[PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive()
joe at perches.com
Thu Jun 18 01:12:06 CEST 2020
On Thu, 2020-06-18 at 00:31 +0300, Denis Efremov wrote:
> On 6/16/20 9:53 PM, Joe Perches wrote:
> > On Mon, 2020-06-15 at 21:57 -0400, Waiman Long wrote:
> > > v4:
> > > - Break out the memzero_explicit() change as suggested by Dan Carpenter
> > > so that it can be backported to stable.
> > > - Drop the "crypto: Remove unnecessary memzero_explicit()" patch for
> > > now as there can be a bit more discussion on what is best. It will be
> > > introduced as a separate patch later on after this one is merged.
> > To this larger audience and last week without reply:
> > https://email@example.com/
> > Are there _any_ fastpath uses of kfree or vfree?
> > Many patches have been posted recently to fix mispairings
> > of specific types of alloc and free functions.
> I've prepared a coccinelle script to highlight these mispairings in a function
> a couple of days ago: https://lkml.org/lkml/2020/6/5/953
> I've listed all the fixes in the commit message.
> Not so many mispairings actually, and most of them are harmless like:
> kmalloc(E) -> kvfree(E)
> However, coccinelle script can't detect cross-functions mispairings, i.e.
> allocation in one function, free in another funtion.
Hey Denis, thanks for those patches.
If possible, it's probably better to not require these pairings
and use a single standard kfree/free function.
Given the existing ifs in kfree in slab/slob/slub, it seems
likely that adding a few more wouldn't have much impact.
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