From nobody Mon Feb 9 03:11:07 2026 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5289F20CCF1 for ; Mon, 24 Feb 2025 22:52:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740437576; cv=none; b=ZL5xhQPherRXMukpaVxWhm2cieSrqVCpZeT2NpwVeWJe+J7tjCxe0ADRBRWogWTsDY2QW8tZ7UfXymccDFYin6c5DRMFUW/Aavs2g1m+HfkKp0nKuouYj7fQDK+pBpI8nEfS1LLfPL5nsb7MmB8VcXYg22/wg8Z7+rMJg7gteEI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740437576; c=relaxed/simple; bh=wCBUro8X74PEVZGjy8/v6ioiKNk+ksES9zc6oIeICgg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jSeNxiLdAOa+2lVKWxfVpdaw8jwgUdz2xqvFvJFONMp4boCqYZD4OmYviphwl7E7qV0AR8MQ4Yic/SX7DcTJO2DzRq5QxS+y/R1AmYddO9lOYKNiiQHe7R0QZD/fvBzSC25YIiNMi17SAsW7EH3k/9lEJkMQmaBcVDo67F+GnOU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=Gdfh3RDM; arc=none smtp.client-ip=209.85.214.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Gdfh3RDM" Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-216513f8104so11890305ad.2 for ; Mon, 24 Feb 2025 14:52:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1740437574; x=1741042374; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=JC+iCaenVWT1qC+wv1WYjnvGE2KwlNSxR7B2FLEJRHA=; b=Gdfh3RDMuL/f58E3rRMPSXDE481hOe7+hkV6sRSuAeK3oTMFbI5ngWeB0Co7L4y5mZ aimwR4seqrWPPgUf64FJDsh0aRci5+XZd6w4m1Htz3tCk2PTmH3OXypx/+QMcIaOEoJx Xk7S0m+RnbXMHNpt5NjlWW9lvB5bk7VbAa9jE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740437574; x=1741042374; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JC+iCaenVWT1qC+wv1WYjnvGE2KwlNSxR7B2FLEJRHA=; b=HeqiwlllJTbq0OoCYQb0mfMAf75NiVABOH67kN+vp7fG0mr+FLODiKyEyeDTKh9PGm O+SZhz35LzGpGiaTvG+seGkcLdvbgZnHMuI+32ZTpre6FdkRJPlcy7tWZLYHcrlB0wyD sFhlDFT8vdgvgJX1XIY6R3rRoWI9f7BToybeGIfdxzQcddiCQRn47JDkWSXm93abFc9c dXHNPAGDOkxehTTJ0oEvXNb7jrdprHwKsmTIAqZRkBVojafy3nAPM4Pkn9QQp1BveBTj 1Y2QZy/8wxUDrsUtCKhkqzlW8lMGBHzrNRZ4wzZYX8XHLUdIYpio5vWkMrPIAYetyx9o nWqA== X-Gm-Message-State: AOJu0YzfitxdN/7mfc1VQr72c1xl4LjZ8Sqcgeosga0ZAIVjDpIGv/fD HxLzH/GInyxUCiECW7mnCe6JnPNsH4M9aD5ZKyP1Wgmer0N0IL14JqXSC+y7jFNIJ8ErPLowNKo = X-Gm-Gg: ASbGncvh+0+/tR8c+4PtksNwpJEjqLkdfLfCBf3yGXC12ZO8LLjqBjKAdT8DTvIsiar 03j0yeXvfQ79/LeLxzoDNZaL9YozGPctcF3nDlUASRw4DWBRQ5jha4Jj4csE3UodYdo+OrEIYmR TgdZn+lDQjSuM2dkrVTMKH1nCAJVZK7ir8M4xlRYFA6oql5S4jeE/BVpL4qe3IIX/XdYSe7Sl3d I6+3kwU/87MeZbTULo4zEEqH2nSn1yvhNnwIgRk5Zd+wVDsnlFO/scuHaqrnrdzhIDrLeq26Mww nB0D5d2L4q0AjzJPvuijj8xCLIY/uc+JlStFcByKKI0FAZ2oZKKLafw8aLs0 X-Google-Smtp-Source: AGHT+IFWvMJ1DifgHpp00NgiU+l7P2X3hIfGn/N0QZgxCBlNaoLWIru7jUXTs0mtOdXL84lprXpfPg== X-Received: by 2002:a05:6a20:3d89:b0:1ee:d621:3c3f with SMTP id adf61e73a8af0-1eef3b1fcddmr10299435637.0.1740437574612; Mon, 24 Feb 2025 14:52:54 -0800 (PST) Received: from localhost (201.59.83.34.bc.googleusercontent.com. [34.83.59.201]) by smtp.gmail.com with UTF8SMTPSA id 41be03b00d2f7-aedaa6475dasm110603a12.54.2025.02.24.14.52.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Feb 2025 14:52:54 -0800 (PST) From: jeffxu@chromium.org To: akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz, lorenzo.stoakes@oracle.com, Liam.Howlett@Oracle.com, adhemerval.zanella@linaro.org, oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, hch@lst.de, ojeda@kernel.org, thomas.weissschuh@linutronix.de, adobriyan@gmail.com, johannes@sipsolutions.net, pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.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, aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com, Jeff Xu , Kees Cook Subject: [PATCH v7 7/7] mseal, system mappings: update mseal.rst Date: Mon, 24 Feb 2025 22:52:46 +0000 Message-ID: <20250224225246.3712295-8-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.658.g4767266eb4-goog In-Reply-To: <20250224225246.3712295-1-jeffxu@google.com> References: <20250224225246.3712295-1-jeffxu@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jeff Xu Update memory sealing documentation to include details about system mappings. Signed-off-by: Jeff Xu Reviewed-by: Kees Cook --- Documentation/userspace-api/mseal.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/userspac= e-api/mseal.rst index 41102f74c5e2..10147281bf2d 100644 --- a/Documentation/userspace-api/mseal.rst +++ b/Documentation/userspace-api/mseal.rst @@ -130,6 +130,13 @@ Use cases =20 - Chrome browser: protect some security sensitive data structures. =20 +- System mappings: + If supported by an architecture (via CONFIG_ARCH_HAS_MSEAL_SYSTEM_MAPPIN= GS), + the CONFIG_MSEAL_SYSTEM_MAPPINGS seals system mappings, e.g. vdso, vvar, + uprobes, sigpage, vectors, etc. CHECKPOINT_RESTORE, UML, gVisor, rr are + known to relocate or unmap system mapping, therefore this config can't be + enabled universally. + When not to use mseal =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Applications can apply sealing to any virtual memory region from userspace, --=20 2.48.1.658.g4767266eb4-goog