[PATCH] Collect more inode information during syscall processing.

This patch augments the collection of inode info during syscall
processing. It represents part of the functionality that was provided
by the auditfs patch included in RHEL4.

Specifically, it:

- Collects information for target inodes created or removed during
  syscalls.  Previous code only collects information for the target
  inode's parent.

- Adds the audit_inode() hook to syscalls that operate on a file
  descriptor (e.g. fchown), enabling audit to do inode filtering for
  these calls.

- Modifies filtering code to check audit context for either an inode #
  or a parent inode # matching a given rule.

- Modifies logging to provide inode # for both parent and child.

- Protect debug info from NULL audit_names.name.

[AV: folded a later typo fix from the same author]

Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 17 insertions, 1 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index fd65078e794a..739b954cb242 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -260,7 +260,20 @@ extern void audit_syscall_entry(struct task_struct *task, int arch,
 extern void audit_syscall_exit(struct task_struct *task, 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, unsigned flags);
+extern void __audit_inode_child(const char *dname, const struct inode *inode,
+                                unsigned long pino);
+static inline void audit_inode(const char *name, const struct inode *inode,
+                               unsigned flags) {
+        if (unlikely(current->audit_context))
+                __audit_inode(name, inode, flags);
+}
+static inline void audit_inode_child(const char *dname, 
+                                     const struct inode *inode, 
+                                     unsigned long pino) {
+        if (unlikely(current->audit_context))
+                __audit_inode_child(dname, inode, pino);
+}
 
                                 /* Private API (for audit.c only) */
 extern int  audit_receive_filter(int type, int pid, int uid, int seq,
@@ -283,7 +296,10 @@ extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
 #define audit_syscall_exit(t,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_child(d,i,p) do { ; } while (0)
 #define audit_inode(n,i,f) do { ; } while (0)
+#define audit_inode_child(d,i,p) do { ; } while (0)
 #define audit_receive_filter(t,p,u,s,d,l) ({ -EOPNOTSUPP; })
 #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
 #define audit_get_loginuid(c) ({ -1; })