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Wed, 11 Nov 2020 08:20:57 -0800 (PST) Date: Wed, 11 Nov 2020 17:20:51 +0100 From: Marco Elver To: Andrey Konovalov Cc: Dmitry Vyukov , Alexander Potapenko , Catalin Marinas , Will Deacon , Vincenzo Frascino , Evgenii Stepanov , Andrey Ryabinin , Branislav Rankov , Kevin Brodsky , Andrew Morton , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 05/20] kasan: allow VMAP_STACK for HW_TAGS mode Message-ID: <20201111162051.GG517454@elver.google.com> References: <3443e106c40799e5dc3981dec2011379f3cbbb0c.1605046662.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3443e106c40799e5dc3981dec2011379f3cbbb0c.1605046662.git.andreyknvl@google.com> User-Agent: Mutt/1.14.6 (2020-07-11) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Nov 10, 2020 at 11:20PM +0100, Andrey Konovalov wrote: > Even though hardware tag-based mode currently doesn't support checking > vmalloc allocations, it doesn't use shadow memory and works with > VMAP_STACK as is. Change VMAP_STACK definition accordingly. > > Signed-off-by: Andrey Konovalov > Link: https://linux-review.googlesource.com/id/I3552cbc12321dec82cd7372676e9372a2eb452ac > --- Shouldn't this be in the other series? FWIW, Reviewed-by: Marco Elver > arch/Kconfig | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/arch/Kconfig b/arch/Kconfig > index 56b6ccc0e32d..7e7d14fae568 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -914,16 +914,16 @@ config VMAP_STACK > default y > bool "Use a virtually-mapped stack" > depends on HAVE_ARCH_VMAP_STACK > - depends on !KASAN || KASAN_VMALLOC > + depends on !KASAN || KASAN_HW_TAGS || KASAN_VMALLOC > help > Enable this if you want the use virtually-mapped kernel stacks > with guard pages. This causes kernel stack overflows to be > caught immediately rather than causing difficult-to-diagnose > corruption. > > - To use this with KASAN, the architecture must support backing > - virtual mappings with real shadow memory, and KASAN_VMALLOC must > - be enabled. > + To use this with software KASAN modes, the architecture must support > + backing virtual mappings with real shadow memory, and KASAN_VMALLOC > + must be enabled. > > config ARCH_OPTIONAL_KERNEL_RWX > def_bool n > -- > 2.29.2.222.g5d2a92d10f8-goog >