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From: Paul Moore <pmoore@redhat.com>
To: linux-fsdevel@vger.kernel.org, linux-audit@redhat.com
Cc: rgb@redhat.com, sd@queasysnail.net, linux-kernel@vger.kernel.org,
	linux@roeck-us.net, viro@zeniv.linux.org.uk
Subject: [PATCH v2 4/5] audit: fix filename matching in __audit_inode() and __audit_inode_child()
Date: Thu, 22 Jan 2015 00:00:16 -0500	[thread overview]
Message-ID: <20150122050016.1347.17253.stgit@localhost> (raw)
In-Reply-To: <20150122045303.1347.98054.stgit@localhost>

In all likelihood there were some subtle, and perhaps not so subtle,
bugs with filename matching in audit_inode() and audit_inode_child()
for some time, however, recent changes to the audit filename code have
definitely broken the filename matching code.  The breakage could
result in duplicate filenames in the audit log and other odd audit
record entries.  This patch fixes the filename matching code and
restores some sanity to the filename audit records.

CC: viro@zeniv.linux.org.uk
CC: linux-fsdevel@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>
---
 kernel/auditsc.c |   34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c967ffc..c54b5f0 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1846,6 +1846,7 @@ void __audit_inode(struct filename *name, const struct dentry *dentry,
 	/* The struct filename _must_ have a populated ->name */
 	BUG_ON(!name->name);
 #endif
+
 	/*
 	 * If we have a pointer to an audit_names entry already, then we can
 	 * just use it directly if the type is correct.
@@ -1863,7 +1864,17 @@ void __audit_inode(struct filename *name, const struct dentry *dentry,
 	}
 
 	list_for_each_entry_reverse(n, &context->names_list, list) {
-		if (!n->name || strcmp(n->name->name, name->name))
+		if (n->ino) {
+			/* valid inode number, use that for the comparison */
+			if (n->ino != inode->i_ino ||
+			    n->dev != inode->i_sb->s_dev)
+				continue;
+		} else if (n->name) {
+			/* inode number has not been set, check the name */
+			if (strcmp(n->name->name, name->name))
+				continue;
+		} else
+			/* no inode and no name (?!) ... this is odd ... */
 			continue;
 
 		/* match the correct record type */
@@ -1931,11 +1942,16 @@ void __audit_inode_child(const struct inode *parent,
 
 	/* look for a parent entry first */
 	list_for_each_entry(n, &context->names_list, list) {
-		if (!n->name || n->type != AUDIT_TYPE_PARENT)
+		if (!n->name ||
+		    (n->type != AUDIT_TYPE_PARENT &&
+		     n->type != AUDIT_TYPE_UNKNOWN))
 			continue;
 
-		if (n->ino == parent->i_ino &&
-		    !audit_compare_dname_path(dname, n->name->name, n->name_len)) {
+		if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
+		    !audit_compare_dname_path(dname,
+					      n->name->name, n->name_len)) {
+			if (n->type == AUDIT_TYPE_UNKNOWN)
+				n->type = AUDIT_TYPE_PARENT;
 			found_parent = n;
 			break;
 		}
@@ -1944,11 +1960,8 @@ void __audit_inode_child(const struct inode *parent,
 	/* is there a matching child entry? */
 	list_for_each_entry(n, &context->names_list, list) {
 		/* can only match entries that have a name */
-		if (!n->name || n->type != type)
-			continue;
-
-		/* if we found a parent, make sure this one is a child of it */
-		if (found_parent && (n->name != found_parent->name))
+		if (!n->name ||
+		    (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
 			continue;
 
 		if (!strcmp(dname, n->name->name) ||
@@ -1956,6 +1969,8 @@ void __audit_inode_child(const struct inode *parent,
 						found_parent ?
 						found_parent->name_len :
 						AUDIT_NAME_FULL)) {
+			if (n->type == AUDIT_TYPE_UNKNOWN)
+				n->type = type;
 			found_child = n;
 			break;
 		}
@@ -1984,6 +1999,7 @@ void __audit_inode_child(const struct inode *parent,
 			found_child->name_put = false;
 		}
 	}
+
 	if (inode)
 		audit_copy_inode(found_child, dentry, inode);
 	else


  parent reply	other threads:[~2015-01-22  5:00 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-22  4:59 [PATCH v2 0/5] Overhaul the audit filename handling Paul Moore
2015-01-22  4:59 ` [PATCH v2 1/5] fs: rework getname_kernel to handle up to PATH_MAX sized filenames Paul Moore
2015-01-22 15:53   ` Richard Guy Briggs
2015-01-22 16:56     ` Guenter Roeck
2015-01-22  5:00 ` [PATCH v2 2/5] fs: create proper filename objects using getname_kernel() Paul Moore
2015-01-22 15:54   ` Richard Guy Briggs
2015-01-22  5:00 ` [PATCH v2 3/5] audit: enable filename recording via getname_kernel() Paul Moore
2015-01-22  5:00 ` Paul Moore [this message]
2015-01-22 16:04   ` [PATCH v2 4/5] audit: fix filename matching in __audit_inode() and __audit_inode_child() Richard Guy Briggs
2015-01-22  5:00 ` [PATCH v2 5/5] audit: replace getname()/putname() hacks with reference counters Paul Moore
2015-01-22 16:09   ` Richard Guy Briggs
2015-01-22 16:24     ` Paul Moore
2015-01-22  5:36 ` [PATCH v2 0/5] Overhaul the audit filename handling Guenter Roeck
2015-01-22  7:54   ` Al Viro
2015-01-22 16:23     ` Paul Moore
2015-01-22 21:25       ` Paul Moore
2015-01-22 21:29         ` Al Viro
2015-01-22 21:40           ` Al Viro
2015-01-22 22:05             ` Paul Moore
2015-01-23  5:30             ` Al Viro
2015-01-23 16:15               ` Paul Moore
2015-01-24  9:03               ` Sedat Dilek
2015-01-24 22:54                 ` Stephen Rothwell
2015-01-26 15:52                 ` Paul Moore
2015-01-22 17:13     ` Guenter Roeck
2015-01-22 16:22   ` Paul Moore
2015-01-22 16:58     ` Guenter Roeck

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