From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=195.135.223.131 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793117636; b=Qguj6G8xM46Y1wTZHjtsqVpyAPxt6XCklVdFWzv6FGQB8FTCW7iQ9x+51Pd7YkHNqoLB gpT31h1x/Kvb4f93TZSivVV3pMCfhTuicwnBEB2vFgNUMc8jwGWk8ERM/VP8BA5U/Dahs S1GRlv6f93JY4xCPk8anSNtvywv+2rJneqNheUSLdRSLf/q2L/vYRGDfoyz68UwsfbDOv 8AUzcIV+Dbyf6C+aYzdD3JuVgedU9HuU0/XHZwh2mjoq2Eft6V5t5D0YbL4iAUYnLB8Ay RC4if8xjv2j95WSVFQYGbp1zEun38F3SNC9mxIwo2trS09n2RGJnMhp8Tw8CoLjLanA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793117636; h=DMARC-Filter:Received:DKIM-Signature:DKIM-Signature:DKIM-Signature: DKIM-Signature:Received:Received:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To: X-Spamd-Result:X-Rspamd-Server:X-Rspamd-Action:X-Spam-Flag: X-Spam-Score:X-Spam-Level:X-Rspamd-Queue-Id; bh=MBEQAycQgkIcEKsq6ztpW2tH5GM0tXm64sgJ8VgKzao=; b=U7o6vnF3TztnTFVzyGxrO+ColCkKwE5iliTKGnD/TgR6LCVd7xBs/rUMtOOlA8bk9lcd gwnexTawVCBpYUrH5Porx6vLhQCOQP7E57QxU7IyUPHj9/hovOFvEWGi9r2Y1RheU2Jci diSv3gfL3Twz7J+z3wkVrz8uMQQjwlSmRl7wu6zNbmBF5WhUAtuWFMyIiDLJx5v1u8+K2 TS0CAGcsD/hGjlnDMuno3YUjcj7sssb1mq3ZnixecoMWB9l1EjgPy0Zow2l+mM2mW5thH IpPWkzij+tjDuKuVwix3pM7ON0iHTZuK9uXebtkl4DEOm/R2DKe23A6ZrKJNqBa/m0w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=Pf9TMmXl; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=CvY1UKHl; dkim=pass header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=Pf9TMmXl; dkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=CvY1UKHl; arc=none smtp.remote-ip=195.135.223.131 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7950E606A31E; Tue, 27 Oct 2026 16:13:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 7950E606A31E Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=Pf9TMmXl; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=CvY1UKHl; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=Pf9TMmXl; dkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=CvY1UKHl Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 9D68F1F456; Tue, 27 Oct 2026 16:13:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1793117633; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=MBEQAycQgkIcEKsq6ztpW2tH5GM0tXm64sgJ8VgKzao=; b=Pf9TMmXlDhCO4ynIeOuzNkis0rtWRzFwFx2jgiRQmuRDnln2k7nvVvhmkcP0jEP7dIidfr Bk9Z91c21pllbjuaaPr2fgK73IzUBOFhJWiWnPXD6TINWJnxzMN0TQKPGVdS/+GbDA8Z3m W8oQyc3pYUvTbT9+XEhV6lxyovFdl3I= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1793117633; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=MBEQAycQgkIcEKsq6ztpW2tH5GM0tXm64sgJ8VgKzao=; b=CvY1UKHlmsc3sDkKp60Jh/ntQBcPqvbbbFSuHsUIh7jEbt5Go2TV2gTcqvAb3Q7XhLiFBT DMyyXxV3RhKSHVDw== Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=Pf9TMmXl; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=CvY1UKHl DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1793117633; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=MBEQAycQgkIcEKsq6ztpW2tH5GM0tXm64sgJ8VgKzao=; b=Pf9TMmXlDhCO4ynIeOuzNkis0rtWRzFwFx2jgiRQmuRDnln2k7nvVvhmkcP0jEP7dIidfr Bk9Z91c21pllbjuaaPr2fgK73IzUBOFhJWiWnPXD6TINWJnxzMN0TQKPGVdS/+GbDA8Z3m W8oQyc3pYUvTbT9+XEhV6lxyovFdl3I= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1793117633; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=MBEQAycQgkIcEKsq6ztpW2tH5GM0tXm64sgJ8VgKzao=; b=CvY1UKHlmsc3sDkKp60Jh/ntQBcPqvbbbFSuHsUIh7jEbt5Go2TV2gTcqvAb3Q7XhLiFBT DMyyXxV3RhKSHVDw== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 8A7221321C; Tue, 27 Oct 2026 16:13:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id dzfmFb3N4GrrdwAAD6G6ig (envelope-from ); Tue, 27 Oct 2026 16:13:49 +0000 Date: Tue, 27 Oct 2026 16:13:47 +0000 From: Pedro Falcato To: "David Hildenbrand (Arm)" Cc: Andrew Morton , Johannes Weiner , Michal Hocko , Qi Zheng , Shakeel Butt , Lorenzo Stoakes , Kairui Song , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kees Cook , Peter Zijlstra , Jann Horn , Hugh Dickins , Pasha Tatashin , Pratyush Yadav , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Lance Yang , Rik van Riel , Harry Yoo , Alistair Popple , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl Shutsemau , Matthew Brost , John Hubbard , Peter Xu , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Oscar Salvador , Minchan Kim , Muchun Song , Xu Xin , Chengming Zhou , Chris Li , Kemeng Shi , Nhat Pham , Youngjun Park , Gregory Price , Joshua Hahn , Rakie Kim , Ying Huang , Jason Gunthorpe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, Josef Bacik Subject: Re: [PATCH 46/46] fs/proc/task_mmu: refuse addresses beyond 32 bits on 32bit Message-ID: References: <20261027-fixes_core-v1-0-6f74bec9a5bb@kernel.org> <20261027-fixes_core-v1-46-6f74bec9a5bb@kernel.org> X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261027-fixes_core-v1-46-6f74bec9a5bb@kernel.org> X-Spamd-Result: default: False [-12.01 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_CC(0.00)[linux-foundation.org,cmpxchg.org,kernel.org,linux.dev,tencent.com,google.com,linux.alibaba.com,infradead.org,suse.com,soleen.com,suse.cz,nvidia.com,surriel.com,arm.com,intel.com,redhat.com,gmail.com,suse.de,huaweicloud.com,lge.com,gourry.net,sk.com,ziepe.ca,kvack.org,vger.kernel.org,lists.infradead.org,toxicpanda.com]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; RCPT_COUNT_GT_50(0.00)[64]; TAGGED_RCPT(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; MISSING_XM_UA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[toxicpanda.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:email,suse.de:dkim] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -12.01 X-Spam-Level: X-Rspamd-Queue-Id: 9D68F1F456 On Tue, Oct 27, 2026 at 12:18:06AM +0100, David Hildenbrand (Arm) wrote: > From: Josef Bacik > > The addresses in struct pm_scan_arg are 64 bits wide. The first thing > pagemap_scan_get_args() does with them is to cast them to unsigned > long. On a 32-bit kernel the upper half is dropped without a word: > PAGEMAP_SCAN of 0x100001000-0x100002000 scans, and with > PM_SCAN_WP_MATCHING write-protects, 0x1000-0x2000, stores the result > at the lower half of vec, and reports success. > > Return -EFAULT, as for other addresses outside of the address space. > > This is probably not worth CCing stable. > > Fix generated by an LLM and sent by Josef Bacik in private. > > Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs") > Signed-off-by: Josef Bacik > Acked-by: Lorenzo Stoakes (ARM) > Signed-off-by: David Hildenbrand (Arm) Reviewed-by: Pedro Falcato -- Pedro