Add genfs_can_mount() and use it to prevent some more code duplication of
the security checks when mounting a device (VOP_ACCESS() + kauth(9) call)). Proposed with no objections on tech-kern@: http://mail-index.netbsd.org/tech-kern/2009/04/20/msg004859.html The vnode is always expected to be locked, so no locking is done outside the file-system code.
This commit is contained in:
elad
parent
bab57db991
commit
54bf8cc67a
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@ -1,4 +1,4 @@
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/* $NetBSD: udf_vfsops.c,v 1.55 2009/02/08 19:04:41 reinoud Exp $ */
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/* $NetBSD: udf_vfsops.c,v 1.56 2009/04/25 18:53:45 elad Exp $ */
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/*
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* Copyright (c) 2006, 2008 Reinoud Zandijk
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@ -28,7 +28,7 @@
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#include <sys/cdefs.h>
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#ifndef lint
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__KERNEL_RCSID(0, "$NetBSD: udf_vfsops.c,v 1.55 2009/02/08 19:04:41 reinoud Exp $");
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__KERNEL_RCSID(0, "$NetBSD: udf_vfsops.c,v 1.56 2009/04/25 18:53:45 elad Exp $");
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#endif /* not lint */
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@ -378,17 +378,15 @@ udf_mount(struct mount *mp, const char *path,
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* If mount by non-root, then verify that user has necessary
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* permissions on the device.
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*/
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if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) {
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accessmode = VREAD;
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_ACCESS(devvp, accessmode, l->l_cred);
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VOP_UNLOCK(devvp, 0);
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if (error) {
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vrele(devvp);
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return error;
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}
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accessmode = VREAD;
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = genfs_can_mount(devvp, accessmode, l->l_cred);
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VOP_UNLOCK(devvp, 0);
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if (error) {
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vrele(devvp);
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return error;
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}
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/*
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@ -1,4 +1,4 @@
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/* $NetBSD: genfs.h,v 1.24 2009/04/22 22:57:08 elad Exp $ */
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/* $NetBSD: genfs.h,v 1.25 2009/04/25 18:53:44 elad Exp $ */
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#ifndef _MISCFS_GENFS_GENFS_H_
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#define _MISCFS_GENFS_GENFS_H_
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@ -38,5 +38,6 @@ void genfs_renamelock_exit(struct mount *);
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int genfs_can_chmod(vnode_t *, kauth_cred_t, uid_t, gid_t, mode_t);
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int genfs_can_chown(vnode_t *, kauth_cred_t, uid_t, gid_t, uid_t, gid_t);
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int genfs_can_mount(vnode_t *, mode_t, kauth_cred_t);
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#endif /* !_MISCFS_GENFS_GENFS_H_ */
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@ -1,4 +1,4 @@
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/* $NetBSD: genfs_vnops.c,v 1.169 2009/04/22 22:57:08 elad Exp $ */
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/* $NetBSD: genfs_vnops.c,v 1.170 2009/04/25 18:53:44 elad Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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@ -57,7 +57,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.169 2009/04/22 22:57:08 elad Exp $");
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__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.170 2009/04/25 18:53:44 elad Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -642,3 +642,26 @@ genfs_can_chown(vnode_t *vp, kauth_cred_t cred, uid_t cur_uid,
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return (0);
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}
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/*
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* Common routine to check if the device can be mounted.
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*
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* devvp - the locked vnode of the device
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* cred - credentials of the invoker
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* accessmode - the accessmode (VREAD, VWRITE)
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*
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* Returns 0 if the mount is allowed, or an error value otherwise.
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*/
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int
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genfs_can_mount(vnode_t *devvp, mode_t accessmode, kauth_cred_t cred)
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{
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int error;
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/* Always allow for root. */
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error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL);
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if (!error)
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return (0);
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error = VOP_ACCESS(devvp, accessmode, cred);
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return (error);
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: ext2fs_vfsops.c,v 1.142 2009/03/01 15:59:57 christos Exp $ */
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/* $NetBSD: ext2fs_vfsops.c,v 1.143 2009/04/25 18:53:45 elad Exp $ */
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/*
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* Copyright (c) 1989, 1991, 1993, 1994
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@ -65,7 +65,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.142 2009/03/01 15:59:57 christos Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.143 2009/04/25 18:53:45 elad Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_compat_netbsd.h"
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@ -380,18 +380,19 @@ ext2fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
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/*
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* If mount by non-root, then verify that user has necessary
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* permissions on the device.
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*
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* Permission to update a mount is checked higher, so here we presume
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* updating the mount is okay (for example, as far as securelevel goes)
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* which leaves us with the normal check.
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*/
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if (error == 0 && kauth_authorize_generic(l->l_cred,
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KAUTH_GENERIC_ISSUSER, NULL) != 0) {
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accessmode = VREAD;
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if (update ?
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(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
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(mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_ACCESS(devvp, accessmode, l->l_cred);
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VOP_UNLOCK(devvp, 0);
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}
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accessmode = VREAD;
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if (update ?
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(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
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(mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = genfs_can_mount(devvp, accessmode, l->l_cred);
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VOP_UNLOCK(devvp, 0);
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if (error) {
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vrele(devvp);
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@ -1,4 +1,4 @@
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/* $NetBSD: ffs_vfsops.c,v 1.245 2009/03/29 10:29:00 ad Exp $ */
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/* $NetBSD: ffs_vfsops.c,v 1.246 2009/04/25 18:53:45 elad Exp $ */
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/*-
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* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
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@ -61,7 +61,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.245 2009/03/29 10:29:00 ad Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.246 2009/04/25 18:53:45 elad Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_ffs.h"
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@ -381,18 +381,19 @@ ffs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
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/*
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* If mount by non-root, then verify that user has necessary
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* permissions on the device.
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*
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* Permission to update a mount is checked higher, so here we presume
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* updating the mount is okay (for example, as far as securelevel goes)
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* which leaves us with the normal check.
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*/
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if (error == 0 && kauth_authorize_generic(l->l_cred,
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KAUTH_GENERIC_ISSUSER, NULL) != 0) {
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accessmode = VREAD;
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if (update ?
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(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
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(mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_ACCESS(devvp, accessmode, l->l_cred);
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VOP_UNLOCK(devvp, 0);
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}
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accessmode = VREAD;
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if (update ?
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(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
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(mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = genfs_can_mount(devvp, accessmode, l->l_cred);
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VOP_UNLOCK(devvp, 0);
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if (error) {
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vrele(devvp);
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