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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id d20sm3796924pfn.219.2021.07.14.14.14.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jul 2021 14:14:05 -0700 (PDT) Date: Wed, 14 Jul 2021 14:14:04 -0700 From: Kees Cook To: bowsingbetee Cc: Sergei Trofimovich , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Alexander Potapenko , Thomas Gleixner , Vlastimil Babka Subject: Re: [PATCH] mm: page_alloc: fix page_poison=1 / INIT_ON_ALLOC_DEFAULT_ON interaction Message-ID: <202107141413.78A4ED77@keescook> References: <20210712005732.4f9bfa78@zn3> <20210712215816.1512739-1-slyfox@gentoo.org> <202107131953.BB3627156@keescook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 14, 2021 at 11:11:18AM +0000, bowsingbetee wrote: > B & C variants show this message and A does not, which is what I would expect to happen. > > Tested variants: > > A. "page_poison=1 init_on_free=0 init_on_alloc=0 slub_debug=P" > B. "page_poison=1 init_on_free=0 init_on_alloc=0 slub_debug=P init_on_free=1" > C. "page_poison=1 slub_debug=P" > > in common: > CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y > CONFIG_INIT_ON_FREE_DEFAULT_ON=y > CONFIG_PAGE_POISONING=y > CONFIG_SLUB_DEBUG=y > CONFIG_SLUB=y > > (the slub parts don't matter, ignore them) > > [...] > > While both patches(Sergei's, and yours) work for me, I'll be using this one for now. > > Thank you for your work! > Cheers! Awesome; thanks for testing it! -Kees -- Kees Cook