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Thu, 5 Nov 2026 12:12:31 +0000 (GMT) Received: from li-43857255-d5e6-4659-90f1-fc5cee4750ad.ibm.com.com (unknown [9.61.54.214]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 5 Nov 2026 12:12:30 +0000 (GMT) From: Mimi Zohar To: linux-integrity@vger.kernel.org Cc: Mimi Zohar , Jarkko Sakkinen , David Howells , Roberto Sassu , keyrings@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 0/3] ima: use the system blacklist in lieu of the IMA blacklist keyring Date: Thu, 5 Nov 2026 07:12:24 -0500 Message-ID: <20261105121227.4089147-1-zohar@linux.ibm.com> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: STcF29WCR2h3a8WENpf03rNAyg0AfHVO X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA1MDA0NiBTYWx0ZWRfX3eVu9aUaO4Mt pkUW9hUksmLRFTTy9icns1Ju6FXVpduyFdJl+0ScgveYyCHYKz71N8K194figW3kFb5+aPpqFl8 LVKSIORZdBzbL78CIjnDDXy3HND65VY= X-Authority-Analysis: v=2.4 cv=LokHWXdc c=1 sm=1 tr=0 ts=6aec72b3 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=E4YdAB1t0zyyqKEc0TgA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA1MDA0NiBTYWx0ZWRfX8aHZjtEpKhCM wP36jYEQ+MIfoSCkTJbg3X22quBFWLHNvgPiZdPnziTFTkeYTRflrdDoMPw+tnvanNn/vOGCKpo Oa3Me3PYZqZcXY+ZHvQZpxadwECA/2dDDANezUhPros0TJFvkPh5QbnyPbngSWzxBhaY8HmY7yE 7lo8/QyQx72wRhBDvw+V3iKcqUtMlWVpuCKZhxjJp0l3Qzmk2sOiIfN1F4E5ls0NuVFGiD2JLOQ gzYGL0QMWNc1d+qSzE0jkOnQChbULhWADFrxTl8UicDrDZBP9FHtxH4ctyAsuvsbNZrfh27Jf2p EAFTv3pCz1FT142EtRDLofI1dZHznAKvtsXYXCEi/CX3iqFm7utq6GgxlpALVskYhGvm7bpMj/s zlLTFmxdGpoEezXUUg0wWIv9W3xAxw7c5Y8kybZgTaMDhIbhrbZVXl0SvasmopU5YaSMFN5HczM ao3sRF2F1j3t6JmFwgg== X-Proofpoint-GUID: STcF29WCR2h3a8WENpf03rNAyg0AfHVO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-05_03,2026-11-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 clxscore=1011 impostorscore=0 priorityscore=1501 suspectscore=0 phishscore=0 malwarescore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611050046 The experimental IMA blacklist keyring accepts any certificate signed by a key on the builtin trusted keyring. The certificate being revoked was created by such a key, so root can add it to the blacklist. Nothing differentiates the authority to sign from the authority to revoke. The system blacklist already supports signed updates (CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE), but cannot revoke a key that is already loaded on a keyring. This series defines "skid:" entries and adds is_key_blacklisted() to the system blacklist, has IMA's asymmetric_verify() call it on the key it finds, and removes the IMA blacklist keyring. 1/3 certs: blacklist: define skid: entries and add is_key_blacklisted() 2/3 integrity: use is_key_blacklisted() in asymmetric_verify() 3/3 ima: remove the experimental IMA blacklist keyring Revocations for keys on the IMA keyring are now "skid:" entries in the system blacklist. Signed-off-by: Mimi Zohar Mimi Zohar (3): certs: blacklist: define skid: entries and add is_key_blacklisted() integrity: use is_key_blacklisted() in asymmetric_verify() ima: remove the experimental IMA blacklist keyring certs/Kconfig | 7 ++- certs/blacklist.c | 81 ++++++++++++++++++-------- include/keys/system_keyring.h | 22 +++---- security/integrity/digsig_asymmetric.c | 25 ++++---- security/integrity/ima/Kconfig | 13 +---- security/integrity/ima/Makefile | 1 - security/integrity/ima/ima_mok.c | 49 ---------------- 7 files changed, 82 insertions(+), 116 deletions(-) delete mode 100644 security/integrity/ima/ima_mok.c -- 2.56.0