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Fix a hole in jail(2).

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Noticed by:	Alexander Bezroutchko <abb@zenon.net>
This commit is contained in:
Poul-Henning Kamp 1999-09-25 14:14:21 +00:00
parent 46783fb897
commit 2fe5bd8bb8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=51649
7 changed files with 24 additions and 2 deletions
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7
sys/kern/kern_descrip.c
View File

@ -885,6 +885,9 @@ fdinit(p)
VREF(newfdp->fd_fd.fd_cdir);
newfdp->fd_fd.fd_rdir = fdp->fd_rdir;
VREF(newfdp->fd_fd.fd_rdir);
newfdp->fd_fd.fd_jdir = fdp->fd_jdir;
if (newfdp->fd_fd.fd_jdir)
VREF(newfdp->fd_fd.fd_jdir);
/* Create the file descriptor table. */
newfdp->fd_fd.fd_refcnt = 1;
@ -932,6 +935,8 @@ fdcopy(p)
bcopy(fdp, newfdp, sizeof(struct filedesc));
VREF(newfdp->fd_cdir);
VREF(newfdp->fd_rdir);
if (newfdp->fd_jdir)
VREF(newfdp->fd_jdir);
newfdp->fd_refcnt = 1;
/*
@ -995,6 +1000,8 @@ fdfree(p)
FREE(fdp->fd_ofiles, M_FILEDESC);
vrele(fdp->fd_cdir);
vrele(fdp->fd_rdir);
if(fdp->fd_jdir)
vrele(fdp->fd_jdir);
FREE(fdp, M_FILEDESC);
}

4
sys/kern/vfs_extattr.c
View File

@ -910,6 +910,10 @@ chroot(p, uap)
return (error);
vrele(fdp->fd_rdir);
fdp->fd_rdir = nd.ni_vp;
if (!fdp->fd_jdir) {
fdp->fd_jdir = nd.ni_vp;
VREF(fdp->fd_jdir);
}
return (0);
}

7
sys/kern/vfs_lookup.c
View File

@ -130,6 +130,7 @@ namei(ndp)
* Get starting point for the translation.
*/
ndp->ni_rootdir = fdp->fd_rdir;
ndp->ni_topdir = fdp->fd_jdir;
dp = fdp->fd_cdir;
VREF(dp);
@ -387,10 +388,14 @@ dirloop:
* filesystem, then replace it with the
* vnode which was mounted on so we take the
* .. in the other file system.
* 3. If the vnode is the top directory of
* the jail or chroot, don't let them out.
*/
if (cnp->cn_flags & ISDOTDOT) {
for (;;) {
if (dp == ndp->ni_rootdir || dp == rootvnode) {
if (dp == ndp->ni_rootdir ||
dp == ndp->ni_topdir ||
dp == rootvnode) {
ndp->ni_dvp = dp;
ndp->ni_vp = dp;
VREF(dp);

4
sys/kern/vfs_syscalls.c
View File

@ -910,6 +910,10 @@ chroot(p, uap)
return (error);
vrele(fdp->fd_rdir);
fdp->fd_rdir = nd.ni_vp;
if (!fdp->fd_jdir) {
fdp->fd_jdir = nd.ni_vp;
VREF(fdp->fd_jdir);
}
return (0);
}

1
sys/sys/filedesc.h
View File

@ -61,6 +61,7 @@ struct filedesc {
char *fd_ofileflags; /* per-process open file flags */
struct vnode *fd_cdir; /* current directory */
struct vnode *fd_rdir; /* root directory */
struct vnode *fd_jdir; /* jail root directory */
int fd_nfiles; /* number of open files allocated */
u_short fd_lastfile; /* high-water mark of fd_ofiles */
u_short fd_freefile; /* approx. next free file */

1
sys/sys/namei.h
View File

@ -58,6 +58,7 @@ struct nameidata {
/* struct ucred *ni_cred; credentials */
struct vnode *ni_startdir; /* starting directory */
struct vnode *ni_rootdir; /* logical root directory */
struct vnode *ni_topdir; /* logical top directory */
/*
* Results: returned from/manipulated by lookup
*/

2
sys/sys/param.h
View File

@ -46,7 +46,7 @@
#define BSD4_3 1
#define BSD4_4 1
#undef __FreeBSD_version
#define __FreeBSD_version 400009 /* Master, propagated to newvers */
#define __FreeBSD_version 400010 /* Master, propagated to newvers */
#ifndef NULL
#define NULL 0