On Fri, Jul 30, 2021 at 10:08:03AM -0700, Nick Desaulniers wrote:

On Fri, Jul 30, 2021 at 9:44 AM Kees Cook [off-list ref] wrote:

quoted

On Fri, Jul 30, 2021 at 12:00:54PM +0300, Dan Carpenter wrote:

quoted

On Fri, Jul 30, 2021 at 10:38:45AM +0200, David Sterba wrote:

quoted

Then is explicit memset the only reliable way accross all compiler
flavors and supported versions?

The = { } initializer works.  It's only when you start partially
initializing the struct that it doesn't initialize holes.

No, partial works. It's when you _fully_ initialize the struct where the
padding doesn't get initialized. *sob*

I'm pretty sure that this has more to do with whether or not the
compiler applies SROA then observes uses of the individual members or
not.

Ultimately, it's just not consistent, so thank goodness for
-ftrivial-auto-var-init=zero. :)

-- 
Kees Cook