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[src/trunk]: src/sys/fs/ptyfs Handle multiple ptyfs mounts with different chr...
details: https://anonhg.NetBSD.org/src/rev/ae385f6afaad
branches: trunk
changeset: 795239:ae385f6afaad
user: christos <christos%NetBSD.org@localhost>
date: Fri Apr 04 18:10:29 2014 +0000
description:
Handle multiple ptyfs mounts with different chroots. ptys opened in one
chroot are only visible in that chroot.
diffstat:
sys/fs/ptyfs/ptyfs.h | 4 ++-
sys/fs/ptyfs/ptyfs_vfsops.c | 60 +++++++++++++++++++++++++++++++++++++++------
sys/fs/ptyfs/ptyfs_vnops.c | 29 +++++++++++++++++++--
3 files changed, 81 insertions(+), 12 deletions(-)
diffs (214 lines):
diff -r bda9223d11e9 -r ae385f6afaad sys/fs/ptyfs/ptyfs.h
--- a/sys/fs/ptyfs/ptyfs.h Fri Apr 04 17:18:46 2014 +0000
+++ b/sys/fs/ptyfs/ptyfs.h Fri Apr 04 18:10:29 2014 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ptyfs.h,v 1.11 2014/03/21 17:21:53 christos Exp $ */
+/* $NetBSD: ptyfs.h,v 1.12 2014/04/04 18:10:29 christos Exp $ */
/*
* Copyright (c) 1993
@@ -106,6 +106,8 @@
};
struct ptyfsmount {
+ TAILQ_ENTRY(ptyfsmount) pmnt_le;
+ struct mount *pmnt_mp;
gid_t pmnt_gid;
mode_t pmnt_mode;
int pmnt_flags;
diff -r bda9223d11e9 -r ae385f6afaad sys/fs/ptyfs/ptyfs_vfsops.c
--- a/sys/fs/ptyfs/ptyfs_vfsops.c Fri Apr 04 17:18:46 2014 +0000
+++ b/sys/fs/ptyfs/ptyfs_vfsops.c Fri Apr 04 18:10:29 2014 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ptyfs_vfsops.c,v 1.48 2014/03/27 17:31:56 christos Exp $ */
+/* $NetBSD: ptyfs_vfsops.c,v 1.49 2014/04/04 18:10:29 christos Exp $ */
/*
* Copyright (c) 1992, 1993, 1995
@@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ptyfs_vfsops.c,v 1.48 2014/03/27 17:31:56 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ptyfs_vfsops.c,v 1.49 2014/04/04 18:10:29 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -77,6 +77,7 @@
static int ptyfs__makename(struct mount *, struct lwp *, char *, size_t,
dev_t, char);
static void ptyfs__getvattr(struct mount *, struct lwp *, struct vattr *);
+static int ptyfs__getmp(struct lwp *, struct mount **);
/*
* ptm glue: When we mount, we make ptm point to us.
@@ -84,13 +85,37 @@
struct ptm_pty *ptyfs_save_ptm;
static int ptyfs_count;
+static TAILQ_HEAD(, ptyfsmount) ptyfs_head;
+
struct ptm_pty ptm_ptyfspty = {
ptyfs__allocvp,
ptyfs__makename,
ptyfs__getvattr,
- NULL
+ ptyfs__getmp,
};
+static int
+ptyfs__getmp(struct lwp *l, struct mount **mpp)
+{
+ struct cwdinfo *cwdi = l->l_proc->p_cwdi;
+ struct mount *mp;
+ struct ptyfsmount *pmnt;
+
+ TAILQ_FOREACH(pmnt, &ptyfs_head, pmnt_le) {
+ mp = pmnt->pmnt_mp;
+ if (cwdi->cwdi_rdir == NULL)
+ goto ok;
+
+ if (vn_isunder(mp->mnt_vnodecovered, cwdi->cwdi_rdir, l))
+ goto ok;
+ }
+ *mpp = NULL;
+ return EOPNOTSUPP;
+ok:
+ *mpp = mp;
+ return 0;
+}
+
static const char *
ptyfs__getpath(struct lwp *l, const struct mount *mp)
{
@@ -137,6 +162,18 @@
len = snprintf(tbuf, bufsiz, "/dev/null");
break;
case 't':
+ /*
+ * We support traditional ptys, so we can get here,
+ * if pty had been opened before PTYFS was mounted,
+ * or was opened through /dev/ptyXX devices.
+ * Return it only outside chroot for more security .
+ */
+ if (l->l_proc->p_cwdi->cwdi_rdir == NULL
+ && ptyfs_save_ptm != NULL
+ && ptyfs_used_get(PTYFSptc, minor(dev), mp, 0) == NULL)
+ return (*ptyfs_save_ptm->makename)(mp, l,
+ tbuf, bufsiz, dev, ms);
+
np = ptyfs__getpath(l, mp);
if (np == NULL)
return EOPNOTSUPP;
@@ -189,6 +226,7 @@
ptyfs_init(void)
{
+ TAILQ_INIT(&ptyfs_head);
malloc_type_attach(M_PTYFSMNT);
malloc_type_attach(M_PTYFSTMP);
ptyfs_hashinit();
@@ -274,12 +312,12 @@
return error;
}
- /* Point pty access to us */
- if (ptyfs_count == 0) {
- ptm_ptyfspty.arg = mp;
+ pmnt->pmnt_mp = mp;
+ TAILQ_INSERT_TAIL(&ptyfs_head, pmnt, pmnt_le);
+ if (ptyfs_count++ == 0) {
+ /* Point pty access to us */
ptyfs_save_ptm = pty_sethandler(&ptm_ptyfspty);
}
- ptyfs_count++;
return 0;
}
@@ -296,6 +334,7 @@
{
int error;
int flags = 0;
+ struct ptyfsmount *pmnt;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
@@ -308,8 +347,13 @@
/* Restore where pty access was pointing */
(void)pty_sethandler(ptyfs_save_ptm);
ptyfs_save_ptm = NULL;
- ptm_ptyfspty.arg = NULL;
}
+ TAILQ_FOREACH(pmnt, &ptyfs_head, pmnt_le) {
+ if (pmnt->pmnt_mp == mp) {
+ TAILQ_REMOVE(&ptyfs_head, pmnt, pmnt_le);
+ break;
+ }
+ }
/*
* Finally, throw away the ptyfsmount structure
diff -r bda9223d11e9 -r ae385f6afaad sys/fs/ptyfs/ptyfs_vnops.c
--- a/sys/fs/ptyfs/ptyfs_vnops.c Fri Apr 04 17:18:46 2014 +0000
+++ b/sys/fs/ptyfs/ptyfs_vnops.c Fri Apr 04 18:10:29 2014 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ptyfs_vnops.c,v 1.45 2014/03/27 21:13:06 christos Exp $ */
+/* $NetBSD: ptyfs_vnops.c,v 1.46 2014/04/04 18:10:29 christos Exp $ */
/*
* Copyright (c) 1993, 1995
@@ -76,7 +76,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.45 2014/03/27 21:13:06 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.46 2014/04/04 18:10:29 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -141,6 +141,7 @@
#define ptyfs_readlink genfs_eopnotsupp
#define ptyfs_abortop genfs_abortop
int ptyfs_reclaim (void *);
+int ptyfs_inactive (void *);
#define ptyfs_lock genfs_lock
#define ptyfs_unlock genfs_unlock
#define ptyfs_bmap genfs_badop
@@ -192,7 +193,7 @@
{ &vop_readdir_desc, ptyfs_readdir }, /* readdir */
{ &vop_readlink_desc, ptyfs_readlink }, /* readlink */
{ &vop_abortop_desc, ptyfs_abortop }, /* abortop */
- { &vop_inactive_desc, spec_inactive }, /* inactive */
+ { &vop_inactive_desc, ptyfs_inactive }, /* inactive */
{ &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */
{ &vop_lock_desc, ptyfs_lock }, /* lock */
{ &vop_unlock_desc, ptyfs_unlock }, /* unlock */
@@ -225,6 +226,28 @@
return ptyfs_freevp(ap->a_vp);
}
+int
+ptyfs_inactive(void *v)
+{
+ struct vop_inactive_args /* {
+ struct vnode *a_vp;
+ bool *a_recycle;
+ } */ *ap = v;
+ struct vnode *vp = ap->a_vp;
+ struct ptyfsnode *ptyfs = VTOPTYFS(vp);
+
+ switch (ptyfs->ptyfs_type) {
+ case PTYFSpts:
+ case PTYFSptc:
+ /* Emulate file deletion for call reclaim(). */
+ *ap->a_recycle = true;
+ break;
+ default:
+ break;
+ }
+ return spec_inactive(v);
+}
+
/*
* Return POSIX pathconf information applicable to special devices.
*/
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