From: Christian Brauner <christian.brauner@ubuntu.com>
To: Stefan Berger <stefanb@linux.ibm.com>
Cc: linux-integrity@vger.kernel.org, zohar@linux.ibm.com,
serge@hallyn.com, containers@lists.linux.dev,
dmitry.kasatkin@gmail.com, ebiederm@xmission.com,
krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com,
mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com,
puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com,
linux-kernel@vger.kernel.org, paul@paul-moore.com,
rgb@redhat.com, linux-security-module@vger.kernel.org,
jmorris@namei.org,
James Bottomley <James.Bottomley@HansenPartnership.com>
Subject: Re: [PATCH v6 12/17] securityfs: Extend securityfs with namespacing support
Date: Sat, 11 Dec 2021 11:50:26 +0100 [thread overview]
Message-ID: <20211211105026.pq5stw23gh5na3eq@wittgenstein> (raw)
In-Reply-To: <20211210194736.1538863-13-stefanb@linux.ibm.com>
On Fri, Dec 10, 2021 at 02:47:31PM -0500, Stefan Berger wrote:
> Extend 'securityfs' for support of IMA namespacing so that each
> IMA (user) namespace can have its own front-end for showing the currently
> active policy, the measurement list, number of violations and so on.
>
> Drop the addition dentry reference and simplify cleanup to work without
> the additional reference. This enables simple cleanup of dentries upon
> umount.
>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
> ---
> security/inode.c | 14 ++++----------
> 1 file changed, 4 insertions(+), 10 deletions(-)
>
> diff --git a/security/inode.c b/security/inode.c
> index fee01ff4d831..c77ae8ecc464 100644
> --- a/security/inode.c
> +++ b/security/inode.c
> @@ -54,7 +54,7 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
>
> static int securityfs_get_tree(struct fs_context *fc)
> {
> - return get_tree_single(fc, securityfs_fill_super);
> + return get_tree_keyed(fc, securityfs_fill_super, fc->user_ns);
> }
>
> static const struct fs_context_operations securityfs_context_ops = {
> @@ -72,6 +72,7 @@ static struct file_system_type fs_type = {
> .name = "securityfs",
> .init_fs_context = securityfs_init_fs_context,
> .kill_sb = kill_litter_super,
> + .fs_flags = FS_USERNS_MOUNT,
> };
>
> /**
> @@ -168,7 +169,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
> inode->i_fop = fops;
> }
> d_instantiate(dentry, inode);
> - dget(dentry);
> inode_unlock(dir);
> return dentry;
>
> @@ -306,23 +306,17 @@ EXPORT_SYMBOL_GPL(securityfs_create_symlink);
> void securityfs_remove(struct dentry *dentry)
> {
> struct user_namespace *ns;
> - struct inode *dir;
>
> if (!dentry || IS_ERR(dentry))
> return;
>
> ns = dentry->d_sb->s_user_ns;
>
> - dir = d_inode(dentry->d_parent);
> - inode_lock(dir);
> if (simple_positive(dentry)) {
> - if (d_is_dir(dentry))
> - simple_rmdir(dir, dentry);
> - else
> - simple_unlink(dir, dentry);
> + d_delete(dentry);
> dput(dentry);
In
https://lore.kernel.org/lkml/20211210114934.tacjnwryihrsx6ln@wittgenstein
I explained why d_delete()+d_put() only is wrong and how to fix it.
next prev parent reply other threads:[~2021-12-11 10:50 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-10 19:47 [PATCH v6 00/17] ima: Namespace IMA with audit support in IMA-ns Stefan Berger
2021-12-10 19:47 ` [PATCH v6 01/17] ima: Add IMA namespace support Stefan Berger
2021-12-13 21:11 ` Stefan Berger
2021-12-15 19:41 ` Mimi Zohar
2021-12-15 21:10 ` Mimi Zohar
2021-12-16 2:34 ` Stefan Berger
2021-12-10 19:47 ` [PATCH v6 02/17] ima: Define ns_status for storing namespaced iint data Stefan Berger
2021-12-15 21:12 ` Mimi Zohar
2021-12-16 2:37 ` Stefan Berger
2021-12-16 3:53 ` Mimi Zohar
2021-12-16 4:00 ` Stefan Berger
2021-12-10 19:47 ` [PATCH v6 03/17] ima: Namespace audit status flags Stefan Berger
2021-12-15 21:15 ` Mimi Zohar
2021-12-16 2:38 ` Stefan Berger
2021-12-16 3:54 ` Mimi Zohar
2021-12-10 19:47 ` [PATCH v6 04/17] ima: Move delayed work queue and variables into ima_namespace Stefan Berger
2021-12-10 19:47 ` [PATCH v6 05/17] ima: Move IMA's keys queue related " Stefan Berger
2021-12-10 19:47 ` [PATCH v6 06/17] ima: Move policy " Stefan Berger
2021-12-13 21:15 ` Stefan Berger
2021-12-10 19:47 ` [PATCH v6 07/17] ima: Move ima_htable " Stefan Berger
2021-12-10 19:47 ` [PATCH v6 08/17] ima: Move measurement list related variables " Stefan Berger
2021-12-10 19:47 ` [PATCH v6 09/17] ima: Only accept AUDIT rules for IMA non-init_ima_ns namespaces for now Stefan Berger
2021-12-10 19:47 ` [PATCH v6 10/17] ima: Implement hierarchical processing of file accesses Stefan Berger
2021-12-10 19:47 ` [PATCH v6 11/17] securityfs: Only use simple_pin_fs/simple_release_fs for init_user_ns Stefan Berger
2021-12-10 19:47 ` [PATCH v6 12/17] securityfs: Extend securityfs with namespacing support Stefan Berger
2021-12-11 10:50 ` Christian Brauner [this message]
2021-12-11 22:31 ` Stefan Berger
2021-12-10 19:47 ` [PATCH v6 13/17] ima: Move some IMA policy and filesystem related variables into ima_namespace Stefan Berger
2021-12-10 19:47 ` [PATCH v6 14/17] ima: Tie opened SecurityFS files to the IMA namespace it belongs to Stefan Berger
2021-12-11 11:00 ` Christian Brauner
2021-12-11 22:33 ` Stefan Berger
2021-12-10 19:47 ` [PATCH v6 15/17] ima: Use mac_admin_ns_capable() to check corresponding capability Stefan Berger
2021-12-11 15:29 ` Serge E. Hallyn
2021-12-11 16:05 ` James Bottomley
2021-12-11 19:22 ` Serge E. Hallyn
2021-12-11 20:12 ` James Bottomley
2021-12-10 19:47 ` [PATCH v6 16/17] ima: Move dentry into ima_namespace and others onto stack Stefan Berger
2021-12-10 19:47 ` [PATCH v6 17/17] ima: Setup securityfs for IMA namespace Stefan Berger
2021-12-15 21:31 ` Mimi Zohar
2021-12-16 2:41 ` Stefan Berger
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