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Message-ID: <202209160805.CA47B2D673@keescook> Date: Fri, 16 Sep 2022 08:09:16 -0700 From: Kees Cook <keescook@...omium.org> To: Matthew Wilcox <willy@...radead.org> Cc: Uladzislau Rezki <urezki@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, Yu Zhao <yuzhao@...gle.com>, dev@...-flo.net, linux-mm@...ck.org, linux-hardening@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, x86@...nel.org, linux-perf-users@...r.kernel.org, linux-arch@...r.kernel.org Subject: Re: [PATCH 3/3] usercopy: Add find_vmap_area_try() to avoid deadlocks On Fri, Sep 16, 2022 at 03:46:07PM +0100, Matthew Wilcox wrote: > On Fri, Sep 16, 2022 at 06:59:57AM -0700, Kees Cook wrote: > > The check_object_size() checks under CONFIG_HARDENED_USERCOPY need to be > > more defensive against running from interrupt context. Use a best-effort > > check for VMAP areas when running in interrupt context > > I had something more like this in mind: Yeah, I like -EAGAIN. I'd like to keep the interrupt test to choose lock vs trylock, otherwise it's trivial to bypass the hardening test by having all the other CPUs beating on the spinlock. Thanks! -Kees -- Kees Cook
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