bb419e1b5b
No need to lock prison in a case of linux_use26 because the int setting is atomic and process cannot leave jail. Submitted by: kib Reviewed by: jhb Requested by: rdivacky
382 lines
9.2 KiB
C
382 lines
9.2 KiB
C
/*-
|
|
* Copyright (c) 1999 Marcel Moolenaar
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in this position and unchanged.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
|
|
#include "opt_compat.h"
|
|
|
|
#ifdef COMPAT_LINUX32
|
|
#include <machine/../linux32/linux.h>
|
|
#else
|
|
#include <machine/../linux/linux.h>
|
|
#endif
|
|
#include <compat/linux/linux_mib.h>
|
|
|
|
struct linux_prison {
|
|
char pr_osname[LINUX_MAX_UTSNAME];
|
|
char pr_osrelease[LINUX_MAX_UTSNAME];
|
|
int pr_oss_version;
|
|
int pr_use_linux26; /* flag to determine whether to use 2.6 emulation */
|
|
};
|
|
|
|
SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
|
|
"Linux mode");
|
|
|
|
static struct mtx osname_lock;
|
|
MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
|
|
|
|
static char linux_osname[LINUX_MAX_UTSNAME] = "Linux";
|
|
|
|
static int
|
|
linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char osname[LINUX_MAX_UTSNAME];
|
|
int error;
|
|
|
|
linux_get_osname(req->td, osname);
|
|
error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
|
|
if (error || req->newptr == NULL)
|
|
return (error);
|
|
error = linux_set_osname(req->td, osname);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
|
|
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
|
|
0, 0, linux_sysctl_osname, "A",
|
|
"Linux kernel OS name");
|
|
|
|
static char linux_osrelease[LINUX_MAX_UTSNAME] = "2.4.2";
|
|
static int linux_use_linux26 = 0;
|
|
|
|
static int
|
|
linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char osrelease[LINUX_MAX_UTSNAME];
|
|
int error;
|
|
|
|
linux_get_osrelease(req->td, osrelease);
|
|
error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
|
|
if (error || req->newptr == NULL)
|
|
return (error);
|
|
error = linux_set_osrelease(req->td, osrelease);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
|
|
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
|
|
0, 0, linux_sysctl_osrelease, "A",
|
|
"Linux kernel OS release");
|
|
|
|
static int linux_oss_version = 0x030600;
|
|
|
|
static int
|
|
linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int oss_version;
|
|
int error;
|
|
|
|
oss_version = linux_get_oss_version(req->td);
|
|
error = sysctl_handle_int(oidp, &oss_version, 0, req);
|
|
if (error || req->newptr == NULL)
|
|
return (error);
|
|
error = linux_set_oss_version(req->td, oss_version);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
|
|
0, 0, linux_sysctl_oss_version, "I",
|
|
"Linux OSS version");
|
|
|
|
/*
|
|
* Returns holding the prison mutex if return non-NULL.
|
|
*/
|
|
static struct prison *
|
|
linux_get_prison(struct thread *td)
|
|
{
|
|
register struct prison *pr;
|
|
register struct linux_prison *lpr;
|
|
|
|
KASSERT(td == curthread, ("linux_get_prison() called on !curthread"));
|
|
if (!jailed(td->td_ucred))
|
|
return (NULL);
|
|
pr = td->td_ucred->cr_prison;
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_linux == NULL) {
|
|
/*
|
|
* If we don't have a linux prison structure yet, allocate
|
|
* one. We have to handle the race where another thread
|
|
* could be adding a linux prison to this process already.
|
|
*/
|
|
mtx_unlock(&pr->pr_mtx);
|
|
lpr = malloc(sizeof(struct linux_prison), M_PRISON,
|
|
M_WAITOK | M_ZERO);
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_linux == NULL)
|
|
pr->pr_linux = lpr;
|
|
else
|
|
free(lpr, M_PRISON);
|
|
}
|
|
return (pr);
|
|
}
|
|
|
|
void
|
|
linux_get_osname(struct thread *td, char *dst)
|
|
{
|
|
register struct prison *pr;
|
|
register struct linux_prison *lpr;
|
|
|
|
pr = td->td_ucred->cr_prison;
|
|
if (pr != NULL) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_linux != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
if (lpr->pr_osname[0]) {
|
|
bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return;
|
|
}
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
mtx_lock(&osname_lock);
|
|
bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
|
|
mtx_unlock(&osname_lock);
|
|
}
|
|
|
|
int
|
|
linux_set_osname(struct thread *td, char *osname)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
|
|
pr = linux_get_prison(td);
|
|
if (pr != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
strcpy(lpr->pr_osname, osname);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
} else {
|
|
mtx_lock(&osname_lock);
|
|
strcpy(linux_osname, osname);
|
|
mtx_unlock(&osname_lock);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
linux_get_osrelease(struct thread *td, char *dst)
|
|
{
|
|
register struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
|
|
pr = td->td_ucred->cr_prison;
|
|
if (pr != NULL) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_linux != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
if (lpr->pr_osrelease[0]) {
|
|
bcopy(lpr->pr_osrelease, dst,
|
|
LINUX_MAX_UTSNAME);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return;
|
|
}
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
mtx_lock(&osname_lock);
|
|
bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
|
|
mtx_unlock(&osname_lock);
|
|
}
|
|
|
|
int
|
|
linux_use26(struct thread *td)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
int use26 = 0; /* defaults to off */
|
|
|
|
pr = td->td_ucred->cr_prison;
|
|
if (pr != NULL) {
|
|
if (pr->pr_linux != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
use26 = lpr->pr_use_linux26;
|
|
}
|
|
} else
|
|
use26 = linux_use_linux26;
|
|
|
|
return (use26);
|
|
}
|
|
|
|
int
|
|
linux_set_osrelease(struct thread *td, char *osrelease)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
int use26;
|
|
|
|
use26 = (strlen(osrelease) >= 3 && osrelease[2] == '6');
|
|
|
|
pr = linux_get_prison(td);
|
|
if (pr != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
strcpy(lpr->pr_osrelease, osrelease);
|
|
lpr->pr_use_linux26 = use26;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
} else {
|
|
mtx_lock(&osname_lock);
|
|
strcpy(linux_osrelease, osrelease);
|
|
linux_use_linux26 = use26;
|
|
mtx_unlock(&osname_lock);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
linux_get_oss_version(struct thread *td)
|
|
{
|
|
register struct prison *pr;
|
|
register struct linux_prison *lpr;
|
|
int version;
|
|
|
|
pr = td->td_ucred->cr_prison;
|
|
if (pr != NULL) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_linux != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
if (lpr->pr_oss_version) {
|
|
version = lpr->pr_oss_version;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (version);
|
|
}
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
mtx_lock(&osname_lock);
|
|
version = linux_oss_version;
|
|
mtx_unlock(&osname_lock);
|
|
return (version);
|
|
}
|
|
|
|
int
|
|
linux_set_oss_version(struct thread *td, int oss_version)
|
|
{
|
|
struct prison *pr;
|
|
struct linux_prison *lpr;
|
|
|
|
pr = linux_get_prison(td);
|
|
if (pr != NULL) {
|
|
lpr = (struct linux_prison *)pr->pr_linux;
|
|
lpr->pr_oss_version = oss_version;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
} else {
|
|
mtx_lock(&osname_lock);
|
|
linux_oss_version = oss_version;
|
|
mtx_unlock(&osname_lock);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
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 */
|