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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61242C77B6E for ; Sat, 1 Apr 2023 01:45:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233823AbjDABpn (ORCPT ); Fri, 31 Mar 2023 21:45:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233657AbjDABpF (ORCPT ); Fri, 31 Mar 2023 21:45:05 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CEFDA1EFE3; Fri, 31 Mar 2023 18:43:59 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id ADCB6B8331B; Sat, 1 Apr 2023 01:43:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A016C433D2; Sat, 1 Apr 2023 01:43:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1680313433; bh=+CQiA2TpuPtNk29w+WbITPO+Y/iqiI7Ncoa4XcxFW/I=; h=From:To:Cc:Subject:Date:From; b=BfttM5nAReRBBPaZ6JQkvC80GgSXaoPOJVn4JyRK7XXO+Ow3ssbtljnW56CXYl/3h iEJKnrI1vx4tWZGmzsIHkvFHdPwUA1SxiffGPOsLxxa330MiY/oT6W1jIr/f0pHbK4 Gd5uMql/PUiMrf8dgqELlliSEyMRa02GOYdXEe8i/ke3ng8A4A9PW5aIh9uJOGt+Gb oe6zgnA5fwdJ02bfjMJ4jb+ttPKaSx4YyNX7yScyGTdw5rhq4ArscQHXRlm5chupmK Z/jpwf+c4sF+OWOdo6ORz8UCsiOxhiLFI89KQYSTcwv09/CZ0sEOIWH/ELNc3adLgn mK+Y+ejXWNnmQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andrew Jeffery , Zev Weiss , Arnd Bergmann , Russell King , Sasha Levin , linux@armlinux.org.uk, akpm@linux-foundation.org, anshuman.khandual@arm.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.15 01/11] ARM: 9290/1: uaccess: Fix KASAN false-positives Date: Fri, 31 Mar 2023 21:43:39 -0400 Message-Id: <20230401014350.3357107-1-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrew Jeffery [ Upstream commit ceac10c83b330680cc01ceaaab86cd49f4f30d81 ] __copy_to_user_memcpy() and __clear_user_memset() had been calling memcpy() and memset() respectively, leading to false-positive KASAN reports when starting userspace: [ 10.707901] Run /init as init process [ 10.731892] process '/bin/busybox' started with executable stack [ 10.745234] ================================================================== [ 10.745796] BUG: KASAN: user-memory-access in __clear_user_memset+0x258/0x3ac [ 10.747260] Write of size 2687 at addr 000de581 by task init/1 Use __memcpy() and __memset() instead to allow userspace access, which is of course the intent of these functions. Signed-off-by: Andrew Jeffery Signed-off-by: Zev Weiss Reviewed-by: Arnd Bergmann Signed-off-by: Russell King (Oracle) Signed-off-by: Sasha Levin --- arch/arm/lib/uaccess_with_memcpy.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/lib/uaccess_with_memcpy.c b/arch/arm/lib/uaccess_with_memcpy.c index 106f83a5ea6d2..35e03f6a62127 100644 --- a/arch/arm/lib/uaccess_with_memcpy.c +++ b/arch/arm/lib/uaccess_with_memcpy.c @@ -121,7 +121,7 @@ __copy_to_user_memcpy(void __user *to, const void *from, unsigned long n) tocopy = n; ua_flags = uaccess_save_and_enable(); - memcpy((void *)to, from, tocopy); + __memcpy((void *)to, from, tocopy); uaccess_restore(ua_flags); to += tocopy; from += tocopy; @@ -188,7 +188,7 @@ __clear_user_memset(void __user *addr, unsigned long n) tocopy = n; ua_flags = uaccess_save_and_enable(); - memset((void *)addr, 0, tocopy); + __memset((void *)addr, 0, tocopy); uaccess_restore(ua_flags); addr += tocopy; n -= tocopy; -- 2.39.2