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Thu, 15 May 2025 02:38:55 -0700 (PDT) From: Ross Lagerwall To: xen-devel@lists.xenproject.org Cc: Ross Lagerwall , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v2 4/5] livepatch: Load built-in key during boot Date: Thu, 15 May 2025 10:38:19 +0100 Message-ID: <20250515093822.659916-5-ross.lagerwall@citrix.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250515093822.659916-1-ross.lagerwall@citrix.com> References: <20250515093822.659916-1-ross.lagerwall@citrix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1747301955025116600 Content-Type: text/plain; charset="utf-8" Parse the raw data of the embedded RSA key into a form that can be later used for verifying live patch signatures. Signed-off-by: Ross Lagerwall --- In v2: * Split out from "livepatch: Embed public key in Xen" xen/common/livepatch.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c index be9b7e367553..bc158971b4bf 100644 --- a/xen/common/livepatch.c +++ b/xen/common/livepatch.c @@ -11,6 +11,8 @@ #include #include #include +#include +#include #include #include #include @@ -73,6 +75,10 @@ static struct livepatch_work livepatch_work; static DEFINE_PER_CPU(bool, work_to_do); static DEFINE_PER_CPU(struct tasklet, livepatch_tasklet); =20 +#ifdef CONFIG_PAYLOAD_VERIFY +static struct rsa_public_key builtin_payload_key; +#endif + static int get_name(const struct xen_livepatch_name *name, char *n) { if ( !name->size || name->size > XEN_LIVEPATCH_NAME_SIZE ) @@ -2287,6 +2293,31 @@ static void cf_check livepatch_printall(unsigned cha= r key) spin_unlock(&payload_lock); } =20 +static int __init load_builtin_payload_key(void) +{ +#ifdef CONFIG_PAYLOAD_VERIFY + const uint8_t *ptr; + uint32_t len; + + rsa_public_key_init(&builtin_payload_key); + + ptr =3D xen_livepatch_key_data; + + memcpy(&len, ptr, sizeof(len)); + ptr +=3D sizeof(len); + builtin_payload_key.n =3D mpi_read_raw_data(ptr, len); + ptr +=3D len; + + memcpy(&len, ptr, sizeof(len)); + ptr +=3D sizeof(len); + builtin_payload_key.e =3D mpi_read_raw_data(ptr, len); + + return rsa_public_key_prepare(&builtin_payload_key); +#else + return 0; +#endif +} + static int cf_check cpu_callback( struct notifier_block *nfb, unsigned long action, void *hcpu) { @@ -2305,6 +2336,11 @@ static struct notifier_block cpu_nfb =3D { static int __init cf_check livepatch_init(void) { unsigned int cpu; + int err; + + err =3D load_builtin_payload_key(); + if (err) + return err; =20 for_each_online_cpu ( cpu ) { --=20 2.49.0