From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793098537; b=5fjaCYJWSw5X60Gqc8UgInLrywheLsTZuNEzyouAoUJlK01RCKf/77OvPgiGSw62eb3e lBBaPmokpk88v76xylHazvGKrvaytVhbQAPxz/sWa3hH6U4NReZob3D7haQluRjP1YKaX t2ahb6OaX+9HBFg01dFg89/hSIBf1RwXmrBNRGYQY5gcdKx91McgS3u+D9d9ZUBPoIbDR c+w4CPlAAdvy7N0pXliPfbv50DIjfXro/VsQOluuDHKPK8bpLUxfzy1VZDW3RNtc2bMgG UO16LPivBir5lXzTww56ist3hhsXqHZ/1f9Z7aEer61RBrOk6+Nof3TDClN+3mR0AUQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793098537; h=DMARC-Filter:Received:Received:DKIM-Signature:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; bh=AKbxYvklE+RtW/4px6T7qZCglKItX3GKgrMwqEp3qDw=; b=qhQ68tJ0DHfjqdFUt9JhzenICw2yLmojAVRhHu7lcuTPzkBCgEGvNfTtswj83THOyiki 3fyrp4cUPd4as8Tulo/LUenGSAuVZo5dhvn0UkDIL2q6BP/1DKqjV5VwBwKx3MjD400Ou BPGuJR1uAkiZ/1W2yyyrSXGKROjXKYtjDzJUAidJ5KB5APJYCRpHYss3ekN4U2xSUewHu /j4dG+vf4jJOcmoSODuqVBwn4aixpqHvjHXubGL1oslKCzsXe2YYLUcyuC6gnm+vfYTad YVdejlgqwMxfxvZm+XK5jjZKc6bLFnxcIowzGceiJZbcazgITdnhMAmTWWzT5ud/R/w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=hc95gwYr; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E22CC606A31A; Tue, 27 Oct 2026 10:55:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org E22CC606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=hc95gwYr Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D800615A1; Tue, 27 Oct 2026 03:55:30 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E00023F59E; Tue, 27 Oct 2026 03:55:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1793098533; bh=2KWWEm3YGgOg7VXROLDs0BaAsOc3yp6g0LrHlJpAeJ8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hc95gwYr4hlRyW/o5zs0jyhfOGs74Do+ch0sJPW5V5HxppF6ribgfdRKL5l+Ph1qM divMRR/TWoxxKhidxaYV5/bLcdzmWWzi7zrZ3SsmUbA2ws9BGJeDnbCnPVa+mkE9Qm v0KvihGVOgmtbN05Kl4GX9PpZb6J8aJNpWqTJH9I= Date: Tue, 27 Oct 2026 10:55:29 +0000 From: Catalin Marinas To: Hungyu Lin Cc: akpm@linux-foundation.org, david@kernel.org, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, andreyknvl@gmail.com, vincenzo.frascino@arm.com, odys.yuan@gmail.com, sashiko-bot@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] mm/migrate: untag addresses when querying page nodes Message-ID: References: <20261026195330.46757-1-dennylin0707@gmail.com> X-Mailing-List: linux-kernel@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: <20261026195330.46757-1-dennylin0707@gmail.com> On Mon, Oct 26, 2026 at 07:53:29PM +0000, Hungyu Lin wrote: > When move_pages() is used with nodes == NULL, do_pages_stat_array() > passes each page address directly to vma_lookup(). A valid tagged address > therefore fails the VMA lookup and gets -EFAULT in its status entry, > instead of the node reported for the corresponding untagged address. > > The tagged address ABI permits these pointers, and the migration path > already removes their tags. Apply the target mm's untagging rules to > the query path as well, while holding its mmap read lock. > > Fixes: 057d3389108e ("mm: untag user pointers passed to memory syscalls") > Reported-by: Sashiko > Closes: https://lore.kernel.org/r/20260721183257.706661F000E9@smtp.kernel.org > Cc: stable@vger.kernel.org > Signed-off-by: Hungyu Lin > Acked-by: Zi Yan > Acked-by: David Hildenbrand (Arm) Reviewed-by: Catalin Marinas