From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sipsolutions.net (s3.sipsolutions.net [168.119.38.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3ED76211A0A; Tue, 4 Feb 2025 18:17:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=168.119.38.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738693061; cv=none; b=u7wVz/LqU8BUMbmEKIPl7w9lrEuzSe3qMz2zRpW5NfFBKemOjxp7ZURm+Duj2lwGiiyhbJa/KeVEeGgCsKkDClBlu1CzdHfnzwbDkA9zw+ANmi8jiuMZnfB2mt4k8P6eFc2XlqHexoM+OIq8Ln+zFuMdFMwUql/E+GNJSTZIoMg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738693061; c=relaxed/simple; bh=22HW7+XMxKFHo+/mgAG8vFkQ7pc97tPqNxUhKaWnrMY=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=srTgDyv+oABul/pvTCuDtvy4E2WeeJieEKDK2QbqinFk13NqPRES+7rHHpVVjPdrIpkGgeEbYnWIIKYkgsERPp8Iz/F4IWAxyorJLfSHs1D3dSCEmJekuw9UukKlkGQOTjnUwoYSegT1XOMi5jngw1EcrMz535WPhab6a0a9WLo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net; spf=pass smtp.mailfrom=sipsolutions.net; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b=ceYszPlh; arc=none smtp.client-ip=168.119.38.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b="ceYszPlh" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=MIME-Version:Content-Transfer-Encoding: Content-Type:References:In-Reply-To:Date:To:From:Subject:Message-ID:Sender: Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=22HW7+XMxKFHo+/mgAG8vFkQ7pc97tPqNxUhKaWnrMY=; t=1738693059; x=1739902659; b=ceYszPlhqkMuxN6NllJDVHMbEZMkTQzz4xgOCf6P/ALyoMl ecg9njnF44ujllqJ4zKU96uxR8Vyd4b8RDOob+HHRpzHMZwFJ/tY8rfB4rebrIf1WD7z1d9ryDFJh wG1BOxXvOXuW8XRTpufHctvTY+GRVaP1SnQdnXbEIp6Eue1A8ECkSoYYz/1sHY49yaREN4aLv5An0 X/Du2yvlDSrLRA6f5DpVg0Id6trR7R3X5BckuDPI6jqNxFYhWm/NeKk6sfpnrUbGTWeGfjAk+alyp gtb+TsOAEHDxEQnwUoEYLaDBsWGIn/ppxwfOApyHgKIp/Ggjr1TakTy5Sajl6+9w==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.98) (envelope-from ) id 1tfNUH-00000002sDY-46kF; Tue, 04 Feb 2025 19:17:30 +0100 Message-ID: <553df4d7ddadb0580a2c35fcf8d5b8c3aca69449.camel@sipsolutions.net> Subject: Re: [PATCH v4 1/1] exec: seal system mappings From: Johannes Berg To: "Liam R. Howlett" , Kees Cook , jeffxu@chromium.org, akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, adhemerval.zanella@linaro.org, oleg@redhat.com, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, ojeda@kernel.org, adobriyan@gmail.com, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, hch@lst.de, peterx@redhat.com, hca@linux.ibm.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, Vlastimil Babka , Lorenzo Stoakes , Andrei Vagin , Dmitry Safonov <0x7f454c46@gmail.com>, Mike Rapoport , Alexander Mikhalitsyn Date: Tue, 04 Feb 2025 19:17:28 +0100 In-Reply-To: References: <20241125202021.3684919-1-jeffxu@google.com> <20241125202021.3684919-2-jeffxu@google.com> <202412171248.409B10D@keescook> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-malware-bazaar: not-scanned On Fri, 2025-01-03 at 15:48 -0500, Liam R. Howlett wrote: >=20 > So we have at least two userspace uses that this will breaks: checkpoint > restore and now gVisor, but who knows what else? I believe we previously pointed out it might also break running the ARCH=3Dum kernel: https://lore.kernel.org/all/2e5de601da34342d8eb0d8319dcf81ff213c7ef0.camel@= sipsolutions.net/ johannes