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[46.103.15.185]) by smtp.gmail.com with ESMTPSA id 17-20020a170906219100b0078dce9984afsm963850eju.220.2022.10.13.23.34.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Oct 2022 23:34:03 -0700 (PDT) Date: Fri, 14 Oct 2022 09:34:00 +0300 From: Ilias Apalodimas To: Sughosh Ganu Cc: u-boot@lists.denx.de, Heinrich Schuchardt , Takahiro Akashi , Patrick Delaunay , Patrice Chotard , Simon Glass , Bin Meng , Tom Rini , Etienne Carriere , Michal Simek , Jassi Brar Subject: Re: [PATCH v13 09/15] FWU: Add boot time checks as highlighted by the FWU specification Message-ID: References: <20221006090629.436518-1-sughosh.ganu@linaro.org> <20221006090629.436518-10-sughosh.ganu@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221006090629.436518-10-sughosh.ganu@linaro.org> X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.6 at phobos.denx.de X-Virus-Status: Clean On Thu, Oct 06, 2022 at 02:36:23PM +0530, Sughosh Ganu wrote: > The FWU Multi Bank Update specification requires the Update Agent to > carry out certain checks at the time of platform boot. The Update > Agent is the component which is responsible for updating the firmware > components and maintaining and keeping the metadata in sync. > > The spec requires that the Update Agent perform the following checks > at the time of boot > * Sanity check of both the metadata copies maintained by the platform. > * Get the boot index passed to U-Boot by the prior stage bootloader > and use this value for metadata bookkeeping. > * Check if the system is booting in Trial State. If the system boots > in the Trial State for more than a specified number of boot counts, > change the Active Bank to be booting the platform from. > > Call these checks through the main loop event at the time of platform > boot. > > Signed-off-by: Sughosh Ganu > Reviewed-by: Etienne Carriere > --- > Changes since V12: None > > include/fwu.h | 13 +++ > lib/fwu_updates/fwu.c | 191 +++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 203 insertions(+), 1 deletion(-) > > diff --git a/include/fwu.h b/include/fwu.h > index 71a03cf70b..2effa7da38 100644 > --- a/include/fwu.h > +++ b/include/fwu.h > @@ -253,4 +253,17 @@ int fwu_plat_get_update_index(uint *update_idx); > * > */ > void fwu_plat_get_bootidx(uint *boot_idx); > + > +/** > + * fwu_update_checks_pass() - Check if FWU update can be done > + * > + * Check if the FWU update can be executed. The updates are > + * allowed only when the platform is not in Trial State and > + * the boot time checks have passed > + * > + * Return: 1 if OK, 0 on error > + * > + */ > +u8 fwu_update_checks_pass(void); > + > #endif /* _FWU_H_ */ > diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c > index 70482d14a0..b14c0dfadd 100644 > --- a/lib/fwu_updates/fwu.c > +++ b/lib/fwu_updates/fwu.c > @@ -4,10 +4,19 @@ > */ > > #include > +#include > #include > +#include > +#include > #include > #include > -#include > +#include > + > +#include > +#include > + > +static u8 trial_state; > +static u8 boottime_check; > > #include > #include > @@ -18,6 +27,112 @@ enum { > IMAGE_ACCEPT_CLEAR, > }; > > +static int trial_counter_update(u16 *trial_state_ctr) > +{ > + bool delete; > + u32 var_attr; > + efi_status_t status; > + efi_uintn_t var_size; > + > + delete = !trial_state_ctr ? true : false; > + var_size = !trial_state_ctr ? 0 : (efi_uintn_t)sizeof(*trial_state_ctr); > + var_attr = !trial_state_ctr ? 0 : EFI_VARIABLE_NON_VOLATILE | > + EFI_VARIABLE_BOOTSERVICE_ACCESS; > + status = efi_set_variable_int(u"TrialStateCtr", > + &efi_global_variable_guid, > + var_attr, > + var_size, trial_state_ctr, false); > + > + if ((delete && (status != EFI_NOT_FOUND && > + status != EFI_SUCCESS)) || > + (!delete && status != EFI_SUCCESS)) > + return -1; > + > + return 0; > +} > + > +static int in_trial_state(struct fwu_mdata *mdata) > +{ > + u32 i, active_bank; > + struct fwu_image_entry *img_entry; > + struct fwu_image_bank_info *img_bank_info; > + > + active_bank = mdata->active_index; > + img_entry = &mdata->img_entry[0]; > + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { > + img_bank_info = &img_entry[i].img_bank_info[active_bank]; > + if (!img_bank_info->accepted) { > + return 1; > + } > + } > + > + return 0; > +} > + > +static int fwu_trial_state_check(struct udevice *dev) > +{ > + int ret; > + efi_status_t status; > + efi_uintn_t var_size; > + u16 trial_state_ctr; > + u32 var_attributes; > + struct fwu_mdata mdata = { 0 }; > + > + ret = fwu_get_mdata(dev, &mdata); > + if (ret) > + return ret; > + > + trial_state = in_trial_state(&mdata); > + if (trial_state) { > + var_size = (efi_uintn_t)sizeof(trial_state_ctr); > + log_info("System booting in Trial State\n"); > + var_attributes = EFI_VARIABLE_NON_VOLATILE | > + EFI_VARIABLE_BOOTSERVICE_ACCESS; Why are we setting those before a get_variable? > + status = efi_get_variable_int(u"TrialStateCtr", > + &efi_global_variable_guid, > + &var_attributes, > + &var_size, &trial_state_ctr, > + NULL); > + if (status != EFI_SUCCESS) { > + log_err("Unable to read TrialStateCtr variable\n"); > + ret = -1; > + goto out; > + } > + > + ++trial_state_ctr; > + if (trial_state_ctr > CONFIG_FWU_TRIAL_STATE_CNT) { > + log_info("Trial State count exceeded. Revert back to previous_active_index\n"); > + ret = fwu_revert_boot_index(); > + if (ret) { > + log_err("Unable to revert active_index\n"); > + goto out; > + } > + > + /* Delete the TrialStateCtr variable */ > + ret = trial_counter_update(NULL); > + if (ret) { > + log_err("Unable to delete TrialStateCtr variable\n"); > + goto out; > + } > + } else { > + ret = trial_counter_update(&trial_state_ctr); > + if (ret) { > + log_err("Unable to increment TrialStateCtr variable\n"); > + goto out; > + } > + } > + } else { > + /* Delete the variable */ > + ret = trial_counter_update(NULL); > + if (ret) { > + log_err("Unable to delete TrialStateCtr variable\n"); > + } > + } > + > +out: > + return ret; > +} > + > static int fwu_get_dev_mdata(struct udevice **dev, struct fwu_mdata *mdata) > { > int ret; > @@ -28,6 +143,9 @@ static int fwu_get_dev_mdata(struct udevice **dev, struct fwu_mdata *mdata) > return ret; > } > > + if (!mdata) > + return 0; > + > ret = fwu_get_mdata(*dev, mdata); > if (ret < 0) > log_debug("Unable to get valid FWU metadata\n"); > @@ -389,3 +507,74 @@ __weak int fwu_plat_get_update_index(uint *update_idx) > > return ret; > } > + > +/** > + * fwu_update_checks_pass() - Check if FWU update can be done > + * > + * Check if the FWU update can be executed. The updates are > + * allowed only when the platform is not in Trial State and > + * the boot time checks have passed > + * > + * Return: 1 if OK, 0 on error > + * > + */ > +u8 fwu_update_checks_pass(void) > +{ > + return !trial_state && boottime_check; > +} > + > +static int fwu_boottime_checks(void *ctx, struct event *event) > +{ > + int ret; > + struct udevice *dev; > + u32 boot_idx, active_idx; > + > + ret = fwu_get_dev_mdata(&dev, NULL); > + if (ret) > + return ret; > + > + ret = fwu_mdata_check(dev); > + if (ret) > + return 0; > + > + /* > + * Get the Boot Index, i.e. the bank from > + * which the platform has booted. This value > + * gets passed from the ealier stage bootloader > + * which booted u-boot, e.g. tf-a. If the > + * boot index is not the same as the > + * active_index read from the FWU metadata, > + * update the active_index. > + */ > + fwu_plat_get_bootidx(&boot_idx); > + if (boot_idx >= CONFIG_FWU_NUM_BANKS) { > + log_err("Received incorrect value of boot_index\n"); > + return 0; > + } > + > + ret = fwu_get_active_index(&active_idx); > + if (ret) { > + log_err("Unable to read active_index\n"); > + return 0; > + } > + > + if (boot_idx != active_idx) { > + log_info("Boot idx %u is not matching active idx %u, changing active_idx\n", > + boot_idx, active_idx); > + ret = fwu_set_active_index(boot_idx); > + if (!ret) > + boottime_check = 1; > + > + return 0; Why are we returning 0 here? If fwu_set_active_index() failed, shouldn't we report that to upper layers? > + } > + > + if (efi_init_obj_list() != EFI_SUCCESS) > + return 0; > + > + ret = fwu_trial_state_check(dev); > + if (!ret) > + boottime_check = 1; ditto > + > + return 0; > +} > +EVENT_SPY(EVT_MAIN_LOOP, fwu_boottime_checks); > -- > 2.34.1 >