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From: Paul Moore <[email protected]>
To: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], Jens Axboe <[email protected]>,
	Pavel Begunkov <[email protected]>,
	Kumar Kartikeya Dwivedi <[email protected]>
Subject: [PATCH v3 4/8] fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure()
Date: Mon, 13 Sep 2021 23:33:16 -0400	[thread overview]
Message-ID: <163159039643.470089.15401020922378832012.stgit@olly> (raw)
In-Reply-To: <163159032713.470089.11728103630366176255.stgit@olly>

Extending the secure anonymous inode support to other subsystems
requires that we have a secure anon_inode_getfile() variant in
addition to the existing secure anon_inode_getfd() variant.

Thankfully we can reuse the existing __anon_inode_getfile() function
and just wrap it with the proper arguments.

Acked-by: Mickaël Salaün <[email protected]>
Signed-off-by: Paul Moore <[email protected]>

---
v3:
- no change
v2:
- no change
v1:
- initial draft
---
 fs/anon_inodes.c            |   29 +++++++++++++++++++++++++++++
 include/linux/anon_inodes.h |    4 ++++
 2 files changed, 33 insertions(+)

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index a280156138ed..e0c3e33c4177 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -148,6 +148,35 @@ struct file *anon_inode_getfile(const char *name,
 }
 EXPORT_SYMBOL_GPL(anon_inode_getfile);
 
+/**
+ * anon_inode_getfile_secure - Like anon_inode_getfile(), but creates a new
+ *                             !S_PRIVATE anon inode rather than reuse the
+ *                             singleton anon inode and calls the
+ *                             inode_init_security_anon() LSM hook.  This
+ *                             allows for both the inode to have its own
+ *                             security context and for the LSM to enforce
+ *                             policy on the inode's creation.
+ *
+ * @name:    [in]    name of the "class" of the new file
+ * @fops:    [in]    file operations for the new file
+ * @priv:    [in]    private data for the new file (will be file's private_data)
+ * @flags:   [in]    flags
+ * @context_inode:
+ *           [in]    the logical relationship with the new inode (optional)
+ *
+ * The LSM may use @context_inode in inode_init_security_anon(), but a
+ * reference to it is not held.  Returns the newly created file* or an error
+ * pointer.  See the anon_inode_getfile() documentation for more information.
+ */
+struct file *anon_inode_getfile_secure(const char *name,
+				       const struct file_operations *fops,
+				       void *priv, int flags,
+				       const struct inode *context_inode)
+{
+	return __anon_inode_getfile(name, fops, priv, flags,
+				    context_inode, true);
+}
+
 static int __anon_inode_getfd(const char *name,
 			      const struct file_operations *fops,
 			      void *priv, int flags,
diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h
index 71881a2b6f78..5deaddbd7927 100644
--- a/include/linux/anon_inodes.h
+++ b/include/linux/anon_inodes.h
@@ -15,6 +15,10 @@ struct inode;
 struct file *anon_inode_getfile(const char *name,
 				const struct file_operations *fops,
 				void *priv, int flags);
+struct file *anon_inode_getfile_secure(const char *name,
+				       const struct file_operations *fops,
+				       void *priv, int flags,
+				       const struct inode *context_inode);
 int anon_inode_getfd(const char *name, const struct file_operations *fops,
 		     void *priv, int flags);
 int anon_inode_getfd_secure(const char *name,


  parent reply	other threads:[~2021-09-14  3:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-14  3:32 [PATCH v3 0/8] Add LSM access controls and auditing to io_uring Paul Moore
2021-09-14  3:32 ` [PATCH v3 1/8] audit: prepare audit_context for use in calling contexts beyond syscalls Paul Moore
2021-09-14  3:33 ` [PATCH v3 2/8] audit,io_uring,io-wq: add some basic audit support to io_uring Paul Moore
2021-09-14  3:33 ` [PATCH v3 3/8] audit: add filtering for io_uring records Paul Moore
2021-09-14  3:33 ` Paul Moore [this message]
2021-09-14  3:33 ` [PATCH v3 5/8] io_uring: convert io_uring to the secure anon inode interface Paul Moore
2021-09-14  3:33 ` [PATCH v3 6/8] lsm,io_uring: add LSM hooks to io_uring Paul Moore
2021-09-14  3:33 ` [PATCH v3 7/8] selinux: add support for the io_uring access controls Paul Moore
2021-09-14  3:33 ` [PATCH v3 8/8] Smack: Brutalist io_uring support with debug Paul Moore

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