audit: set the name_len in audit_inode for parent lookups

Currently, this gets set mostly by happenstance when we call into
audit_inode_child. While that might be a little more efficient, it seems
wrong. If the syscall ends up failing before audit_inode_child ever gets
called, then you'll have an audit_names record that shows the full path
but has the parent inode info attached.

Fix this by passing in a parent flag when we call audit_inode that gets
set to the value of LOOKUP_PARENT. We can then fix up the pathname for
the audit entry correctly from the get-go.

While we're at it, clean up the no-op macro for audit_inode in the
!CONFIG_AUDITSYSCALL case.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

8 files changed, 87 insertions, 34 deletions

diff --git a/fs/namei.c b/fs/namei.c
index a7ad35c66807..6a92d988573f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1973,7 +1973,7 @@ static int do_path_lookup(int dfd, const char *name,
                 retval = path_lookupat(dfd, name, flags | LOOKUP_REVAL, nd);
 
         if (likely(!retval))
-                audit_inode(name, nd->path.dentry);
+                audit_inode(name, nd->path.dentry, flags & LOOKUP_PARENT);
         return retval;
 }
 
@@ -2648,7 +2648,7 @@ static int do_last(struct nameidata *nd, struct path *path,
                 error = complete_walk(nd);
                 if (error)
                         return error;
-                audit_inode(pathname, nd->path.dentry);
+                audit_inode(pathname, nd->path.dentry, 0);
                 if (open_flag & O_CREAT) {
                         error = -EISDIR;
                         goto out;
@@ -2658,7 +2658,7 @@ static int do_last(struct nameidata *nd, struct path *path,
                 error = complete_walk(nd);
                 if (error)
                         return error;
-                audit_inode(pathname, dir);
+                audit_inode(pathname, dir, 0);
                 goto finish_open;
         }
 
@@ -2687,7 +2687,7 @@ static int do_last(struct nameidata *nd, struct path *path,
                 if (error)
                         return error;
 
-                audit_inode(pathname, dir);
+                audit_inode(pathname, dir, 0);
                 error = -EISDIR;
                 /* trailing slashes? */
                 if (nd->last.name[nd->last.len])
@@ -2717,7 +2717,7 @@ retry_lookup:
                     !S_ISREG(file->f_path.dentry->d_inode->i_mode))
                         will_truncate = false;
 
-                audit_inode(pathname, file->f_path.dentry);
+                audit_inode(pathname, file->f_path.dentry, 0);
                 goto opened;
         }
 
@@ -2734,7 +2734,7 @@ retry_lookup:
          * create/update audit record if it already exists.
          */
         if (path->dentry->d_inode)
-                audit_inode(pathname, path->dentry);
+                audit_inode(pathname, path->dentry, 0);
 
         /*
          * If atomic_open() acquired write access it is dropped now due to
@@ -2799,7 +2799,7 @@ finish_lookup:
         error = -ENOTDIR;
         if ((nd->flags & LOOKUP_DIRECTORY) && !nd->inode->i_op->lookup)
                 goto out;
-        audit_inode(pathname, nd->path.dentry);
+        audit_inode(pathname, nd->path.dentry, 0);
 finish_open:
         if (!S_ISREG(nd->inode->i_mode))
                 will_truncate = false;
diff --git a/fs/open.c b/fs/open.c
index 44da0feeca2c..a015437e1535 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -478,7 +478,7 @@ SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode)
 
         file = fget(fd);
         if (file) {
-                audit_inode(NULL, file->f_path.dentry);
+                audit_inode(NULL, file->f_path.dentry, 0);
                 err = chmod_common(&file->f_path, mode);
                 fput(file);
         }
@@ -588,7 +588,7 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
         error = mnt_want_write_file(f.file);
         if (error)
                 goto out_fput;
-        audit_inode(NULL, f.file->f_path.dentry);
+        audit_inode(NULL, f.file->f_path.dentry, 0);
         error = chown_common(&f.file->f_path, user, group);
         mnt_drop_write_file(f.file);
 out_fput:
diff --git a/fs/xattr.c b/fs/xattr.c
index 1780f062dbaf..e164dddb8e96 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -412,7 +412,7 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
         if (!f.file)
                 return error;
         dentry = f.file->f_path.dentry;
-        audit_inode(NULL, dentry);
+        audit_inode(NULL, dentry, 0);
         error = mnt_want_write_file(f.file);
         if (!error) {
                 error = setxattr(dentry, name, value, size, flags);
@@ -507,7 +507,7 @@ SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
 
         if (!f.file)
                 return error;
-        audit_inode(NULL, f.file->f_path.dentry);
+        audit_inode(NULL, f.file->f_path.dentry, 0);
         error = getxattr(f.file->f_path.dentry, name, value, size);
         fdput(f);
         return error;
@@ -586,7 +586,7 @@ SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
 
         if (!f.file)
                 return error;
-        audit_inode(NULL, f.file->f_path.dentry);
+        audit_inode(NULL, f.file->f_path.dentry, 0);
         error = listxattr(f.file->f_path.dentry, list, size);
         fdput(f);
         return error;
@@ -655,7 +655,7 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
         if (!f.file)
                 return error;
         dentry = f.file->f_path.dentry;
-        audit_inode(NULL, dentry);
+        audit_inode(NULL, dentry, 0);
         error = mnt_want_write_file(f.file);
         if (!error) {
                 error = removexattr(dentry, name);
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 26408934ef2d..b11f517dce04 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -456,6 +456,7 @@ extern int audit_classify_arch(int arch);
 /* audit_names->type values */
 #define AUDIT_TYPE_UNKNOWN      0       /* we don't know yet */
 #define AUDIT_TYPE_NORMAL       1       /* a "normal" audit record */
+#define AUDIT_TYPE_PARENT       2       /* a parent audit record */
 
 #ifdef CONFIG_AUDITSYSCALL
 /* These are defined in auditsc.c */
@@ -468,7 +469,8 @@ extern void __audit_syscall_entry(int arch,
 extern void __audit_syscall_exit(int ret_success, long ret_value);
 extern void __audit_getname(const char *name);
 extern void audit_putname(const char *name);
-extern void __audit_inode(const char *name, const struct dentry *dentry);
+extern void __audit_inode(const char *name, const struct dentry *dentry,
+                                unsigned int parent);
 extern void __audit_inode_child(const struct inode *parent,
                                 const struct dentry *dentry);
 extern void __audit_seccomp(unsigned long syscall, long signr, int code);
@@ -505,9 +507,10 @@ static inline void audit_getname(const char *name)
         if (unlikely(!audit_dummy_context()))
                 __audit_getname(name);
 }
-static inline void audit_inode(const char *name, const struct dentry *dentry) {
+static inline void audit_inode(const char *name, const struct dentry *dentry,
+                                unsigned int parent) {
         if (unlikely(!audit_dummy_context()))
-                __audit_inode(name, dentry);
+                __audit_inode(name, dentry, parent);
 }
 static inline void audit_inode_child(const struct inode *parent,
                                      const struct dentry *dentry) {
@@ -660,12 +663,14 @@ static inline void audit_getname(const char *name)
 { }
 static inline void audit_putname(const char *name)
 { }
-static inline void __audit_inode(const char *name, const struct dentry *dentry)
+static inline void __audit_inode(const char *name, const struct dentry *dentry,
+                                        unsigned int parent)
 { }
 static inline void __audit_inode_child(const struct inode *parent,
                                         const struct dentry *dentry)
 { }
-static inline void audit_inode(const char *name, const struct dentry *dentry)
+static inline void audit_inode(const char *name, const struct dentry *dentry,
+                                unsigned int parent)
 { }
 static inline void audit_inode_child(const struct inode *parent,
                                      const struct dentry *dentry)
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 6b97e2466fad..9553ed006042 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -804,7 +804,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
 
         if (oflag & O_CREAT) {
                 if (path.dentry->d_inode) {     /* entry already exists */
-                        audit_inode(name, path.dentry);
+                        audit_inode(name, path.dentry, 0);
                         if (oflag & O_EXCL) {
                                 error = -EEXIST;
                                 goto out;
@@ -824,7 +824,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
                         error = -ENOENT;
                         goto out;
                 }
-                audit_inode(name, path.dentry);
+                audit_inode(name, path.dentry, 0);
                 filp = do_open(&path, oflag);
         }
 
@@ -978,7 +978,7 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
                 goto out_fput;
         }
         info = MQUEUE_I(inode);
-        audit_inode(NULL, f.file->f_path.dentry);
+        audit_inode(NULL, f.file->f_path.dentry, 0);
 
         if (unlikely(!(f.file->f_mode & FMODE_WRITE))) {
                 ret = -EBADF;
@@ -1094,7 +1094,7 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
                 goto out_fput;
         }
         info = MQUEUE_I(inode);
-        audit_inode(NULL, f.file->f_path.dentry);
+        audit_inode(NULL, f.file->f_path.dentry, 0);
 
         if (unlikely(!(f.file->f_mode & FMODE_READ))) {
                 ret = -EBADF;
diff --git a/kernel/audit.h b/kernel/audit.h
index 9eb3d79482b6..163b9a5d9441 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -78,6 +78,7 @@ 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,
                                     int *dirlen);
 extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index c4bcdbaf4d4d..71bb13598df3 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1298,6 +1298,36 @@ int audit_gid_comparator(kgid_t left, u32 op, kgid_t right)
         }
 }
 
+/**
+ * parent_len - find the length of the parent portion of a pathname
+ * @path: pathname of which to determine length
+ */
+int parent_len(const char *path)
+{
+        int plen;
+        const char *p;
+
+        plen = strlen(path);
+
+        if (plen == 0)
+                return plen;
+
+        /* disregard trailing slashes */
+        p = path + plen - 1;
+        while ((*p == '/') && (p > path))
+                p--;
+
+        /* walk backward until we find the next slash or hit beginning */
+        while ((*p != '/') && (p > path))
+                p--;
+
+        /* did we find a slash? Then increment to include it in path */
+        if (*p == '/')
+                p++;
+
+        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,
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 19b232f86d70..b87b28947acc 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2135,13 +2135,13 @@ static void audit_copy_inode(struct audit_names *name, const struct dentry *dent
 }
 
 /**
- * audit_inode - store the inode and device from a lookup
+ * __audit_inode - store the inode and device from a lookup
  * @name: name being audited
  * @dentry: dentry being audited
- *
- * Called from fs/namei.c:path_lookup().
+ * @parent: does this dentry represent the parent?
  */
-void __audit_inode(const char *name, const struct dentry *dentry)
+void __audit_inode(const char *name, const struct dentry *dentry,
+                   unsigned int parent)
 {
         struct audit_context *context = current->audit_context;
         const struct inode *inode = dentry->d_inode;
@@ -2154,19 +2154,38 @@ void __audit_inode(const char *name, const struct dentry *dentry)
                 goto out_alloc;
 
         list_for_each_entry_reverse(n, &context->names_list, list) {
-                if (n->name == name)
-                        goto out;
+                /* does the name pointer match? */
+                if (n->name != name)
+                        continue;
+
+                /* match the correct record type */
+                if (parent) {
+                        if (n->type == AUDIT_TYPE_PARENT ||
+                            n->type == AUDIT_TYPE_UNKNOWN)
+                                goto out;
+                } else {
+                        if (n->type != AUDIT_TYPE_PARENT)
+                                goto out;
+                }
         }
 
 out_alloc:
-        /* unable to find the name from a previous getname() */
+        /* unable to find the name from a previous getname(). Allocate a new
+         * anonymous entry.
+         */
         n = audit_alloc_name(context, AUDIT_TYPE_NORMAL);
         if (!n)
                 return;
 out:
+        if (parent) {
+                n->name_len = n->name ? parent_len(n->name) : AUDIT_NAME_FULL;
+                n->type = AUDIT_TYPE_PARENT;
+        } else {
+                n->name_len = AUDIT_NAME_FULL;
+                n->type = AUDIT_TYPE_NORMAL;
+        }
         handle_path(dentry);
         audit_copy_inode(n, dentry, inode);
-        n->type = AUDIT_TYPE_NORMAL;
 }
 
 /**
@@ -2190,7 +2209,6 @@ void __audit_inode_child(const struct inode *parent,
         const struct inode *inode = dentry->d_inode;
         const char *dname = dentry->d_name.name;
         struct audit_names *n;
-        int dirlen = 0;
 
         if (!context->in_syscall)
                 return;
@@ -2204,8 +2222,7 @@ void __audit_inode_child(const struct inode *parent,
                         continue;
 
                 if (n->ino == parent->i_ino &&
-                    !audit_compare_dname_path(dname, n->name, &dirlen)) {
-                        n->name_len = dirlen; /* update parent data in place */
+                    !audit_compare_dname_path(dname, n->name, NULL)) {
                         found_parent = n->name;
                         goto add_names;
                 }
@@ -2218,7 +2235,7 @@ 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, &dirlen)) {
+                     !audit_compare_dname_path(dname, n->name, NULL)) {
                         if (inode)
                                 audit_copy_inode(n, dentry, inode);
                         else