[PATCH ghak109 V1] audit: link integrity evm_write_xattrs record to syscall event

From: Richard Guy Briggs <rgb@redhat.com>
To: linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	Linux-Audit Mailing List <linux-audit@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>
Cc: Paul Moore <paul@paul-moore.com>,
	sgrubb@redhat.com, omosnace@redhat.com, eparis@parisplace.org,
	serge@hallyn.com, zohar@linux.ibm.com, mjg59@google.com,
	Richard Guy Briggs <rgb@redhat.com>
Subject: [PATCH ghak109 V1] audit: link integrity evm_write_xattrs record to syscall event
Date: Sat, 16 Mar 2019 08:10:08 -0400	[thread overview]
Message-ID: <81d0122d14c4fbb3a2ad33d25fdf2dd001c7dcc7.1552737854.git.rgb@redhat.com> (raw)

In commit fa516b66a1bf ("EVM: Allow runtime modification of the set of
verified xattrs"), the call to audit_log_start() is missing a context to
link it to an audit event. Since this event is in user context, add
the process' syscall context to the record.

In addition, the orphaned keyword "locked" appears in the record.
Normalize this by changing it to "xattr=(locked)".

Please see the github issue
https://github.com/linux-audit/audit-kernel/issues/109

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 security/integrity/evm/evm_secfs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/security/integrity/evm/evm_secfs.c b/security/integrity/evm/evm_secfs.c
index 015aea8fdf1e..4171d174e9da 100644
--- a/security/integrity/evm/evm_secfs.c
+++ b/security/integrity/evm/evm_secfs.c
@@ -192,7 +192,8 @@ static ssize_t evm_write_xattrs(struct file *file, const char __user *buf,
 	if (count > XATTR_NAME_MAX)
 		return -E2BIG;
 
-	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_EVM_XATTR);
+	ab = audit_log_start(audit_context(), GFP_KERNEL,
+			     AUDIT_INTEGRITY_EVM_XATTR);
 	if (!ab)
 		return -ENOMEM;
 
@@ -222,7 +223,7 @@ static ssize_t evm_write_xattrs(struct file *file, const char __user *buf,
 		inode_lock(inode);
 		err = simple_setattr(evm_xattrs, &newattrs);
 		inode_unlock(inode);
-		audit_log_format(ab, "locked");
+		audit_log_format(ab, "xattr=(locked)");
 		if (!err)
 			err = count;
 		goto out;
-- 
1.8.3.1

