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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F0F97C5B572 for ; Wed, 19 Aug 2026 23:10:38 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8D80C6B00A4; Wed, 19 Aug 2026 19:10:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8B0086B00A5; Wed, 19 Aug 2026 19:10:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7C5D86B00A6; Wed, 19 Aug 2026 19:10:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 5057D6B00A4 for ; Wed, 19 Aug 2026 19:10:37 -0400 (EDT) Received: from smtpin23.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay09.hostedemail.com (Postfix) with ESMTP id BBD8280379 for ; Wed, 19 Aug 2026 23:10:36 +0000 (UTC) X-FDA: 85119565272.23.C933922 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf07.hostedemail.com (Postfix) with ESMTP id EEEE24000A for ; Wed, 19 Aug 2026 23:10:34 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=aheTWAgb; spf=pass (imf07.hostedemail.com: domain of brauner@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=brauner@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1787181035; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=fv8QyTU4RY8EKIZbQbAauqSD2AILso9hb2wl7UK1viQ=; b=ut4R/PkYXlO7xm2P0D9f2amWuW2w4xqLWKR4i8M5mMyEkkzHuuMoI/BDD1sOSDzfZt2gDR pS5PaCk3Pz1IikutNpoAGnWfyTX6VHVsSI6eIZ+ksHPDYYSes+/0bfNa2llR9/J1KBz1nB BdeohNByCaxw5fXxX7F/cs6tqXgPYWw= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787181035; b=UApTmKAWKfVRnd5E6brQW7E3DwenH+Io4Sk1IUGTXIIYmJERgT6yOT9c4VLF4jujnVZVvR c4afSgIiBdP4q8SQwRlQbVEMu91+QXFMMFmJ+WTNSKaVuYhja8/kwNFkbChCJAybJ8zike MD6xTlgjONCQVbT06a1qeSNAaI8sc0k= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=aheTWAgb; spf=pass (imf07.hostedemail.com: domain of brauner@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=brauner@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 4B34C43628; Wed, 19 Aug 2026 23:10:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 781B71F00A3A; Wed, 19 Aug 2026 23:10:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787181034; bh=fv8QyTU4RY8EKIZbQbAauqSD2AILso9hb2wl7UK1viQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=aheTWAgbYI11sVETqvJK2lIN/QCtKk+jUTksr8d38BZ1G7LXn5ciJU2kV1FMfrtmE x5Nnq5XYF01D52VOCaFlhDDagPSgLf9ydeEXG3GKOAegFGirsAEQjyZMqmBVaqlSwI pMwAwjK2lfA2z4C2jvG+KW1viiMGa5Sao32Hs3etES+osbUfbaYKUfkHjbsNwJnxAi i3AtybIxeJJE8yvuUcmJNRePJL+PQ7fBmXoSEKynClLfVT3MSCErW7T8lCghlChbMP tXhBq+ZxGanb0v3pCy6LWkCR8ljc2M14p/psUqtZ+tN63jM9P5d7T7xF9Alu0yONal 4itgWc3EmpRiQ== From: Christian Brauner Date: Thu, 20 Aug 2026 01:09:24 +0200 Subject: [PATCH v2 07/22] coredump: pin the protocol struct sizes MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260820-work-coredump-sparse-v2-7-ba32dd718c51@kernel.org> References: <20260820-work-coredump-sparse-v2-0-ba32dd718c51@kernel.org> In-Reply-To: <20260820-work-coredump-sparse-v2-0-ba32dd718c51@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Jacob Lalonde , Josef Bacik , Jann Horn , Alexander Viro , Jan Kara , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Omar Sandoval , Jacob Lalonde , Shuah Khan , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, "Christian Brauner (Amutable)" X-Mailer: b4 0.17-dev-362b8 X-Developer-Signature: v=1; a=openpgp-sha256; l=1921; i=brauner@kernel.org; h=from:subject:message-id; bh=hNfZLj4wkqR4WNDayaZ8RfIqHIoYlqBK8NeplKQdya8=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS1me+ruPdQcu/KV3delZuzLP6zVCXY77RHyZG1qzuUp 7bbKjst6ihlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZjI6nWMDKdaPMNPTbgbYhLi tExpbXfZXqfH7+b3BPyeeS3zD8esc7cZ/rvKPeP89C9O42WYhdi3Scq7956uZNLizXY+om1dYc9 Swg4A X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 X-Rspam-User: X-Stat-Signature: 4ujw7unmsmtkpggsb8qfqsnjfdhf7aiz X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: EEEE24000A X-HE-Tag: 1787181034-495191 X-HE-Meta: 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 aGMqkH1V aB4CkNcWWqcpX4C6vhOxvyUSroODS9gkFCLOavTRKriLPf5pcmwqlgt8HWpj6QoUjB8BNKGicyUVcQ0hztkWFF5tx3O4/vOg/naiy6zjqm+a3l4SGRGC1iUy7X/IOsOr4V3/FxP/WvKhNrHglazR6vz3vQAsqtguEDUOkHQpWpkd4RRvJphgGHidpBQvRfwEJrGYcUaBEZVnF4gli8AbTCyytytVI7Uk57snuGHeuM2ljJu6nc5k74kzsMQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: COREDUMP_REQ_SIZE_VER0 and COREDUMP_ACK_SIZE_VER0 define the initial struct sizes. Assert that both published sizes still match their structs. While at it fix some issues with docs. Signed-off-by: Christian Brauner (Amutable) --- fs/coredump.c | 2 ++ include/uapi/linux/coredump.h | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/coredump.c b/fs/coredump.c index 24a6405ea242..c696b46c97ff 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -759,6 +759,8 @@ static inline bool coredump_sock_send(struct file *file, struct coredump_req *re return ret == sizeof(*req); } +static_assert(sizeof(struct coredump_req) == COREDUMP_REQ_SIZE_VER0); +static_assert(sizeof(struct coredump_ack) == COREDUMP_ACK_SIZE_VER0); static_assert(sizeof(enum coredump_mark) == sizeof(__u32)); static inline bool coredump_sock_mark(struct file *file, enum coredump_mark mark) diff --git a/include/uapi/linux/coredump.h b/include/uapi/linux/coredump.h index dc3789b78af0..662e0468da6e 100644 --- a/include/uapi/linux/coredump.h +++ b/include/uapi/linux/coredump.h @@ -30,11 +30,11 @@ enum { * member is set to the size of struct coredump_req and provides a hint * to userspace how much data can be read. Userspace may use MSG_PEEK to * peek the size of struct coredump_req and then choose to consume it in - * one go. Userspace may also simply read a COREDUMP_ACK_SIZE_VER0 + * one go. Userspace may also simply read a COREDUMP_REQ_SIZE_VER0 * request. If the size the kernel sends is larger userspace simply * discards any remaining data. * - * The coredump_req->mask member is set to the currently know features. + * The coredump_req->mask member is set to the currently known features. * Userspace may only set coredump_ack->mask to the bits raised by the * kernel in coredump_req->mask. * -- 2.53.0