linux-kernel - [RFC 04/11] crypto: pkcs7: add flag for validated trust on a signed info block

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Message-ID: <20251211021257.1208712-5-bboscaccy@linux.microsoft.com>
Date: Wed, 10 Dec 2025 18:11:59 -0800
From: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>
To: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>,
	Jonathan Corbet <corbet@....net>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Mickaël Salaün <mic@...ikod.net>,
	Günther Noack <gnoack@...gle.com>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James.Bottomley@...senPartnership.com,
	dhowells@...hat.com,
	linux-security-module@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [RFC 04/11] crypto: pkcs7: add flag for validated trust on a signed info block

From: James Bottomley <James.Bottomley@...senPartnership.com>

Allow consumers of struct pkcs7_message to tell if any of the sinfo
fields has passed a trust validation.  Note that this does not happen
in parsing, pkcs7_validate_trust() must be explicitly called or called
via validate_pkcs7_trust().

Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
---
 crypto/asymmetric_keys/pkcs7_parser.h | 1 +
 crypto/asymmetric_keys/pkcs7_trust.c  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/crypto/asymmetric_keys/pkcs7_parser.h b/crypto/asymmetric_keys/pkcs7_parser.h
index e17f7ce4fb434..344340cfa6c13 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.h
+++ b/crypto/asymmetric_keys/pkcs7_parser.h
@@ -20,6 +20,7 @@ struct pkcs7_signed_info {
 	unsigned	index;
 	bool		unsupported_crypto;	/* T if not usable due to missing crypto */
 	bool		blacklisted;
+	bool		verified; /* T if this signer has validated trust */
 
 	/* Message digest - the digest of the Content Data (or NULL) */
 	const void	*msgdigest;
diff --git a/crypto/asymmetric_keys/pkcs7_trust.c b/crypto/asymmetric_keys/pkcs7_trust.c
index 9a87c34ed1733..78ebfb6373b61 100644
--- a/crypto/asymmetric_keys/pkcs7_trust.c
+++ b/crypto/asymmetric_keys/pkcs7_trust.c
@@ -127,6 +127,7 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
 		for (p = sinfo->signer; p != x509; p = p->signer)
 			p->verified = true;
 	}
+	sinfo->verified = true;
 	kleave(" = 0");
 	return 0;
 }
-- 
2.52.0