linux-kernel - [RFC][PATCH v3a 08/11] fsverity: Completely disable signature verification if not requested

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Message-ID: <20220127184614.2837938-4-roberto.sassu@huawei.com>
Date:   Thu, 27 Jan 2022 19:46:12 +0100
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <linux-integrity@...r.kernel.org>
CC:     <zohar@...ux.ibm.com>, <ebiggers@...nel.org>,
        <stefanb@...ux.ibm.com>, <linux-fscrypt@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [RFC][PATCH v3a 08/11] fsverity: Completely disable signature verification if not requested

Currently, fsverity verifies the signature, if supplied, regardless of
whether signature verification is requested or not.

Completely disable signature verification, if not requested, so that other
users of fsverity can do their own verification without relying on the
fsverity-specific verification to work.

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 fs/verity/signature.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/verity/signature.c b/fs/verity/signature.c
index 143a530a8008..b45a2cea6c59 100644
--- a/fs/verity/signature.c
+++ b/fs/verity/signature.c
@@ -45,13 +45,13 @@ int fsverity_verify_signature(const struct fsverity_info *vi,
 	struct fsverity_formatted_digest *d;
 	int err;
 
-	if (sig_size == 0) {
-		if (fsverity_require_signatures) {
-			fsverity_err(inode,
-				     "require_signatures=1, rejecting unsigned file!");
-			return -EPERM;
-		}
+	if (!fsverity_require_signatures)
 		return 0;
+
+	if (sig_size == 0) {
+		fsverity_err(inode,
+			     "require_signatures=1, rejecting unsigned file!");
+		return -EPERM;
 	}
 
 	d = kzalloc(sizeof(*d) + hash_alg->digest_size, GFP_KERNEL);
-- 
2.32.0