On Thu, Mar 12, 2020 at 06:57:34PM +0530, Santosh Sivaraj wrote: > The TLB flush optimisation (a46cc7a90f: powerpc/mm/radix: Improve TLB/PWC > flushes) may result in random memory corruption. Any concurrent page-table walk > could end up with a Use-after-Free. Even on UP this might give issues, since > mmu_gather is preemptible these days. An interrupt or preempted task accessing > user pages might stumble into the free page if the hardware caches page > directories. > > The series is a backport of the fix sent by Peter [1]. > > The first three patches are dependencies for the last patch (avoid potential > double flush). If the performance impact due to double flush is considered > trivial then the first three patches and last patch may be dropped. > > This is only for v4.19 stable. > > [1] https://patchwork.kernel.org/cover/11284843/ Sorry for the delay, now queued up, let's see what the test-builders say about it... thanks, greg k-h
