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 539F922D7A6; Mon, 10 Mar 2025 17:59:34 +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=1741629574; cv=none; b=c+zLO1kLHeCHSt5sjF4hIM9/yiBW+v1b1TGFbalxLVfEvOHbf7oS+EFvWanJxbhx2jq7lgk5Ow3+a0V2/24P9HCyykZ9pezY10QFQmC6hArKEpYNcT50RamsmI7WVLkbF+zG5t7eXcubkqEKkKuUAQ7pLTLR8U4kSHwW67Mkz8I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629574; c=relaxed/simple; bh=cwuNPUJRi97RqF+IW0r/XifJr8MAoxvct4miUmZla60=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sGykdYAjQz7DicxinjLd0t/2A+1e6uqjkGhOAqlK0fNlhAi7psyF5y5s/6NTFJYQKOY/UOoR+LX4DD+RrdviJKcXzuMcumg9vcqFtgdxXKNay2Tx21KD+gJbH7UhNn5qMrYeZ40ZLGCQPqR+LumR51slaL+0FyrosHaopKlwKwc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uDZAwEUi; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="uDZAwEUi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBF3DC4CEED; Mon, 10 Mar 2025 17:59:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741629574; bh=cwuNPUJRi97RqF+IW0r/XifJr8MAoxvct4miUmZla60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uDZAwEUiG7yJpI2raoc+783rYRn0IgQ3AlyJYhDEPbunj/2qXWZMaa76JF2AeTo9B sxlo29fhq89LmTune4MEaLuSm9BAjnGEfc7yW04/IyXt5ARC9qaqGFmYjxlE88V3wM Jd4yCtgdK+1oMXIj4NEnluc3w0noxNuONvVhfcbs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Radu Rendec , Will Deacon , Sasha Levin Subject: [PATCH 5.15 341/620] arm64: cacheinfo: Avoid out-of-bounds write to cacheinfo array Date: Mon, 10 Mar 2025 18:03:07 +0100 Message-ID: <20250310170559.074396077@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170545.553361750@linuxfoundation.org> References: <20250310170545.553361750@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Radu Rendec [ Upstream commit 875d742cf5327c93cba1f11e12b08d3cce7a88d2 ] The loop that detects/populates cache information already has a bounds check on the array size but does not account for cache levels with separate data/instructions cache. Fix this by incrementing the index for any populated leaf (instead of any populated level). Fixes: 5d425c186537 ("arm64: kernel: add support for cpu cache information") Signed-off-by: Radu Rendec Link: https://lore.kernel.org/r/20250206174420.2178724-1-rrendec@redhat.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/cacheinfo.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/arch/arm64/kernel/cacheinfo.c b/arch/arm64/kernel/cacheinfo.c index 97c42be71338a..1510f457b6154 100644 --- a/arch/arm64/kernel/cacheinfo.c +++ b/arch/arm64/kernel/cacheinfo.c @@ -87,16 +87,18 @@ int populate_cache_leaves(unsigned int cpu) unsigned int level, idx; enum cache_type type; struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); - struct cacheinfo *this_leaf = this_cpu_ci->info_list; + struct cacheinfo *infos = this_cpu_ci->info_list; for (idx = 0, level = 1; level <= this_cpu_ci->num_levels && - idx < this_cpu_ci->num_leaves; idx++, level++) { + idx < this_cpu_ci->num_leaves; level++) { type = get_cache_type(level); if (type == CACHE_TYPE_SEPARATE) { - ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); - ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); + if (idx + 1 >= this_cpu_ci->num_leaves) + break; + ci_leaf_init(&infos[idx++], CACHE_TYPE_DATA, level); + ci_leaf_init(&infos[idx++], CACHE_TYPE_INST, level); } else { - ci_leaf_init(this_leaf++, type, level); + ci_leaf_init(&infos[idx++], type, level); } } return 0; -- 2.39.5