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authorPaul Moore <pmoore@redhat.com>2015-01-22 00:00:16 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-01-23 00:23:58 -0500
commit57c59f5837bdfd0b4fee3b02a44857e263a09bfa (patch)
tree3977c4bdd3271e3bc5210803d39eb4f11199ecf1 /kernel/auditsc.c
parentfd3522fdc84023b050bb40318d9fc71a9adc22bc (diff)
downloadlinux-sh-57c59f5837bdfd0b4fee3b02a44857e263a09bfa.tar.gz
audit: fix filename matching in __audit_inode() and __audit_inode_child()
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> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/auditsc.c')
-rw-r--r--kernel/auditsc.c34
1 files changed, 25 insertions, 9 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 132dbcdef6ec..4f521964ccaa 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 */
@@ -1936,11 +1947,16 @@ 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;
}
@@ -1949,11 +1965,8 @@ 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) ||
@@ -1961,6 +1974,8 @@ 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;
}
@@ -1989,6 +2004,7 @@ void __audit_inode_child(const struct inode *parent,
found_child->name_put = false;
}
}
+
if (inode)
audit_copy_inode(found_child, dentry, inode);
else