Add support to the jail framework to be able to mount linsysfs(5) and

linprocfs(5).

Differential Revision:	D2846
Submitted by:		Nikolai Lifanov <lifanov@mail.lifanov.com>
Reviewed by:		jamie

5 files changed, 40 insertions, 4 deletions

diff --git a/sys/compat/linprocfs/linprocfs.c b/sys/compat/linprocfs/linprocfs.c
index 2c28aa2..496afba 100644
--- a/sys/compat/linprocfs/linprocfs.c
+++ b/sys/compat/linprocfs/linprocfs.c
@@ -1548,7 +1548,7 @@ linprocfs_uninit(PFS_INIT_ARGS)
 	return (0);
 }
 
-PSEUDOFS(linprocfs, 1, 0);
+PSEUDOFS(linprocfs, 1, PR_ALLOW_MOUNT_LINPROCFS);
 #if defined(__amd64__)
 MODULE_DEPEND(linprocfs, linux_common, 1, 1, 1);
 #else
diff --git a/sys/compat/linsysfs/linsysfs.c b/sys/compat/linsysfs/linsysfs.c
index bc85ac3..0d5273c 100644
--- a/sys/compat/linsysfs/linsysfs.c
+++ b/sys/compat/linsysfs/linsysfs.c
@@ -275,7 +275,7 @@ linsysfs_uninit(PFS_INIT_ARGS)
 	return (0);
 }
 
-PSEUDOFS(linsysfs, 1, 0);
+PSEUDOFS(linsysfs, 1, PR_ALLOW_MOUNT_LINSYSFS);
 #if defined(__amd64__)
 MODULE_DEPEND(linsysfs, linux_common, 1, 1, 1);
 #else
diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
index 6bdddd7..05a5632 100644
--- a/sys/kern/kern_jail.c
+++ b/sys/kern/kern_jail.c
@@ -205,6 +205,8 @@ static char *pr_allow_names[] = {
 	"allow.mount.procfs",
 	"allow.mount.tmpfs",
 	"allow.mount.fdescfs",
+	"allow.mount.linprocfs",
+	"allow.mount.linsysfs",
 };
 const size_t pr_allow_names_size = sizeof(pr_allow_names);
 
@@ -222,6 +224,8 @@ static char *pr_allow_nonames[] = {
 	"allow.mount.noprocfs",
 	"allow.mount.notmpfs",
 	"allow.mount.nofdescfs",
+	"allow.mount.nolinprocfs",
+	"allow.mount.nolinsysfs",
 };
 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
 
@@ -4290,6 +4294,14 @@ SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
     NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
     "Processes in jail can mount the procfs file system");
+SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
+    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+    NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
+    "Processes in jail can mount the linprocfs file system");
+SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
+    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+    NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
+    "Processes in jail can mount the linsysfs file system");
 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
     NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
@@ -4456,6 +4468,10 @@ SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
     "B", "Jail may mount the nullfs file system");
 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
     "B", "Jail may mount the procfs file system");
+SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
+    "B", "Jail may mount the linprocfs file system");
+SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
+    "B", "Jail may mount the linsysfs file system");
 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
     "B", "Jail may mount the tmpfs file system");
 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
diff --git a/sys/sys/jail.h b/sys/sys/jail.h
index 916bd59..70e7085 100644
--- a/sys/sys/jail.h
+++ b/sys/sys/jail.h
@@ -230,7 +230,9 @@ struct prison_racct {
 #define	PR_ALLOW_MOUNT_PROCFS		0x0400
 #define	PR_ALLOW_MOUNT_TMPFS		0x0800
 #define	PR_ALLOW_MOUNT_FDESCFS		0x1000
-#define	PR_ALLOW_ALL			0x1fff
+#define	PR_ALLOW_MOUNT_LINPROCFS	0x2000
+#define	PR_ALLOW_MOUNT_LINSYSFS		0x4000
+#define	PR_ALLOW_ALL			0x7fff
 
 /*
  * OSD methods
diff --git a/usr.sbin/jail/jail.8 b/usr.sbin/jail/jail.8
index 189fa36..5122e0f 100644
--- a/usr.sbin/jail/jail.8
+++ b/usr.sbin/jail/jail.8
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 25, 2015
+.Dd July 20, 2015
 .Dt JAIL 8
 .Os
 .Sh NAME
@@ -563,6 +563,22 @@ This permission is effective only together with
 and only when
 .Va enforce_statfs
 is set to a value lower than 2.
+.It Va allow.mount.linprocfs
+privileged users inside the jail will be able to mount and unmount the
+linprocfs file system.
+This permission is effective only together with
+.Va allow.mount
+and only when
+.Va enforce_statfs
+is set to a value lower than 2.
+.It Va allow.mount.linsysfs
+privileged users inside the jail will be able to mount and unmount the
+linsysfs file system.
+This permission is effective only together with
+.Va allow.mount
+and only when
+.Va enforce_statfs
+is set to a value lower than 2.
 .It Va allow.mount.tmpfs
 privileged users inside the jail will be able to mount and unmount the
 tmpfs file system.
@@ -1209,6 +1225,8 @@ environment of the first jail.
 .Xr devfs 5 ,
 .Xr fdescfs 5 ,
 .Xr jail.conf 5 ,
+.Xr linprocfs 5 ,
+.Xr linsysfs 5 ,
 .Xr procfs 5 ,
 .Xr rc.conf 5 ,
 .Xr sysctl.conf 5 ,