7cbf72137f
restrictions) were found to be inadequately described by a boolean. Define a new parameter type with three values (disable, new, inherit) to handle these and future cases. Approved by: re (kib), bz (mentor) Discussed with: rwatson
608 lines
15 KiB
C
608 lines
15 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/mount.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 <sys/sx.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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int pr_osrel;
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};
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static struct linux_prison lprison0 = {
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.pr_osname = "Linux",
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.pr_osrelease = "2.6.16",
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.pr_oss_version = 0x030600,
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.pr_osrel = 2006016
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};
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static unsigned linux_osd_jail_slot;
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SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
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"Linux mode");
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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 | CTLFLAG_MPSAFE,
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0, 0, linux_sysctl_osname, "A",
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"Linux kernel OS name");
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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 | CTLFLAG_MPSAFE,
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0, 0, linux_sysctl_osrelease, "A",
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"Linux kernel OS release");
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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 | CTLFLAG_MPSAFE,
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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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* Map the osrelease into integer
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*/
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static int
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linux_map_osrel(char *osrelease, int *osrel)
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{
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char *sep, *eosrelease;
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int len, v0, v1, v2, v;
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len = strlen(osrelease);
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eosrelease = osrelease + len;
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v0 = strtol(osrelease, &sep, 10);
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if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
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return (EINVAL);
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osrelease = sep + 1;
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v1 = strtol(osrelease, &sep, 10);
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if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
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return (EINVAL);
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osrelease = sep + 1;
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v2 = strtol(osrelease, &sep, 10);
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if (osrelease == sep || sep != eosrelease)
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return (EINVAL);
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v = v0 * 1000000 + v1 * 1000 + v2;
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if (v < 1000000)
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return (EINVAL);
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*osrel = v;
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return (0);
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}
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/*
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* Find a prison with Linux info.
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* Return the Linux info and the (locked) prison.
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*/
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static struct linux_prison *
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linux_find_prison(struct prison *spr, struct prison **prp)
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{
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struct prison *pr;
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struct linux_prison *lpr;
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if (!linux_osd_jail_slot)
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/* In case osd_register failed. */
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spr = &prison0;
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for (pr = spr;; pr = pr->pr_parent) {
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mtx_lock(&pr->pr_mtx);
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lpr = (pr == &prison0)
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? &lprison0
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: osd_jail_get(pr, linux_osd_jail_slot);
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if (lpr != NULL)
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break;
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mtx_unlock(&pr->pr_mtx);
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}
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*prp = pr;
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return (lpr);
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}
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/*
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* Ensure a prison has its own Linux info. If lprp is non-null, point it to
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* the Linux info and lock the prison.
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*/
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static int
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linux_alloc_prison(struct prison *pr, struct linux_prison **lprp)
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{
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struct prison *ppr;
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struct linux_prison *lpr, *nlpr;
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int error;
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/* If this prison already has Linux info, return that. */
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error = 0;
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lpr = linux_find_prison(pr, &ppr);
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if (ppr == pr)
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goto done;
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/*
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* Allocate a new info record. Then check again, in case something
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* changed during the allocation.
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*/
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mtx_unlock(&ppr->pr_mtx);
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nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK);
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lpr = linux_find_prison(pr, &ppr);
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if (ppr == pr) {
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free(nlpr, M_PRISON);
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goto done;
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}
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/* Inherit the initial values from the ancestor. */
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mtx_lock(&pr->pr_mtx);
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error = osd_jail_set(pr, linux_osd_jail_slot, nlpr);
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if (error == 0) {
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bcopy(lpr, nlpr, sizeof(*lpr));
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lpr = nlpr;
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} else {
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free(nlpr, M_PRISON);
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lpr = NULL;
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}
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mtx_unlock(&ppr->pr_mtx);
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done:
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if (lprp != NULL)
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*lprp = lpr;
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else
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mtx_unlock(&pr->pr_mtx);
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return (error);
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}
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/*
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* Jail OSD methods for Linux prison data.
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*/
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static int
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linux_prison_create(void *obj, void *data)
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{
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struct prison *pr = obj;
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struct vfsoptlist *opts = data;
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int jsys;
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if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 &&
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jsys == JAIL_SYS_INHERIT)
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return (0);
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/*
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* Inherit a prison's initial values from its parent
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* (different from JAIL_SYS_INHERIT which also inherits changes).
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*/
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return linux_alloc_prison(pr, NULL);
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}
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static int
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linux_prison_check(void *obj __unused, void *data)
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{
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struct vfsoptlist *opts = data;
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char *osname, *osrelease;
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int error, jsys, len, osrel, oss_version;
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/* Check that the parameters are correct. */
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error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
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if (error != ENOENT) {
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if (error != 0)
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return (error);
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if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT)
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return (EINVAL);
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}
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error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
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if (error != ENOENT) {
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if (error != 0)
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return (error);
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if (len == 0 || osname[len - 1] != '\0')
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return (EINVAL);
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if (len > LINUX_MAX_UTSNAME) {
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vfs_opterror(opts, "linux.osname too long");
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return (ENAMETOOLONG);
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}
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}
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error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
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if (error != ENOENT) {
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if (error != 0)
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return (error);
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if (len == 0 || osrelease[len - 1] != '\0')
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return (EINVAL);
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if (len > LINUX_MAX_UTSNAME) {
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vfs_opterror(opts, "linux.osrelease too long");
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return (ENAMETOOLONG);
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}
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error = linux_map_osrel(osrelease, &osrel);
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if (error != 0) {
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vfs_opterror(opts, "linux.osrelease format error");
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return (error);
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}
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}
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error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
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sizeof(oss_version));
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return (error == ENOENT ? 0 : error);
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}
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static int
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linux_prison_set(void *obj, void *data)
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{
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struct linux_prison *lpr;
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struct prison *pr = obj;
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struct vfsoptlist *opts = data;
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char *osname, *osrelease;
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int error, gotversion, jsys, len, oss_version;
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/* Set the parameters, which should be correct. */
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error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
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if (error == ENOENT)
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jsys = -1;
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error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
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if (error == ENOENT)
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osname = NULL;
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else
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jsys = JAIL_SYS_NEW;
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error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
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if (error == ENOENT)
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osrelease = NULL;
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else
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jsys = JAIL_SYS_NEW;
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error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
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sizeof(oss_version));
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if (error == ENOENT)
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gotversion = 0;
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else {
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gotversion = 1;
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jsys = JAIL_SYS_NEW;
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}
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switch (jsys) {
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case JAIL_SYS_INHERIT:
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/* "linux=inherit": inherit the parent's Linux info. */
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mtx_lock(&pr->pr_mtx);
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osd_jail_del(pr, linux_osd_jail_slot);
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mtx_unlock(&pr->pr_mtx);
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break;
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case JAIL_SYS_NEW:
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/*
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* "linux=new" or "linux.*":
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* the prison gets its own Linux info.
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*/
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error = linux_alloc_prison(pr, &lpr);
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if (error) {
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mtx_unlock(&pr->pr_mtx);
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return (error);
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}
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if (osrelease) {
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error = linux_map_osrel(osrelease, &lpr->pr_osrel);
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if (error) {
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mtx_unlock(&pr->pr_mtx);
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return (error);
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}
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strlcpy(lpr->pr_osrelease, osrelease,
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LINUX_MAX_UTSNAME);
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}
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if (osname)
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strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
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if (gotversion)
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lpr->pr_oss_version = oss_version;
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mtx_unlock(&pr->pr_mtx);
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}
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return (0);
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}
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SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters");
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SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME,
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"Jail Linux kernel OS name");
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SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME,
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"Jail Linux kernel OS release");
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SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW,
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"I", "Jail Linux OSS version");
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static int
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linux_prison_get(void *obj, void *data)
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{
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struct linux_prison *lpr;
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struct prison *ppr;
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struct prison *pr = obj;
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struct vfsoptlist *opts = data;
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int error, i;
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static int version0;
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/* See if this prison is the one with the Linux info. */
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lpr = linux_find_prison(pr, &ppr);
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i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
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error = vfs_setopt(opts, "linux", &i, sizeof(i));
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if (error != 0 && error != ENOENT)
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goto done;
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if (i) {
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error = vfs_setopts(opts, "linux.osname", lpr->pr_osname);
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if (error != 0 && error != ENOENT)
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goto done;
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error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease);
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if (error != 0 && error != ENOENT)
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goto done;
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error = vfs_setopt(opts, "linux.oss_version",
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&lpr->pr_oss_version, sizeof(lpr->pr_oss_version));
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if (error != 0 && error != ENOENT)
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goto done;
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} else {
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/*
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* If this prison is inheriting its Linux info, report
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* empty/zero parameters.
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*/
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error = vfs_setopts(opts, "linux.osname", "");
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if (error != 0 && error != ENOENT)
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goto done;
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error = vfs_setopts(opts, "linux.osrelease", "");
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if (error != 0 && error != ENOENT)
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goto done;
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error = vfs_setopt(opts, "linux.oss_version", &version0,
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sizeof(lpr->pr_oss_version));
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if (error != 0 && error != ENOENT)
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goto done;
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}
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error = 0;
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done:
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mtx_unlock(&ppr->pr_mtx);
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return (error);
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}
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|
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static void
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linux_prison_destructor(void *data)
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{
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free(data, M_PRISON);
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}
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|
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void
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linux_osd_jail_register(void)
|
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{
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struct prison *pr;
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osd_method_t methods[PR_MAXMETHOD] = {
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[PR_METHOD_CREATE] = linux_prison_create,
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[PR_METHOD_GET] = linux_prison_get,
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[PR_METHOD_SET] = linux_prison_set,
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[PR_METHOD_CHECK] = linux_prison_check
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};
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|
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linux_osd_jail_slot =
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osd_jail_register(linux_prison_destructor, methods);
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if (linux_osd_jail_slot > 0) {
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/* Copy the system linux info to any current prisons. */
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sx_xlock(&allprison_lock);
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TAILQ_FOREACH(pr, &allprison, pr_list)
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(void)linux_alloc_prison(pr, NULL);
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sx_xunlock(&allprison_lock);
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}
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}
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|
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void
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linux_osd_jail_deregister(void)
|
|
{
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|
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if (linux_osd_jail_slot)
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|
osd_jail_deregister(linux_osd_jail_slot);
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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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struct prison *pr;
|
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struct linux_prison *lpr;
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lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
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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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}
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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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lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
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strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
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mtx_unlock(&pr->pr_mtx);
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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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struct prison *pr;
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struct linux_prison *lpr;
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lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
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bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME);
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mtx_unlock(&pr->pr_mtx);
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}
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|
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int
|
|
linux_kernver(struct thread *td)
|
|
{
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|
struct prison *pr;
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|
struct linux_prison *lpr;
|
|
int osrel;
|
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|
|
lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
|
|
osrel = lpr->pr_osrel;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (osrel);
|
|
}
|
|
|
|
int
|
|
linux_set_osrelease(struct thread *td, char *osrelease)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
int error;
|
|
|
|
lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
|
|
error = linux_map_osrel(osrelease, &lpr->pr_osrel);
|
|
if (error == 0)
|
|
strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
linux_get_oss_version(struct thread *td)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
int version;
|
|
|
|
lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
|
|
version = lpr->pr_oss_version;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (version);
|
|
}
|
|
|
|
int
|
|
linux_set_oss_version(struct thread *td, int oss_version)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
|
|
lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
|
|
lpr->pr_oss_version = oss_version;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (0);
|
|
}
|
|
|
|
#if defined(DEBUG) || defined(KTR)
|
|
|
|
u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
|
|
|
|
static int
|
|
linux_debug(int syscall, int toggle, int global)
|
|
{
|
|
|
|
if (global) {
|
|
char c = toggle ? 0 : 0xff;
|
|
|
|
memset(linux_debug_map, c, sizeof(linux_debug_map));
|
|
return (0);
|
|
}
|
|
if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
|
|
return (EINVAL);
|
|
if (toggle)
|
|
clrbit(linux_debug_map, syscall);
|
|
else
|
|
setbit(linux_debug_map, syscall);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Usage: sysctl linux.debug=<syscall_nr>.<0/1>
|
|
*
|
|
* E.g.: sysctl linux.debug=21.0
|
|
*
|
|
* As a special case, syscall "all" will apply to all syscalls globally.
|
|
*/
|
|
#define LINUX_MAX_DEBUGSTR 16
|
|
static int
|
|
linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char value[LINUX_MAX_DEBUGSTR], *p;
|
|
int error, sysc, toggle;
|
|
int global = 0;
|
|
|
|
value[0] = '\0';
|
|
error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
|
|
if (error || req->newptr == NULL)
|
|
return (error);
|
|
for (p = value; *p != '\0' && *p != '.'; p++);
|
|
if (*p == '\0')
|
|
return (EINVAL);
|
|
*p++ = '\0';
|
|
sysc = strtol(value, NULL, 0);
|
|
toggle = strtol(p, NULL, 0);
|
|
if (strcmp(value, "all") == 0)
|
|
global = 1;
|
|
error = linux_debug(sysc, toggle, global);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
|
|
CTLTYPE_STRING | CTLFLAG_RW,
|
|
0, 0, linux_sysctl_debug, "A",
|
|
"Linux debugging control");
|
|
|
|
#endif /* DEBUG || KTR */
|