ddf9d24349
In the existing code we didn't really enforce that callers hold Giant before calling userland_sysctl(), even though there is no guarantee it is safe. Fix this by just placing Giant locks around the call to the oid handler. This also means we only pick up Giant for a very short period of time. Maybe we should add MPSAFE flags to sysctl or phase it out all together. I've also added SYSCTL_LOCK_ASSERT(). We have to make sure sysctl_root() and name2oid() are called with the sysctl lock held. Reviewed by: Jille Timmermans <jille quis cx>
265 lines
6.1 KiB
C
265 lines
6.1 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 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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* @(#)kern_xxx.c 8.2 (Berkeley) 11/14/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include <sys/utsname.h>
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#include <sys/vimage.h>
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#if defined(COMPAT_43)
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#ifndef _SYS_SYSPROTO_H_
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struct gethostname_args {
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char *hostname;
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u_int len;
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};
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#endif
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/* ARGSUSED */
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int
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ogethostname(td, uap)
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struct thread *td;
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struct gethostname_args *uap;
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{
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int name[2];
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size_t len = uap->len;
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name[0] = CTL_KERN;
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name[1] = KERN_HOSTNAME;
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return (userland_sysctl(td, name, 2, uap->hostname, &len,
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1, 0, 0, 0, 0));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct sethostname_args {
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char *hostname;
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u_int len;
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};
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#endif
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/* ARGSUSED */
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int
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osethostname(td, uap)
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struct thread *td;
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register struct sethostname_args *uap;
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{
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int name[2];
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int error;
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name[0] = CTL_KERN;
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name[1] = KERN_HOSTNAME;
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return (userland_sysctl(td, name, 2, 0, 0, 0, uap->hostname,
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uap->len, 0, 0));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct ogethostid_args {
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int dummy;
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};
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#endif
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/* ARGSUSED */
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int
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ogethostid(td, uap)
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struct thread *td;
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struct ogethostid_args *uap;
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{
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*(long *)(td->td_retval) = hostid;
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return (0);
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}
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#endif /* COMPAT_43 */
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#ifdef COMPAT_43
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#ifndef _SYS_SYSPROTO_H_
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struct osethostid_args {
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long hostid;
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};
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#endif
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/* ARGSUSED */
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int
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osethostid(td, uap)
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struct thread *td;
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struct osethostid_args *uap;
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{
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int error;
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error = priv_check(td, PRIV_SETHOSTID);
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if (error)
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return (error);
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mtx_lock(&Giant);
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hostid = uap->hostid;
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mtx_unlock(&Giant);
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return (0);
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}
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int
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oquota(td, uap)
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struct thread *td;
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struct oquota_args *uap;
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{
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return (ENOSYS);
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}
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#endif /* COMPAT_43 */
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#ifdef COMPAT_FREEBSD4
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/*
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* This is the FreeBSD-1.1 compatible uname(2) interface. These days it is
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* done in libc as a wrapper around a bunch of sysctl's. This must maintain
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* the old 1.1 binary ABI.
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*/
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#if SYS_NMLN != 32
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#error "FreeBSD-1.1 uname syscall has been broken"
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#endif
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#ifndef _SYS_SYSPROTO_H_
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struct uname_args {
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struct utsname *name;
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};
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#endif
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/* ARGSUSED */
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int
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freebsd4_uname(struct thread *td, struct freebsd4_uname_args *uap)
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{
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int name[2], error;
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size_t len;
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char *s, *us;
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name[0] = CTL_KERN;
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name[1] = KERN_OSTYPE;
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len = sizeof (uap->name->sysname);
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error = userland_sysctl(td, name, 2, uap->name->sysname, &len,
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1, 0, 0, 0, 0);
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if (error)
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return (error);
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subyte( uap->name->sysname + sizeof(uap->name->sysname) - 1, 0);
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name[1] = KERN_HOSTNAME;
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len = sizeof uap->name->nodename;
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error = userland_sysctl(td, name, 2, uap->name->nodename, &len,
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1, 0, 0, 0, 0);
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if (error)
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return (error);
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subyte( uap->name->nodename + sizeof(uap->name->nodename) - 1, 0);
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name[1] = KERN_OSRELEASE;
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len = sizeof uap->name->release;
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error = userland_sysctl(td, name, 2, uap->name->release, &len,
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1, 0, 0, 0, 0);
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if (error)
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return (error);
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subyte( uap->name->release + sizeof(uap->name->release) - 1, 0);
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/*
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name = KERN_VERSION;
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len = sizeof uap->name->version;
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error = userland_sysctl(td, name, 2, uap->name->version, &len,
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1, 0, 0, 0, 0);
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if (error)
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return (error);
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subyte( uap->name->version + sizeof(uap->name->version) - 1, 0);
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*/
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/*
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* this stupid hackery to make the version field look like FreeBSD 1.1
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*/
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for(s = version; *s && *s != '#'; s++);
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for(us = uap->name->version; *s && *s != ':'; s++) {
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error = subyte( us++, *s);
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if (error)
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return (error);
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}
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error = subyte( us++, 0);
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if (error)
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return (error);
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name[0] = CTL_HW;
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name[1] = HW_MACHINE;
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len = sizeof uap->name->machine;
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error = userland_sysctl(td, name, 2, uap->name->machine, &len,
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1, 0, 0, 0, 0);
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if (error)
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return (error);
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subyte( uap->name->machine + sizeof(uap->name->machine) - 1, 0);
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return (0);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct getdomainname_args {
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char *domainname;
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int len;
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};
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#endif
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/* ARGSUSED */
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int
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freebsd4_getdomainname(struct thread *td,
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struct freebsd4_getdomainname_args *uap)
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{
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int name[2];
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size_t len = uap->len;
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name[0] = CTL_KERN;
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name[1] = KERN_NISDOMAINNAME;
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return (userland_sysctl(td, name, 2, uap->domainname, &len,
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1, 0, 0, 0, 0));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct setdomainname_args {
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char *domainname;
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int len;
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};
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#endif
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/* ARGSUSED */
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int
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freebsd4_setdomainname(struct thread *td,
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struct freebsd4_setdomainname_args *uap)
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{
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int name[2];
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name[0] = CTL_KERN;
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name[1] = KERN_NISDOMAINNAME;
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return (userland_sysctl(td, name, 2, 0, 0, 0, uap->domainname,
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uap->len, 0, 0));
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}
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#endif /* COMPAT_FREEBSD4 */
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