276 lines
8.9 KiB
C
276 lines
8.9 KiB
C
/* $NetBSD: procfs_map.c,v 1.28 2007/02/09 21:55:36 ad Exp $ */
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/*
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_status.c 8.3 (Berkeley) 2/17/94
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*
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* $FreeBSD: procfs_map.c,v 1.18 1998/12/04 22:54:51 archie Exp $
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*/
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/*
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* Copyright (c) 1993 Jan-Simon Pendry
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_status.c 8.3 (Berkeley) 2/17/94
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*
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* $FreeBSD: procfs_map.c,v 1.18 1998/12/04 22:54:51 archie Exp $
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: procfs_map.c,v 1.28 2007/02/09 21:55:36 ad Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <miscfs/procfs/procfs.h>
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#include <sys/lock.h>
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#include <uvm/uvm.h>
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#define MEBUFFERSIZE 256
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extern int getcwd_common(struct vnode *, struct vnode *,
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char **, char *, int, int, struct lwp *);
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static int procfs_vnode_to_path(struct vnode *vp, char *path, int len,
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struct lwp *curl, struct proc *p);
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/*
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* The map entries can *almost* be read with programs like cat. However,
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* large maps need special programs to read. It is not easy to implement
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* a program that can sense the required size of the buffer, and then
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* subsequently do a read with the appropriate size. This operation cannot
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* be atomic. The best that we can do is to allow the program to do a read
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* with an arbitrarily large buffer, and return as much as we can. We can
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* return an error code if the buffer is too small (EFBIG), then the program
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* can try a bigger buffer.
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*/
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int
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procfs_domap(struct lwp *curl, struct proc *p, struct pfsnode *pfs,
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struct uio *uio, int linuxmode)
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{
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size_t len;
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int error;
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struct vmspace *vm;
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struct vm_map *map;
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struct vm_map_entry *entry;
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char mebuffer[MEBUFFERSIZE];
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char *path;
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struct vnode *vp;
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struct vattr va;
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dev_t dev;
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long fileid;
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if (uio->uio_rw != UIO_READ)
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return (EOPNOTSUPP);
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if (uio->uio_offset != 0)
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return (0);
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error = 0;
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path = NULL;
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if (linuxmode != 0) {
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path = (char *)malloc(MAXPATHLEN * 4, M_TEMP, M_WAITOK);
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if (path == NULL)
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return ENOMEM;
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}
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if ((error = proc_vmspace_getref(p, &vm)) != 0) {
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if (path != NULL)
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free(path, M_TEMP);
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return (error);
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}
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map = &vm->vm_map;
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vm_map_lock_read(map);
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for (entry = map->header.next;
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((uio->uio_resid > 0) && (entry != &map->header));
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entry = entry->next) {
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if (UVM_ET_ISSUBMAP(entry))
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continue;
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if (linuxmode != 0) {
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*path = 0;
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dev = (dev_t)0;
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fileid = 0;
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if (UVM_ET_ISOBJ(entry) &&
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UVM_OBJ_IS_VNODE(entry->object.uvm_obj)) {
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vp = (struct vnode *)entry->object.uvm_obj;
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error = VOP_GETATTR(vp, &va, curl->l_cred,
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curl);
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if (error == 0 && vp != pfs->pfs_vnode) {
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fileid = va.va_fileid;
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dev = va.va_fsid;
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error = procfs_vnode_to_path(vp, path,
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MAXPATHLEN * 4, curl, p);
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}
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}
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snprintf(mebuffer, sizeof(mebuffer),
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"%0*lx-%0*lx %c%c%c%c %0*lx %02x:%02x %ld %s\n",
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(int)sizeof(void *) * 2,(unsigned long)entry->start,
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(int)sizeof(void *) * 2,(unsigned long)entry->end,
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(entry->protection & VM_PROT_READ) ? 'r' : '-',
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(entry->protection & VM_PROT_WRITE) ? 'w' : '-',
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(entry->protection & VM_PROT_EXECUTE) ? 'x' : '-',
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(entry->etype & UVM_ET_COPYONWRITE) ? 'p' : 's',
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(int)sizeof(void *) * 2,
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(unsigned long)entry->offset,
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major(dev), minor(dev), fileid, path);
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} else {
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snprintf(mebuffer, sizeof(mebuffer),
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"0x%lx 0x%lx %c%c%c %c%c%c %s %s %d %d %d\n",
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entry->start, entry->end,
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(entry->protection & VM_PROT_READ) ? 'r' : '-',
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(entry->protection & VM_PROT_WRITE) ? 'w' : '-',
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(entry->protection & VM_PROT_EXECUTE) ? 'x' : '-',
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(entry->max_protection & VM_PROT_READ) ? 'r' : '-',
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(entry->max_protection & VM_PROT_WRITE) ? 'w' : '-',
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(entry->max_protection & VM_PROT_EXECUTE) ?
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'x' : '-',
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(entry->etype & UVM_ET_COPYONWRITE) ?
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"COW" : "NCOW",
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(entry->etype & UVM_ET_NEEDSCOPY) ? "NC" : "NNC",
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entry->inheritance, entry->wired_count,
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entry->advice);
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}
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len = strlen(mebuffer);
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if (len > uio->uio_resid) {
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error = EFBIG;
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break;
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}
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error = uiomove(mebuffer, len, uio);
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if (error)
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break;
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}
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vm_map_unlock_read(map);
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uvmspace_free(vm);
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if (path != NULL)
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free(path, M_TEMP);
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return error;
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}
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int
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procfs_validmap(struct lwp *l, struct mount *mp)
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{
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return ((l->l_flag & L_SYSTEM) == 0);
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}
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/*
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* Try to find a pathname for a vnode. Since there is no mapping
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* vnode -> parent directory, this needs the NAMECACHE_ENTER_REVERSE
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* option to work (to make cache_revlookup succeed).
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*/
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static int procfs_vnode_to_path(struct vnode *vp, char *path, int len,
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struct lwp *curl, struct proc *p)
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{
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struct proc *curp = curl->l_proc;
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int error, lenused, elen;
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char *bp, *bend;
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struct vnode *dvp;
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bp = bend = &path[len];
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*(--bp) = '\0';
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error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
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if (error != 0)
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return error;
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error = cache_revlookup(vp, &dvp, &bp, path);
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vput(vp);
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if (error != 0)
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return (error == -1 ? ENOENT : error);
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error = vget(dvp, 0);
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if (error != 0)
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return error;
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*(--bp) = '/';
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/* XXX GETCWD_CHECK_ACCESS == 0x0001 */
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error = getcwd_common(dvp, NULL, &bp, path, len / 2, 1, curl);
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/*
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* Strip off emulation path for emulated processes looking at
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* the maps file of a process of the same emulation. (Won't
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* work if /emul/xxx is a symlink..)
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*/
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if (curp->p_emul == p->p_emul && curp->p_emul->e_path != NULL) {
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elen = strlen(curp->p_emul->e_path);
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if (!strncmp(bp, curp->p_emul->e_path, elen))
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bp = &bp[elen];
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}
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lenused = bend - bp;
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memcpy(path, bp, lenused);
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path[lenused] = 0;
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return 0;
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}
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