Re: [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer

On Wed, 27 Jun 2018 17:59:00 -0700 Vishwath Mohan [off-list ref] wrote:

quoted

quoted

quoted

time consume much less memory, trading that off for somewhat imprecise
bug detection and being supported only for arm64.

Why do we consider this to be a worthwhile change?

Is KASAN's memory consumption actually a significant problem?  Some
data regarding that would be very useful.

On mobile, ASAN's and KASAN's memory usage is a significant problem.
Not sure if I can find scientific evidence of that.
CC-ing Vishwath Mohan who deals with KASAN on Android to provide
anecdotal evidence.

Yeah, I can confirm that it's an issue. Like Kostya mentioned, I don't have
data on-hand, but anecdotally both ASAN and KASAN have proven problematic
to enable for environments that don't tolerate the increased memory
pressure well. This includes,
(a) Low-memory form factors - Wear, TV, Things, lower-tier phones like Go
(c) Connected components like Pixel's visual core
<https://www.blog.google/products/pixel/pixel-visual-core-image-processing-and-machine-learning-pixel-2/>


These are both places I'd love to have a low(er) memory footprint option at
my disposal.

Thanks.

It really is important that such information be captured in the
changelogs.  In as much detail as can be mustered.

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