On Fri, Nov 19, 2021 at 01:35:22PM +0100, Greg Kroah-Hartman wrote:

On Mon, Nov 15, 2021 at 11:39:18AM -0700, Nathan Chancellor wrote:

...

Hi Greg and Sasha,

There is a build error with newer versions of clang due to a broken FORTIFY_SOURCE implementation, which has never worked:

https://github.com/ClangBuiltLinux/linux/issues/1496 https://github.com/ClangBuiltLinux/continuous-integration2/actions/runs/1457...

Please apply upstream commit a52f8a59aef4 ("fortify: Explicitly disable Clang support") to 5.15 through 4.19 to resolve this. It should apply cleanly.

Hah! Oh the Android people are going to _LOVE_ this one...

They (we) are already aware[1]. Fortify has always been broken under Clang, so really this doesn't change anything for Android builds. :P

But yes, one of many motivations of the recent memcpy and fortify work has been to get fortify fixed for Clang. Hopefully this will be all done by 5.17.

-Kees

[1] https://github.com/KSPP/linux/issues/77