2005-01-06 18:10:42 +00:00
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/*-
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1994-05-24 10:09:53 +00:00
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993 Sean Eric Fagan
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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 and Sean Eric Fagan.
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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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2017-02-28 23:42:47 +00:00
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* 3. Neither the name of the University nor the names of its contributors
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1994-05-24 10:09:53 +00:00
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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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1997-02-10 02:22:35 +00:00
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* @(#)procfs_mem.c 8.5 (Berkeley) 6/15/94
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1994-05-24 10:09:53 +00:00
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*
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1999-08-28 01:08:13 +00:00
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* $FreeBSD$
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1994-05-24 10:09:53 +00:00
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*/
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#include <sys/param.h>
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2001-05-01 08:13:21 +00:00
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#include <sys/lock.h>
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2001-05-19 01:28:09 +00:00
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#include <sys/mutex.h>
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1994-05-24 10:09:53 +00:00
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#include <sys/proc.h>
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2001-05-01 08:13:21 +00:00
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#include <sys/ptrace.h>
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2002-04-21 15:35:54 +00:00
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#include <sys/systm.h>
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2001-12-04 01:35:06 +00:00
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#include <sys/uio.h>
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2001-05-01 08:13:21 +00:00
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2001-12-04 01:35:06 +00:00
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#include <fs/pseudofs/pseudofs.h>
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2001-05-23 09:42:29 +00:00
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#include <fs/procfs/procfs.h>
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2001-05-01 08:13:21 +00:00
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1994-05-24 10:09:53 +00:00
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/*
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* Copy data in and out of the target process.
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* We do this by mapping the process's page into
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* the kernel and then doing a uiomove direct
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* from the kernel address space.
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*/
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int
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2001-12-04 01:35:06 +00:00
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procfs_doprocmem(PFS_FILL_ARGS)
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1994-05-24 10:09:53 +00:00
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{
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Prior to support for almost all ps activity via sysctl, ps used procfs,
and so special-casing was introduced to provide extra procfs privilege
to the kmem group. With the advent of non-setgid kmem ps, this code
is no longer required, and in fact, can is potentially harmful as it
allocates privilege to a gid that is increasingly less meaningful.
Knowledge of specific gid's in kernel is also generally bad precedent,
as the kernel security policy doesn't distinguish gid's specifically,
only uid 0.
This commit removes reference to kmem in procfs, both in terms of
access control decisions, and the applying of gid kmem to the
/proc/*/mem file, simplifying the associated code considerably.
Processes are still permitted to access the mem file based on
the debugging policy, so ps -e still works fine for normal
processes and use.
Reviewed by: tmm
Obtained from: TrustedBSD Project
2001-08-03 17:13:23 +00:00
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int error;
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1994-05-24 10:09:53 +00:00
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if (uio->uio_resid == 0)
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return (0);
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2002-04-13 23:15:28 +00:00
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PROC_LOCK(p);
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2002-05-19 00:14:50 +00:00
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error = p_candebug(td, p);
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2002-04-13 23:15:28 +00:00
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PROC_UNLOCK(p);
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if (error == 0)
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error = proc_rwmem(p, uio);
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1997-08-12 04:34:30 +00:00
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2001-12-04 01:35:06 +00:00
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return (error);
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1994-05-24 10:09:53 +00:00
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}
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