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Thu, 2 Apr 2026 22:15:37 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CF95858056; Thu, 2 Apr 2026 22:15:35 +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 22:15:35 +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=d8WRo04U2I5tc2ohS qBiyORmKOI9BWAEVb4AE66V5Q4=; b=bFSqP6AqBpdkH5K+Rq0Zknsm4fT9u3AO0 npHcWD4Tl3fzfnq/TEhN8KWSEsCdmx0MU8gq1LjzSBepwKeaX001BUqN8YzvHIQl 0sfdAcurk2R4mqANTnV2uom3URWWOpCb8ZMGQ6uBpTkPgTP5W+6dh64rESZPTwwu C7x1z4z/6XkqbHccY1vukLjqgjiyv4jnn4KyKYAydZih8BM61xL8JxRfMi/AmZ0/ 4DuiFylElwEQ5KXfgSXD0jptihpQgIcJ8HYXqAwWGIbnUxNQNJPWo5pbMZocdfYE GoiXJNxmIldangMxIJIJX7N0iUQ9RZuT5iLehK/+Kixo80lLG1R4Q== 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 20/30] pc-bios/s390-ccw: Add signed component address overlap checks Date: Thu, 2 Apr 2026 18:14:42 -0400 Message-ID: <20260402221453.1602899-21-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-Proofpoint-GUID: W7GSplnZ2R6YcF0dhtEadSNNoWSUb556 X-Authority-Analysis: v=2.4 cv=KslAGGWN c=1 sm=1 tr=0 ts=69ceea8b cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=id9pkdgl0szQWdF34qoA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDE5NSBTYWx0ZWRfX2MvMoL+m3A2+ vsWADu7xeVK/YgtqMK8KlEQmS2o7oRcf1ApkX1B2SVLkpjS2d0vwV6hAVr9ucC/Zo8uo+fLfboS zb36mnoxT7AkGzINjxLOqA3aDh9tYVFRG21dow1aWlhWBFtVODvzpxPJlZ73dyTt/AlbuCkqbls MChg8UrsgSplOXTTFVhnyx8Sp2SYMbn7CIqoyCGwwrjO/zExioXb1fpizQ0vxuowfcPhz+xJmuS CKObG+1vfyZqLE+7LRlGv7SlafAoseWwvLy/IZpqodNA+Xg4DQI+J80qi2U8ECwPIUbC57JuQA0 XSTRB1S5c52g+UlemIbBdjelasldsm2Pcxo5Qw8+EFaGhIQYrBVtjWoniyO2WVFMaJp83f6HyPJ SQPBMlzwBqBLrNbLQre+LH27jpVUil0LjfE9VFwzC1vvYhMYJBoC0/P7ZIYYh2aXjPG8BVYGw/X a7Dh7pKOMvJT01llzDg== X-Proofpoint-ORIG-GUID: W7GSplnZ2R6YcF0dhtEadSNNoWSUb556 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 malwarescore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1015 spamscore=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" Add address range tracking and overlap checks to ensure that no component overlaps with a signed component during secure IPL. Signed-off-by: Zhuoying Cai --- pc-bios/s390-ccw/secure-ipl.c | 58 ++++++++++++++++++++++++++++++++--- pc-bios/s390-ccw/secure-ipl.h | 15 +++++++++ 2 files changed, 69 insertions(+), 4 deletions(-) diff --git a/pc-bios/s390-ccw/secure-ipl.c b/pc-bios/s390-ccw/secure-ipl.c index b66ca9ca7e..d2079e19bc 100644 --- a/pc-bios/s390-ccw/secure-ipl.c +++ b/pc-bios/s390-ccw/secure-ipl.c @@ -211,6 +211,49 @@ static void init_lists(IplDeviceComponentList *comp_li= st, cert_list->ipl_info_header.len =3D sizeof(cert_list->ipl_info_header); } =20 +static bool is_comp_overlap(SecureIplCompAddrRangeList *range_list, + SecureIplCompEntryInfo comp_entry_info) +{ + uint64_t start_addr; + uint64_t end_addr; + + start_addr =3D comp_entry_info.addr; + end_addr =3D comp_entry_info.addr + comp_entry_info.len; + + /* + * Check component's address range does not overlap with any + * signed component's address range. + */ + for (int i =3D 0; i < range_list->index; i++) { + if ((range_list->comp_addr_range[i].start_addr < end_addr && + start_addr < range_list->comp_addr_range[i].end_addr) && + range_list->comp_addr_range[i].is_signed) { + return true; + } + } + return false; +} + +static void comp_addr_range_add(SecureIplCompAddrRangeList *range_list, + SecureIplCompEntryInfo comp_entry_info, + bool is_signed) +{ + uint64_t start_addr; + uint64_t end_addr; + + start_addr =3D comp_entry_info.addr; + end_addr =3D comp_entry_info.addr + comp_entry_info.len; + + if (range_list->index >=3D MAX_CERTIFICATES) { + zipl_secure_handle("Component address range update failed due to o= ut-of-range" + " index; Overlapping validation cannot be guara= nteed"); + } + + range_list->comp_addr_range[range_list->index].is_signed =3D is_signed; + range_list->comp_addr_range[range_list->index].start_addr =3D start_ad= dr; + range_list->comp_addr_range[range_list->index].end_addr =3D end_addr; +} + static int zipl_load_signature(ComponentEntry *entry, uint64_t sig_sec) { if (zipl_load_segment(entry, sig_sec) < 0) { @@ -253,6 +296,7 @@ int zipl_run_secure(ComponentEntry **entry_ptr, uint8_t= *tmp_sec) * exists for the certificate). */ int cert_list_table[MAX_CERTIFICATES] =3D { [0 ... MAX_CERTIFICATES - = 1] =3D -1 }; + SecureIplCompAddrRangeList range_list =3D { 0 }; int signed_count =3D 0; =20 if (!secure_ipl_supported()) { @@ -282,14 +326,20 @@ int zipl_run_secure(ComponentEntry **entry_ptr, uint8= _t *tmp_sec) goto out; } =20 - if (!sig_len) { - break; - } - comp_entry_info =3D (SecureIplCompEntryInfo){ 0 }; comp_entry_info.addr =3D comp_addr; comp_entry_info.len =3D (uint64_t)comp_len; =20 + if (is_comp_overlap(&range_list, comp_entry_info)) { + zipl_secure_handle("Component addresses overlap"); + } + comp_addr_range_add(&range_list, comp_entry_info, !!sig_len); + range_list.index +=3D 1; + + if (!sig_len) { + break; + } + verified =3D verify_signature(comp_entry_info, sig_len, (uint64_t)sig, &cert_len, &cert_table_idx); diff --git a/pc-bios/s390-ccw/secure-ipl.h b/pc-bios/s390-ccw/secure-ipl.h index 6d65cd5596..c625ac2e3a 100644 --- a/pc-bios/s390-ccw/secure-ipl.h +++ b/pc-bios/s390-ccw/secure-ipl.h @@ -24,6 +24,21 @@ typedef struct SecureIplCompEntryInfo { uint8_t flags; } SecureIplCompEntryInfo; =20 +typedef struct SecureIplCompAddrRange { + bool is_signed; + uint64_t start_addr; + uint64_t end_addr; +} SecureIplCompAddrRange; + +/* + * Custom struct for managing a list of secure IPL component address range= s. + * Tracks up to MAX_CERTIFICATES address ranges with an index counter. + */ +typedef struct SecureIplCompAddrRangeList { + SecureIplCompAddrRange comp_addr_range[MAX_CERTIFICATES]; + int index; +} SecureIplCompAddrRangeList; + static inline void zipl_secure_handle(const char *message) { switch (boot_mode) { --=20 2.53.0