linux-kernel - [PATCH v2 2/3] afs: Add rootcell checks

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Message-ID: <20250107183454.608451-3-dhowells@redhat.com>
Date: Tue,  7 Jan 2025 18:34:50 +0000
From: David Howells <dhowells@...hat.com>
To: Marc Dionne <marc.dionne@...istor.com>
Cc: David Howells <dhowells@...hat.com>,
	Christian Brauner <christian@...uner.io>,
	linux-afs@...ts.infradead.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] afs: Add rootcell checks

Add some checks for the validity of the cell name.  It's may get put into a
symlink, so preclude it containing any slashes or "..".  Also disallow
starting/ending with a dot.  This makes /afs/@...l/ as a symlink less of a
security risk.

Also disallow multiple setting of /proc/net/afs/rootcell for any given
network namespace.  Once set, the value may not be changed.  This makes it
easier to only create /afs/@...l and /afs/.@...l if there's a rootcell.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
---
 fs/afs/cell.c | 8 ++++++++
 fs/afs/proc.c | 8 +++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index 1aba6d4d03a9..cee42646736c 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -367,6 +367,14 @@ int afs_cell_init(struct afs_net *net, const char *rootcell)
 		len = cp - rootcell;
 	}
 
+	if (len == 0 || !rootcell[0] || rootcell[0] == '.' || rootcell[len - 1] == '.')
+		return -EINVAL;
+	if (memchr(rootcell, '/', len))
+		return -EINVAL;
+	cp = strstr(rootcell, "..");
+	if (cp && cp < rootcell + len)
+		return -EINVAL;
+
 	/* allocate a cell record for the root cell */
 	new_root = afs_lookup_cell(net, rootcell, len, vllist, false);
 	if (IS_ERR(new_root)) {
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 15eab053af6d..e7614f4f30c2 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -240,7 +240,13 @@ static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
 	/* determine command to perform */
 	_debug("rootcell=%s", buf);
 
-	ret = afs_cell_init(net, buf);
+	ret = -EEXIST;
+	inode_lock(file_inode(file));
+	if (!net->ws_cell)
+		ret = afs_cell_init(net, buf);
+	else
+		printk("busy\n");
+	inode_unlock(file_inode(file));
 
 out:
 	_leave(" = %d", ret);