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[209.85.220.41]) by mx.google.com with SMTPS id d82sor16017301pfm.4.2019.02.11.10.52.13 for (Google Transport Security); Mon, 11 Feb 2019 10:52:13 -0800 (PST) Received-SPF: pass (google.com: domain of andreyknvl@google.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=ncBVT9ty; spf=pass (google.com: domain of andreyknvl@google.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=andreyknvl@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=onajfLzjwMOVtd+is/9izGJShjdIldm5SizvaLUaHmo=; b=ncBVT9tyNIxZ8aiOn7dnre8Goggom0TvQuIANUcxYHYcAfeeDAW/pJ1tXT7OKgQueF MwVqVQuXrOqAtT08VYAKSwE++I0VmP13ZxXyhW0aHCvpPht7QPP8DsjyNB1q9UiS9QQl 9nis0PU6XVMI930sTgtUCXc+fAmTp6gsgaaqqrv2IrcDnHYa8QQ6hciHJK6+lgRilZhN KdqVMLYVj7G0Grzr3UxJ2Dq0ijc+Xx3ACM1wwRK1oFZm7gwjlXdLXp02XnnVh4GoMf0t Uhm7OacraCe04mXWaJ3y/+i8oWGZKM8zgc/nBhN60h1PI8Pp5idnG3RIVGXQVzve/sCh iKDA== X-Google-Smtp-Source: AHgI3IZQFoZrbycn++mXjdTEjZaF9ayC32KEiKRH0Wc/WBMk/e+oR/Sql4ixUe/6CE8nd6+lelEMoUAztsut/G+K/Ak= X-Received: by 2002:a62:6047:: with SMTP id u68mr37586266pfb.239.1549911132174; Mon, 11 Feb 2019 10:52:12 -0800 (PST) MIME-Version: 1.0 References: <89b343eb-16ff-1020-2efc-55ca58fafae7@lca.pw> <59db8d6b-4224-2ec9-09de-909c4338b67a@lca.pw> <20190211121554.GB165128@arrakis.emea.arm.com> In-Reply-To: <20190211121554.GB165128@arrakis.emea.arm.com> From: Andrey Konovalov Date: Mon, 11 Feb 2019 19:52:01 +0100 Message-ID: Subject: Re: CONFIG_KASAN_SW_TAGS=y not play well with kmemleak To: Catalin Marinas Cc: Qian Cai , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , kasan-dev , Linux ARM , Linux-MM Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Feb 11, 2019 at 1:16 PM Catalin Marinas wrote: > > On Fri, Feb 08, 2019 at 06:15:02PM +0100, Andrey Konovalov wrote: > > On Fri, Feb 8, 2019 at 5:16 AM Qian Cai wrote: > > > Kmemleak is totally busted with CONFIG_KASAN_SW_TAGS=y because most of tracking > > > object pointers passed to create_object() have the upper bits set by KASAN. > > > > Yeah, the issue is that kmemleak performs a bunch of pointer > > comparisons that break when pointers are tagged. > > Does it mean that the kmemleak API receives pointer aliases (i.e. same > object tagged with different values or tagged/untagged)? Please disregard that comment. This is a bug in KASAN, will send a fix soon.