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 4C93CFC08 for ; Mon, 15 May 2023 17:42:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFA06C433EF; Mon, 15 May 2023 17:42:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684172559; bh=qiH6Q78HRt0KtkWuXHDlnhFGhd/Zw7UZ7mWe+nT+1Lw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0opFjuEoK+vXgwHVCSEfGijZwqC86UI9C096wGXdnKvYkfomb204p6xvhHveJOget jhZZQLHoXpCEWQDT8/HI61BSavZY4mJsX0u1IxjDfV8xq4Wei4gNq0yU7qCoqW8bnX IQXtSRlUdJpk2jWrLUXEi5me7b9rWxOu/XWD84fo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kal Conley , Magnus Karlsson , Martin KaFai Lau , Sasha Levin Subject: [PATCH 5.10 164/381] xsk: Fix unaligned descriptor validation Date: Mon, 15 May 2023 18:26:55 +0200 Message-Id: <20230515161744.211736691@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161736.775969473@linuxfoundation.org> References: <20230515161736.775969473@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Kal Conley [ Upstream commit d769ccaf957fe7391f357c0a923de71f594b8a2b ] Make sure unaligned descriptors that straddle the end of the UMEM are considered invalid. Currently, descriptor validation is broken for zero-copy mode which only checks descriptors at page granularity. For example, descriptors in zero-copy mode that overrun the end of the UMEM but not a page boundary are (incorrectly) considered valid. The UMEM boundary check needs to happen before the page boundary and contiguity checks in xp_desc_crosses_non_contig_pg(). Do this check in xp_unaligned_validate_desc() instead like xp_check_unaligned() already does. Fixes: 2b43470add8c ("xsk: Introduce AF_XDP buffer allocation API") Signed-off-by: Kal Conley Acked-by: Magnus Karlsson Link: https://lore.kernel.org/r/20230405235920.7305-2-kal.conley@dectris.com Signed-off-by: Martin KaFai Lau Signed-off-by: Sasha Levin --- include/net/xsk_buff_pool.h | 9 ++------- net/xdp/xsk_queue.h | 1 + 2 files changed, 3 insertions(+), 7 deletions(-) diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h index c9a47d3d8f503..5a63e3b12335a 100644 --- a/include/net/xsk_buff_pool.h +++ b/include/net/xsk_buff_pool.h @@ -150,13 +150,8 @@ static inline bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool, if (likely(!cross_pg)) return false; - if (pool->dma_pages_cnt) { - return !(pool->dma_pages[addr >> PAGE_SHIFT] & - XSK_NEXT_PG_CONTIG_MASK); - } - - /* skb path */ - return addr + len > pool->addrs_cnt; + return pool->dma_pages_cnt && + !(pool->dma_pages[addr >> PAGE_SHIFT] & XSK_NEXT_PG_CONTIG_MASK); } static inline u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr) diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 3c7ce60fe9a5a..a76d43787549f 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -155,6 +155,7 @@ static inline bool xp_unaligned_validate_desc(struct xsk_buff_pool *pool, return false; if (base_addr >= pool->addrs_cnt || addr >= pool->addrs_cnt || + addr + desc->len > pool->addrs_cnt || xp_desc_crosses_non_contig_pg(pool, addr, desc->len)) return false; -- 2.39.2