From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9C7FC35DF7 for ; Tue, 25 Feb 2020 05:13:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AE5B624689 for ; Tue, 25 Feb 2020 05:13:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="FNMuINYq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728913AbgBYFNU (ORCPT ); Tue, 25 Feb 2020 00:13:20 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:43961 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726974AbgBYFNR (ORCPT ); Tue, 25 Feb 2020 00:13:17 -0500 Received: by mail-pg1-f193.google.com with SMTP id u12so6271811pgb.10 for ; Mon, 24 Feb 2020 21:13:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=KFgEd5ihB5mpYJHgTJ73YmLe+8HUk6ELkCILmCi0oOk=; b=FNMuINYqjkWcMKmsC54Bq/gTZBk8TfWE/kHSeHazPaZ6Qsgq4UEwtaKxNjx3U/LSOL lSxriB94mOtmP7ZumY1pLpyXNh1eiELD+deo2AfzoltvtXbJresnxC13IfnGI7/zF0u8 gfw7+zy+BpP4vi9hf0mYsgj0+sBmXM2UX7Dlk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=KFgEd5ihB5mpYJHgTJ73YmLe+8HUk6ELkCILmCi0oOk=; b=CmF0hHovJCU5yDRxBH0shhA3bbUbrDvNq609gTIRNveoQYla3WyYJYAJeu/wvk9k6j 61pXqQ0HMHv8m/Q3V5q1pMa+rGreVDohyc3VRgBSp79Cfutv3BR289BSk2cDcYM1V6ym LmkyANADzwDIox90tWGg9+O/yLxf5oeKoQ74tKZKXQC43FFmH4e1ntd5Nw+pA0CiCi5w ifZytMq3l5s9GyJHE5StIm4lfF67sjPEl9OccDeTgyawYT3znuv6ArTecfL4pRAYLkMp /Ucf/l2VEaeUEJiZmzZzhhpmS6bfehJDmvhwVS+zUYubNzwo0YJbMokK6987Sb4ZnmAl umWw== X-Gm-Message-State: APjAAAU+PVovzWzHP6LWONVYOyVw1crguRkIVjekVGC488ITLAcqLHkF 2ZroEYqTj/YJUBbt4NXnqO7EZvG3i/U= X-Google-Smtp-Source: APXvYqwchftXeveUuXJHknSGejturvoBpu91/DIibP3TqJfUAAo+U3HXFzD6DGyObdeKZ5MP3RURPQ== X-Received: by 2002:a63:5b54:: with SMTP id l20mr19043243pgm.324.1582607596247; Mon, 24 Feb 2020 21:13:16 -0800 (PST) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id j17sm14695804pfa.16.2020.02.24.21.13.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 21:13:15 -0800 (PST) From: Kees Cook To: Borislav Petkov Cc: Kees Cook , Hector Marco-Gisbert , Jason Gunthorpe , Catalin Marinas , Jason Gunthorpe , Russell King , Will Deacon , Jann Horn , x86@kernel.org, linux-arm-kernel@lists.infradead.org, kernel-hardening@lists.openwall.com, linux-kernel@vger.kernel.org Subject: [PATCH v4 6/6] arm64, elf: Disable automatic READ_IMPLIES_EXEC for 64-bit address spaces Date: Mon, 24 Feb 2020 21:13:07 -0800 Message-Id: <20200225051307.6401-7-keescook@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200225051307.6401-1-keescook@chromium.org> References: <20200225051307.6401-1-keescook@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With arm64 64-bit environments, there should never be a need for automatic READ_IMPLIES_EXEC, as the architecture has always been execute-bit aware (as in, the default memory protection should be NX unless a region explicitly requests to be executable). Suggested-by: Hector Marco-Gisbert Signed-off-by: Kees Cook Reviewed-by: Jason Gunthorpe Reviewed-by: Catalin Marinas --- arch/arm64/include/asm/elf.h | 4 ++-- fs/compat_binfmt_elf.c | 5 +++++ 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 03ada29984a7..ea9221ed68a1 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -105,7 +105,7 @@ *             CPU*: | arm32    | arm64 | * ELF:              |            |            | * -------------------------------|------------| - * missing GNU_STACK | exec-all   | exec-all   | + * missing GNU_STACK | exec-all   | exec-none  | * GNU_STACK == RWX  | exec-stack | exec-stack | * GNU_STACK == RW   | exec-none | exec-none | * @@ -117,7 +117,7 @@ * *all arm64 CPUs support NX, so there is no "lacks NX" column. * */ -#define elf_read_implies_exec(ex,stk) (stk == EXSTACK_DEFAULT) +#define compat_elf_read_implies_exec(ex, stk) (stk == EXSTACK_DEFAULT) #define CORE_DUMP_USE_REGSET #define ELF_EXEC_PAGESIZE PAGE_SIZE diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c index aaad4ca1217e..3068d57436b3 100644 --- a/fs/compat_binfmt_elf.c +++ b/fs/compat_binfmt_elf.c @@ -113,6 +113,11 @@ #define arch_setup_additional_pages compat_arch_setup_additional_pages #endif +#ifdef compat_elf_read_implies_exec +#undef elf_read_implies_exec +#define elf_read_implies_exec compat_elf_read_implies_exec +#endif + /* * Rename a few of the symbols that binfmt_elf.c will define. * These are all local so the names don't really matter, but it -- 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97118C35DF5 for ; 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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id j17sm14695804pfa.16.2020.02.24.21.13.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 21:13:15 -0800 (PST) From: Kees Cook To: Borislav Petkov Subject: [PATCH v4 6/6] arm64, elf: Disable automatic READ_IMPLIES_EXEC for 64-bit address spaces Date: Mon, 24 Feb 2020 21:13:07 -0800 Message-Id: <20200225051307.6401-7-keescook@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200225051307.6401-1-keescook@chromium.org> References: <20200225051307.6401-1-keescook@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200224_211316_728364_85E1EE5C X-CRM114-Status: GOOD ( 11.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kees Cook , Jann Horn , Catalin Marinas , x86@kernel.org, Hector Marco-Gisbert , Russell King , linux-kernel@vger.kernel.org, Jason Gunthorpe , Jason Gunthorpe , kernel-hardening@lists.openwall.com, Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org V2l0aCBhcm02NCA2NC1iaXQgZW52aXJvbm1lbnRzLCB0aGVyZSBzaG91bGQgbmV2ZXIgYmUgYSBu ZWVkIGZvciBhdXRvbWF0aWMKUkVBRF9JTVBMSUVTX0VYRUMsIGFzIHRoZSBhcmNoaXRlY3R1cmUg aGFzIGFsd2F5cyBiZWVuIGV4ZWN1dGUtYml0IGF3YXJlCihhcyBpbiwgdGhlIGRlZmF1bHQgbWVt b3J5IHByb3RlY3Rpb24gc2hvdWxkIGJlIE5YIHVubGVzcyBhIHJlZ2lvbgpleHBsaWNpdGx5IHJl cXVlc3RzIHRvIGJlIGV4ZWN1dGFibGUpLgoKU3VnZ2VzdGVkLWJ5OiBIZWN0b3IgTWFyY28tR2lz YmVydCA8aGVjbWFyZ2lAdXB2LmVzPgpTaWduZWQtb2ZmLWJ5OiBLZWVzIENvb2sgPGtlZXNjb29r QGNocm9taXVtLm9yZz4KUmV2aWV3ZWQtYnk6IEphc29uIEd1bnRob3JwZSA8amdnQG1lbGxhbm94 LmNvbT4KUmV2aWV3ZWQtYnk6IENhdGFsaW4gTWFyaW5hcyA8Y2F0YWxpbi5tYXJpbmFzQGFybS5j b20+Ci0tLQogYXJjaC9hcm02NC9pbmNsdWRlL2FzbS9lbGYuaCB8IDQgKystLQogZnMvY29tcGF0 X2JpbmZtdF9lbGYuYyAgICAgICB8IDUgKysrKysKIDIgZmlsZXMgY2hhbmdlZCwgNyBpbnNlcnRp b25zKCspLCAyIGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2FyY2gvYXJtNjQvaW5jbHVkZS9h c20vZWxmLmggYi9hcmNoL2FybTY0L2luY2x1ZGUvYXNtL2VsZi5oCmluZGV4IDAzYWRhMjk5ODRh Ny4uZWE5MjIxZWQ2OGExIDEwMDY0NAotLS0gYS9hcmNoL2FybTY0L2luY2x1ZGUvYXNtL2VsZi5o CisrKyBiL2FyY2gvYXJtNjQvaW5jbHVkZS9hc20vZWxmLmgKQEAgLTEwNSw3ICsxMDUsNyBAQAog ICogwqAgwqAgwqAgwqAgwqAgwqDCoENQVSo6IHwgYXJtMzLCoCDCoCAgIHwgYXJtNjQgICAgICB8 CiAgKiBFTEY6IMKgIMKgIMKgIMKgIMKgIMKgIMKgfCDCoCDCoCDCoCDCoCDCoCDCoHwgwqAgwqAg wqAgwqAgwqAgwqB8CiAgKiAtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tfC0tLS0tLS0t LS0tLXwKLSAqIG1pc3NpbmcgR05VX1NUQUNLIHwgZXhlYy1hbGwgwqAgfCBleGVjLWFsbCDCoCB8 CisgKiBtaXNzaW5nIEdOVV9TVEFDSyB8IGV4ZWMtYWxsIMKgIHwgZXhlYy1ub25lwqAgfAogICog R05VX1NUQUNLID09IFJXWCDCoHwgZXhlYy1zdGFjayB8IGV4ZWMtc3RhY2sgfAogICogR05VX1NU QUNLID09IFJXIMKgIHwgZXhlYy1ub25lICB8IGV4ZWMtbm9uZSAgfAogICoKQEAgLTExNyw3ICsx MTcsNyBAQAogICogICphbGwgYXJtNjQgQ1BVcyBzdXBwb3J0IE5YLCBzbyB0aGVyZSBpcyBubyAi bGFja3MgTlgiIGNvbHVtbi4KICAqCiAgKi8KLSNkZWZpbmUgZWxmX3JlYWRfaW1wbGllc19leGVj KGV4LHN0aykJKHN0ayA9PSBFWFNUQUNLX0RFRkFVTFQpCisjZGVmaW5lIGNvbXBhdF9lbGZfcmVh ZF9pbXBsaWVzX2V4ZWMoZXgsIHN0aykJKHN0ayA9PSBFWFNUQUNLX0RFRkFVTFQpCiAKICNkZWZp bmUgQ09SRV9EVU1QX1VTRV9SRUdTRVQKICNkZWZpbmUgRUxGX0VYRUNfUEFHRVNJWkUJUEFHRV9T SVpFCmRpZmYgLS1naXQgYS9mcy9jb21wYXRfYmluZm10X2VsZi5jIGIvZnMvY29tcGF0X2JpbmZt dF9lbGYuYwppbmRleCBhYWFkNGNhMTIxN2UuLjMwNjhkNTc0MzZiMyAxMDA2NDQKLS0tIGEvZnMv Y29tcGF0X2JpbmZtdF9lbGYuYworKysgYi9mcy9jb21wYXRfYmluZm10X2VsZi5jCkBAIC0xMTMs NiArMTEzLDExIEBACiAjZGVmaW5lCWFyY2hfc2V0dXBfYWRkaXRpb25hbF9wYWdlcyBjb21wYXRf YXJjaF9zZXR1cF9hZGRpdGlvbmFsX3BhZ2VzCiAjZW5kaWYKIAorI2lmZGVmCWNvbXBhdF9lbGZf cmVhZF9pbXBsaWVzX2V4ZWMKKyN1bmRlZgllbGZfcmVhZF9pbXBsaWVzX2V4ZWMKKyNkZWZpbmUJ ZWxmX3JlYWRfaW1wbGllc19leGVjIGNvbXBhdF9lbGZfcmVhZF9pbXBsaWVzX2V4ZWMKKyNlbmRp ZgorCiAvKgogICogUmVuYW1lIGEgZmV3IG9mIHRoZSBzeW1ib2xzIHRoYXQgYmluZm10X2VsZi5j IHdpbGwgZGVmaW5lLgogICogVGhlc2UgYXJlIGFsbCBsb2NhbCBzbyB0aGUgbmFtZXMgZG9uJ3Qg cmVhbGx5IG1hdHRlciwgYnV0IGl0Ci0tIAoyLjIwLjEKCgpfX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdAps aW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVh ZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==