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Commit e3d6b07b authored by Jeff Layton's avatar Jeff Layton Committed by Al Viro
Browse files

audit: optimize audit_compare_dname_path 



In the cases where we already know the length of the parent, pass it as
a parm so we don't need to recompute it. In the cases where we don't
know the length, pass in AUDIT_NAME_FULL (-1) to indicate that it should
be determined.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 29e9a346

kernel/audit.h

+4 −1
Original line number Diff line number Diff line
@@ -74,12 +74,15 @@ static inline int audit_hash_ino(u32 ino) 
	return (ino & (AUDIT_INODE_BUCKETS-1));

}



/* Indicates that audit should log the full pathname. */

#define AUDIT_NAME_FULL -1



extern int audit_match_class(int class, unsigned syscall);

extern int audit_comparator(const u32 left, const u32 op, const u32 right);

extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);

extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);

extern int parent_len(const char *path);

extern int audit_compare_dname_path(const char *dname, const char *path);

extern int audit_compare_dname_path(const char *dname, const char *path, int plen);

extern struct sk_buff *	    audit_make_reply(int pid, int seq, int type,

					     int done, int multi,

					     const void *payload, int size);

kernel/audit_watch.c

+2 −1
Original line number Diff line number Diff line
@@ -265,7 +265,8 @@ static void audit_update_watch(struct audit_parent *parent, 
	/* Run all of the watches on this parent looking for the one that

	 * matches the given dname */

	list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {

		if (audit_compare_dname_path(dname, owatch->path))

		if (audit_compare_dname_path(dname, owatch->path,

					     AUDIT_NAME_FULL))

			continue;



		/* If the update involves invalidating rules, do the inode-based

kernel/auditfilter.c

+11 −5
Original line number Diff line number Diff line
@@ -1328,11 +1328,17 @@ int parent_len(const char *path) 
	return p - path;

}



/* Compare given dentry name with last component in given path,

 * return of 0 indicates a match. */

int audit_compare_dname_path(const char *dname, const char *path)

/**

 * audit_compare_dname_path - compare given dentry name with last component in

 * 			      given path. Return of 0 indicates a match.

 * @dname:	dentry name that we're comparing

 * @path:	full pathname that we're comparing

 * @parentlen:	length of the parent if known. Passing in AUDIT_NAME_FULL

 * 		here indicates that we must compute this value.

 */

int audit_compare_dname_path(const char *dname, const char *path, int parentlen)

{

	int dlen, pathlen, parentlen;

	int dlen, pathlen;

	const char *p;



	dlen = strlen(dname);
@@ -1340,7 +1346,7 @@ int audit_compare_dname_path(const char *dname, const char *path) 
	if (pathlen < dlen)

		return 1;



	parentlen = parent_len(path);

	parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;

	if (pathlen - parentlen != dlen)

		return 1;

kernel/auditsc.c

+3 −5
Original line number Diff line number Diff line
@@ -81,9 +81,6 @@ 
 * a name dynamically and also add those to the list anchored by names_list. */

#define AUDIT_NAMES	5



/* Indicates that audit should log the full pathname. */

#define AUDIT_NAME_FULL -1



/* no execve audit message should be longer than this (userspace limits) */

#define MAX_EXECVE_AUDIT_LEN 7500
@@ -2222,7 +2219,7 @@ void __audit_inode_child(const struct inode *parent, 
			continue;



		if (n->ino == parent->i_ino &&

		    !audit_compare_dname_path(dname, n->name)) {

		    !audit_compare_dname_path(dname, n->name, n->name_len)) {

			found_parent = n->name;

			goto add_names;

		}
@@ -2235,7 +2232,8 @@ void __audit_inode_child(const struct inode *parent, 


		/* strcmp() is the more likely scenario */

		if (!strcmp(dname, n->name) ||

		     !audit_compare_dname_path(dname, n->name)) {

		    !audit_compare_dname_path(dname, n->name,

						AUDIT_NAME_FULL)) {

			if (inode)

				audit_copy_inode(n, dentry, inode);

			else