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Mon, 24 Aug 2020 13:02:23 +0000 (GMT) Received: from sig-9-65-254-31.ibm.com (unknown [9.65.254.31]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 24 Aug 2020 13:02:23 +0000 (GMT) Message-ID: Subject: Re: [PATCH 10/11] ima: Don't ignore errors from crypto_shash_update() From: Mimi Zohar To: Roberto Sassu , mjg59@google.com Cc: linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, silviu.vlasceanu@huawei.com, stable@vger.kernel.org Date: Mon, 24 Aug 2020 09:02:22 -0400 In-Reply-To: <20200618160458.1579-10-roberto.sassu@huawei.com> References: <20200618160329.1263-2-roberto.sassu@huawei.com> <20200618160458.1579-10-roberto.sassu@huawei.com> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.28.5 (3.28.5-12.el8) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-24_11:2020-08-24,2020-08-24 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 malwarescore=0 adultscore=0 bulkscore=0 mlxscore=0 impostorscore=0 suspectscore=3 phishscore=0 mlxlogscore=909 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008240099 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2020-06-18 at 18:04 +0200, Roberto Sassu wrote: > Errors returned by crypto_shash_update() are not checked in > ima_calc_boot_aggregate_tfm() and thus can be overwritten at the next > iteration of the loop. This patch adds a check after calling > crypto_shash_update() and returns immediately if the result is not zero. > > Cc: stable@vger.kernel.org > Fixes: 3323eec921efd ("integrity: IMA as an integrity service provider") > Signed-off-by: Roberto Sassu Verification of the boot_aggregate will fail, but yes this should be fixed. This patch and the next should be moved up front to the beginning of the patch set. Reviewed-by: Mimi Zohar thanks, Mimi