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Tue, 24 Mar 2026 22:03:18 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, roberto.sassu@huawei.com, Stefan Berger Subject: [ima-evm-utils: PATCH 3/8] Implement support for EVM signatures V3 signing scheme Date: Tue, 24 Mar 2026 18:03:09 -0400 Message-ID: <20260324220314.743709-4-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260324220314.743709-1-stefanb@linux.ibm.com> References: <20260324220314.743709-1-stefanb@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI0MDE2OCBTYWx0ZWRfX0URpV4yrRv6f Xhu4H76MoCu+wLRA6J2PCPAsOVLRdTvpfby0NPoC1c93Bc5pQYx02K2ttD/B5H/g4MZwuT8PKI0 8qN+Y1WT1TarW1HSMNP+gJWu/LRFxnpBAfNlGdW3VSYbxE/B80zyEPX62i7h7Rebdmmiwf2Sn9P WmHOTajKt2HT9rmZkR9vllcR2rkoIcLbvFWS2dgkhlfgZHche5vIMotGJbh8CZAmQZoMPpUDABQ B1Z53mCKzTXReCM5w/l1QoE120CC7L2Ok0bs8LZ7xyGzEa4N7o+vCttKEYYVqbAF8bmevgospPY AaIbXL49rCsG0/nXbhgrejZaPYeKzQ6/kTJdc8lNlPjuuM4ECfgmbdQi+YRcEXgr5aFegHPRT40 yeg3B3AD7LJqTiqmZDD7JiUzVjNM8bCCZc/T2Jr9wN2ovf52+640VPjBFSEBKbTjRXTEvzPWCu6 7fPXFvqXPoDERBQa44Q== X-Authority-Analysis: v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c30a28 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=onSM0Qx_BTKqystz1eMA:9 X-Proofpoint-ORIG-GUID: yxj_bE_xfo2KwMLRH6oKLRp9JMonQiZH X-Proofpoint-GUID: yxj_bE_xfo2KwMLRH6oKLRp9JMonQiZH 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_03,2026-03-24_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-2603240168 Add support for creating EVM signatures with the V3 signing scheme. Implement the SIGNATURE_v3 case where necessary for EVM. Signed-off-by: Stefan Berger --- src/evmctl.c | 45 +++++++++++++++++++++++++++++++-------------- 1 file changed, 31 insertions(+), 14 deletions(-) diff --git a/src/evmctl.c b/src/evmctl.c index 8b44ee0..aab5af9 100644 --- a/src/evmctl.c +++ b/src/evmctl.c @@ -564,8 +564,10 @@ out: static int sign_evm(const char *file, char *hash_algo, const char *key) { - unsigned char hash[MAX_DIGEST_SIZE]; unsigned char sig[MAX_SIGNATURE_SIZE]; + unsigned char hash[MAX_DIGEST_SIZE]; + enum evm_ima_xattr_type xattr_type; + unsigned char *psig; size_t len; int err; @@ -575,22 +577,37 @@ static int sign_evm(const char *file, char *hash_algo, const char *key) len = (size_t)err; assert(len <= sizeof(hash)); - err = imaevm_signhash(hash_algo, hash, len, key, g_keypass, - sig + 1, sigflags, &access_info, imaevm_keyid); - if (err <= 1) - return err; - len = (size_t)err; - assert(len <= sizeof(sig)); - - /* add header */ - len++; if (evm_portable) - sig[0] = EVM_XATTR_PORTABLE_DIGSIG; + xattr_type = EVM_XATTR_PORTABLE_DIGSIG; else - sig[0] = EVM_IMA_XATTR_DIGSIG; + xattr_type = EVM_IMA_XATTR_DIGSIG; - if (evm_immutable) - sig[1] = 3; /* immutable signature version */ + switch (g_signature_version) { + case SIGNATURE_V3: + psig = sig; + err = imaevm_create_sigv3(hash_algo, hash, len, key, g_keypass, + &psig, sizeof(sig), sigflags, + xattr_type, &access_info, + imaevm_keyid); + if (err <= 1) + return err; + len = (size_t)err; + assert(len <= sizeof(sig)); + break; + case SIGNATURE_V2: + err = imaevm_signhash(hash_algo, hash, len, key, g_keypass, + sig + 1, sigflags, &access_info, imaevm_keyid); + if (err <= 1) + return err; + len = (size_t)err; + assert(len <= sizeof(sig)); + /* add header */ + len++; + sig[0] = xattr_type; + if (evm_immutable) + sig[1] = 3; /* immutable signature version */ + break; + } if (sigdump || imaevm_params.verbose >= LOG_INFO) imaevm_hexdump(sig, len); -- 2.53.0