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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id q19-20020aa78433000000b00562f6df42f1sm3188707pfn.152.2022.10.28.13.19.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Oct 2022 13:19:01 -0700 (PDT) Date: Fri, 28 Oct 2022 13:19:00 -0700 From: Kees Cook To: Joey Gouly Cc: Catalin Marinas , Andrew Morton , Lennart Poettering , Zbigniew =?utf-8?Q?J=C4=99drzejewski-Szmek?= , Alexander Viro , Szabolcs Nagy , Mark Brown , Jeremy Linton , Topi Miettinen , linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-abi-devel@lists.sourceforge.net, nd@arm.com, shuah@kernel.org Subject: Re: [PATCH v1 2/2] kselftest: vm: add tests for memory-deny-write-execute Message-ID: <202210281316.C83D6B5649@keescook> References: <20221026150457.36957-1-joey.gouly@arm.com> <20221026150457.36957-3-joey.gouly@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221026150457.36957-3-joey.gouly@arm.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1666988343; a=rsa-sha256; cv=none; b=0edLXVYlFK0g51oawsuIfbES9dB4ZmyXJCeEzhX5X9xTKwk8sW8zqsW+O3pgxBXYG6bFil /FwyFAw+TTOPsiWDpn2J5ieRYhSTWoSkv0k0ZoSJgcyfNz/3mTqZ3VeTSOoX0UBv9sItBP OS5oeupta+2zZU8A3FbjPlsDN6Suh60= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=EovuOzEp; dmarc=pass (policy=none) header.from=chromium.org; spf=pass (imf03.hostedemail.com: domain of keescook@chromium.org designates 209.85.215.172 as permitted sender) smtp.mailfrom=keescook@chromium.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666988343; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=lr8ThsJDDzI0Z5jdVGHzAGzIMwhRINT2tmxbJxyxmp0=; b=Cn4Yz858PsYS6LLYHerxZHaZwxvYG6BWiSfVfK7Q3v6pOEbq3DiiA1SSQeIskct9Fpw2sy TLSImYkmdvsqv0QydTik7AC6wiP3WfdFtpEKit/OyEw3iu5lBg0NjkEqwAngdw7y/Y1JJR OlbgzRmGarUmhNlRvvVZ7KD33Jwa3Tw= X-Stat-Signature: h6979r4cgjj7ba7h4ckerqgagtg35a8r X-Rspamd-Queue-Id: 4D55820006 X-Rspam-User: Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=EovuOzEp; dmarc=pass (policy=none) header.from=chromium.org; spf=pass (imf03.hostedemail.com: domain of keescook@chromium.org designates 209.85.215.172 as permitted sender) smtp.mailfrom=keescook@chromium.org X-Rspamd-Server: rspam09 X-HE-Tag: 1666988343-33804 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 Wed, Oct 26, 2022 at 04:04:57PM +0100, Joey Gouly wrote: > [...] > +# define PR_MDWE_FLAG_MMAP 1 > [...] > + // Enable MDWE and then run the tests again. > + ret = prctl(PR_SET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0); > + if (ret < 0) { > + ksft_print_msg("PR_SET_MDWE failed or unsupported!\n"); > + goto exit; > + } > + > + ret = prctl(PR_GET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0); > + if (ret == 0) > + ksft_exit_fail_msg("PR_GET_MDWE failed!"); This flag (PR_MDWE_FLAG_MMAP), while defined in uapi, wasn't actually being used in the proposed prctl() api. :) -- Kees Cook