[PATCH 2/2] audit: block PERM fields being used with io_uring filtering

From: Richard Guy Briggs <rgb@redhat.com>
To: Paul Moore <paul@paul-moore.com>,
	linux-audit@redhat.com, io-uring@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org,
	Kumar Kartikeya Dwivedi <memxor@gmail.com>,
	Jens Axboe <axboe@kernel.dk>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Richard Guy Briggs <rgb@redhat.com>
Subject: [PATCH 2/2] audit: block PERM fields being used with io_uring filtering
Date: Mon, 31 May 2021 09:44:55 -0400	[thread overview]
Message-ID: <8d1435a4b5db9139cc8eebce633f14872dd3a007.1622467740.git.rgb@redhat.com> (raw)
In-Reply-To: <CAHC9VhTr_hw_RBPf5yGD16j-qV2tbjjPJkimMNNQZBHtrJDbuQ@mail.gmail.com>

The commit ("audit: add filtering for io_uring records") added support for
filtering io_uring operations.  The PERM field is invalid for io_uring
filtering, so block it.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 kernel/auditfilter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index bcdedfd1088c..d75acb014ccd 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -336,6 +336,10 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
 		if (entry->rule.listnr != AUDIT_FILTER_FS)
 			return -EINVAL;
 		break;
+	case AUDIT_PERM:
+		if (entry->rule.listnr == AUDIT_FILTER_URING_EXIT)
+			return -EINVAL;
+		break;
 	}
 
 	switch (entry->rule.listnr) {
-- 
2.27.0

