audit: ignore fcaps on umount
Don't fetch fcaps when umount2 is called to avoid a process hang while
it waits for the missing resource to (possibly never) re-appear.
Note the comment above user_path_mountpoint_at():
* A umount is a special case for path walking. We're not actually interested
* in the inode in this situation, and ESTALE errors can be a problem. We
* simply want track down the dentry and vfsmount attached at the mountpoint
* and avoid revalidating the last component.
This can happen on ceph, cifs, 9p, lustre, fuse (gluster) or NFS.
Please see the github issue tracker
https://github.com/linux-audit/audit-kernel/issues/100
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
[PM: merge fuzz in audit_log_fcaps()]
Signed-off-by: Paul Moore <paul@paul-moore.com>
diff --git a/include/linux/audit.h b/include/linux/audit.h
index ecb5d31..29251b1 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/ptrace.h>
+#include <linux/namei.h> /* LOOKUP_* */
#include <uapi/linux/audit.h>
#define AUDIT_INO_UNSET ((unsigned long)-1)
@@ -248,6 +249,7 @@
#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
+#define AUDIT_INODE_NOEVAL 4 /* audit record incomplete */
extern void __audit_inode(struct filename *name, const struct dentry *dentry,
unsigned int flags);
extern void __audit_file(const struct file *);
@@ -308,12 +310,15 @@
}
static inline void audit_inode(struct filename *name,
const struct dentry *dentry,
- unsigned int parent) {
+ unsigned int flags) {
if (unlikely(!audit_dummy_context())) {
- unsigned int flags = 0;
- if (parent)
- flags |= AUDIT_INODE_PARENT;
- __audit_inode(name, dentry, flags);
+ unsigned int aflags = 0;
+
+ if (flags & LOOKUP_PARENT)
+ aflags |= AUDIT_INODE_PARENT;
+ if (flags & LOOKUP_NO_EVAL)
+ aflags |= AUDIT_INODE_NOEVAL;
+ __audit_inode(name, dentry, aflags);
}
}
static inline void audit_file(struct file *file)