Re: KASAN: use-after-free Read in path_lookupat

From: Al Viro
Date: Mon Mar 25 2019 - 21:45:59 EST

On Mon, Mar 25, 2019 at 11:37:32PM +0000, Al Viro wrote:

> For debugfs it's clearly "use default ->evict_inode(), have explicit
> ->destroy_inode() using free_inode_nonrcu()" - there we have nothing
> else done in ->evict_inode() and kfree is obviously safe in softirq.
> I'll post that (or push to vfs.git#fixes), along with minimal fixes
> for other 3. If bpf_any_put() is softirq-safe, we'll have the full
> set for -stable and the rest could be done on top of that.
> Won't solve the documetation problem, unfortunately ;-/

Posted; all of those (as well as Daniel's bpf patch) are Cc:stable
fodder. Documentation is still, er, deficient...