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 1.14 2003/10/15 21:52:38 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 <vfs/procfs/procfs.h>
51 #include <sys/thread2.h>
53 /* use the equivalent procfs code */
56 pread (struct proc *procp, unsigned int addr, unsigned int *retval) {
61 int page_offset; /* offset into page */
62 vm_offset_t pageno; /* page number */
63 vm_map_entry_t out_entry;
68 /* Map page into kernel space */
70 map = &procp->p_vmspace->vm_map;
72 page_offset = addr - trunc_page(addr);
73 pageno = trunc_page(addr);
76 rv = vm_map_lookup (&tmap, pageno, VM_PROT_READ, &out_entry,
77 &object, &pindex, &out_prot, &wired);
79 if (rv != KERN_SUCCESS)
82 vm_map_lookup_done (tmap, out_entry, 0);
84 /* Find space in kernel_map for the page we're interested in */
85 rv = vm_map_find (kernel_map, object, IDX_TO_OFF(pindex),
86 &kva, PAGE_SIZE, 0, VM_PROT_ALL, VM_PROT_ALL, 0);
89 vm_object_reference (object);
91 rv = vm_map_wire (kernel_map, kva, kva + PAGE_SIZE, 0);
94 bcopy ((caddr_t)kva + page_offset,
95 retval, sizeof *retval);
97 vm_map_remove (kernel_map, kva, kva + PAGE_SIZE);
104 pwrite (struct proc *procp, unsigned int addr, unsigned int datum) {
109 int page_offset; /* offset into page */
110 vm_offset_t pageno; /* page number */
111 vm_map_entry_t out_entry;
115 boolean_t fix_prot = 0;
117 /* Map page into kernel space */
119 map = &procp->p_vmspace->vm_map;
121 page_offset = addr - trunc_page(addr);
122 pageno = trunc_page(addr);
125 * Check the permissions for the area we're interested in.
128 if (vm_map_check_protection (map, pageno, pageno + PAGE_SIZE,
129 VM_PROT_WRITE) == FALSE) {
131 * If the page was not writable, we make it so.
132 * XXX It is possible a page may *not* be read/executable,
133 * if a process changes that!
136 /* The page isn't writable, so let's try making it so... */
137 if ((rv = vm_map_protect (map, pageno, pageno + PAGE_SIZE,
138 VM_PROT_ALL, 0)) != KERN_SUCCESS)
139 return EFAULT; /* I guess... */
143 * Now we need to get the page. out_entry, out_prot, wired, and
144 * single_use aren't used. One would think the vm code would be
145 * a *bit* nicer... We use tmap because vm_map_lookup() can
146 * change the map argument.
150 rv = vm_map_lookup (&tmap, pageno, VM_PROT_WRITE, &out_entry,
151 &object, &pindex, &out_prot, &wired);
152 if (rv != KERN_SUCCESS) {
157 * Okay, we've got the page. Let's release tmap.
160 vm_map_lookup_done (tmap, out_entry, 0);
163 * Fault the page in...
166 rv = vm_fault(map, pageno, VM_PROT_WRITE|VM_PROT_READ, FALSE);
167 if (rv != KERN_SUCCESS)
170 /* Find space in kernel_map for the page we're interested in */
171 rv = vm_map_find (kernel_map, object, IDX_TO_OFF(pindex),
173 VM_PROT_ALL, VM_PROT_ALL, 0);
175 vm_object_reference (object);
177 rv = vm_map_wire (kernel_map, kva, kva + PAGE_SIZE, 0);
179 bcopy (&datum, (caddr_t)kva + page_offset, sizeof datum);
181 vm_map_remove (kernel_map, kva, kva + PAGE_SIZE);
185 vm_map_protect (map, pageno, pageno + PAGE_SIZE,
186 VM_PROT_READ|VM_PROT_EXECUTE, 0);
192 * Process debugging system call.
195 ptrace(struct ptrace_args *uap)
197 struct proc *p = curproc;
200 * XXX this obfuscation is to reduce stack usage, but the register
201 * structs may be too large to put on the stack anyway.
204 struct ptrace_io_desc piod;
221 error = copyin(uap->addr, &r.reg, sizeof r.reg);
224 error = copyin(uap->addr, &r.fpreg, sizeof r.fpreg);
228 error = copyin(uap->addr, &r.dbreg, sizeof r.dbreg);
232 error = copyin(uap->addr, &r.piod, sizeof r.piod);
240 error = kern_ptrace(p, uap->req, uap->pid, addr, uap->data,
241 &uap->sysmsg_result);
247 (void)copyout(&r.piod, uap->addr, sizeof r.piod);
250 error = copyout(&r.reg, uap->addr, sizeof r.reg);
253 error = copyout(&r.fpreg, uap->addr, sizeof r.fpreg);
257 error = copyout(&r.dbreg, uap->addr, sizeof r.dbreg);
266 kern_ptrace(struct proc *curp, int req, pid_t pid, void *addr, int data, int *res)
271 struct ptrace_io_desc *piod;
276 if (req == PT_TRACE_ME) {
279 if ((p = pfind(pid)) == NULL)
282 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred))
285 /* Can't trace a process that's currently exec'ing. */
286 if ((p->p_flag & P_INEXEC) != 0)
299 if (p->p_pid == curp->p_pid)
303 if (p->p_flag & P_TRACED)
306 if (curp->p_flag & P_TRACED)
307 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr)
311 /* not owned by you, has done setuid (unless you're root) */
312 if ((p->p_ucred->cr_ruid != curp->p_ucred->cr_ruid) ||
313 (p->p_flag & P_SUGID)) {
314 if ((error = suser(curp->p_thread)) != 0)
318 /* can't trace init when securelevel > 0 */
319 if (securelevel > 0 && p->p_pid == 1)
352 /* not being traced... */
353 if ((p->p_flag & P_TRACED) == 0)
356 /* not being traced by YOU */
357 if (p->p_pptr != curp)
360 /* not currently stopped */
361 if (p->p_stat != SSTOP || (p->p_flag & P_WAITED) == 0)
373 * Single step fixup ala procfs
379 * Actually do the requests
386 /* set my trace flag and "owner" so it can read/write me */
387 p->p_flag |= P_TRACED;
388 p->p_oppid = p->p_pptr->p_pid;
392 /* security check done above */
393 p->p_flag |= P_TRACED;
394 p->p_oppid = p->p_pptr->p_pid;
395 if (p->p_pptr != curp)
396 proc_reparent(p, curp);
398 goto sendsig; /* in PT_CONTINUE below */
403 /* Zero means do not send any signal */
404 if (data < 0 || data > _SIG_MAXSIG)
409 if (req == PT_STEP) {
410 if ((error = ptrace_single_step (p))) {
416 if (addr != (void *)1) {
417 if ((error = ptrace_set_pc (p,
418 (u_long)(uintfptr_t)addr))) {
425 if (req == PT_DETACH) {
426 /* reset process parent */
427 if (p->p_oppid != p->p_pptr->p_pid) {
430 pp = pfind(p->p_oppid);
431 proc_reparent(p, pp ? pp : initproc);
434 p->p_flag &= ~(P_TRACED | P_WAITED);
437 /* should we send SIGCHLD? */
441 /* deliver or queue signal */
443 if (p->p_stat == SSTOP) {
459 * NOTE! uio_offset represents the offset in the target
460 * process. The iov is in the current process (the guy
461 * making the ptrace call) so uio_td must be the current
462 * process (though for a SYSSPACE transfer it doesn't
466 /* write = 0 set above */
467 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
468 iov.iov_len = sizeof(int);
471 uio.uio_offset = (off_t)(uintptr_t)addr;
472 uio.uio_resid = sizeof(int);
473 uio.uio_segflg = UIO_SYSSPACE;
474 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
475 uio.uio_td = curp->p_thread;
476 error = procfs_domem(curp, p, NULL, &uio);
477 if (uio.uio_resid != 0) {
479 * XXX procfs_domem() doesn't currently return ENOSPC,
480 * so I think write() can bogusly return 0.
481 * XXX what happens for short writes? We don't want
482 * to write partial data.
483 * XXX procfs_domem() returns EPERM for other invalid
484 * addresses. Convert this to EINVAL. Does this
485 * clobber returns of EPERM for other reasons?
487 if (error == 0 || error == ENOSPC || error == EPERM)
488 error = EINVAL; /* EOF */
496 * NOTE! uio_offset represents the offset in the target
497 * process. The iov is in the current process (the guy
498 * making the ptrace call) so uio_td must be the current
502 iov.iov_base = piod->piod_addr;
503 iov.iov_len = piod->piod_len;
506 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
507 uio.uio_resid = piod->piod_len;
508 uio.uio_segflg = UIO_USERSPACE;
509 uio.uio_td = curp->p_thread;
510 switch (piod->piod_op) {
513 uio.uio_rw = UIO_READ;
517 uio.uio_rw = UIO_WRITE;
522 error = procfs_domem(curp, p, NULL, &uio);
523 piod->piod_len -= uio.uio_resid;
528 goto sendsig; /* in PT_CONTINUE above */
534 #endif /* PT_SETREGS */
537 /* write = 0 above */
538 #endif /* PT_SETREGS */
539 #if defined(PT_SETREGS) || defined(PT_GETREGS)
540 if (!procfs_validregs(p)) /* no P_SYSTEM procs please */
544 iov.iov_len = sizeof(struct reg);
548 uio.uio_resid = sizeof(struct reg);
549 uio.uio_segflg = UIO_SYSSPACE;
550 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
551 uio.uio_td = curp->p_thread;
552 return (procfs_doregs(curp, p, NULL, &uio));
554 #endif /* defined(PT_SETREGS) || defined(PT_GETREGS) */
560 #endif /* PT_SETFPREGS */
563 /* write = 0 above */
564 #endif /* PT_SETFPREGS */
565 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
566 if (!procfs_validfpregs(p)) /* no P_SYSTEM procs please */
570 iov.iov_len = sizeof(struct fpreg);
574 uio.uio_resid = sizeof(struct fpreg);
575 uio.uio_segflg = UIO_SYSSPACE;
576 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
577 uio.uio_td = curp->p_thread;
578 return (procfs_dofpregs(curp, p, NULL, &uio));
580 #endif /* defined(PT_SETFPREGS) || defined(PT_GETFPREGS) */
586 #endif /* PT_SETDBREGS */
589 /* write = 0 above */
590 #endif /* PT_SETDBREGS */
591 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS)
592 if (!procfs_validdbregs(p)) /* no P_SYSTEM procs please */
596 iov.iov_len = sizeof(struct dbreg);
600 uio.uio_resid = sizeof(struct dbreg);
601 uio.uio_segflg = UIO_SYSSPACE;
602 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
603 uio.uio_td = curp->p_thread;
604 return (procfs_dodbregs(curp, p, NULL, &uio));
606 #endif /* defined(PT_SETDBREGS) || defined(PT_GETDBREGS) */
624 * Stop a process because of a procfs event;
625 * stay stopped until p->p_step is cleared
626 * (cleared by PIOCCONT in procfs).
630 stopevent(struct proc *p, unsigned int event, unsigned int val)
636 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
638 p->p_stype = event; /* Which event caused the stop? */
639 tsleep(&p->p_step, 0, "stopevent", 0);