From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail3-163.sinamail.sina.com.cn (mail3-163.sinamail.sina.com.cn [202.108.3.163]) (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 463F837C926 for ; Thu, 17 Sep 2026 01:53:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789610019; cv=none; b=lt8voQkrSmBew1ICdTj/ivQ952KDXD/374TfgVTbwYTl/CHzShkhlznVvl4wCgU5WlUxHR4y6B2unsPeCv/vlZaGb4tUgTuQjcR9kjVmxdwAgk1QXIZmfzll7XJOEMi3SvJEGAcvyc7xrkx80Q5yDl/ZuE3GCkh7c3heD4tqCUQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789610019; c=relaxed/simple; bh=EaVqbU292AuwFapuxfN5YLIJ2O/is7JX1+jkZo2tIEA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HNySsSOOkJ9z5NQ61OvBtlQ/SsXGFnvfXuYla4q+jggfRD4Op0ncae6vpiHVl2S04yPA5jQdiq/cPl2AcXFInCWmgk7n/z+T0gvAEUH0IEd4VmZ5G8pqk8IQYoUZqctSLjYM4bgtJ6PbqEf10uJwxOX8a1fgfnsxmxhHvfxzZjM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=y5RDj7HQ; arc=none smtp.client-ip=202.108.3.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="y5RDj7HQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1789610014; bh=RPtoNEV3Z+3HyCcwmOrt2r9tq2v8XBZbH0LahDXUOg0=; h=From:Subject:Date:Message-ID; b=y5RDj7HQqJlFauDXKQbC49yHyzO0Jxq5vLoc71Qc043alrBCiAHrcGxKI1IFtovNK IqWQkMLDlzMhM3VQ7uXu1wVuJzJ7jPQ8t8haiLDQG+ZGDsBa7FwmdpOIIBf569DUiw 3E04IPyMPTQnscCG9/i1aht2sTTS/63tLVksUgvQ= X-SMAIL-HELO: lxu-ped-host.. Received: from unknown (HELO lxu-ped-host..)([111.198.231.89]) by sina.com (10.54.253.34) with ESMTP id 6AAB481200004D4E; Thu, 17 Sep 2026 09:53:24 +0800 (CST) X-Sender: eadavis@sina.com X-Auth-ID: eadavis@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=eadavis@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=eadavis@sina.com X-SMAIL-MID: 7947856291846 X-SMAIL-UIID: 094AA82588364CB7B8349FCABCB040D1-20260917-095324-1 From: Edward Adam Davis To: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key Date: Thu, 17 Sep 2026 09:53:17 +0800 Message-ID: <20260917015317.975430-1-eadavis@sina.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <6aaabb70.86093f18.33004f.0003.GAE@google.com> References: <6aaabb70.86093f18.33004f.0003.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Edward Aadm Davis #syz test: upstream f6e7b42bf05b diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c index 6f88b507f927..6bf3e2da7bda 100644 --- a/security/keys/user_defined.c +++ b/security/keys/user_defined.c @@ -61,7 +61,8 @@ int user_preparse(struct key_preparsed_payload *prep) struct user_key_payload *upayload; size_t datalen = prep->datalen; - if (datalen == 0 || datalen > 32767 || !prep->data) + if (datalen == 0 || datalen > 32767 || datalen < sizeof(*upayload) || + !prep->data) return -EINVAL; upayload = kmalloc_flex(*upayload, data, datalen);