410d857972
which existed to cleanup the linux_osname mutex. Now that MTX_SYSINIT() has grown a SYSUNINIT to destroy mutexes on unload, the extra destroy here was redundant and resulted in panics in debug kernels. MFC after: 1 week Reported by: Goran Gajic ggajic at afrodita dot rcub dot bg dot ac dot yu
356 lines
8.6 KiB
C
356 lines
8.6 KiB
C
/*-
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* Copyright (c) 1999 Marcel Moolenaar
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* 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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* in this position and unchanged.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/jail.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include "opt_compat.h"
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#ifdef COMPAT_LINUX32
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#include <machine/../linux32/linux.h>
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#else
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#include <machine/../linux/linux.h>
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#endif
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#include <compat/linux/linux_mib.h>
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struct linux_prison {
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char pr_osname[LINUX_MAX_UTSNAME];
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char pr_osrelease[LINUX_MAX_UTSNAME];
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int pr_oss_version;
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};
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SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
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"Linux mode");
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static struct mtx osname_lock;
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MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
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static char linux_osname[LINUX_MAX_UTSNAME] = "Linux";
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static int
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linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
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{
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char osname[LINUX_MAX_UTSNAME];
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int error;
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linux_get_osname(req->td, osname);
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error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
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if (error || req->newptr == NULL)
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return (error);
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error = linux_set_osname(req->td, osname);
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return (error);
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}
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SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
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CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
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0, 0, linux_sysctl_osname, "A",
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"Linux kernel OS name");
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static char linux_osrelease[LINUX_MAX_UTSNAME] = "2.4.2";
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static int
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linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
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{
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char osrelease[LINUX_MAX_UTSNAME];
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int error;
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linux_get_osrelease(req->td, osrelease);
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error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
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if (error || req->newptr == NULL)
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return (error);
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error = linux_set_osrelease(req->td, osrelease);
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return (error);
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}
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SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
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CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
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0, 0, linux_sysctl_osrelease, "A",
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"Linux kernel OS release");
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static int linux_oss_version = 0x030600;
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static int
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linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
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{
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int oss_version;
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int error;
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oss_version = linux_get_oss_version(req->td);
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error = sysctl_handle_int(oidp, &oss_version, 0, req);
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if (error || req->newptr == NULL)
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return (error);
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error = linux_set_oss_version(req->td, oss_version);
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return (error);
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}
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SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
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0, 0, linux_sysctl_oss_version, "I",
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"Linux OSS version");
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/*
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* Returns holding the prison mutex if return non-NULL.
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*/
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static struct prison *
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linux_get_prison(struct thread *td)
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{
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register struct prison *pr;
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register struct linux_prison *lpr;
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KASSERT(td == curthread, ("linux_get_prison() called on !curthread"));
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if (!jailed(td->td_ucred))
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return (NULL);
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pr = td->td_ucred->cr_prison;
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mtx_lock(&pr->pr_mtx);
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if (pr->pr_linux == NULL) {
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/*
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* If we don't have a linux prison structure yet, allocate
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* one. We have to handle the race where another thread
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* could be adding a linux prison to this process already.
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*/
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mtx_unlock(&pr->pr_mtx);
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lpr = malloc(sizeof(struct linux_prison), M_PRISON,
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M_WAITOK | M_ZERO);
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mtx_lock(&pr->pr_mtx);
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if (pr->pr_linux == NULL)
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pr->pr_linux = lpr;
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else
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free(lpr, M_PRISON);
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}
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return (pr);
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}
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void
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linux_get_osname(struct thread *td, char *dst)
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{
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register struct prison *pr;
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register struct linux_prison *lpr;
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pr = td->td_ucred->cr_prison;
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if (pr != NULL) {
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mtx_lock(&pr->pr_mtx);
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if (pr->pr_linux != NULL) {
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lpr = (struct linux_prison *)pr->pr_linux;
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if (lpr->pr_osname[0]) {
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bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
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mtx_unlock(&pr->pr_mtx);
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return;
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}
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}
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mtx_unlock(&pr->pr_mtx);
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}
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mtx_lock(&osname_lock);
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bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
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mtx_unlock(&osname_lock);
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}
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int
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linux_set_osname(struct thread *td, char *osname)
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{
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struct prison *pr;
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struct linux_prison *lpr;
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pr = linux_get_prison(td);
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if (pr != NULL) {
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lpr = (struct linux_prison *)pr->pr_linux;
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strcpy(lpr->pr_osname, osname);
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mtx_unlock(&pr->pr_mtx);
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} else {
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mtx_lock(&osname_lock);
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strcpy(linux_osname, osname);
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mtx_unlock(&osname_lock);
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}
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return (0);
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}
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void
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linux_get_osrelease(struct thread *td, char *dst)
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{
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register struct prison *pr;
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struct linux_prison *lpr;
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pr = td->td_ucred->cr_prison;
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if (pr != NULL) {
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mtx_lock(&pr->pr_mtx);
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if (pr->pr_linux != NULL) {
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lpr = (struct linux_prison *)pr->pr_linux;
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if (lpr->pr_osrelease[0]) {
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bcopy(lpr->pr_osrelease, dst,
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LINUX_MAX_UTSNAME);
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mtx_unlock(&pr->pr_mtx);
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return;
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}
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}
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mtx_unlock(&pr->pr_mtx);
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}
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mtx_lock(&osname_lock);
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bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
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mtx_unlock(&osname_lock);
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}
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int
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linux_set_osrelease(struct thread *td, char *osrelease)
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{
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struct prison *pr;
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struct linux_prison *lpr;
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pr = linux_get_prison(td);
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if (pr != NULL) {
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lpr = (struct linux_prison *)pr->pr_linux;
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strcpy(lpr->pr_osrelease, osrelease);
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mtx_unlock(&pr->pr_mtx);
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} else {
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mtx_lock(&osname_lock);
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strcpy(linux_osrelease, osrelease);
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mtx_unlock(&osname_lock);
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}
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return (0);
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}
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int
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linux_get_oss_version(struct thread *td)
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{
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register struct prison *pr;
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register struct linux_prison *lpr;
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int version;
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pr = td->td_ucred->cr_prison;
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if (pr != NULL) {
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mtx_lock(&pr->pr_mtx);
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if (pr->pr_linux != NULL) {
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lpr = (struct linux_prison *)pr->pr_linux;
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if (lpr->pr_oss_version) {
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version = lpr->pr_oss_version;
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mtx_unlock(&pr->pr_mtx);
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return (version);
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}
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}
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mtx_unlock(&pr->pr_mtx);
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}
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mtx_lock(&osname_lock);
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version = linux_oss_version;
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mtx_unlock(&osname_lock);
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return (version);
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}
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int
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linux_set_oss_version(struct thread *td, int oss_version)
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{
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struct prison *pr;
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struct linux_prison *lpr;
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pr = linux_get_prison(td);
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if (pr != NULL) {
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lpr = (struct linux_prison *)pr->pr_linux;
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lpr->pr_oss_version = oss_version;
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mtx_unlock(&pr->pr_mtx);
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} else {
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mtx_lock(&osname_lock);
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linux_oss_version = oss_version;
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mtx_unlock(&osname_lock);
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}
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return (0);
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}
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#ifdef DEBUG
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u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
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static int
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linux_debug(int syscall, int toggle, int global)
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{
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if (global) {
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char c = toggle ? 0 : 0xff;
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memset(linux_debug_map, c, sizeof(linux_debug_map));
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return (0);
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}
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if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
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return (EINVAL);
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if (toggle)
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clrbit(linux_debug_map, syscall);
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else
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setbit(linux_debug_map, syscall);
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return (0);
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}
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/*
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* Usage: sysctl linux.debug=<syscall_nr>.<0/1>
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*
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* E.g.: sysctl linux.debug=21.0
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*
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* As a special case, syscall "all" will apply to all syscalls globally.
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*/
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#define LINUX_MAX_DEBUGSTR 16
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static int
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linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
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{
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char value[LINUX_MAX_DEBUGSTR], *p;
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int error, sysc, toggle;
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int global = 0;
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value[0] = '\0';
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error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
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if (error || req->newptr == NULL)
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return (error);
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for (p = value; *p != '\0' && *p != '.'; p++);
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if (*p == '\0')
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return (EINVAL);
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*p++ = '\0';
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sysc = strtol(value, NULL, 0);
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toggle = strtol(p, NULL, 0);
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if (strcmp(value, "all") == 0)
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global = 1;
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error = linux_debug(sysc, toggle, global);
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return (error);
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}
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SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
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CTLTYPE_STRING | CTLFLAG_RW,
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0, 0, linux_sysctl_debug, "A",
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"Linux debugging control");
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#endif /* DEBUG */
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