afs: Fix the maximum cell name length

Commit Message

David Howells Jan. 6, 2025, 4:21 p.m. UTC

The kafs filesystem limits the maximum length of a cell to 256 bytes, but a
problem occurs if someone actually does that: kafs tries to create a
directory under /proc/net/afs/ with the name of the cell, but that fails
with a warning:

        WARNING: CPU: 0 PID: 9 at fs/proc/generic.c:405

because procfs limits the maximum filename length to 255.

However, the DNS limits the maximum lookup length and, by extension, the
maximum cell name, to 255 less two (length count and trailing NUL).

Fix this by limiting the maximum acceptable cellname length to 253.  This
also allows us to be sure we can create the "/afs/.<cell>/" mountpoint too.

Further, split the YFS VL record cell name maximum to be the 256 allowed by
the protocol and ignore the record retrieved by YFSVL.GetCellName if it
exceeds 253.

Fixes: c3e9f888263b ("afs: Implement client support for the YFSVL.GetCellName RPC op")
Reported-by: [e-mail]
Closes: https://lore.kernel.org/r/[e-mail]/
Signed-off-by: David Howells <[e-mail]>
Tested-by: [e-mail]
cc: Marc Dionne <[e-mail]>
cc: [e-mail]
---
 fs/afs/afs.h      |    2 +-
 fs/afs/afs_vl.h   |    1 +
 fs/afs/vl_alias.c |    8 ++++++--
 fs/afs/vlclient.c |    2 +-
 4 files changed, 9 insertions(+), 4 deletions(-)

Comments

Christian Brauner Jan. 7, 2025, 2:55 p.m. UTC | #1

On Mon, 06 Jan 2025 16:21:00 +0000, David Howells wrote:
> The kafs filesystem limits the maximum length of a cell to 256 bytes, but a
> problem occurs if someone actually does that: kafs tries to create a
> directory under /proc/net/afs/ with the name of the cell, but that fails
> with a warning:
> 
>         WARNING: CPU: 0 PID: 9 at fs/proc/generic.c:405
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] afs: Fix the maximum cell name length
      https://git.kernel.org/vfs/vfs/c/8fd56ad6e7c9

Patch

diff --git a/fs/afs/afs.h b/fs/afs/afs.h
index b488072aee87..ec3db00bd081 100644
--- a/fs/afs/afs.h
+++ b/fs/afs/afs.h
@@ -10,7 +10,7 @@ 
 
 #include <linux/in.h>
 
-#define AFS_MAXCELLNAME		256  	/* Maximum length of a cell name */
+#define AFS_MAXCELLNAME		253  	/* Maximum length of a cell name (DNS limited) */
 #define AFS_MAXVOLNAME		64  	/* Maximum length of a volume name */
 #define AFS_MAXNSERVERS		8   	/* Maximum servers in a basic volume record */
 #define AFS_NMAXNSERVERS	13  	/* Maximum servers in a N/U-class volume record */
diff --git a/fs/afs/afs_vl.h b/fs/afs/afs_vl.h
index a06296c8827d..b835e25a2c02 100644
--- a/fs/afs/afs_vl.h
+++ b/fs/afs/afs_vl.h
@@ -13,6 +13,7 @@ 
 #define AFS_VL_PORT		7003	/* volume location service port */
 #define VL_SERVICE		52	/* RxRPC service ID for the Volume Location service */
 #define YFS_VL_SERVICE		2503	/* Service ID for AuriStor upgraded VL service */
+#define YFS_VL_MAXCELLNAME	256  	/* Maximum length of a cell name in YFS protocol */
 
 enum AFSVL_Operations {
 	VLGETENTRYBYID		= 503,	/* AFS Get VLDB entry by ID */
diff --git a/fs/afs/vl_alias.c b/fs/afs/vl_alias.c
index 9f36e14f1c2d..f9e76b604f31 100644
--- a/fs/afs/vl_alias.c
+++ b/fs/afs/vl_alias.c
@@ -253,6 +253,7 @@  static char *afs_vl_get_cell_name(struct afs_cell *cell, struct key *key)
 static int yfs_check_canonical_cell_name(struct afs_cell *cell, struct key *key)
 {
 	struct afs_cell *master;
+	size_t name_len;
 	char *cell_name;
 
 	cell_name = afs_vl_get_cell_name(cell, key);
@@ -264,8 +265,11 @@  static int yfs_check_canonical_cell_name(struct afs_cell *cell, struct key *key)
 		return 0;
 	}
 
-	master = afs_lookup_cell(cell->net, cell_name, strlen(cell_name),
-				 NULL, false);
+	name_len = strlen(cell_name);
+	if (!name_len || name_len > AFS_MAXCELLNAME)
+		master = ERR_PTR(-EOPNOTSUPP);
+	else
+		master = afs_lookup_cell(cell->net, cell_name, name_len, NULL, false);
 	kfree(cell_name);
 	if (IS_ERR(master))
 		return PTR_ERR(master);
diff --git a/fs/afs/vlclient.c b/fs/afs/vlclient.c
index cac75f89b64a..55dd0fc5aad7 100644
--- a/fs/afs/vlclient.c
+++ b/fs/afs/vlclient.c
@@ -697,7 +697,7 @@  static int afs_deliver_yfsvl_get_cell_name(struct afs_call *call)
 			return ret;
 
 		namesz = ntohl(call->tmp);
-		if (namesz > AFS_MAXCELLNAME)
+		if (namesz > YFS_VL_MAXCELLNAME)
 			return afs_protocol_error(call, afs_eproto_cellname_len);
 		paddedsz = (namesz + 3) & ~3;
 		call->count = namesz;