[PATCH v2 08/10] audit: make audit_inode take getname_info

Jeff Layton
2012-09-20T14:23:39Z

Keep a pointer to the audit_names "slot" in getname_info.

Have all of the audit_inode callers pass a getname_info ponter to
audit_inode instead of a string pointer. If the aname field is already
populated, then we can skip walking the list altogether and just use it
directly.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/namei.c | 16 +++++++---------
include/linux/audit.h | 10 +++++-----
include/linux/fs.h | 6 ++++--
ipc/mqueue.c | 4 ++--
kernel/auditsc.c | 29 +++++++++++++++++++++++++----
5 files changed, 43 insertions(+), 22 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 599ac28..c8daee7 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2004,8 +2004,7 @@ static int ginfo_lookup(int dfd, struct getname_info *ginfo,
flags | LOOKUP_REVAL, nd);

if (likely(!retval))
- audit_inode(ginfo->name, nd->path.dentry,
- flags & LOOKUP_PARENT);
+ audit_inode(ginfo, nd->path.dentry, flags & LOOKUP_PARENT);
return retval;
}

@@ -2679,7 +2678,6 @@ static int do_last(struct nameidata *nd, struct path *path,
struct path save_parent = { .dentry = NULL, .mnt = NULL };
bool retried = false;
int error;
- const char *pathname = ginfo->name;

nd->flags &= ~LOOKUP_PARENT;
nd->flags |= op->intent;
@@ -2695,7 +2693,7 @@ static int do_last(struct nameidata *nd, struct path *path,
error = complete_walk(nd);
if (error)
return error;
- audit_inode(pathname, nd->path.dentry, 0);
+ audit_inode(ginfo, nd->path.dentry, 0);
if (open_flag & O_CREAT) {
error = -EISDIR;
goto out;
@@ -2705,7 +2703,7 @@ static int do_last(struct nameidata *nd, struct path *path,
error = complete_walk(nd);
if (error)
return error;
- audit_inode(pathname, dir, 0);
+ audit_inode(ginfo, dir, 0);
goto finish_open;
}

@@ -2734,7 +2732,7 @@ static int do_last(struct nameidata *nd, struct path *path,
if (error)
return error;

- audit_inode(pathname, dir, 0);
+ audit_inode(ginfo, dir, 0);
error = -EISDIR;
/* trailing slashes? */
if (nd->last.name[nd->last.len])
@@ -2764,7 +2762,7 @@ retry_lookup:
!S_ISREG(file->f_path.dentry->d_inode->i_mode))
will_truncate = false;

- audit_inode(pathname, file->f_path.dentry, 0);
+ audit_inode(ginfo, file->f_path.dentry, 0);
goto opened;
}

@@ -2781,7 +2779,7 @@ retry_lookup:
* create/update audit record if it already exists.
*/
if (path->dentry->d_inode)
- audit_inode(pathname, path->dentry, 0);
+ audit_inode(ginfo, path->dentry, 0);

/*
* If atomic_open() acquired write access it is dropped now due to
@@ -2846,7 +2844,7 @@ finish_lookup:
error = -ENOTDIR;
if ((nd->flags & LOOKUP_DIRECTORY) && !nd->inode->i_op->lookup)
goto out;
- audit_inode(pathname, nd->path.dentry, 0);
+ audit_inode(ginfo, nd->path.dentry, 0);
finish_open:
if (!S_ISREG(nd->inode->i_mode))
will_truncate = false;
diff --git a/include/linux/audit.h b/include/linux/audit.h
index ea58de3..481cf75 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -472,7 +472,7 @@ extern void __audit_syscall_exit(int ret_success, long ret_value);
extern struct getname_info *__audit_reusename(const __user char *uptr);
extern void __audit_getname(struct getname_info *ginfo);
extern void audit_putname(struct getname_info *ginfo);
-extern void __audit_inode(const char *name, const struct dentry *dentry,
+extern void __audit_inode(struct getname_info *ginfo, const struct dentry *dentry,
unsigned int parent);
extern void __audit_inode_child(const struct inode *parent,
const struct dentry *dentry,
@@ -517,10 +517,10 @@ static inline void audit_getname(struct getname_info *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(struct getname_info *ginfo, const struct dentry *dentry,
unsigned int parent) {
if (unlikely(!audit_dummy_context()))
- __audit_inode(name, dentry, parent);
+ __audit_inode(ginfo, dentry, parent);
}
static inline void audit_inode_child(const struct inode *parent,
const struct dentry *dentry,
@@ -652,9 +652,9 @@ extern int audit_signals;
#define audit_reusename(g) ({ NULL; })
#define audit_getname(n) do { ; } while (0)
#define audit_putname(n) do { ; } while (0)
-#define __audit_inode(n,d,p) do { ; } while (0)
+#define __audit_inode(g,d,p) do { ; } while (0)
#define __audit_inode_child(p,d) do { ; } while (0)
-#define audit_inode(n,d,p) do { ; } while (0)
+#define audit_inode(g,d,p) do { ; } while (0)
#define audit_inode_child(p,d,t) do { ; } while (0)
#define audit_core_dumps(i) do { ; } while (0)
#define audit_seccomp(i,s,c) do { ; } while (0)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a37b0c1..4ce38f2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2189,9 +2189,11 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
#endif /* CONFIG_FILE_LOCKING */

/* fs/open.c */
+struct audit_names;
struct getname_info {
- const char *name; /* pointer to actual string */
- const __user char *uptr; /* original userland pointer */
+ const char *name; /* pointer to actual string */
+ const __user char *uptr; /* original userland pointer */
+ struct audit_names *aname;
};

extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 2071a27..07d489e 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -805,7 +805,7 @@ 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->name, path.dentry, 0);
+ audit_inode(name, path.dentry, 0);
if (oflag & O_EXCL) {
error = -EEXIST;
goto out;
@@ -825,7 +825,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
error = -ENOENT;
goto out;
}
- audit_inode(name->name, path.dentry, 0);
+ audit_inode(name, path.dentry, 0);
filp = do_open(&path, oflag);
}

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 89974ca..92ef854 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2090,6 +2090,7 @@ void __audit_getname(struct getname_info *ginfo)
n->ginfo = ginfo;
n->name_len = AUDIT_NAME_FULL;
n->name_put = true;
+ ginfo->aname = n;

if (!context->pwd.dentry)
get_fs_pwd(current->fs, &context->pwd);
@@ -2176,11 +2177,11 @@ static void audit_copy_inode(struct audit_names *name, const struct dentry *dent

/**
* __audit_inode - store the inode and device from a lookup
- * @name: name being audited
+ * @ginfo: getname_info for name being audited
* @dentry: dentry being audited
* @parent: does this dentry represent the parent?
*/
-void __audit_inode(const char *name, const struct dentry *dentry,
+void __audit_inode(struct getname_info *ginfo, const struct dentry *dentry,
unsigned int parent)
{
struct audit_context *context = current->audit_context;
@@ -2190,12 +2191,32 @@ void __audit_inode(const char *name, const struct dentry *dentry,
if (!context->in_syscall)
return;

- if (!name)
+ if (!ginfo)
goto out_alloc;

+#if AUDIT_DEBUG
+ /* The getname_info _must_ have a populated ->name */
+ BUG_ON(!ginfo->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.
+ */
+ n = ginfo->aname;
+ if (n) {
+ if (parent) {
+ if (n->type == AUDIT_TYPE_PARENT ||
+ n->type == AUDIT_TYPE_UNKNOWN)
+ goto out;
+ } else {
+ if (n->type != AUDIT_TYPE_PARENT)
+ goto out;
+ }
+ }
+
list_for_each_entry_reverse(n, &context->names_list, list) {
/* does the name pointer match? */
- if (!n->ginfo || n->ginfo->name != name)
+ if (!n->ginfo || n->ginfo->name != ginfo->name)
continue;

/* match the correct record type */
--
1.7.11.4