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 D8416168AD for ; Mon, 8 May 2023 10:14:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60130C433EF; Mon, 8 May 2023 10:14:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683540844; bh=R4lh229KMwHKlWfOPkYj+7K0liPIEWqOEljdV5Wc21g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0CqPs4LZNnsnPPXJ5NGOeo0N4fbHT6QTsNyxK0qmlYu6eqmeC1u37PZ4DZzZmFqCh GLzVBEmUsNGoetwTCPj3PpxFtUCdRI4OYXA1zLyXD8aoN5n8w/wosrrsXOh+rUzkir 7fI9Po8Dgme48/qL+275mgANHoW4QQ+G4BCvrfcQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+d882d57193079e379309@syzkaller.appspotmail.com, ZhangPeng , Konstantin Komarov , Sasha Levin Subject: [PATCH 6.1 489/611] fs/ntfs3: Fix OOB read in indx_insert_into_buffer Date: Mon, 8 May 2023 11:45:31 +0200 Message-Id: <20230508094437.964014548@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094421.513073170@linuxfoundation.org> References: <20230508094421.513073170@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: ZhangPeng [ Upstream commit b8c44949044e5f7f864525fdffe8e95135ce9ce5 ] Syzbot reported a OOB read bug: BUG: KASAN: slab-out-of-bounds in indx_insert_into_buffer+0xaa3/0x13b0 fs/ntfs3/index.c:1755 Read of size 17168 at addr ffff8880255e06c0 by task syz-executor308/3630 Call Trace: memmove+0x25/0x60 mm/kasan/shadow.c:54 indx_insert_into_buffer+0xaa3/0x13b0 fs/ntfs3/index.c:1755 indx_insert_entry+0x446/0x6b0 fs/ntfs3/index.c:1863 ntfs_create_inode+0x1d3f/0x35c0 fs/ntfs3/inode.c:1548 ntfs_create+0x3e/0x60 fs/ntfs3/namei.c:100 lookup_open fs/namei.c:3413 [inline] If the member struct INDEX_BUFFER *index of struct indx_node is incorrect, that is, the value of __le32 used is greater than the value of __le32 total in struct INDEX_HDR. Therefore, OOB read occurs when memmove is called in indx_insert_into_buffer(). Fix this by adding a check in hdr_find_e(). Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block") Reported-by: syzbot+d882d57193079e379309@syzkaller.appspotmail.com Signed-off-by: ZhangPeng Signed-off-by: Konstantin Komarov Signed-off-by: Sasha Levin --- fs/ntfs3/index.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c index c27b4fe575136..bdc931990d2cc 100644 --- a/fs/ntfs3/index.c +++ b/fs/ntfs3/index.c @@ -679,9 +679,13 @@ static struct NTFS_DE *hdr_find_e(const struct ntfs_index *indx, u32 e_size, e_key_len; u32 end = le32_to_cpu(hdr->used); u32 off = le32_to_cpu(hdr->de_off); + u32 total = le32_to_cpu(hdr->total); u16 offs[128]; fill_table: + if (end > total) + return NULL; + if (off + sizeof(struct NTFS_DE) > end) return NULL; -- 2.39.2