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Date: Sun, 11 Sep 2022 16:42:34 -0400 From: Pasha Tatashin <pasha.tatashin@...een.com> To: Matthew Wilcox <willy@...radead.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Jonathan Corbet <corbet@....net>, linux-mm <linux-mm@...ck.org>, Linux Doc Mailing List <linux-doc@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Rick Edgecombe <rick.p.edgecombe@...el.com> Subject: Re: [PATCH 2/3] mm/page_table_check: Do WARN_ON instead of BUG_ON by default On Sun, Sep 11, 2022 at 12:08 PM Matthew Wilcox <willy@...radead.org> wrote: > > On Sun, Sep 11, 2022 at 09:59:22AM +0000, Pasha Tatashin wrote: > > Currently, page_table_check when detects errors panics kernel. Instead, > > print a warning, and panic only when specifically requested via kernel > > parameter: > > > > page_table_check=panic > > Why are the page table checks so special that they deserve their own > command line parameter? Why shouldn't this be controlled by the usual > panic_on_warn option? page_table_check can be used as a security feature preventing false page sharing between address spaces. For example, at Google we want it to keep enabled on production systems, yet we do not want to enable panic_on_warn as it would cause panics for many other reasons which are security unrelated. Pasha
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