On Wed, Oct 11, 2023 at 10:11:46AM +0200, Ingo Molnar wrote:
- Peter Zijlstra peterz@infradead.org wrote:
DPRINTK(ALT, "alt table %px, -> %px", start, end);
- /*
* In the case CONFIG_X86_5LEVEL=y, KASAN_SHADOW_START is defined using
* cpu_feature_enabled(X86_FEATURE_LA57) and is therefore patched here.
* During the process, KASAN becomes confused and triggers
because of partial LA57 convertion ..
Not all LA57 related sites are patched yet at this point, and KASAN sees a weird & broken mixture of LA48 and LA57 runtime semantics, right?
Ie. as far as KASAN is concerned, the LA48 -> LA57 behavioral switchover must be atomic, but during the kernel code patching process it isn't.
Yep, half-way through the patching it observes inconsistencies and goes WTF :-)