[PATCH v4 0/9] audit: overhaul audit_names handling to allow for retrying on path-based syscalls

I recently posted a set of patches to have the kernel retry the lookup and call when path-based syscalls would ordinarily return ESTALE. Al took a look and pointed out that this would break the fragile logic that handles the audit_names for syscall auditing. This patchset comprises a number of incremental changes that should make it ok to retry on a path-based syscall. The main caveat is that the retry mustn't redo the getname() on the strings involved. Unfortunately, we don't have anything that really describes what the correct behavior is for this stuff, so I'm shooting here for "no discernable difference" on a retry. This seems to do the right thing in the cases that I've tested; mostly the normal case where things succeed or fail for some reason and where the syscall is retried after an ESTALE error. Review is of course appreciated. There are some fixes in here too for some subtle bugs in the existing code. Some of these patches may also help performance in some cases, but I haven't measured it for that. I'd like to see this patchset go into 3.6 if at all possible. Eric Paris (1): audit: make audit_compare_dname_path use parent_len helper Jeff Layton (8): audit: remove unnecessary NULL ptr checks from do_path_lookup audit: pass in dentry to audit_copy_inode wherever possible audit: reverse arguments to audit_inode_child audit: add a new "type" field to audit_names struct audit: set the name_len in audit_inode for parent lookups audit: remove dirlen argument to audit_compare_dname_path audit: optimize audit_compare_dname_path audit: overhaul __audit_inode_child to accomodate retrying fs/btrfs/ioctl.c | 2 +- fs/namei.c | 20 +++----- fs/open.c | 4 +- fs/xattr.c | 8 ++-- include/linux/audit.h | 36 ++++++++++----- include/linux/fsnotify.h | 8 ++-- ipc/mqueue.c | 8 ++-- kernel/audit.h | 7 ++- kernel/audit_watch.c | 3 +- kernel/auditfilter.c | 65 +++++++++++++++++--------- kernel/auditsc.c | 115 +++++++++++++++++++++++++++------------------ 11 files changed, 165 insertions(+), 111 deletions(-) -- 1.7.7.6