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Wed, 25 Mar 2026 00:15:52 +0000 (GMT) Message-ID: <35f4f73e-e261-4001-814f-4cff6adcd423@linux.ibm.com> Date: Tue, 24 Mar 2026 20:15:52 -0400 Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/3] ima: add regular file data hash support for sigv3 To: Mimi Zohar , linux-integrity@vger.kernel.org Cc: Eric Biggers References: <20260324203929.2475782-1-zohar@linux.ibm.com> Content-Language: en-US From: Stefan Berger In-Reply-To: <20260324203929.2475782-1-zohar@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI0MDE4NCBTYWx0ZWRfX1kDaxaWDgQ8B XTKQhQu/NOWv/HfpHif9FkHX6eituQvgaoDKc2D8dV98Z9pa+0bvtR9ESPS23qideaqNeackiCC rUL4iyo9XlJgNEudbFHTGWR6OuPHTHukxg2mZKPlsxV9fIurMl2mzNFFY4FxS8c+aRXzWR8OTul QBogGIpSR8Qq+FdQOPZp1twXT3Lf89wXQvsL3EvqXAkklCeBMo3l4na4FrujjGwvyMM8yt3K/5W 6Ir4Hlcrr7SjxJdwERED3ehGborb15INd4ppW2NAB5ekgmYpyVKohLNKJB900tu9i65OaE1b/mp gbPjXTuNIeXTbFHXPOAD6nvY3RvtwzKTvOv7hkdC7F2Phfydw3bGwpl34rGxxImY2JhUwHz58GJ QfO0og93FFOhG3Fnnm0Pknv71FzQL+w1wy0BYB4f32YoiFSLrDlEVzITFdiKR8iwNGxU6+/OvlO BthGWpiSWjr/350PsXQ== X-Authority-Analysis: v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c3293b cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=_pRPkOYCL_UPi4XlPFUA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: fiAwczHATlW5SSV5kRCh16iCa5Vakeip X-Proofpoint-GUID: fiAwczHATlW5SSV5kRCh16iCa5Vakeip X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-24_04,2026-03-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 adultscore=0 spamscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603240184 On 3/24/26 4:39 PM, Mimi Zohar wrote: > IMA signature version 3 (sigv3) support was introduced to avoid file > signature ambiguity. Instead of directly signing a raw fs-verity hash, > IMA signs the hash of ima_file_id structure, containing the type of > signature, the hash algorithm, and the hash. > > Pure ML-DSA calculates and signs the hash directly rather than a > pre-hashed digest. To avoid ML-DSA having to re-calculate the file data > hash, Eric Biggers suggested signing the smaller ima_file_id structure. > > This patch set adds the sigv3 support for regular file data hashes. A > subsequent patch set will add the ML-DSA support. > > Mimi Zohar (3): > ima: Define asymmetric_verify_v3() to verify IMA sigv3 signatures > ima: add regular file data hash signature version 3 support > ima: add support to require IMA sigv3 signatures > > Documentation/ABI/testing/ima_policy | 10 ++-- > security/integrity/digsig.c | 8 +-- > security/integrity/digsig_asymmetric.c | 58 +++++++++++++++++++++ > security/integrity/evm/evm_main.c | 3 +- > security/integrity/ima/ima.h | 1 + > security/integrity/ima/ima_appraise.c | 72 ++++++++------------------ > security/integrity/ima/ima_policy.c | 22 ++++---- > security/integrity/integrity.h | 14 ++++- > 8 files changed, 115 insertions(+), 73 deletions(-) > > -- > 2.53.0 > Series: Tested-by: Stefan Berger