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Thu, 2 Apr 2026 22:15:24 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 04A935805D; Thu, 2 Apr 2026 22:15:23 +0000 (GMT) Received: from fedora-workstation.ibmuc.com (unknown [9.61.183.185]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 2 Apr 2026 22:15:22 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=LX1Olh/npG89T/DAS BPIzEI0pH8oE5W2ilQaiFHLgBo=; b=J2bivI4PSnyQzhGVEXWzePYoJ0a9qOc// XutH5Qx8REa0S4zQcbVBvqownM48Aze+3lCqib2Wi4tdG+ZIIlzUZz8Z9yhBO0BY Cuj/mMgVw9Cu0lm/YmS0sN+Jen5drAavTr4a1T8lmFndlUlsV+uPA3H8Ww/iUSku /fVVopQiSFwseufnA2YUPhlIPSQjVOpokluMfCQAK8zPy26EhcajK7htIvQaEUDA CVhbf5P8g1xpBAifCkxPuEkUpeqfDRR8eVLETB3Xo6pPo71hrDdwHhxscgH11WWr YPUaEjPgovdxCmxCgrWKSnuKHwcX9Lx7mSi7cFasbcwdn76skavFg== From: Zhuoying Cai To: qemu-s390x@nongnu.org, qemu-devel@nongnu.org Cc: jrossi@linux.ibm.com, cohuck@redhat.com, berrange@redhat.com, richard.henderson@linaro.org, pierrick.bouvier@linaro.org, david@kernel.org, walling@linux.ibm.com, jjherne@linux.ibm.com, pasic@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com, mjrosato@linux.ibm.com, iii@linux.ibm.com, eblake@redhat.com, armbru@redhat.com, zycai@linux.ibm.com, alifm@linux.ibm.com, brueckner@linux.ibm.com, jdaley@linux.ibm.com Subject: [PATCH v10 12/30] s390x/diag: Implement DIAG 508 subcode 1 for signature verification Date: Thu, 2 Apr 2026 18:14:34 -0400 Message-ID: <20260402221453.1602899-13-zycai@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260402221453.1602899-1-zycai@linux.ibm.com> References: <20260402221453.1602899-1-zycai@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=J6enLQnS c=1 sm=1 tr=0 ts=69ceea7e cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=20KFwNOVAAAA:8 a=K66z3tz1c1WH2lCF3KIA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDE5NSBTYWx0ZWRfX8f9OsIOzC1CG Mi0aQC4/+v8AAw1797NCMFEbvz/YQ6JMfMG8Kv/79gSmQhNdM8akiO/6dPLTc0ld4w6t1B9H1GZ omDVh2Lgi0io9ZzN/7LGpFN9CfABggB0c5GgcXqP9/bEoQ/HJNlWqB6uJ4mpNR6LXVuqmx5vEL8 6c/fumpTe4kAG7oYelhNU3eDanTDhV6c2uuSJw2660Dztax5LRCsFQ4Ooi6xQWLiIhKtzZK6o4z yKERGLqpORP57a6THNB1lkyry3ug+XzbXFxbgv34J1wXZSh0XzUSjkrx4Sev/WTK/QD6ijtr/Gu pL5ywywhmiTo+0CNnafmsfKNJnX7kePvgvUqcyVY2q/PUAt/NQJgTSV6bEUyiQPlSrslf26iryf QrZ5Qb44XmOSNSmsZIVr+bwDSJzF6DVtxNJnFb52sMhR9yRkyk6H3isuPEqbeAhz2GbbWAfJ7mg Bw2kYVSQg7pPp6ZN4Qw== X-Proofpoint-GUID: kc4o_cTgbMvmu2OluGjlJ_e38Lk0adMi X-Proofpoint-ORIG-GUID: kc4o_cTgbMvmu2OluGjlJ_e38Lk0adMi 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=2026-04-02_04,2026-04-02_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 adultscore=0 priorityscore=1501 bulkscore=0 phishscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020195 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Collin Walling DIAG 508 subcode 1 performs signature-verification on signed components. A signed component may be a Linux kernel image, or any other signed binary. **Verification of initrd is not supported.** The instruction call expects two item-pairs: an address of a device component, an address of the analogous signature file (in PKCS#7 DER format= ), and their respective lengths. All of this data should be encapsulated within a Diag508SigVerifBlock. The DIAG handler will read from the provided addresses to retrieve the necessary data, parse the signature file, then perform the signature-verification. Because there is no way to correlate a specific certificate to a component, each certificate in the store is tried until either verification succeeds, or all certs have been exhausted. A return code of 1 indicates success, and the index and length of the corresponding certificate will be set in the Diag508SigVerifBlock. The following values indicate failure: 0x0102: no certificates are available in the store 0x0202: component data is invalid 0x0302: PKCS#7 format signature is invalid 0x0402: signature-verification failed 0x0502: length of Diag508SigVerifBlock is invalid Signed-off-by: Collin Walling Signed-off-by: Zhuoying Cai Reviewed-by: Thomas Huth Reviewed-by: Farhan Ali --- docs/specs/s390x-secure-ipl.rst | 17 +++++ include/hw/s390x/ipl/diag508.h | 30 +++++++++ target/s390x/diag.c | 111 +++++++++++++++++++++++++++++++- 3 files changed, 157 insertions(+), 1 deletion(-) diff --git a/docs/specs/s390x-secure-ipl.rst b/docs/specs/s390x-secure-ipl.= rst index 83feb5d6b5..0ea4522894 100644 --- a/docs/specs/s390x-secure-ipl.rst +++ b/docs/specs/s390x-secure-ipl.rst @@ -80,3 +80,20 @@ that requires assistance from QEMU. =20 Subcode 0 - query installed subcodes Returns a 64-bit mask indicating which subcodes are supported. + +Subcode 1 - perform signature verification + Perform signature-verification on a signed component, using certificat= es + from the certificate store and leveraging qcrypto libraries to perform + this operation. + + Note: verification of initrd is not supported. + + A return code of 1 indicates success, and the index and length of the + corresponding certificate will be set in the Diag508SigVerifBlock. + The following values indicate failure: + + * ``0x0102``: no certificates are available in the store + * ``0x0202``: component data is invalid + * ``0x0302``: PKCS#7 format signature is invalid + * ``0x0402``: signature-verification failed + * ``0x0502``: length of Diag508SigVerifBlock is invalid diff --git a/include/hw/s390x/ipl/diag508.h b/include/hw/s390x/ipl/diag508.h index 6281ad8299..8a147f32a0 100644 --- a/include/hw/s390x/ipl/diag508.h +++ b/include/hw/s390x/ipl/diag508.h @@ -11,5 +11,35 @@ #define S390X_DIAG508_H =20 #define DIAG_508_SUBC_QUERY_SUBC 0x0000 +#define DIAG_508_SUBC_SIG_VERIF 0x8000 + +#define DIAG_508_RC_OK 0x0001 +#define DIAG_508_RC_NO_CERTS 0x0102 +#define DIAG_508_RC_INVAL_COMP_DATA 0x0202 +#define DIAG_508_RC_INVAL_PKCS7_SIG 0x0302 +#define DIAG_508_RC_FAIL_VERIF 0x0402 +#define DIAG_508_RC_INVAL_LEN 0x0502 + +/* + * Maximum componenet and signature sizes for current secure boot implemen= tation + * Not architecturally defined and may need to revisit if increased + */ +#define DIAG_508_MAX_COMP_LEN 0x10000000 +#define DIAG_508_MAX_SIG_LEN 4096 + +struct Diag508SigVerifBlock { + uint32_t length; + uint8_t reserved0[3]; + uint8_t version; + uint32_t reserved[2]; + uint8_t cert_store_index; + uint8_t reserved1[7]; + uint64_t cert_len; + uint64_t comp_len; + uint64_t comp_addr; + uint64_t sig_len; + uint64_t sig_addr; +}; +typedef struct Diag508SigVerifBlock Diag508SigVerifBlock; =20 #endif diff --git a/target/s390x/diag.c b/target/s390x/diag.c index 343a1fa584..26b88926a9 100644 --- a/target/s390x/diag.c +++ b/target/s390x/diag.c @@ -637,9 +637,110 @@ void handle_diag_320(CPUS390XState *env, uint64_t r1,= uint64_t r3, uintptr_t ra) } } =20 +static bool diag_508_verify_sig(uint8_t *cert, size_t cert_size, + uint8_t *comp, size_t comp_size, + uint8_t *sig, size_t sig_size) +{ + g_autofree uint8_t *sig_pem =3D NULL; + size_t sig_size_pem; + int rc; + + /* + * PKCS#7 signature with DER format + * Convert to PEM format for signature verification + * + * Ignore errors during qcrypto signature format conversion and verifi= cation + * Return false on any error, treating it as a verification failure + */ + rc =3D qcrypto_pkcs7_convert_sig_pem(sig, sig_size, &sig_pem, &sig_siz= e_pem, NULL); + if (rc < 0) { + return false; + } + + rc =3D qcrypto_x509_verify_sig(cert, cert_size, + comp, comp_size, + sig_pem, sig_size_pem, NULL); + if (rc < 0) { + return false; + } + + return true; +} + +static int handle_diag508_sig_verif(uint64_t addr) +{ + int verified; + uint32_t svb_len; + uint64_t comp_len, comp_addr; + uint64_t sig_len, sig_addr; + g_autofree uint8_t *comp =3D NULL; + g_autofree uint8_t *sig =3D NULL; + g_autofree Diag508SigVerifBlock *svb =3D NULL; + size_t svb_size =3D sizeof(Diag508SigVerifBlock); + S390IPLCertificateStore *cs =3D s390_ipl_get_certificate_store(); + + if (!cs->count) { + return DIAG_508_RC_NO_CERTS; + } + + svb =3D g_new0(Diag508SigVerifBlock, 1); + cpu_physical_memory_read(addr, svb, svb_size); + + svb_len =3D be32_to_cpu(svb->length); + if (svb_len !=3D svb_size) { + return DIAG_508_RC_INVAL_LEN; + } + + comp_len =3D be64_to_cpu(svb->comp_len); + comp_addr =3D be64_to_cpu(svb->comp_addr); + sig_len =3D be64_to_cpu(svb->sig_len); + sig_addr =3D be64_to_cpu(svb->sig_addr); + + if (!comp_len || !comp_addr || comp_len > DIAG_508_MAX_COMP_LEN) { + if (comp_len > DIAG_508_MAX_COMP_LEN) { + warn_report("DIAG 0x508: component length %lu exceeds current = maximum %u", + comp_len, DIAG_508_MAX_COMP_LEN); + } + return DIAG_508_RC_INVAL_COMP_DATA; + } + + if (!sig_len || !sig_addr || sig_len > DIAG_508_MAX_SIG_LEN) { + if (sig_len > DIAG_508_MAX_SIG_LEN) { + warn_report("DIAG 0x508: signature length %lu exceeds current = maximum %u", + sig_len, DIAG_508_MAX_SIG_LEN); + } + return DIAG_508_RC_INVAL_PKCS7_SIG; + } + + comp =3D g_malloc0(comp_len); + cpu_physical_memory_read(comp_addr, comp, comp_len); + + sig =3D g_malloc0(sig_len); + cpu_physical_memory_read(sig_addr, sig, sig_len); + + for (int i =3D 0; i < cs->count; i++) { + verified =3D diag_508_verify_sig(cs->certs[i].raw, + cs->certs[i].size, + comp, comp_len, + sig, sig_len); + if (verified) { + svb->cert_store_index =3D i; + svb->cert_len =3D cpu_to_be64(cs->certs[i].der_size); + cpu_physical_memory_write(addr, svb, svb_size); + return DIAG_508_RC_OK; + } + } + + return DIAG_508_RC_FAIL_VERIF; +} + +QEMU_BUILD_BUG_MSG(sizeof(Diag508SigVerifBlock) !=3D 64, + "size of Diag508SigVerifBlock is wrong"); + void handle_diag_508(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr= _t ra) { uint64_t subcode =3D env->regs[r3]; + uint64_t addr =3D env->regs[r1]; int rc; =20 if (env->psw.mask & PSW_MASK_PSTATE) { @@ -654,7 +755,15 @@ void handle_diag_508(CPUS390XState *env, uint64_t r1, = uint64_t r3, uintptr_t ra) =20 switch (subcode) { case DIAG_508_SUBC_QUERY_SUBC: - rc =3D 0; + rc =3D DIAG_508_SUBC_SIG_VERIF; + break; + case DIAG_508_SUBC_SIG_VERIF: + if (!diag_parm_addr_valid(addr, sizeof(Diag508SigVerifBlock), true= )) { + s390_program_interrupt(env, PGM_ADDRESSING, ra); + return; + } + + rc =3D handle_diag508_sig_verif(addr); break; default: s390_program_interrupt(env, PGM_SPECIFICATION, ra); --=20 2.53.0