 int
  221 proc_sstep(struct thread *td)
  222 {
  223 
  224         PROC_ACTION(ptrace_single_step(td));
  225 }
  226 
  227 int
  228 proc_rwmem(struct proc *p, struct uio *uio)
  229 {
  230         vm_map_t map;
  231         vm_offset_t pageno;             /* page number */
  232         vm_prot_t reqprot;
  233         int error, fault_flags, page_offset, writing;
  234 
  235         /*
  236          * Assert that someone has locked this vmspace.  (Should be
  237          * curthread but we can't assert that.)  This keeps the process
  238          * from exiting out from under us until this operation completes.
  239          */
  240         PROC_ASSERT_HELD(p);
  241         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  242 
  243         /*
  244          * The map we want...
  245          */
  246         map = &p->p_vmspace->vm_map;
  247 
  248         /*
  249          * If we are writing, then we request vm_fault() to create a private
  250          * copy of each page.  Since these copies will not be writeable by the
  251          * process, we must explicity request that they be dirtied.
  252          */
  253         writing = uio->uio_rw == UIO_WRITE;
  254         reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
  255         fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
  256 
  257         /*
  258          * Only map in one page at a time.  We don't have to, but it
  259          * makes things easier.  This way is trivial - right?
  260          */
  261         do {
  262                 vm_offset_t uva;
  263                 u_int len;
  264                 vm_page_t m;
  265 
  266                 uva = (vm_offset_t)uio->uio_offset;
  267 
  268                 /*
  269                  * Get the page number of this segment.
  270                  */
  271                 pageno = trunc_page(uva);
  272                 page_offset = uva - pageno;
  273 
  274                 /*
  275                  * How many bytes to copy
  276                  */
  277                 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
  278 
  279                 /*
  280                  * Fault and hold the page on behalf of the process.
  281                  */
  282                 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
  283                 if (error != KERN_SUCCESS) {
  284                         if (error == KERN_RESOURCE_SHORTAGE)
  285                                 error = ENOMEM;
  286                         else
  287                                 error = EFAULT;
  288                         break;
  289                 }
  290 
  291                 /*
  292                  * Now do the i/o move.
  293                  */
  294                 error = uiomove_fromphys(&m, page_offset, len, uio);
  295 
  296                 /* Make the I-cache coherent for breakpoints. */
  297                 if (writing && error == 0) {
  298                         vm_map_lock_read(map);
  299                         if (vm_map_check_protection(map, pageno, pageno +
  300                             PAGE_SIZE, VM_PROT_EXECUTE))
  301                                 vm_sync_icache(map, uva, len);
  302                         vm_map_unlock_read(map);
  303                 }
  304 
  305                 /*
  306                  * Release the page.
  307                  */
  308                 vm_page_lock(m);
  309                 vm_page_unhold(m);
  310                 vm_page_unlock(m);
  311 
  312         } while (error == 0 && uio->uio_resid > 0);
  313 
  314         return (error);
  315 }
  316 
  317 static ssize_t
  318 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  319     size_t len, enum uio_rw rw)
  320 {
  321         struct iovec iov;
  322         struct uio uio;
  323         ssize_t slen;
  324 
  325         MPASS(len < SSIZE_MAX);
  326         slen = (ssize_t)len;
  327 
  328         iov.iov_base = (caddr_t)buf;
  329         iov.iov_len = len;
  330         uio.uio_iov = &iov;
  331         uio.uio_iovcnt = 1;
  332         uio.uio_offset = va;
  333         uio.uio_resid = slen;
  334         uio.uio_segflg = UIO_SYSSPACE;
  335         uio.uio_rw = rw;
  336         uio.uio_td = td;
  337         proc_rwmem(p, &uio);
  338         if (uio.uio_resid == slen)
  339                 return (-1);
  340         return (slen - uio.uio_resid);
  341 }
  342 
  343 ssize_t
  344 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  345     size_t len)
  346 {
  347 
  348         return (proc_iop(td, p, va, buf, len, UIO_READ));
  349 }
  350 
  351 ssize_t
  352 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
  353     size_t len)
  354 {
  355 
  356         return (proc_iop(td, p, va, buf, len, UIO_WRITE));
  357 }
  358 
  359 static int
  360 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
  361 {
  362         struct vattr vattr;
  363         vm_map_t map;
  364         vm_map_entry_t entry;
  365         vm_object_t obj, tobj, lobj;
  366         struct vmspace *vm;
  367         struct vnode *vp;
  368         char *freepath, *fullpath;
  369         u_int pathlen;
  370         int error, index;
  371 
  372         error = 0;
  373         obj = NULL;
  374 
  375         vm = vmspace_acquire_ref(p);
  376         map = &vm->vm_map;
  377         vm_map_lock_read(map);
  378 
  379         do {
  380                 entry = map->header.next;
  381                 index = 0;
  382                 while (index < pve->pve_entry && entry != &map->header) {
  383                         entry = entry->next;
  384                         index++;
  385                 }
  386                 if (index != pve->pve_entry) {
  387                         error = EINVAL;
  388                         break;
  389                 }
  390                 while (entry != &map->header &&
  391                     (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
  392                         entry = entry->next;
  393                         index++;
  394                 }
  395                 if (entry == &map->header) {
  396                         error = ENOENT;
  397                         break;
  398                 }
  399 
  400                 /* We got an entry. */
  401                 pve->pve_entry = index + 1;
  402                 pve->pve_timestamp = map->timestamp;
  403                 pve->pve_start = entry->start;
  404                 pve->pve_end = entry->end - 1;
  405                 pve->pve_offset = entry->offset;
  406                 pve->pve_prot = entry->protection;
  407 
  408                 /* Backing object's path needed? */
  409                 if (pve->pve_pathlen == 0)
  410                         break;
  411 
  412                 pathlen = pve->pve_pathlen;
  413                 pve->pve_pathlen = 0;
  414 
  415                 obj = entry->object.vm_object;
  416                 if (obj != NULL)
  417                         VM_OBJECT_RLOCK(obj);
  418         } while (0);
  419 
  420         vm_map_unlock_read(map);
  421 
  422         pve->pve_fsid = VNOVAL;
  423         pve->pve_fileid = VNOVAL;
  424 
  425         if (error == 0 && obj != NULL) {
  426                 lobj = obj;
  427                 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
  428                         if (tobj != obj)
  429                                 VM_OBJECT_RLOCK(tobj);
  430                         if (lobj != obj)
  431                                 VM_OBJECT_RUNLOCK(lobj);
  432                         lobj = tobj;
  433                         pve->pve_offset += tobj->backing_object_offset;
  434                 }
  435                 vp = vm_object_vnode(lobj);
  436                 if (vp != NULL)
  437                         vref(vp);
  438                 if (lobj != obj)
  439                         VM_OBJECT_RUNLOCK(lobj);
  440                 VM_OBJECT_RUNLOCK(obj);
  441 
  442                 if (vp != NULL) {
  443                         freepath = NULL;
  444                         fullpath = NULL;
  445                         vn_fullpath(td, vp, &fullpath, &freepath);
  446                         vn_lock(vp, LK_SHARED | LK_RETRY);
  447                         if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
  448                                 pve->pve_fileid = vattr.va_fileid;
  449                                 pve->pve_fsid = vattr.va_fsid;
  450                         }
  451                         vput(vp);
  452 
  453                         if (fullpath != NULL) {
  454                                 pve->pve_pathlen = strlen(fullpath) + 1;
  455                                 if (pve->pve_pathlen <= pathlen) {
  456                                         error = copyout(fullpath, pve->pve_path,
  457                                             pve->pve_pathlen);
  458                                 } else
  459                                         error = ENAMETOOLONG;
  460                         }
  461                         if (freepath != NULL)
  462                                 free(freepath, M_TEMP);
  463                 }
  464         }
  465         vmspace_free(vm);
  466         if (error == 0)
  467                 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
  468                     p->p_pid, pve->pve_entry, pve->pve_start);
  469 
  470         return (error);
  471 }
  472 
  473 #ifdef COMPAT_FREEBSD32
  474 static int
  475 ptrace_vm_entry32(struct thread *td, struct proc *p,
  476     struct ptrace_vm_entry32 *pve32)
  477 {
  478         struct ptrace_vm_entry pve;
  479         int error;
  480 
  481         pve.pve_entry = pve32->pve_entry;
  482         pve.pve_pathlen = pve32->pve_pathlen;
  483         pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
  484 
  485         error = ptrace_vm_entry(td, p, &pve);
  486         if (error == 0) {
  487                 pve32->pve_entry = pve.pve_entry;
  488                 pve32->pve_timestamp = pve.pve_timestamp;
  489                 pve32->pve_start = pve.pve_start;
  490                 pve32->pve_end = pve.pve_end;
  491                 pve32->pve_offset = pve.pve_offset;
  492                 pve32->pve_prot = pve.pve_prot;
  493                 pve32->pve_fileid = pve.pve_fileid;
  494                 pve32->pve_fsid = pve.pve_fsid;
  495         }
  496 
  497         pve32->pve_pathlen = pve.pve_pathlen;
  498         return (error);
  499 }
  500 
  501 static void
  502 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
  503     struct ptrace_lwpinfo32 *pl32)
  504 {
  505 
  506         bzero(pl32, sizeof(*pl32));
  507         pl32->pl_lwpid = pl->pl_lwpid;
  508         pl32->pl_event = pl->pl_event;
  509         pl32->pl_flags = pl->pl_flags;
  510         pl32->pl_sigmask = pl->pl_sigmask;
  511         pl32->pl_siglist = pl->pl_siglist;
  512         siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
  513         strcpy(pl32->pl_tdname, pl->pl_tdname);
  514         pl32->pl_child_pid = pl->pl_child_pid;
  515         pl32->pl_syscall_code = pl->pl_syscall_code;
  516         pl32->pl_syscall_narg = pl->pl_syscall_narg;
  517 }
  518 #endif /* COMPAT_FREEBSD32 */
  519 
  520 /*
  521  * Process debugging system call.
  522  */
  523 #ifndef _SYS_SYSPROTO_H_
  524 struct ptrace_args {
  525         int     req;
  526         pid_t   pid;
  527         caddr_t addr;
  528         int     data;
  529 };
  530 #endif
  531 
  532 #ifdef COMPAT_FREEBSD32
  533 /*
  534  * This CPP subterfuge is to try and reduce the number of ifdefs in
  535  * the body of the code.
  536  *   COPYIN(uap->addr, &r.reg, sizeof r.reg);
  537  * becomes either:
  538  *   copyin(uap->addr, &r.reg, sizeof r.reg);
  539  * or
  540  *   copyin(uap->addr, &r.reg32, sizeof r.reg32);
  541  * .. except this is done at runtime.
  542  */
  543 #define BZERO(a, s)             wrap32 ? \
  544         bzero(a ## 32, s ## 32) : \
  545         bzero(a, s)
  546 #define COPYIN(u, k, s)         wrap32 ? \
  547         copyin(u, k ## 32, s ## 32) : \
  548         copyin(u, k, s)
  549 #define COPYOUT(k, u, s)        wrap32 ? \
  550         copyout(k ## 32, u, s ## 32) : \
  551         copyout(k, u, s)
  552 #else
  553 #define BZERO(a, s)             bzero(a, s)
  554 #define COPYIN(u, k, s)         copyin(u, k, s)
  555 #define COPYOUT(k, u, s)        copyout(k, u, s)
  556 #endif
  557 int
  558 sys_ptrace(struct thread *td, struct ptrace_args *uap)
  559 {
  560         /*
  561          * XXX this obfuscation is to reduce stack usage, but the register
  562          * structs may be too large to put on the stack anyway.
  563          */
  564         union {
  565                 struct ptrace_io_desc piod;
  566                 struct ptrace_lwpinfo pl;
  567                 struct ptrace_vm_entry pve;
  568                 struct dbreg dbreg;
  569                 struct fpreg fpreg;
  570                 struct reg reg;
  571 #ifdef COMPAT_FREEBSD32
  572                 struct dbreg32 dbreg32;
  573                 struct fpreg32 fpreg32;
  574                 struct reg32 reg32;
  575                 struct ptrace_io_desc32 piod32;
  576                 struct ptrace_lwpinfo32 pl32;
  577                 struct ptrace_vm_entry32 pve32;
  578 #endif
  579                 char args[sizeof(td->td_sa.args)];
  580                 int ptevents;
  581         } r;
  582         void *addr;
  583         int error = 0;
  584 #ifdef COMPAT_FREEBSD32
  585         int wrap32 = 0;
  586 
  587         if (SV_CURPROC_FLAG(SV_ILP32))
  588                 wrap32 = 1;
  589 #endif
  590         AUDIT_ARG_PID(uap->pid);
  591         AUDIT_ARG_CMD(uap->req);
  592         AUDIT_ARG_VALUE(uap->data);
  593         addr = &r;
  594         switch (uap->req) {
  595         case PT_GET_EVENT_MASK:
  596         case PT_LWPINFO:
  597         case PT_GET_SC_ARGS:
  598                 break;
  599         case PT_GETREGS:
  600                 BZERO(&r.reg, sizeof r.reg);
  601                 break;
  602         case PT_GETFPREGS:
  603                 BZERO(&r.fpreg, sizeof r.fpreg);
  604                 break;
  605         case PT_GETDBREGS:
  606                 BZERO(&r.dbreg, sizeof r.dbreg);
  607                 break;
  608         case PT_SETREGS:
  609                 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
  610                 break;
  611         case PT_SETFPREGS:
  612                 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
  613                 break;
  614         case PT_SETDBREGS:
  615                 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
  616                 break;
  617         case PT_SET_EVENT_MASK:
  618                 if (uap->data != sizeof(r.ptevents))
  619                         error = EINVAL;
  620                 else
  621                         error = copyin(uap->addr, &r.ptevents, uap->data);
  622                 break;
  623         case PT_IO:
  624                 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
  625                 break;
  626         case PT_VM_ENTRY:
  627                 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
  628                 break;
  629         default:
  630                 addr = uap->addr;
  631                 break;
  632         }
  633         if (error)
  634                 return (error);
  635 
  636         error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
  637         if (error)
  638                 return (error);
  639 
  640         switch (uap->req) {
  641         case PT_VM_ENTRY:
  642                 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
  643                 break;
  644         case PT_IO:
  645                 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
  646                 break;
  647         case PT_GETREGS:
  648                 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
  649                 break;
  650         case PT_GETFPREGS:
  651                 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
  652                 break;
  653         case PT_GETDBREGS:
  654                 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
  655                 break;
  656         case PT_GET_EVENT_MASK:
  657                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  658                 error = copyout(&r.ptevents, uap->addr, uap->data);
  659                 break;
  660         case PT_LWPINFO:
  661                 /* NB: The size in uap->data is validated in kern_ptrace(). */
  662                 error = copyout(&r.pl, uap->addr, uap->data);
  663                 break;
  664         case PT_GET_SC_ARGS:
  665                 error = copyout(r.args, uap->addr, MIN(uap->data,
  666                     sizeof(r.args)));
  667                 break;
  668         }
  669 
  670         return (error);
  671 }
  672 #undef COPYIN
  673 #undef COPYOUT
  674 #undef BZERO
  675 
  676 #ifdef COMPAT_FREEBSD32
  677 /*
  678  *   PROC_READ(regs, td2, addr);
  679  * becomes either:
  680  *   proc_read_regs(td2, addr);
  681  * or
  682  *   proc_read_regs32(td2, addr);
  683  * .. except this is done at runtime.  There is an additional
  684  * complication in that PROC_WRITE disallows 32 bit consumers
  685  * from writing to 64 bit address space targets.
  686  */
  687 #define PROC_READ(w, t, a)      wrap32 ? \
  688         proc_read_ ## w ## 32(t, a) : \
  689         proc_read_ ## w (t, a)
  690 #define PROC_WRITE(w, t, a)     wrap32 ? \
  691         (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
  692         proc_write_ ## w (t, a)
  693 #else
  694 #define PROC_READ(w, t, a)      proc_read_ ## w (t, a)
  695 #define PROC_WRITE(w, t, a)     proc_write_ ## w (t, a)
  696 #endif
  697 
  698 void
  699 proc_set_traced(struct proc *p, bool stop)
  700 {
  701 
  702         sx_assert(&proctree_lock, SX_XLOCKED);
  703         PROC_LOCK_ASSERT(p, MA_OWNED);
  704         p->p_flag |= P_TRACED;
  705         if (stop)
  706                 p->p_flag2 |= P2_PTRACE_FSTP;
  707         p->p_ptevents = PTRACE_DEFAULT;
  708         p->p_oppid = p->p_pptr->p_pid;
  709 }
  710 
  711 int
  712 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
  713 {
  714         struct iovec iov;
  715         struct uio uio;
  716         struct proc *curp, *p, *pp;
  717         struct thread *td2 = NULL, *td3;
  718         struct ptrace_io_desc *piod = NULL;
  719         struct ptrace_lwpinfo *pl;
  720         int error, num, tmp;
  721         int proctree_locked = 0;
  722         lwpid_t tid = 0, *buf;
  723 #ifdef COMPAT_FREEBSD32
  724         int wrap32 = 0, safe = 0;
  725         struct ptrace_io_desc32 *piod32 = NULL;
  726         struct ptrace_lwpinfo32 *pl32 = NULL;
  727         struct ptrace_lwpinfo plr;
  728 #endif
  729 
  730         curp = td->td_proc;
  731 
  732         /* Lock proctree before locking the process. */
  733         switch (req) {
  734         case PT_TRACE_ME:
  735         case PT_ATTACH:
  736         case PT_STEP:
  737         case PT_CONTINUE:
  738         case PT_TO_SCE:
  739         case PT_TO_SCX:
  740         case PT_SYSCALL:
  741         case PT_FOLLOW_FORK:
  742         case PT_LWP_EVENTS:
  743         case PT_GET_EVENT_MASK:
  744         case PT_SET_EVENT_MASK:
  745         case PT_DETACH:
  746         case PT_GET_SC_ARGS:
  747                 sx_xlock(&proctree_lock);
  748                 proctree_locked = 1;
  749                 break;
  750         default:
  751                 break;
  752         }
  753 
  754         if (req == PT_TRACE_ME) {
  755                 p = td->td_proc;
  756                 PROC_LOCK(p);
  757         } else {
  758                 if (pid <= PID_MAX) {
  759                         if ((p = pfind(pid)) == NULL) {
  760                                 if (proctree_locked)
  761                                         sx_xunlock(&proctree_lock);
  762                                 return (ESRCH);
  763                         }
  764                 } else {
  765                         td2 = tdfind(pid, -1);
  766                         if (td2 == NULL) {
  767                                 if (proctree_locked)
  768                                         sx_xunlock(&proctree_lock);
  769                                 return (ESRCH);
  770                         }
  771                         p = td2->td_proc;
  772                         tid = pid;
  773                         pid = p->p_pid;
  774                 }
  775         }
  776         AUDIT_ARG_PROCESS(p);
  777 
  778         if ((p->p_flag & P_WEXIT) != 0) {
  779                 error = ESRCH;
  780                 goto fail;
  781         }
  782         if ((error = p_cansee(td, p)) != 0)
  783                 goto fail;
  784 
  785         if ((error = p_candebug(td, p)) != 0)
  786                 goto fail;
  787 
  788         /*
  789          * System processes can't be debugged.
  790          */
  791         if ((p->p_flag & P_SYSTEM) != 0) {
  792                 error = EINVAL;
  793                 goto fail;
  794         }
  795 
  796         if (tid == 0) {
  797                 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
  798                         KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
  799                         td2 = p->p_xthread;
  800                 } else {
  801                         td2 = FIRST_THREAD_IN_PROC(p);
  802                 }
  803                 tid = td2->td_tid;
  804         }
  805 
  806 #ifdef COMPAT_FREEBSD32
  807         /*
  808          * Test if we're a 32 bit client and what the target is.
  809          * Set the wrap controls accordingly.
  810          */
  811         if (SV_CURPROC_FLAG(SV_ILP32)) {
  812                 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
  813                         safe = 1;
  814                 wrap32 = 1;
  815         }
  816 #endif
  817         /*
  818          * Permissions check
  819          */
  820         switch (req) {
  821         case PT_TRACE_ME:
  822                 /*
  823                  * Always legal, when there is a parent process which
  824                  * could trace us.  Otherwise, reject.
  825                  */
  826                 if ((p->p_flag & P_TRACED) != 0) {
  827                         error = EBUSY;
  828                         goto fail;
  829                 }
  830                 if (p->p_pptr == initproc) {
  831                         error = EPERM;
  832                         goto fail;
  833                 }
  834                 break;
  835 
  836         case PT_ATTACH:
  837                 /* Self */
  838                 if (p == td->td_proc) {
  839                         error = EINVAL;
  840                         goto fail;
  841                 }
  842 
  843                 /* Already traced */
  844                 if (p->p_flag & P_TRACED) {
  845                         error = EBUSY;
  846                         goto fail;
  847                 }
  848 
  849                 /* Can't trace an ancestor if you're being traced. */
  850                 if (curp->p_flag & P_TRACED) {
  851                         for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
  852                                 if (pp == p) {
  853                                         error = EINVAL;
  854                                         goto fail;
  855                                 }
  856                         }
  857                 }
  858 
  859 
  860                 /* OK */
  861                 break;
  862 
  863         case PT_CLEARSTEP:
  864                 /* Allow thread to clear single step for itself */
  865                 if (td->td_tid == tid)
  866                         break;
  867 
  868                 /* FALLTHROUGH */
  869         default:
  870                 /* not being traced... */
  871                 if ((p->p_flag & P_TRACED) == 0) {
  872                         error = EPERM;
  873                         goto fail;
  874                 }
  875 
  876                 /* not being traced by YOU */
  877                 if (p->p_pptr != td->td_proc) {
  878                         error = EBUSY;
  879                         goto fail;
  880                 }
  881 
  882                 /* not currently stopped */
  883                 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
  884                     p->p_suspcount != p->p_numthreads  ||
  885                     (p->p_flag & P_WAITED) == 0) {
  886                         error = EBUSY;
  887                         goto fail;
  888                 }
  889 
  890                 /* OK */
  891                 break;
  892         }
  893 
  894         /* Keep this process around until we finish this request. */
  895         _PHOLD(p);
  896 
  897 #ifdef FIX_SSTEP
  898         /*
  899          * Single step fixup ala procfs
  900          */
  901         FIX_SSTEP(td2);
  902 #endif
  903 
  904         /*
  905          * Actually do the requests
  906          */
  907 
  908         td->td_retval[0] = 0;
  909 
  910         switch (req) {
  911         case PT_TRACE_ME:
  912                 /* set my trace flag and "owner" so it can read/write me */
  913                 proc_set_traced(p, false);
  914                 if (p->p_flag & P_PPWAIT)
  915                         p->p_flag |= P_PPTRACE;
  916                 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
  917                 break;
  918 
  919         case PT_ATTACH:
  920                 /* security check done above */
  921                 /*
  922                  * It would be nice if the tracing relationship was separate
  923                  * from the parent relationship but that would require
  924                  * another set of links in the proc struct or for "wait"
  925                  * to scan the entire proc table.  To make life easier,
  926                  * we just re-parent the process we're trying to trace.
  927                  * The old parent is remembered so we can put things back
  928                  * on a "detach".
  929                  */
  930                 proc_set_traced(p, true);
  931                 if (p->p_pptr != td->td_proc) {
  932                         proc_reparent(p, td->td_proc);
  933                 }
  934                 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
  935                     p->p_oppid);
  936 
  937                 sx_xunlock(&proctree_lock);
  938                 proctree_locked = 0;
  939                 MPASS(p->p_xthread == NULL);
  940                 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
  941 
  942                 /*
  943                  * If already stopped due to a stop signal, clear the
  944                  * existing stop before triggering a traced SIGSTOP.
  945                  */
  946                 if ((p->p_flag & P_STOPPED_SIG) != 0) {
  947                         PROC_SLOCK(p);
  948                         p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
  949                         thread_unsuspend(p);
  950                         PROC_SUNLOCK(p);
  951                 }
  952 
  953                 kern_psignal(p, SIGSTOP);
  954                 break;
  955 
  956         case PT_CLEARSTEP:
  957                 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
  958                     p->p_pid);
  959                 error = ptrace_clear_single_step(td2);
  960                 break;
  961 
  962         case PT_SETSTEP:
  963                 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
  964                     p->p_pid);
  965                 error = ptrace_single_step(td2);
  966                 break;
  967 
  968         case PT_SUSPEND:
  969                 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
  970                     p->p_pid);
  971                 td2->td_dbgflags |= TDB_SUSPEND;
  972                 thread_lock(td2);
  973                 td2->td_flags |= TDF_NEEDSUSPCHK;
  974                 thread_unlock(td2);
  975                 break;
  976 
  977         case PT_RESUME:
  978                 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
  979                     p->p_pid);
  980                 td2->td_dbgflags &= ~TDB_SUSPEND;
  981                 break;
  982 
  983         case PT_FOLLOW_FORK:
  984                 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
  985                     p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
  986                     data ? "enabled" : "disabled");
  987                 if (data)
  988                         p->p_ptevents |= PTRACE_FORK;
  989                 else
  990                         p->p_ptevents &= ~PTRACE_FORK;
  991                 break;
  992 
  993         case PT_LWP_EVENTS:
  994                 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
  995                     p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
  996                     data ? "enabled" : "disabled");
  997                 if (data)
  998                         p->p_ptevents |= PTRACE_LWP;
  999                 else
 1000                         p->p_ptevents &= ~PTRACE_LWP;
 1001                 break;
 1002 
 1003         case PT_GET_EVENT_MASK:
 1004                 if (data != sizeof(p->p_ptevents)) {
 1005                         error = EINVAL;
 1006                         break;
 1007                 }
 1008                 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
 1009                     p->p_ptevents);
 1010                 *(int *)addr = p->p_ptevents;
 1011                 break;
 1012 
 1013         case PT_SET_EVENT_MASK:
 1014                 if (data != sizeof(p->p_ptevents)) {
 1015                         error = EINVAL;
 1016                         break;
 1017                 }
 1018                 tmp = *(int *)addr;
 1019                 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
 1020                     PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
 1021                         error = EINVAL;
 1022                         break;
 1023                 }
 1024                 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
 1025                     p->p_pid, p->p_ptevents, tmp);
 1026                 p->p_ptevents = tmp;
 1027                 break;
 1028 
 1029         case PT_GET_SC_ARGS:
 1030                 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
 1031                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
 1032 #ifdef COMPAT_FREEBSD32
 1033                     || (wrap32 && !safe)
 1034 #endif
 1035                     ) {
 1036                         error = EINVAL;
 1037                         break;
 1038                 }
 1039                 bzero(addr, sizeof(td2->td_sa.args));
 1040 #ifdef COMPAT_FREEBSD32
 1041                 if (wrap32)
 1042                         for (num = 0; num < nitems(td2->td_sa.args); num++)
 1043                                 ((uint32_t *)addr)[num] = (uint32_t)
 1044                                     td2->td_sa.args[num];
 1045                 else
 1046 #endif
 1047                         bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
 1048                             sizeof(register_t));
 1049                 break;
 1050                 
 1051         case PT_STEP:
 1052         case PT_CONTINUE:
 1053         case PT_TO_SCE:
 1054         case PT_TO_SCX:
 1055         case PT_SYSCALL:
 1056         case PT_DETACH:
 1057                 /* Zero means do not send any signal */
 1058                 if (data < 0 || data > _SIG_MAXSIG) {
 1059                         error = EINVAL;
 1060                         break;
 1061                 }
 1062 
 1063                 switch (req) {
 1064                 case PT_STEP:
 1065                         CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
 1066                             td2->td_tid, p->p_pid, data);
 1067                         error = ptrace_single_step(td2);
 1068                         if (error)
 1069                                 goto out;
 1070                         break;
 1071                 case PT_CONTINUE:
 1072                 case PT_TO_SCE:
 1073                 case PT_TO_SCX:
 1074                 case PT_SYSCALL:
 1075                         if (addr != (void *)1) {
 1076                                 error = ptrace_set_pc(td2,
 1077                                     (u_long)(uintfptr_t)addr);
 1078                                 if (error)
 1079                                         goto out;
 1080                         }
 1081                         switch (req) {
 1082                         case PT_TO_SCE:
 1083                                 p->p_ptevents |= PTRACE_SCE;
 1084                                 CTR4(KTR_PTRACE,
 1085                     "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
 1086                                     p->p_pid, p->p_ptevents,
 1087                                     (u_long)(uintfptr_t)addr, data);
 1088                                 break;
 1089                         case PT_TO_SCX:
 1090                                 p->p_ptevents |= PTRACE_SCX;
 1091                                 CTR4(KTR_PTRACE,
 1092                     "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
 1093                                     p->p_pid, p->p_ptevents,
 1094                                     (u_long)(uintfptr_t)addr, data);
 1095                                 break;
 1096                         case PT_SYSCALL:
 1097                                 p->p_ptevents |= PTRACE_SYSCALL;
 1098                                 CTR4(KTR_PTRACE,
 1099                     "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
 1100                                     p->p_pid, p->p_ptevents,
 1101                                     (u_long)(uintfptr_t)addr, data);
 1102                                 break;
 1103                         case PT_CONTINUE:
 1104                                 CTR3(KTR_PTRACE,
 1105                                     "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
 1106                                     p->p_pid, (u_long)(uintfptr_t)addr, data);
 1107                                 break;
 1108                         }
 1109                         break;
 1110                 case PT_DETACH:
 1111                         /*
 1112                          * Reset the process parent.
 1113                          *
 1114                          * NB: This clears P_TRACED before reparenting
 1115                          * a detached process back to its original
 1116                          * parent.  Otherwise the debugee will be set
 1117                          * as an orphan of the debugger.
 1118                          */
 1119                         p->p_flag &= ~(P_TRACED | P_WAITED);
 1120                         if (p->p_oppid != p->p_pptr->p_pid) {
 1121                                 PROC_LOCK(p->p_pptr);
 1122                                 sigqueue_take(p->p_ksi);
 1123                                 PROC_UNLOCK(p->p_pptr);
 1124 
 1125                                 pp = proc_realparent(p);
 1126                                 proc_reparent(p, pp);
 1127                                 if (pp == initproc)
 1128                                         p->p_sigparent = SIGCHLD;
 1129                                 CTR3(KTR_PTRACE,
 1130                             "PT_DETACH: pid %d reparented to pid %d, sig %d",
 1131                                     p->p_pid, pp->p_pid, data);
 1132                         } else
 1133                                 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
 1134                                     p->p_pid, data);
 1135                         p->p_oppid = 0;
 1136                         p->p_ptevents = 0;
 1137                         FOREACH_THREAD_IN_PROC(p, td3) {
 1138                                 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
 1139                                         sigqueue_delete(&td3->td_sigqueue,
 1140                                             SIGSTOP);
 1141                                 }
 1142                                 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
 1143                                     TDB_SUSPEND);
 1144                         }
 1145 
 1146                         if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
 1147                                 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
 1148                                 p->p_flag2 &= ~P2_PTRACE_FSTP;
 1149                         }
 1150 
 1151                         /* should we send SIGCHLD? */
 1152                         /* childproc_continued(p); */
 1153                         break;
 1154                 }
 1155 
 1156                 sx_xunlock(&proctree_lock);
 1157                 proctree_locked = 0;
 1158 
 1159         sendsig:
 1160                 MPASS(proctree_locked == 0);
 1161                 
 1162                 /* 
 1163                  * Clear the pending event for the thread that just
 1164                  * reported its event (p_xthread).  This may not be
 1165                  * the thread passed to PT_CONTINUE, PT_STEP, etc. if
 1166                  * the debugger is resuming a different thread.
 1167                  *
 1168                  * Deliver any pending signal via the reporting thread.
 1169                  */
 1170                 MPASS(p->p_xthread != NULL);
 1171                 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
 1172                 p->p_xthread->td_xsig = data;
 1173                 p->p_xthread = NULL;
 1174                 p->p_xsig = data;
 1175 
 1176                 /*
 1177                  * P_WKILLED is insurance that a PT_KILL/SIGKILL
 1178                  * always works immediately, even if another thread is
 1179                  * unsuspended first and attempts to handle a
 1180                  * different signal or if the POSIX.1b style signal
 1181                  * queue cannot accommodate any new signals.
 1182                  */
 1183                 if (data == SIGKILL)
 1184                         proc_wkilled(p);
 1185 
 1186                 /*
 1187                  * Unsuspend all threads.  To leave a thread
 1188                  * suspended, use PT_SUSPEND to suspend it before
 1189                  * continuing the process.
 1190                  */
 1191                 PROC_SLOCK(p);
 1192                 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
 1193                 thread_unsuspend(p);
 1194                 PROC_SUNLOCK(p);
 1195                 break;
 1196 
 1197         case PT_WRITE_I:
 1198         case PT_WRITE_D:
 1199                 td2->td_dbgflags |= TDB_USERWR;
 1200                 PROC_UNLOCK(p);
 1201                 error = 0;
 1202                 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
 1203                     sizeof(int)) != sizeof(int))
 1204                         error = ENOMEM;
 1205                 else
 1206                         CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
 1207                             p->p_pid, addr, data);
 1208                 PROC_LOCK(p);
 1209                 break;
 1210 
 1211         case PT_READ_I:
 1212         case PT_READ_D:
 1213                 PROC_UNLOCK(p);
 1214                 error = tmp = 0;
 1215                 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
 1216                     sizeof(int)) != sizeof(int))
 1217                         error = ENOMEM;
 1218                 else
 1219                         CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
 1220                             p->p_pid, addr, tmp);
 1221                 td->td_retval[0] = tmp;
 1222                 PROC_LOCK(p);
 1223                 break;
 1224 
 1225         case PT_IO:
 1226 #ifdef COMPAT_FREEBSD32
 1227                 if (wrap32) {
 1228                         piod32 = addr;
 1229                         iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
 1230                         iov.iov_len = piod32->piod_len;
 1231                         uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
 1232                         uio.uio_resid = piod32->piod_len;
 1233                 } else
 1234 #endif
 1235                 {
 1236                         piod = addr;
 1237                         iov.iov_base = piod->piod_addr;
 1238                         iov.iov_len = piod->piod_len;
 1239                         uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
 1240                         uio.uio_resid = piod->piod_len;
 1241                 }
 1242                 uio.uio_iov = &iov;
 1243                 uio.uio_iovcnt = 1;
 1244                 uio.uio_segflg = UIO_USERSPACE;
 1245                 uio.uio_td = td;
 1246 #ifdef COMPAT_FREEBSD32
 1247                 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
 1248 #else
 1249                 tmp = piod->piod_op;
 1250 #endif
 1251                 switch (tmp) {
 1252                 case PIOD_READ_D:
 1253                 case PIOD_READ_I:
 1254                         CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
 1255                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1256                         uio.uio_rw = UIO_READ;
 1257                         break;
 1258                 case PIOD_WRITE_D:
 1259                 case PIOD_WRITE_I:
 1260                         CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
 1261                             p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
 1262                         td2->td_dbgflags |= TDB_USERWR;
 1263                         uio.uio_rw = UIO_WRITE;
 1264                         break;
 1265                 default:
 1266                         error = EINVAL;
 1267                         goto out;
 1268                 }
 1269                 PROC_UNLOCK(p);
 1270                 error = proc_rwmem(p, &uio);
 1271 #ifdef COMPAT_FREEBSD32
 1272                 if (wrap32)
 1273                         piod32->piod_len -= uio.uio_resid;
 1274                 else
 1275 #endif
 1276                         piod->piod_len -= uio.uio_resid;
 1277                 PROC_LOCK(p);
 1278                 break;
 1279 
 1280         case PT_KILL:
 1281                 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
 1282                 data = SIGKILL;
 1283                 goto sendsig;   /* in PT_CONTINUE above */
 1284 
 1285         case PT_SETREGS:
 1286                 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
 1287                     p->p_pid);
 1288                 td2->td_dbgflags |= TDB_USERWR;
 1289                 error = PROC_WRITE(regs, td2, addr);
 1290                 break;
 1291 
 1292         case PT_GETREGS:
 1293                 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
 1294                     p->p_pid);
 1295                 error = PROC_READ(regs, td2, addr);
 1296                 break;
 1297 
 1298         case PT_SETFPREGS:
 1299                 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
 1300                     p->p_pid);
 1301                 td2->td_dbgflags |= TDB_USERWR;
 1302                 error = PROC_WRITE(fpregs, td2, addr);
 1303                 break;
 1304 
 1305         case PT_GETFPREGS:
 1306                 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
 1307                     p->p_pid);
 1308                 error = PROC_READ(fpregs, td2, addr);
 1309                 break;
 1310 
 1311         case PT_SETDBREGS:
 1312                 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
 1313                     p->p_pid);
 1314                 td2->td_dbgflags |= TDB_USERWR;
 1315                 error = PROC_WRITE(dbregs, td2, addr);
 1316                 break;
 1317 
 1318         case PT_GETDBREGS:
 1319                 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
 1320                     p->p_pid);
 1321                 error = PROC_READ(dbregs, td2, addr);
 1322                 break;
 1323 
 1324         case PT_LWPINFO:
 1325                 if (data <= 0 ||
 1326 #ifdef COMPAT_FREEBSD32
 1327                     (!wrap32 && data > sizeof(*pl)) ||
 1328                     (wrap32 && data > sizeof(*pl32))) {
 1329 #else
 1330                     data > sizeof(*pl)) {
 1331 #endif
 1332                         error = EINVAL;
 1333                         break;
 1334                 }
 1335 #ifdef COMPAT_FREEBSD32
 1336                 if (wrap32) {
 1337                         pl = &plr;
 1338                         pl32 = addr;
 1339                 } else
 1340 #endif
 1341                 pl = addr;
 1342                 bzero(pl, sizeof(*pl));
 1343                 pl->pl_lwpid = td2->td_tid;
 1344                 pl->pl_event = PL_EVENT_NONE;
 1345                 pl->pl_flags = 0;
 1346                 if (td2->td_dbgflags & TDB_XSIG) {
 1347                         pl->pl_event = PL_EVENT_SIGNAL;
 1348                         if (td2->td_si.si_signo != 0 &&
 1349 #ifdef COMPAT_FREEBSD32
 1350                             ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
 1351                             pl_siginfo) + sizeof(pl->pl_siginfo)) ||
 1352                             (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
 1353                             pl_siginfo) + sizeof(struct siginfo32)))
 1354 #else
 1355                             data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
 1356                             + sizeof(pl->pl_siginfo)
 1357 #endif
 1358                         ){
 1359                                 pl->pl_flags |= PL_FLAG_SI;
 1360                                 pl->pl_siginfo = td2->td_si;
 1361                         }
 1362                 }
 1363                 if (td2->td_dbgflags & TDB_SCE)
 1364                         pl->pl_flags |= PL_FLAG_SCE;
 1365                 else if (td2->td_dbgflags & TDB_SCX)
 1366                         pl->pl_flags |= PL_FLAG_SCX;
 1367                 if (td2->td_dbgflags & TDB_EXEC)
 1368                         pl->pl_flags |= PL_FLAG_EXEC;
 1369                 if (td2->td_dbgflags & TDB_FORK) {
 1370                         pl->pl_flags |= PL_FLAG_FORKED;
 1371                         pl->pl_child_pid = td2->td_dbg_forked;
 1372                         if (td2->td_dbgflags & TDB_VFORK)
 1373                                 pl->pl_flags |= PL_FLAG_VFORKED;
 1374                 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
 1375                     TDB_VFORK)
 1376                         pl->pl_flags |= PL_FLAG_VFORK_DONE;
 1377                 if (td2->td_dbgflags & TDB_CHILD)
 1378                         pl->pl_flags |= PL_FLAG_CHILD;
 1379                 if (td2->td_dbgflags & TDB_BORN)
 1380                         pl->pl_flags |= PL_FLAG_BORN;
 1381                 if (td2->td_dbgflags & TDB_EXIT)
 1382                         pl->pl_flags |= PL_FLAG_EXITED;
 1383                 pl->pl_sigmask = td2->td_sigmask;
 1384                 pl->pl_siglist = td2->td_siglist;
 1385                 strcpy(pl->pl_tdname, td2->td_name);
 1386                 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
 1387                         pl->pl_syscall_code = td2->td_sa.code;
 1388                         pl->pl_syscall_narg = td2->td_sa.narg;
 1389                 } else {
 1390                         pl->pl_syscall_code = 0;
 1391                         pl->pl_syscall_narg = 0;
 1392                 }
 1393 #ifdef COMPAT_FREEBSD32
 1394                 if (wrap32)
 1395                         ptrace_lwpinfo_to32(pl, pl32);
 1396 #endif
 1397                 CTR6(KTR_PTRACE,
 1398     "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
 1399                     td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
 1400                     pl->pl_child_pid, pl->pl_syscall_code);
 1401                 break;
 1402 
 1403         case PT_GETNUMLWPS:
 1404                 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
 1405                     p->p_numthreads);
 1406                 td->td_retval[0] = p->p_numthreads;
 1407                 break;
 1408 
 1409         case PT_GETLWPLIST:
 1410                 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
 1411                     p->p_pid, data, p->p_numthreads);
 1412                 if (data <= 0) {
 1413                         error = EINVAL;
 1414                         break;
 1415                 }
 1416                 num = imin(p->p_numthreads, data);
 1417                 PROC_UNLOCK(p);
 1418                 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
 1419                 tmp = 0;
 1420                 PROC_LOCK(p);
 1421                 FOREACH_THREAD_IN_PROC(p, td2) {
 1422                         if (tmp >= num)
 1423                                 break;
 1424                         buf[tmp++] = td2->td_tid;
 1425                 }
 1426                 PROC_UNLOCK(p);
 1427                 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
 1428                 free(buf, M_TEMP);
 1429                 if (!error)
 1430                         td->td_retval[0] = tmp;
 1431                 PROC_LOCK(p);
 1432                 break;
 1433 
 1434         case PT_VM_TIMESTAMP:
 1435                 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
 1436                     p->p_pid, p->p_vmspace->vm_map.timestamp);
 1437                 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
 1438                 break;
 1439 
 1440         case PT_VM_ENTRY:
 1441                 PROC_UNLOCK(p);
 1442 #ifdef COMPAT_FREEBSD32
 1443                 if (wrap32)
 1444                         error = ptrace_vm_entry32(td, p, addr);
 1445                 else
 1446 #endif
 1447                 error = ptrace_vm_entry(td, p, addr);
 1448                 PROC_LOCK(p);
 1449                 break;
 1450 
 1451         default:
 1452 #ifdef __HAVE_PTRACE_MACHDEP
 1453                 if (req >= PT_FIRSTMACH) {
 1454                         PROC_UNLOCK(p);
 1455                         error = cpu_ptrace(td2, req, addr, data);
 1456                         PROC_LOCK(p);
 1457                 } else
 1458 #endif
 1459                         /* Unknown request. */
 1460                         error = EINVAL;
 1461                 break;
 1462         }
 1463 
 1464 out:
 1465         /* Drop our hold on this process now that the request has completed. */
 1466         _PRELE(p);
 1467 fail:
 1468         PROC_UNLOCK(p);
 1469         if (proctree_locked)
 1470                 sx_xunlock(&proctree_lock);
 1471         return (error);
 1472 }
 1473 #undef PROC_READ
 1474 #undef PROC_WRITE
 1475 
 1476 /*
 1477  * Stop a process because of a debugging event;
 1478  * stay stopped until p->p_step is cleared
 1479  * (cleared by PIOCCONT in procfs).
 1480  */
 1481 void
 1482 stopevent(struct proc *p, unsigned int event, unsigned int val)
 1483 {
 1484 
 1485         PROC_LOCK_ASSERT(p, MA_OWNED);
 1486         p->p_step = 1;
 1487         CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
 1488             val);
 1489         do {
 1490                 if (event != S_EXIT)
 1491                         p->p_xsig = val;
 1492                 p->p_xthread = NULL;
 1493                 p->p_stype = event;     /* Which event caused the stop? */
 1494                 wakeup(&p->p_stype);    /* Wake up any PIOCWAIT'ing procs */
 1495                 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
 1496         } while (p->p_step);
 1497 }

Cache object: 942b1af9668000089b3fd6552e4ec7ac


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