2 * Copyright (c) 1994, Sean Eric Fagan
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
31 * $FreeBSD: src/sys/kern/sys_process.c,v 1.51.2.6 2003/01/08 03:06:45 kan Exp $
32 * $DragonFly: src/sys/kern/sys_process.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/sysproto.h>
39 #include <sys/vnode.h>
40 #include <sys/ptrace.h>
42 #include <machine/reg.h>
46 #include <vm/vm_map.h>
47 #include <vm/vm_page.h>
50 #include <miscfs/procfs/procfs.h>
52 /* use the equivalent procfs code */
55 pread (struct proc *procp, unsigned int addr, unsigned int *retval) {
60 int page_offset; /* offset into page */
61 vm_offset_t pageno; /* page number */
62 vm_map_entry_t out_entry;
67 /* Map page into kernel space */
69 map = &procp->p_vmspace->vm_map;
71 page_offset = addr - trunc_page(addr);
72 pageno = trunc_page(addr);
75 rv = vm_map_lookup (&tmap, pageno, VM_PROT_READ, &out_entry,
76 &object, &pindex, &out_prot, &wired);
78 if (rv != KERN_SUCCESS)
81 vm_map_lookup_done (tmap, out_entry);
83 /* Find space in kernel_map for the page we're interested in */
84 rv = vm_map_find (kernel_map, object, IDX_TO_OFF(pindex),
85 &kva, PAGE_SIZE, 0, VM_PROT_ALL, VM_PROT_ALL, 0);
88 vm_object_reference (object);
90 rv = vm_map_pageable (kernel_map, kva, kva + PAGE_SIZE, 0);
93 bcopy ((caddr_t)kva + page_offset,
94 retval, sizeof *retval);
96 vm_map_remove (kernel_map, kva, kva + PAGE_SIZE);
103 pwrite (struct proc *procp, unsigned int addr, unsigned int datum) {
108 int page_offset; /* offset into page */
109 vm_offset_t pageno; /* page number */
110 vm_map_entry_t out_entry;
114 boolean_t fix_prot = 0;
116 /* Map page into kernel space */
118 map = &procp->p_vmspace->vm_map;
120 page_offset = addr - trunc_page(addr);
121 pageno = trunc_page(addr);
124 * Check the permissions for the area we're interested in.
127 if (vm_map_check_protection (map, pageno, pageno + PAGE_SIZE,
128 VM_PROT_WRITE) == FALSE) {
130 * If the page was not writable, we make it so.
131 * XXX It is possible a page may *not* be read/executable,
132 * if a process changes that!
135 /* The page isn't writable, so let's try making it so... */
136 if ((rv = vm_map_protect (map, pageno, pageno + PAGE_SIZE,
137 VM_PROT_ALL, 0)) != KERN_SUCCESS)
138 return EFAULT; /* I guess... */
142 * Now we need to get the page. out_entry, out_prot, wired, and
143 * single_use aren't used. One would think the vm code would be
144 * a *bit* nicer... We use tmap because vm_map_lookup() can
145 * change the map argument.
149 rv = vm_map_lookup (&tmap, pageno, VM_PROT_WRITE, &out_entry,
150 &object, &pindex, &out_prot, &wired);
151 if (rv != KERN_SUCCESS) {
156 * Okay, we've got the page. Let's release tmap.
159 vm_map_lookup_done (tmap, out_entry);
162 * Fault the page in...
165 rv = vm_fault(map, pageno, VM_PROT_WRITE|VM_PROT_READ, FALSE);
166 if (rv != KERN_SUCCESS)
169 /* Find space in kernel_map for the page we're interested in */
170 rv = vm_map_find (kernel_map, object, IDX_TO_OFF(pindex),
172 VM_PROT_ALL, VM_PROT_ALL, 0);
174 vm_object_reference (object);
176 rv = vm_map_pageable (kernel_map, kva, kva + PAGE_SIZE, 0);
178 bcopy (&datum, (caddr_t)kva + page_offset, sizeof datum);
180 vm_map_remove (kernel_map, kva, kva + PAGE_SIZE);
184 vm_map_protect (map, pageno, pageno + PAGE_SIZE,
185 VM_PROT_READ|VM_PROT_EXECUTE, 0);
191 * Process debugging system call.
193 #ifndef _SYS_SYSPROTO_H_
203 ptrace(struct proc *p, struct ptrace_args *uap)
206 * XXX this obfuscation is to reduce stack usage, but the register
207 * structs may be too large to put on the stack anyway.
210 struct ptrace_io_desc piod;
227 error = copyin(uap->addr, &r.reg, sizeof r.reg);
230 error = copyin(uap->addr, &r.fpreg, sizeof r.fpreg);
234 error = copyin(uap->addr, &r.dbreg, sizeof r.dbreg);
238 error = copyin(uap->addr, &r.piod, sizeof r.piod);
246 error = kern_ptrace(p, uap->req, uap->pid, addr, uap->data);
252 (void)copyout(&r.piod, uap->addr, sizeof r.piod);
255 error = copyout(&r.reg, uap->addr, sizeof r.reg);
258 error = copyout(&r.fpreg, uap->addr, sizeof r.fpreg);
262 error = copyout(&r.dbreg, uap->addr, sizeof r.dbreg);
271 kern_ptrace(struct proc *curp, int req, pid_t pid, void *addr, int data)
276 struct ptrace_io_desc *piod;
281 if (req == PT_TRACE_ME)
284 if ((p = pfind(pid)) == NULL)
287 if (!PRISON_CHECK(curp, p))
290 /* Can't trace a process that's currently exec'ing. */
291 if ((p->p_flag & P_INEXEC) != 0)
304 if (p->p_pid == curp->p_pid)
308 if (p->p_flag & P_TRACED)
311 if (curp->p_flag & P_TRACED)
312 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr)
316 /* not owned by you, has done setuid (unless you're root) */
317 if ((p->p_cred->p_ruid != curp->p_cred->p_ruid) ||
318 (p->p_flag & P_SUGID)) {
319 if ((error = suser(curp)) != 0)
323 /* can't trace init when securelevel > 0 */
324 if (securelevel > 0 && p->p_pid == 1)
357 /* not being traced... */
358 if ((p->p_flag & P_TRACED) == 0)
361 /* not being traced by YOU */
362 if (p->p_pptr != curp)
365 /* not currently stopped */
366 if (p->p_stat != SSTOP || (p->p_flag & P_WAITED) == 0)
378 * Single step fixup ala procfs
384 * Actually do the requests
387 curp->p_retval[0] = 0;
391 /* set my trace flag and "owner" so it can read/write me */
392 p->p_flag |= P_TRACED;
393 p->p_oppid = p->p_pptr->p_pid;
397 /* security check done above */
398 p->p_flag |= P_TRACED;
399 p->p_oppid = p->p_pptr->p_pid;
400 if (p->p_pptr != curp)
401 proc_reparent(p, curp);
403 goto sendsig; /* in PT_CONTINUE below */
408 if ((req != PT_STEP) && ((unsigned)data > _SIG_MAXSIG))
413 if (req == PT_STEP) {
414 if ((error = ptrace_single_step (p))) {
420 if (addr != (void *)1) {
421 if ((error = ptrace_set_pc (p,
422 (u_long)(uintfptr_t)addr))) {
429 if (req == PT_DETACH) {
430 /* reset process parent */
431 if (p->p_oppid != p->p_pptr->p_pid) {
434 pp = pfind(p->p_oppid);
435 proc_reparent(p, pp ? pp : initproc);
438 p->p_flag &= ~(P_TRACED | P_WAITED);
441 /* should we send SIGCHLD? */
445 /* deliver or queue signal */
447 if (p->p_stat == SSTOP) {
463 /* write = 0 set above */
464 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
465 iov.iov_len = sizeof(int);
468 uio.uio_offset = (off_t)(uintptr_t)addr;
469 uio.uio_resid = sizeof(int);
470 uio.uio_segflg = UIO_SYSSPACE;
471 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
473 error = procfs_domem(curp, p, NULL, &uio);
474 if (uio.uio_resid != 0) {
476 * XXX procfs_domem() doesn't currently return ENOSPC,
477 * so I think write() can bogusly return 0.
478 * XXX what happens for short writes? We don't want
479 * to write partial data.
480 * XXX procfs_domem() returns EPERM for other invalid
481 * addresses. Convert this to EINVAL. Does this
482 * clobber returns of EPERM for other reasons?
484 if (error == 0 || error == ENOSPC || error == EPERM)
485 error = EINVAL; /* EOF */
488 curp->p_retval[0] = tmp;
493 iov.iov_base = piod->piod_addr;
494 iov.iov_len = piod->piod_len;
497 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
498 uio.uio_resid = piod->piod_len;
499 uio.uio_segflg = UIO_USERSPACE;
501 switch (piod->piod_op) {
504 uio.uio_rw = UIO_READ;
508 uio.uio_rw = UIO_WRITE;
513 error = procfs_domem(curp, p, NULL, &uio);
514 piod->piod_len -= uio.uio_resid;
519 goto sendsig; /* in PT_CONTINUE above */
525 #endif /* PT_SETREGS */
528 /* write = 0 above */
529 #endif /* PT_SETREGS */
530 #if defined(PT_SETREGS) || defined(PT_GETREGS)
531 if (!procfs_validregs(p)) /* no P_SYSTEM procs please */
535 iov.iov_len = sizeof(struct reg);
539 uio.uio_resid = sizeof(struct reg);
540 uio.uio_segflg = UIO_SYSSPACE;
541 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
542 uio.uio_procp = curp;
543 return (procfs_doregs(curp, p, NULL, &uio));
545 #endif /* defined(PT_SETREGS) || defined(PT_GETREGS) */
551 #endif /* PT_SETFPREGS */
554 /* write = 0 above */
555 #endif /* PT_SETFPREGS */
556 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
557 if (!procfs_validfpregs(p)) /* no P_SYSTEM procs please */
561 iov.iov_len = sizeof(struct fpreg);
565 uio.uio_resid = sizeof(struct fpreg);
566 uio.uio_segflg = UIO_SYSSPACE;
567 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
568 uio.uio_procp = curp;
569 return (procfs_dofpregs(curp, p, NULL, &uio));
571 #endif /* defined(PT_SETFPREGS) || defined(PT_GETFPREGS) */
577 #endif /* PT_SETDBREGS */
580 /* write = 0 above */
581 #endif /* PT_SETDBREGS */
582 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS)
583 if (!procfs_validdbregs(p)) /* no P_SYSTEM procs please */
587 iov.iov_len = sizeof(struct dbreg);
591 uio.uio_resid = sizeof(struct dbreg);
592 uio.uio_segflg = UIO_SYSSPACE;
593 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
594 uio.uio_procp = curp;
595 return (procfs_dodbregs(curp, p, NULL, &uio));
597 #endif /* defined(PT_SETDBREGS) || defined(PT_GETDBREGS) */
615 * Stop a process because of a procfs event;
616 * stay stopped until p->p_step is cleared
617 * (cleared by PIOCCONT in procfs).
621 stopevent(struct proc *p, unsigned int event, unsigned int val) {
626 p->p_stype = event; /* Which event caused the stop? */
627 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
628 tsleep(&p->p_step, PWAIT, "stopevent", 0);