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[209.132.180.67]) by mx.google.com with ESMTP id h187si5959783pfb.129.2019.05.31.01.26.26; Fri, 31 May 2019 01:26:42 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=U1hw+NrP; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726973AbfEaIY3 (ORCPT + 99 others); Fri, 31 May 2019 04:24:29 -0400 Received: from mail-io1-f67.google.com ([209.85.166.67]:47066 "EHLO mail-io1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726939AbfEaIY2 (ORCPT ); Fri, 31 May 2019 04:24:28 -0400 Received: by mail-io1-f67.google.com with SMTP id u25so7445265iot.13 for ; Fri, 31 May 2019 01:24:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=bext49RkEWjn5e54ds231yaHTTznBDfo62Dw7pohGOU=; b=U1hw+NrP/ST+DGg+0r4IeeXM31Q9ojJkkPUhDe3VXsAWVlhsWCW8DaEzgaIwfqNSNh E8HyIiCIcW2PtkNkDqArlEmjO4Bt6yqd91Dqll+1EvsTppoEOAeaL92RboptOlQLr1Iw 3FvMh7mu9yFfPtkEbv6IINKRYOaXv1mITQgcTKOf+CwoMPlT+xe3K0F23P+Yxjz1RXnL tWINEGIhDfSuv5Yt+ozWdc+AyI80l73Xyjiq4pCh3kg0lTQrtVTrNTvf0D7xoocQoxsj EM1pHiJO9DTexVx5wpwxr3Hx5PygMI/Hg/yob19LKcO4HWJQ8tKjeenOBDvKtXe+q7UR a6IA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=bext49RkEWjn5e54ds231yaHTTznBDfo62Dw7pohGOU=; b=i8g8kzluMl0motHIbfNnspk63Mr3qfX0vEhpITr08jmszGExhP1mf4bukSH3sNIdj4 kNramdNOG2Uhu7uR7OrRiXpfXzFqU86bJDq6Z35lxp4ZDtgeOIBKR4A+WIKqnEVVYCN+ a1uybt0v/zKF/51F1cafpSOsLmYd80XxGOGSHAk4cCuNkidD9p4uAEys+TKWjqwUCCo5 wDJCLcmaFfdRQ+477dZaXrxM4gR/TvOqIs1BpxCO7iSqnxjR9ucyiDWpQ05219un9InV EVuvRMbAbe68B1SUKbea8V5DP3W5PyzmlYNYirZmzL2o2mXbt78q5wbrbLLh/56g7PIv NMxw== X-Gm-Message-State: APjAAAU+c8AcP9D8X0myRQCxFQIFakA+QAlE8409akdJeiyDXqv8OReY OTdGc0o1bLel+AhdlBqWayJphX9qwKPiEPfLYIJ4uA== X-Received: by 2002:a5e:c24b:: with SMTP id w11mr5784887iop.111.1559291066748; Fri, 31 May 2019 01:24:26 -0700 (PDT) MIME-Version: 1.0 References: <20190520205501.177637-1-matthewgarrett@google.com> <20190520205501.177637-3-matthewgarrett@google.com> In-Reply-To: <20190520205501.177637-3-matthewgarrett@google.com> From: Joe Richey Date: Fri, 31 May 2019 01:24:15 -0700 Message-ID: Subject: Re: [PATCH V7 2/4] tpm: Reserve the TPM final events table To: Matthew Garrett Cc: linux-integrity@vger.kernel.org, peterhuewe@gmx.de, jarkko.sakkinen@linux.intel.com, jgg@ziepe.ca, roberto.sassu@huawei.com, linux-efi@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?Q?Thi=C3=A9baud_Weksteen?= , bsz@semihalf.com, Matthew Garrett Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000002fd14f058a2abeee" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000002fd14f058a2abeee Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, May 20, 2019 at 1:55 PM Matthew Garrett wrote: > > From: Matthew Garrett > > UEFI systems provide a boot services protocol for obtaining the TPM > event log, but this is unusable after ExitBootServices() is called. > Unfortunately ExitBootServices() itself triggers additional TPM events > that then can't be obtained using this protocol. The platform provides a > mechanism for the OS to obtain these events by recording them to a > separate UEFI configuration table which the OS can then map. > > Unfortunately this table isn't self describing in terms of providing its > length, so we need to parse the events inside it to figure out how long > it is. Since the table isn't mapped at this point, we need to extend the > length calculation function to be able to map the event as it goes > along. > > (Fixes by Bartosz Szczepanek ) > > Signed-off-by: Matthew Garrett > --- > drivers/char/tpm/eventlog/tpm2.c | 2 +- > drivers/firmware/efi/efi.c | 2 + > drivers/firmware/efi/tpm.c | 62 ++++++++++++++++++- > include/linux/efi.h | 9 +++ > include/linux/tpm_eventlog.h | 102 ++++++++++++++++++++++++++++--- > 5 files changed, 164 insertions(+), 13 deletions(-) > > diff --git a/drivers/char/tpm/eventlog/tpm2.c b/drivers/char/tpm/eventlog= /tpm2.c > index 1a977bdd3bd2..de1d9f7e5a92 100644 > --- a/drivers/char/tpm/eventlog/tpm2.c > +++ b/drivers/char/tpm/eventlog/tpm2.c > @@ -40,7 +40,7 @@ > static size_t calc_tpm2_event_size(struct tcg_pcr_event2_head *event, > struct tcg_pcr_event *event_header) > { > - return __calc_tpm2_event_size(event, event_header); > + return __calc_tpm2_event_size(event, event_header, false); > } > > static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *po= s) > diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c > index 55b77c576c42..6b11c41e0575 100644 > --- a/drivers/firmware/efi/efi.c > +++ b/drivers/firmware/efi/efi.c > @@ -53,6 +53,7 @@ struct efi __read_mostly efi =3D { > .mem_attr_table =3D EFI_INVALID_TABLE_ADDR, > .rng_seed =3D EFI_INVALID_TABLE_ADDR, > .tpm_log =3D EFI_INVALID_TABLE_ADDR, > + .tpm_final_log =3D EFI_INVALID_TABLE_ADDR, > .mem_reserve =3D EFI_INVALID_TABLE_ADDR, > }; > EXPORT_SYMBOL(efi); > @@ -485,6 +486,7 @@ static __initdata efi_config_table_type_t common_tabl= es[] =3D { > {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table= }, > {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed}, > {LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log}, > + {LINUX_EFI_TPM_FINAL_LOG_GUID, "TPMFinalLog", &efi.tpm_final_log}= , > {LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &efi.mem_reserve}= , > {NULL_GUID, NULL, NULL}, > }; > diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c > index 3a689b40ccc0..2c912ea08166 100644 > --- a/drivers/firmware/efi/tpm.c > +++ b/drivers/firmware/efi/tpm.c > @@ -4,34 +4,90 @@ > * Thiebaud Weksteen > */ > > +#define TPM_MEMREMAP(start, size) early_memremap(start, size) > +#define TPM_MEMUNMAP(start, size) early_memunmap(start, size) > + > #include > #include > #include > +#include > > #include > > +int efi_tpm_final_log_size; > +EXPORT_SYMBOL(efi_tpm_final_log_size); > + > +static int tpm2_calc_event_log_size(void *data, int count, void *size_in= fo) > +{ > + struct tcg_pcr_event2_head *header; > + int event_size, size =3D 0; > + > + while (count > 0) { > + header =3D data + size; > + event_size =3D __calc_tpm2_event_size(header, size_info, = true); > + if (event_size =3D=3D 0) > + return -1; > + size +=3D event_size; > + count--; > + } > + > + return size; > +} > + > /* > * Reserve the memory associated with the TPM Event Log configuration ta= ble. > */ > int __init efi_tpm_eventlog_init(void) > { > struct linux_efi_tpm_eventlog *log_tbl; > + struct efi_tcg2_final_events_table *final_tbl; > unsigned int tbl_size; > + int ret =3D 0; > > - if (efi.tpm_log =3D=3D EFI_INVALID_TABLE_ADDR) > + if (efi.tpm_log =3D=3D EFI_INVALID_TABLE_ADDR) { > + /* > + * We can't calculate the size of the final events withou= t the > + * first entry in the TPM log, so bail here. > + */ > return 0; > + } > > log_tbl =3D early_memremap(efi.tpm_log, sizeof(*log_tbl)); > if (!log_tbl) { > pr_err("Failed to map TPM Event Log table @ 0x%lx\n", > - efi.tpm_log); > + efi.tpm_log); > efi.tpm_log =3D EFI_INVALID_TABLE_ADDR; > return -ENOMEM; > } > > tbl_size =3D sizeof(*log_tbl) + log_tbl->size; > memblock_reserve(efi.tpm_log, tbl_size); > + > + if (efi.tpm_final_log =3D=3D EFI_INVALID_TABLE_ADDR) > + goto out; > + > + final_tbl =3D early_memremap(efi.tpm_final_log, sizeof(*final_tbl= )); > + > + if (!final_tbl) { > + pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n= ", > + efi.tpm_final_log); > + efi.tpm_final_log =3D EFI_INVALID_TABLE_ADDR; > + ret =3D -ENOMEM; > + goto out; > + } > + > + tbl_size =3D tpm2_calc_event_log_size(efi.tpm_final_log > + + sizeof(final_tbl->version) > + + sizeof(final_tbl->nr_events= ), This line causes: warning: passing argument 1 of =E2=80=98tpm2_calc_event_log_size=E2=80=99 m= akes pointer from integer without a cast > + final_tbl->nr_events, > + log_tbl->log); > + memblock_reserve((unsigned long)final_tbl, > + tbl_size + sizeof(*final_tbl)); > + early_memunmap(final_tbl, sizeof(*final_tbl)); > + efi_tpm_final_log_size =3D tbl_size; > + > +out: > early_memunmap(log_tbl, sizeof(*log_tbl)); > - return 0; > + return ret; > } > > diff --git a/include/linux/efi.h b/include/linux/efi.h > index 54357a258b35..e33c70a52a9d 100644 > --- a/include/linux/efi.h > +++ b/include/linux/efi.h > @@ -689,6 +689,7 @@ void efi_native_runtime_setup(void); > #define LINUX_EFI_LOADER_ENTRY_GUID EFI_GUID(0x4a67b082, 0x0a= 4c, 0x41cf, 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f) > #define LINUX_EFI_RANDOM_SEED_TABLE_GUID EFI_GUID(0x1ce1e5bc, 0x7c= eb, 0x42f2, 0x81, 0xe5, 0x8a, 0xad, 0xf1, 0x80, 0xf5, 0x7b) > #define LINUX_EFI_TPM_EVENT_LOG_GUID EFI_GUID(0xb7799cb0, 0xec= a2, 0x4943, 0x96, 0x67, 0x1f, 0xae, 0x07, 0xb7, 0x47, 0xfa) > +#define LINUX_EFI_TPM_FINAL_LOG_GUID EFI_GUID(0x1e2ed096, 0x30= e2, 0x4254, 0xbd, 0x89, 0x86, 0x3b, 0xbe, 0xf8, 0x23, 0x25) > #define LINUX_EFI_MEMRESERVE_TABLE_GUID EFI_GUID(0x888eb0= c6, 0x8ede, 0x4ff5, 0xa8, 0xf0, 0x9a, 0xee, 0x5c, 0xb9, 0x77, 0xc2) > > typedef struct { > @@ -996,6 +997,7 @@ extern struct efi { > unsigned long mem_attr_table; /* memory attributes table */ > unsigned long rng_seed; /* UEFI firmware random seed */ > unsigned long tpm_log; /* TPM2 Event Log table */ > + unsigned long tpm_final_log; /* TPM2 Final Events Log table */ > unsigned long mem_reserve; /* Linux EFI memreserve table */ > efi_get_time_t *get_time; > efi_set_time_t *set_time; > @@ -1707,6 +1709,13 @@ struct linux_efi_tpm_eventlog { > > extern int efi_tpm_eventlog_init(void); > > +struct efi_tcg2_final_events_table { > + u64 version; > + u64 nr_events; > + u8 events[]; > +}; > +extern int efi_tpm_final_log_size; > + > /* > * efi_runtime_service() function identifiers. > * "NONE" is used by efi_recover_from_page_fault() to check if the page > diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h > index 6a86144e13f1..63238c84dc0b 100644 > --- a/include/linux/tpm_eventlog.h > +++ b/include/linux/tpm_eventlog.h > @@ -112,10 +112,35 @@ struct tcg_pcr_event2_head { > struct tpm_digest digests[]; > } __packed; > > +struct tcg_algorithm_size { > + u16 algorithm_id; > + u16 algorithm_size; > +}; > + > +struct tcg_algorithm_info { > + u8 signature[16]; > + u32 platform_class; > + u8 spec_version_minor; > + u8 spec_version_major; > + u8 spec_errata; > + u8 uintn_size; > + u32 number_of_algorithms; > + struct tcg_algorithm_size digest_sizes[]; > +}; > + > +#ifndef TPM_MEMREMAP > +#define TPM_MEMREMAP(start, size) NULL > +#endif > + > +#ifndef TPM_MEMUNMAP > +#define TPM_MEMUNMAP(start, size) do{} while(0) > +#endif > + > /** > * __calc_tpm2_event_size - calculate the size of a TPM2 event log entry > * @event: Pointer to the event whose size should be calculated > * @event_header: Pointer to the initial event containing the digest len= gths > + * @do_mapping: Whether or not the event needs to be mapped > * > * The TPM2 event log format can contain multiple digests corresponding = to > * separate PCR banks, and also contains a variable length of the data t= hat > @@ -131,10 +156,13 @@ struct tcg_pcr_event2_head { > */ > > static inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *eve= nt, > - struct tcg_pcr_event *event_head= er) > + struct tcg_pcr_event *event_head= er, > + bool do_mapping) > { > struct tcg_efi_specid_event_head *efispecid; > struct tcg_event_field *event_field; > + void *mapping =3D NULL; > + int mapping_size; > void *marker; > void *marker_start; > u32 halg_size; > @@ -148,16 +176,49 @@ static inline int __calc_tpm2_event_size(struct tcg= _pcr_event2_head *event, > marker =3D marker + sizeof(event->pcr_idx) + sizeof(event->event_= type) > + sizeof(event->count); > > + /* Map the event header */ > + if (do_mapping) { > + mapping_size =3D marker - marker_start; > + mapping =3D TPM_MEMREMAP((unsigned long)marker_start, > + mapping_size); > + if (!mapping) { > + size =3D 0; > + goto out; > + } > + } else { > + mapping =3D marker_start; > + } > + > + event =3D (struct tcg_pcr_event2_head *)mapping; > + > efispecid =3D (struct tcg_efi_specid_event_head *)event_header->e= vent; > > /* Check if event is malformed. */ > - if (event->count > efispecid->num_algs) > - return 0; > + if (event->count > efispecid->num_algs) { > + size =3D 0; > + goto out; > + } > > for (i =3D 0; i < event->count; i++) { > halg_size =3D sizeof(event->digests[i].alg_id); > - memcpy(&halg, marker, halg_size); > + > + /* Map the digest's algorithm identifier */ > + if (do_mapping) { > + TPM_MEMUNMAP(mapping, mapping_size); > + mapping_size =3D halg_size; > + mapping =3D TPM_MEMREMAP((unsigned long)marker, > + mapping_size); > + if (!mapping) { > + size =3D 0; > + goto out; > + } > + } else { > + mapping =3D marker; > + } > + > + memcpy(&halg, mapping, halg_size); > marker =3D marker + halg_size; > + > for (j =3D 0; j < efispecid->num_algs; j++) { > if (halg =3D=3D efispecid->digest_sizes[j].alg_id= ) { > marker +=3D > @@ -166,18 +227,41 @@ static inline int __calc_tpm2_event_size(struct tcg= _pcr_event2_head *event, > } > } > /* Algorithm without known length. Such event is unparsea= ble. */ > - if (j =3D=3D efispecid->num_algs) > - return 0; > + if (j =3D=3D efispecid->num_algs) { > + size =3D 0; > + goto out; > + } > + } > + > + /* > + * Map the event size - we don't read from the event itself, so > + * we don't need to map it > + */ > + if (do_mapping) { > + TPM_MEMUNMAP(mapping, mapping_size); > + mapping_size +=3D sizeof(event_field->event_size); > + mapping =3D TPM_MEMREMAP((unsigned long)marker, > + mapping_size); > + if (!mapping) { > + size =3D 0; > + goto out; > + } > + } else { > + mapping =3D marker; > } > > - event_field =3D (struct tcg_event_field *)marker; > + event_field =3D (struct tcg_event_field *)mapping; > + > marker =3D marker + sizeof(event_field->event_size) > + event_field->event_size; > size =3D marker - marker_start; > > if ((event->event_type =3D=3D 0) && (event_field->event_size =3D= =3D 0)) > - return 0; > - > + size =3D 0; > +out: > + if (do_mapping) > + TPM_MEMUNMAP(mapping, mapping_size); > return size; > } > + > #endif > -- > 2.21.0.1020.gf2820cf01a-goog > --0000000000002fd14f058a2abeee Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIS7QYJKoZIhvcNAQcCoIIS3jCCEtoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ghBTMIIEXDCCA0SgAwIBAgIOSBtqDm4P/739RPqw/wcwDQYJKoZIhvcNAQELBQAwZDELMAkGA1UE BhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExOjA4BgNVBAMTMUdsb2JhbFNpZ24gUGVy c29uYWxTaWduIFBhcnRuZXJzIENBIC0gU0hBMjU2IC0gRzIwHhcNMTYwNjE1MDAwMDAwWhcNMjEw NjE1MDAwMDAwWjBMMQswCQYDVQQGEwJCRTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEiMCAG A1UEAxMZR2xvYmFsU2lnbiBIViBTL01JTUUgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBALR23lKtjlZW/17kthzYcMHHKFgywfc4vLIjfq42NmMWbXkNUabIgS8KX4PnIFsTlD6F GO2fqnsTygvYPFBSMX4OCFtJXoikP2CQlEvO7WooyE94tqmqD+w0YtyP2IB5j4KvOIeNv1Gbnnes BIUWLFxs1ERvYDhmk+OrvW7Vd8ZfpRJj71Rb+QQsUpkyTySaqALXnyztTDp1L5d1bABJN/bJbEU3 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