From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4E007309EEB; Sun, 19 Apr 2026 06:25:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776579949; cv=none; b=pg0tNnlQZOOk4jDQ7o9XY77axZAuchCBoVcvFi7cq2yYxAsZbjayl30NIQhlUfa+Aa+0eUBZW/FAzQ8QIp9zZC8Kqx0DbQQGyJeXjoIAaRwXWPlYkh148+AOT0qg+JHG65HDMMZ7PgFTH7OwVcPxF7/EcfSs2VdDgcJjYONCSDU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776579949; c=relaxed/simple; bh=WyWP+iZMeXxYC6vQkXO3ZkU7TGgZD/42Ny6itpdy6rk=; h=Date:To:From:Subject:Message-Id; b=d/w2XwFEg72vmhiacDM+re0vI61eLYbRxnW+VvxHKVvUSemYBUfAIw2pkiK/Orv1MWoSJ8H7zwUgdyUGNuJeVyq0N3FYMiWsfTP8NEZAYnuXYIkN2DRkJlArVRiwEbpjGGtOGVeJ4mZ98lpxnbbgHTRNtAe1Zkwv4J+06mWjAJE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=YAfb/MEJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="YAfb/MEJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C68AFC2BCAF; Sun, 19 Apr 2026 06:25:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1776579948; bh=WyWP+iZMeXxYC6vQkXO3ZkU7TGgZD/42Ny6itpdy6rk=; h=Date:To:From:Subject:From; b=YAfb/MEJcqlpuSFAFvc2/cwRsnWceTjhx4n/3tAy0CNOh0G1bkFRdAsbye9Hyosrz lJ0+DXfAsmSY9GwNA/e8Pte80TqfscOUr2Sb2GnK4/HRRsPI+AfmC11oZHMFR0U3GJ BsdjHfnp8C6MIYs305cyWLkkQtjpCl0tiJP7zuGk= Date: Sat, 18 Apr 2026 23:25:38 -0700 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-hotfixes-stable] mm-damon-core-disallow-non-power-of-two-min_region_sz-on-damon_start.patch removed from -mm tree Message-Id: <20260419062547.C68AFC2BCAF@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/damon/core: disallow non-power of two min_region_sz on damon_start() has been removed from the -mm tree. Its filename was mm-damon-core-disallow-non-power-of-two-min_region_sz-on-damon_start.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: SeongJae Park Subject: mm/damon/core: disallow non-power of two min_region_sz on damon_start() Date: Sat, 11 Apr 2026 14:36:36 -0700 Commit d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region") introduced a bug that allows unaligned DAMON region address ranges. Commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz") fixed it, but only for damon_commit_ctx() use case. Still, DAMON sysfs interface can emit non-power of two min_region_sz via damon_start(). Fix the path by adding the is_power_of_2() check on damon_start(). The issue was discovered by sashiko [1]. Link: https://lore.kernel.org/20260411213638.77768-1-sj@kernel.org Link: https://lore.kernel.org/20260403155530.64647-1-sj@kernel.org [1] Fixes: d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region") Signed-off-by: SeongJae Park Cc: # 6.18.x Signed-off-by: Andrew Morton --- mm/damon/core.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/mm/damon/core.c~mm-damon-core-disallow-non-power-of-two-min_region_sz-on-damon_start +++ a/mm/damon/core.c @@ -1368,6 +1368,11 @@ int damon_start(struct damon_ctx **ctxs, int i; int err = 0; + for (i = 0; i < nr_ctxs; i++) { + if (!is_power_of_2(ctxs[i]->min_region_sz)) + return -EINVAL; + } + mutex_lock(&damon_lock); if ((exclusive && nr_running_ctxs) || (!exclusive && running_exclusive_ctxs)) { _ Patches currently in -mm which might be from sj@kernel.org are