linux-kernel - [PATCH 1/2] fs: anon_inodes: export anon_inode_getfile

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Date:   Wed, 19 May 2021 17:00:56 +0530
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     io-uring@...r.kernel.org
Cc:     Pavel Emelyanov <xemul@...nvz.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Lokesh Gidra <lokeshgidra@...gle.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Paul Moore <paul@...l-moore.com>,
        Daniel Colascione <dancol@...gle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH  1/2] fs: anon_inodes: export anon_inode_getfile_secure helper

This is the non-fd installing analogue of anon_inode_getfd_secure. In
addition to allowing LSMs to attach policy to the distinct inode, this
is also needed for checkpoint restore of an io_uring instance where a
mapped region needs to mapped back to the io_uring fd by CRIU. This is
currently not possible as all anon_inodes share a single inode.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
 fs/anon_inodes.c            | 9 +++++++++
 include/linux/anon_inodes.h | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index a280156138ed..37032786b211 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -148,6 +148,15 @@ struct file *anon_inode_getfile(const char *name,
 }
 EXPORT_SYMBOL_GPL(anon_inode_getfile);
 
+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);
+}
+EXPORT_SYMBOL_GPL(anon_inode_getfile_secure);
+
 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,
-- 
2.31.1