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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 F1E30ECE58E for ; Tue, 8 Oct 2019 09:47:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B7692217D7 for ; Tue, 8 Oct 2019 09:47:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="cXYZ/yJK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B7692217D7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lca.pw Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 531D38E0005; Tue, 8 Oct 2019 05:47:33 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4930F8E0003; Tue, 8 Oct 2019 05:47:33 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 35AF68E0005; Tue, 8 Oct 2019 05:47:33 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0251.hostedemail.com [216.40.44.251]) by kanga.kvack.org (Postfix) with ESMTP id 156B18E0003 for ; Tue, 8 Oct 2019 05:47:33 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id A4572181AC9CB for ; Tue, 8 Oct 2019 09:47:32 +0000 (UTC) X-FDA: 76020139944.05.flock26_79797fa0f12a X-HE-Tag: flock26_79797fa0f12a X-Filterd-Recvd-Size: 3587 Received: from mail-qk1-f193.google.com (mail-qk1-f193.google.com [209.85.222.193]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Tue, 8 Oct 2019 09:47:32 +0000 (UTC) Received: by mail-qk1-f193.google.com with SMTP id w2so16055854qkf.2 for ; Tue, 08 Oct 2019 02:47:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=qLgfnJa8TF+fqJn6Csm2aNbaRpOd4zDzxzOPf12HbGU=; b=cXYZ/yJKZHxhLdFc+J/7aqzW3aWMwrEzbFfkVK6b2STx6QHscvIWH7imnBEe4+5hu8 /u0EZHWjyQPT1nvtbEF/Q0Kg9i/YqCDMse7zLQQlF9qvnZzDAYO5lv25xZR6t9BXHcuq ah+dWBDMRgaikW+rvVfyvyISzE+jZZi8EytVeEJcb33yP6AZXWRPX4ij4dNNh6n//HA4 ZeX5K7IRgHSrqr/EWrbf7Id2OL3sA+Y9zt+wp0c875bq5Eka/sHOIgqCnKbwSuEhZiRH Ywn2sJjbAl32mBITdW2nABbm8slhsaxFggyDU0O6KlXeMgbBlIYIBTgAtq0NFFUY9INh Kx7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=qLgfnJa8TF+fqJn6Csm2aNbaRpOd4zDzxzOPf12HbGU=; b=aGrDWIsAbzagwv2JzKVgDjXzIa3WawzrKzI0K7sFrKCsTVZ8q/BQ6m1b8+Ajn1Zp2u nBMwYd5vkT6xqI1eG0cXpO7HLg7/sTOU2xrdMidiYfkwb2ezhe8vKuhrZtcmqKCSLqCy 33eEafCQ4M/Oi4eJr3kWozgfv/hSi4lmGYry9hvfhm2OSDmEVkyKeaI8jfKTomgy6JSJ 8DH+KdVkhhYcHAYAwqpcRKNsvAkvPqIPwDaJZFYL0R63opSz8fOjhRsr1Gt3OlJxf0XW hhAI8zmVVO0QhkVfE/HoPXqz/lUJLDTL1nu0W+QuUD1e0ouDrO3IQzHd9IDWpe4BLVwk nQZQ== X-Gm-Message-State: APjAAAVFm/cyrWkVvKXUSeVo8lX/FxHxidFZuKfhQq/ovHOI54toA1ke R2hwfSI8Yhk+m8OGVF1IONM8bQ== X-Google-Smtp-Source: APXvYqxfD11gEiq1MLqW9BfGOXUQNepLHs6yxjwdSPwZov/5cEt3QgQYUXTBcN37CEYZ7nm6dUXSjQ== X-Received: by 2002:a37:4d4a:: with SMTP id a71mr28591867qkb.327.1570528051524; Tue, 08 Oct 2019 02:47:31 -0700 (PDT) Received: from [192.168.1.183] (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id h68sm8988573qkd.35.2019.10.08.02.47.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Oct 2019 02:47:30 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y Date: Tue, 8 Oct 2019 05:47:30 -0400 Message-Id: References: <1570515358.4686.97.camel@mtksdccf07> Cc: Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Matthias Brugger , LKML , kasan-dev , Linux-MM , Linux ARM , linux-mediatek@lists.infradead.org, wsd_upstream In-Reply-To: <1570515358.4686.97.camel@mtksdccf07> To: Walter Wu X-Mailer: iPhone Mail (17A860) X-Bogosity: Ham, tests=bogofilter, spamicity=0.006814, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Oct 8, 2019, at 2:16 AM, Walter Wu wrote: >=20 > It is an undefined behavior to pass a negative numbers to > memset()/memcpy()/memmove(), so need to be detected by KASAN. Why can=E2=80=99t this be detected by UBSAN?=