From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f49.google.com (mail-qv1-f49.google.com [209.85.219.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B2F252609EE for ; Fri, 15 May 2026 16:34:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862854; cv=none; b=LbeK1kWCbrCkNxlmuLAxwK2SzUWbg5Q4P5vsHwxzv7Edw4S2CZ0Bg4hICJhrkqSJqiKLGT+t1Kdk+3rpY2z++fLXJ3lT+Jf1yU3T72+6/ETD6++fKV6hjJoRhipSIgKh/lBg13CB9MHYsh7x+jjksdA4Ok58xXrmzn87CUM+ywc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862854; c=relaxed/simple; bh=7Df2gMCwHySOM5tzzLwMPrmlUXYyTp68cLZgj5pJeVo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=kTBontML5X0QjfRS2dtd4CH4/5jmXvvTxmp3OIAirtFetryE9qKG1QGQrRBqPUmzTxoe3t1b99HZZvOgtt4Yz1QoCy5ShLf32fl5W4pdt0t44RjjajIsLiLKO8QgQHaRMbiA/vJbRFFlkEynOzfO078tQg5ItmNfn8T611a7OYw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=MjTpkg2g; arc=none smtp.client-ip=209.85.219.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MjTpkg2g" Received: by mail-qv1-f49.google.com with SMTP id 6a1803df08f44-8b7f937ef44so55076996d6.0 for ; Fri, 15 May 2026 09:34:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778862851; x=1779467651; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=6NAfPYKbFnWXLt9agv/gcIEWKO0+qxbRSgNKDk/o5mk=; b=MjTpkg2gLh/Syl0Q2c9bxqsa/eS5yD/E2ORxg6yeAytGfD9byfv9AN/Upk2AmSQkrC f4qCxnanQFk3n7P8FgizLycRkdgSlk38jawOc5TLNDY8sixqLUE2S+LgdjRPsHiQgWk3 Quzi7Z1+6CqKa8BwWIOlMK4SbCEj1BQ8WeKuqvaJI9BUx1y/f6G2o3JZaJDYOthzWUqG zvkCcKei190ee+akcTJs6aVS5qWddqnQfN/lFBwxCQWUjTh0t8ipZZwAtZ4yOgnYrUOR aNYRaZZMbsdnWq9rCb+yHk/34ISvmUHDcC1s20VZOtk8UZmfhmITIn1Mmu6DQPyb3ZYa pIAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778862851; x=1779467651; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=6NAfPYKbFnWXLt9agv/gcIEWKO0+qxbRSgNKDk/o5mk=; b=YY7pNvRG9qlkHskjokdRBnuNuw/FddiSdg8niaf6uOeYe/3ggYZDD7Vl+mbsV2EkuL Exhg0R9fF22T7PfofR23fvV+mghsfjQqZtDagR7CRUzbmwY98qAwaQtr5mUMEo9Tmz3Y v5PdYx352y6E1Xar5ojiQGPYhfOIsBCErpQkWOMtk2h4zWpyElBz1q3z8ZJJ4rVssbT7 mKGuVT9DcZIWz/3L1E01vSZbim78K4OX9Fd3eGevEketBsv4jUCOCClDtg5Ug77ZYKnm cYw9ooTCqkw+UuYgdifKMr3ffqgueY0XpoHY79SMNLw4xfZEGvgOSjFY2vItwOtrSU25 T+rg== X-Forwarded-Encrypted: i=1; AFNElJ8NV5OCGIbKhf9EPgRaketka5pwAW3/TnMygMfC0rj6ovvploLBEbjep3hk5yBPnkrQulvKsMxaBatqSTk=@vger.kernel.org X-Gm-Message-State: AOJu0YwxRVWkBwEBOdhdHQlyQmZkTqqOEohBZFytMyqdlqZ9gLKOBqVs +YtyDXmtVfBlA/kLqxTcDWlOdFq9P97LzF9f8ZgxIkoiUURe78O8R2Qk X-Gm-Gg: Acq92OHPU0oL82W0g2wxlvUy/QYQZSkb11cKvzLl5cXGUGT29/oxaRGkGKI4wgg4AOo O1VsabdQzcmyKXiOj5/mwDv1SWSOyV1oTcHJTmPefHy/Qu2GxXfc6J0tpMj4ktc8yOtxFD67Whv VMHR/2Ne6ofdA3eNKabfIm4AQCoDDMDal+esZKOG9utAm9S7yd38lbnXaMaHABuOsvXCYsCFBs1 Jq7B+dAelcODMwiAoh+RcIiY+xjQJkvFzzseYN+NW5dRPYyRVJ71ySKfRVeXxOqwfsiOsDY3azO XtXRTaK4oHgJ5p/OURJfBx5GsFUGGZQWjcOf46DARH0FQ95y9cPU6FR8p8zlOCv+oo9+WNDlixB rr17p79XoU1gTKRPre9X1US7PRL7JmX6ncQRaYPcErMJfLldpXPOJ3YwjZVjAdjk0O0okJXPqnC CXX/Z6SsjcWITNlm+3NMBpdmhLYYANokio/g8nFrFrFm5Yv8xx5sUbYEFD/OSIhk+GH6DGpx/pH KFVfaAu+0F2Z4Ron9TVV9gkYJW5mE/ZO/6Lzx/Q8QJpTiz+TtuvAw== X-Received: by 2002:a05:6214:4384:b0:8ca:174d:187a with SMTP id 6a1803df08f44-8ca174d1b42mr42827216d6.15.1778862850633; Fri, 15 May 2026 09:34:10 -0700 (PDT) Received: from server0.tail6e7dd.ts.net (c-68-48-65-54.hsd1.mi.comcast.net. [68.48.65.54]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8c90874e4besm55861956d6.2.2026.05.15.09.34.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 May 2026 09:34:10 -0700 (PDT) From: Michael Bommarito To: Konstantin Komarov Cc: ntfs3@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman Subject: [PATCH] fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass Date: Fri, 15 May 2026 12:34:05 -0400 Message-ID: <20260515163405.1574574-1-michael.bommarito@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7bit In log_replay()'s analysis pass, after find_dp() returns a valid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple, the copy_lcns block walks lrh->lcns_follow further entries: t16 = le16_to_cpu(lrh->lcns_follow); for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); dp->page_lcns[j + i] = lrh->page_lcns[i]; } find_dp() only validates that target_vcn falls within [dp->vcn, dp->vcn + dp->lcns_follow), i.e., that the FIRST cluster is covered. The walk through the further entries is not bounded against dp->lcns_follow. For a malformed LRH where target_vcn = dp->vcn + dp->lcns_follow - 1 and lrh->lcns_follow > 1, the i > 0 writes overflow the dp's allocated page_lcns[] array. Add the missing j + lrh->lcns_follow <= dp->lcns_follow guard. Reproduced under UML+KASAN on mainline 8d90b09e6741 as a slab-out-of-bounds write of size 8 from log_replay+0x68d4 on the mount path. This is distinct from Pavitra Jha's 2026-05-02 patch ("fs/ntfs3: validate lcns_follow in log_replay conversion", <20260502154252.164586-1-jhapavitra98@gmail.com>) which addresses the separate version-0 dirty-page-table conversion path's memmove(&dp->vcn, ...) call. The two fixes are complementary; both should land. Fixes: b46acd6a6a62 ("fs/ntfs3: Add NTFS journal") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito --- fs/ntfs3/fslog.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c index acfa18b84401e..f409611f2530d 100644 --- a/fs/ntfs3/fslog.c +++ b/fs/ntfs3/fslog.c @@ -4547,6 +4547,19 @@ int log_replay(struct ntfs_inode *ni, bool *initialized) * whole routine a loop, case Lcns do not fit below. */ t16 = le16_to_cpu(lrh->lcns_follow); + /* + * find_dp() only validates that target_vcn is the first + * cluster covered by dp. The walk through lrh->lcns_follow + * further entries must stay within the allocated + * dp->page_lcns[] array, which is sized by dp->lcns_follow. + */ + if (le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn) + t16 > + le32_to_cpu(dp->lcns_follow)) { + err = -EINVAL; + log->set_dirty = true; + goto out; + } + for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); -- 2.53.0