On Wed, 27 Apr 2022 18:31:15 +0100, Mark Rutland wrote:

This is the vs I promised. Since Alexander wanted to look at this in
more detail (and since this is subtle and needs review), I'm assuming
that Kees will pick this up some time next week after that's happened,
if all goes well. :)

This series reworks the stackleak code and the associated LKDTM test.
The first patch fixes some latent issues on arm64, and the subsequent
patches improve the code to improve clarity and permit better code
generation. Patches 8-10 address some latent issues in the LKDTM test
and add more diagnostic output.

[...]

I fixed some small commit log typos, but otherwise this looks great. If
anything new comes up we can adjust it.

Applied to for-next/hardening, thanks!

[01/13] arm64: stackleak: fix current_top_of_stack()
        https://git.kernel.org/kees/c/4c849d27b729
[02/13] stackleak: move skip_erasing() check earlier
        https://git.kernel.org/kees/c/e98a7c56d73c
[03/13] stackleak: remove redundant check
        https://git.kernel.org/kees/c/e45d9f71deea
[04/13] stackleak: rework stack low bound handling
        https://git.kernel.org/kees/c/cbe7edb47d3c
[05/13] stackleak: clarify variable names
        https://git.kernel.org/kees/c/e9da2241ed85
[06/13] stackleak: rework stack high bound handling
        https://git.kernel.org/kees/c/cfef4372a4b7
[07/13] stackleak: rework poison scanning
        https://git.kernel.org/kees/c/ff5f6d37e5bc
[08/13] lkdtm/stackleak: avoid spurious failure
        https://git.kernel.org/kees/c/23fd893fa0d7
[09/13] lkdtm/stackleak: rework boundary management
        https://git.kernel.org/kees/c/f4cfacd92972
[10/13] lkdtm/stackleak: prevent unexpected stack usage
        https://git.kernel.org/kees/c/c393c0b98d75
[11/13] lkdtm/stackleak: check stack boundaries
        https://git.kernel.org/kees/c/b6bf5a354eca
[12/13] stackleak: add on/off stack variants
        https://git.kernel.org/kees/c/96c59349a56c
[13/13] arm64: entry: use stackleak_erase_on_task_stack()
        https://git.kernel.org/kees/c/d46ac904fd35

-- 
Kees Cook


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