[PATCH] log more info for directory entry change events

When an audit event involves changes to a directory entry, include
a PATH record for the directory itself.  A few other notable changes:

    - fixed audit_inode_child() hooks in fsnotify_move()
    - removed unused flags arg from audit_inode()
    - added audit log routines for logging a portion of a string

Here's some sample output.

before patch:
type=SYSCALL msg=audit(1149821605.320:26): arch=40000003 syscall=39 success=yes exit=0 a0=bf8d3c7c a1=1ff a2=804e1b8 a3=bf8d3c7c items=1 ppid=739 pid=800 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=ttyS0 comm="mkdir" exe="/bin/mkdir" subj=root:system_r:unconfined_t:s0-s0:c0.c255
type=CWD msg=audit(1149821605.320:26):  cwd="/root"
type=PATH msg=audit(1149821605.320:26): item=0 name="foo" parent=164068 inode=164010 dev=03:00 mode=040755 ouid=0 ogid=0 rdev=00:00 obj=root:object_r:user_home_t:s0

after patch:
type=SYSCALL msg=audit(1149822032.332:24): arch=40000003 syscall=39 success=yes exit=0 a0=bfdd9c7c a1=1ff a2=804e1b8 a3=bfdd9c7c items=2 ppid=714 pid=777 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=ttyS0 comm="mkdir" exe="/bin/mkdir" subj=root:system_r:unconfined_t:s0-s0:c0.c255
type=CWD msg=audit(1149822032.332:24):  cwd="/root"
type=PATH msg=audit(1149822032.332:24): item=0 name="/root" inode=164068 dev=03:00 mode=040750 ouid=0 ogid=0 rdev=00:00 obj=root:object_r:user_home_dir_t:s0
type=PATH msg=audit(1149822032.332:24): item=1 name="foo" inode=164010 dev=03:00 mode=040755 ouid=0 ogid=0 rdev=00:00 obj=root:object_r:user_home_t:s0

Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 10 insertions, 8 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index c78327507f4e..e1c1dbdf9efb 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -310,7 +310,7 @@ extern void audit_syscall_entry(int arch,
 extern void audit_syscall_exit(int failed, long return_code);
 extern void __audit_getname(const char *name);
 extern void audit_putname(const char *name);
-extern void __audit_inode(const char *name, const struct inode *inode, unsigned flags);
+extern void __audit_inode(const char *name, const struct inode *inode);
 extern void __audit_inode_child(const char *dname, const struct inode *inode,
                                 unsigned long pino);
 static inline void audit_getname(const char *name)
@@ -318,10 +318,9 @@ static inline void audit_getname(const char *name)
         if (unlikely(current->audit_context))
                 __audit_getname(name);
 }
-static inline void audit_inode(const char *name, const struct inode *inode,
-                               unsigned flags) {
+static inline void audit_inode(const char *name, const struct inode *inode) {
         if (unlikely(current->audit_context))
-                __audit_inode(name, inode, flags);
+                __audit_inode(name, inode);
 }
 static inline void audit_inode_child(const char *dname, 
                                      const struct inode *inode, 
@@ -398,9 +397,9 @@ static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 #define audit_syscall_exit(f,r) do { ; } while (0)
 #define audit_getname(n) do { ; } while (0)
 #define audit_putname(n) do { ; } while (0)
-#define __audit_inode(n,i,f) do { ; } while (0)
+#define __audit_inode(n,i) do { ; } while (0)
 #define __audit_inode_child(d,i,p) do { ; } while (0)
-#define audit_inode(n,i,f) do { ; } while (0)
+#define audit_inode(n,i) do { ; } while (0)
 #define audit_inode_child(d,i,p) do { ; } while (0)
 #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
 #define audit_get_loginuid(c) ({ -1; })
@@ -435,6 +434,9 @@ extern void		    audit_log_hex(struct audit_buffer *ab,
                                           size_t len);
 extern const char *         audit_log_untrustedstring(struct audit_buffer *ab,
                                                       const char *string);
+extern const char *         audit_log_n_untrustedstring(struct audit_buffer *ab,
+                                                        size_t n,
+                                                        const char *string);
 extern void                 audit_log_d_path(struct audit_buffer *ab,
                                              const char *prefix,
                                              struct dentry *dentry,
@@ -452,6 +454,7 @@ extern int  audit_receive_filter(int type, int pid, int uid, int seq,
 #define audit_log_end(b) do { ; } while (0)
 #define audit_log_hex(a,b,l) do { ; } while (0)
 #define audit_log_untrustedstring(a,s) do { ; } while (0)
+#define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
 #define audit_log_d_path(b,p,d,v) do { ; } while (0)
 #endif
 #endif
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index a9d30442448f..cc5dec70c32c 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -67,8 +67,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
         if (source) {
                 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
         }
-        audit_inode_child(old_name, source, old_dir->i_ino);
-        audit_inode_child(new_name, target, new_dir->i_ino);
+        audit_inode_child(new_name, source, new_dir->i_ino);
 }
 
 /*