This is a note to let you know that I've just added the patch titled
fsverity: skip PKCS#7 parser when keyring is empty
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fsverity-skip-pkcs-7-parser-when-keyring-is-empty.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 919dc320956ea353a7fb2d84265195ad5ef525ac Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Tue, 1 Aug 2023 21:03:53 -0700
Subject: fsverity: skip PKCS#7 parser when keyring is empty
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit 919dc320956ea353a7fb2d84265195ad5ef525ac upstream.
If an fsverity builtin signature is given for a file but the
".fs-verity" keyring is empty, there's no real reason to run the PKCS#7
parser. Skip this to avoid the PKCS#7 attack surface when builtin
signature support is configured into the kernel but is not being used.
This is a hardening improvement, not a fix per se, but I've added
Fixes and Cc stable to get it out to more users.
Fixes: 432434c9f8e1 ("fs-verity: support builtin file signatures")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230820173237.2579-1-ebiggers@xxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/verity/signature.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/fs/verity/signature.c
+++ b/fs/verity/signature.c
@@ -54,6 +54,22 @@ int fsverity_verify_signature(const stru
return 0;
}
+ if (fsverity_keyring->keys.nr_leaves_on_tree == 0) {
+ /*
+ * The ".fs-verity" keyring is empty, due to builtin signatures
+ * being supported by the kernel but not actually being used.
+ * In this case, verify_pkcs7_signature() would always return an
+ * error, usually ENOKEY. It could also be EBADMSG if the
+ * PKCS#7 is malformed, but that isn't very important to
+ * distinguish. So, just skip to ENOKEY to avoid the attack
+ * surface of the PKCS#7 parser, which would otherwise be
+ * reachable by any task able to execute FS_IOC_ENABLE_VERITY.
+ */
+ fsverity_err(inode,
+ "fs-verity keyring is empty, rejecting signed file!");
+ return -ENOKEY;
+ }
+
d = kzalloc(sizeof(*d) + hash_alg->digest_size, GFP_KERNEL);
if (!d)
return -ENOMEM;
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-6.4/fsverity-skip-pkcs-7-parser-when-keyring-is-empty.patch
