From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B03B5C2B9FC for ; Wed, 12 May 2021 19:57:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95BD961422 for ; Wed, 12 May 2021 19:57:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383953AbhELT4J (ORCPT ); Wed, 12 May 2021 15:56:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:53456 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241624AbhELSIs (ORCPT ); Wed, 12 May 2021 14:08:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D5F3261447; Wed, 12 May 2021 18:04:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620842697; bh=iyGI1xaaTjmQoglGchyr9CKLVM3atq60dBSUj6ny9uY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lNFxzc0PVMtTQjO75k3imYuulh/2uBg4kQnlOKvhMVfc7aVYonCn3K4w3DuGvEwh2 6NzB0zFV9L2ofBypFk1UhGFxwS0jcN62VBF3jTz/9x5Gb1TTSIkZumztimA/6RcLkq CKclRUUXWsvvbKf/pHATgFFMN5pMOVnMHdYgg7btjhZfJB0AKDSwvbni3T3MthElY6 V3mGeyIznqWhowiXreZutdBb1uPDVkMHviYQtYxkgp4wehRlt5S0tsD9s4OMsfEVkr xF4Ydfl+2mInMzYnPVW/usKcpQUQijQ1nI3y/cFjjZX4JZRwC5NjZACvRJL3dclXjz 95Ime4iS/+Tbw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Chao Yu , butt3rflyh4ck , Jaegeuk Kim , Sasha Levin , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH AUTOSEL 4.19 04/18] f2fs: fix to avoid out-of-bounds memory access Date: Wed, 12 May 2021 14:04:35 -0400 Message-Id: <20210512180450.665586-4-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210512180450.665586-1-sashal@kernel.org> References: <20210512180450.665586-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chao Yu [ Upstream commit b862676e371715456c9dade7990c8004996d0d9e ] butt3rflyh4ck reported a bug found by syzkaller fuzzer with custom modifications in 5.12.0-rc3+ [1]: dump_stack+0xfa/0x151 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x82/0x32c mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 f2fs_test_bit fs/f2fs/f2fs.h:2572 [inline] current_nat_addr fs/f2fs/node.h:213 [inline] get_next_nat_page fs/f2fs/node.c:123 [inline] __flush_nat_entry_set fs/f2fs/node.c:2888 [inline] f2fs_flush_nat_entries+0x258e/0x2960 fs/f2fs/node.c:2991 f2fs_write_checkpoint+0x1372/0x6a70 fs/f2fs/checkpoint.c:1640 f2fs_issue_checkpoint+0x149/0x410 fs/f2fs/checkpoint.c:1807 f2fs_sync_fs+0x20f/0x420 fs/f2fs/super.c:1454 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x1b5/0x260 fs/sync.c:48 generic_shutdown_super+0x70/0x370 fs/super.c:448 kill_block_super+0x97/0xf0 fs/super.c:1394 The root cause is, if nat entry in checkpoint journal area is corrupted, e.g. nid of journalled nat entry exceeds max nid value, during checkpoint, once it tries to flush nat journal to NAT area, get_next_nat_page() may access out-of-bounds memory on nat_bitmap due to it uses wrong nid value as bitmap offset. [1] https://lore.kernel.org/lkml/CAFcO6XOMWdr8pObek6eN6-fs58KG9doRFadgJj-FnF-1x43s2g@mail.gmail.com/T/#u Reported-and-tested-by: butt3rflyh4ck Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/node.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 1934dc6ad1cc..ff3f97ba1a55 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -2654,6 +2654,9 @@ static void remove_nats_in_journal(struct f2fs_sb_info *sbi) struct f2fs_nat_entry raw_ne; nid_t nid = le32_to_cpu(nid_in_journal(journal, i)); + if (f2fs_check_nid_range(sbi, nid)) + continue; + raw_ne = nat_in_journal(journal, i); ne = __lookup_nat_cache(nm_i, nid); -- 2.30.2