From patchwork Wed Oct 19 15:37:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 13012048 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E98AC433FE for ; Wed, 19 Oct 2022 15:37:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 845136B0073; Wed, 19 Oct 2022 11:37:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7F59E6B0074; Wed, 19 Oct 2022 11:37:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6BCFF6B0075; Wed, 19 Oct 2022 11:37:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 589B76B0073 for ; 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dkim=pass header.d=kernel.org header.s=k20201202 header.b=rdDLnjfb; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf03.hostedemail.com: domain of nathan@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=nathan@kernel.org X-Rspam-User: X-Rspamd-Server: rspam06 X-Stat-Signature: 47f6r643bddj5pwp7gddbf6us3hbdjgx X-Rspamd-Queue-Id: 716E220033 X-HE-Tag: 1666193843-74686 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: Hi all, I am seeing the following set of warnings when building an x86_64 configuration that has CONFIG_FORTIFY_SOURCE=y and CONFIG_KMSAN=y: In file included from scripts/mod/devicetable-offsets.c:3: In file included from ./include/linux/mod_devicetable.h:13: In file included from ./include/linux/uuid.h:12: In file included from ./include/linux/string.h:253: ./include/linux/fortify-string.h:496:9: error: 'memcpy' macro redefined [-Werror,-Wmacro-redefined] #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \ ^ ./arch/x86/include/asm/string_64.h:17:9: note: previous definition is here #define memcpy __msan_memcpy ^ In file included from scripts/mod/devicetable-offsets.c:3: In file included from ./include/linux/mod_devicetable.h:13: In file included from ./include/linux/uuid.h:12: In file included from ./include/linux/string.h:253: ./include/linux/fortify-string.h:500:9: error: 'memmove' macro redefined [-Werror,-Wmacro-redefined] #define memmove(p, q, s) __fortify_memcpy_chk(p, q, s, \ ^ ./arch/x86/include/asm/string_64.h:73:9: note: previous definition is here #define memmove __msan_memmove ^ 2 errors generated. I can see that commit ff901d80fff6 ("x86: kmsan: use __msan_ string functions where possible.") appears to include a fix up for this warning with memset() but not memcpy() or memmove(). If I apply a similar fix up like so: or is there a different obvious fix that I am missing? Cheers, Nathan diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h index 4029fe368a4f..718ee17b31e3 100644 --- a/include/linux/fortify-string.h +++ b/include/linux/fortify-string.h @@ -493,6 +493,7 @@ __FORTIFY_INLINE bool fortify_memcpy_chk(__kernel_size_t size, * __struct_size() vs __member_size() must be captured here to avoid * evaluating argument side-effects further into the macro layers. */ +#ifndef CONFIG_KMSAN #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \ __struct_size(p), __struct_size(q), \ __member_size(p), __member_size(q), \ @@ -501,6 +502,7 @@ __FORTIFY_INLINE bool fortify_memcpy_chk(__kernel_size_t size, __struct_size(p), __struct_size(q), \ __member_size(p), __member_size(q), \ memmove) +#endif extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan); __FORTIFY_INLINE void *memscan(void * const POS0 p, int c, __kernel_size_t size) Then the instances of -Wmacro-redefined disappear but the fortify tests no longer pass for somewhat obvious reasons: warning: unsafe memcpy() usage lacked '__read_overflow2' symbol in lib/test_fortify/read_overflow2-memcpy.c warning: unsafe memmove() usage lacked '__read_overflow2' symbol in lib/test_fortify/read_overflow2-memmove.c warning: unsafe memcpy() usage lacked '__read_overflow2_field' symbol in lib/test_fortify/read_overflow2_field-memcpy.c warning: unsafe memmove() usage lacked '__read_overflow2_field' symbol in lib/test_fortify/read_overflow2_field-memmove.c warning: unsafe memcpy() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-memcpy.c warning: unsafe memmove() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-memmove.c warning: unsafe memset() usage lacked '__write_overflow' symbol in lib/test_fortify/write_overflow-memset.c warning: unsafe memcpy() usage lacked '__write_overflow_field' symbol in lib/test_fortify/write_overflow_field-memcpy.c warning: unsafe memmove() usage lacked '__write_overflow_field' symbol in lib/test_fortify/write_overflow_field-memmove.c warning: unsafe memset() usage lacked '__write_overflow_field' symbol in lib/test_fortify/write_overflow_field-memset.c Should CONFIG_KMSAN depend on CONFIG_FORTIFY_SOURCE=n like so? It seems like the two features are incompatible if I am reading ff901d80fff6 correctly. diff --git a/lib/Kconfig.kmsan b/lib/Kconfig.kmsan index b2489dd6503f..6a681621e3c5 100644 --- a/lib/Kconfig.kmsan +++ b/lib/Kconfig.kmsan @@ -11,7 +11,7 @@ config HAVE_KMSAN_COMPILER config KMSAN bool "KMSAN: detector of uninitialized values use" depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER - depends on SLUB && DEBUG_KERNEL && !KASAN && !KCSAN + depends on SLUB && DEBUG_KERNEL && !KASAN && !KCSAN && !FORTIFY_SOURCE select STACKDEPOT select STACKDEPOT_ALWAYS_INIT help