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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j3ObU-00008s-Pd; Sun, 16 Feb 2020 18:25:16 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j3Oa9-0006JP-Ia for linux-arm-kernel@lists.infradead.org; Sun, 16 Feb 2020 18:23:55 +0000 Received: from e123331-lin.home (amontpellier-657-1-18-247.w109-210.abo.wanadoo.fr [109.210.65.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E423222522; Sun, 16 Feb 2020 18:23:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581877433; bh=5b5M140echkw/dYLSqSctOwCKM+tl990EFoGSiaFw2k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HL5m5V5v7X31CbKPqK9uKYszH3bGqayPB7bHXAdrLRBZiOq8DGY4Jhv29cBpdNayF InnfJT+snnuYCP5ROfE/aj+0yO4XsIpvG2m/ZQY83laqD2ZGEmSln35erh20PYer8L UlsdVjOHsQp1U8XUgs0oPSgqJfJUbhrWuCuSQmY8= From: Ard Biesheuvel To: linux-efi@vger.kernel.org Subject: [PATCH 04/18] efi: make rng_seed table handling local to efi.c Date: Sun, 16 Feb 2020 19:23:20 +0100 Message-Id: <20200216182334.8121-5-ardb@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200216182334.8121-1-ardb@kernel.org> References: <20200216182334.8121-1-ardb@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200216_102353_684400_9535CA82 X-CRM114-Status: GOOD ( 14.08 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nivedita@alum.mit.edu, x86@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ard Biesheuvel MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Move the rng_seed table address from struct efi into a static global variable in efi.c, which is the only place we ever refer to it anyway. This reduces the footprint of struct efi, which is a r/w data structure that is shared with the world. Signed-off-by: Ard Biesheuvel --- drivers/firmware/efi/efi.c | 21 ++++++++++---------- include/linux/efi.h | 1 - 2 files changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 68527fbbe01c..bbb6246d08be 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -44,13 +44,14 @@ struct efi __read_mostly efi = { .config_table = EFI_INVALID_TABLE_ADDR, .esrt = EFI_INVALID_TABLE_ADDR, .mem_attr_table = EFI_INVALID_TABLE_ADDR, - .rng_seed = EFI_INVALID_TABLE_ADDR, .tpm_log = EFI_INVALID_TABLE_ADDR, .tpm_final_log = EFI_INVALID_TABLE_ADDR, .mem_reserve = EFI_INVALID_TABLE_ADDR, }; EXPORT_SYMBOL(efi); +static unsigned long __ro_after_init rng_seed = EFI_INVALID_TABLE_ADDR; + struct mm_struct efi_mm = { .mm_rb = RB_ROOT, .mm_users = ATOMIC_INIT(2), @@ -467,7 +468,7 @@ static __initdata efi_config_table_type_t common_tables[] = { {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3}, {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt}, {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table}, - {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed}, + {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &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}, @@ -535,11 +536,11 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, pr_cont("\n"); set_bit(EFI_CONFIG_TABLES, &efi.flags); - if (efi.rng_seed != EFI_INVALID_TABLE_ADDR) { + if (rng_seed != EFI_INVALID_TABLE_ADDR) { struct linux_efi_random_seed *seed; u32 size = 0; - seed = early_memremap(efi.rng_seed, sizeof(*seed)); + seed = early_memremap(rng_seed, sizeof(*seed)); if (seed != NULL) { size = seed->size; early_memunmap(seed, sizeof(*seed)); @@ -547,8 +548,7 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, pr_err("Could not map UEFI random seed!\n"); } if (size > 0) { - seed = early_memremap(efi.rng_seed, - sizeof(*seed) + size); + seed = early_memremap(rng_seed, sizeof(*seed) + size); if (seed != NULL) { pr_notice("seeding entropy pool\n"); add_bootloader_randomness(seed->bits, seed->size); @@ -1048,7 +1048,7 @@ static int update_efi_random_seed(struct notifier_block *nb, if (!kexec_in_progress) return NOTIFY_DONE; - seed = memremap(efi.rng_seed, sizeof(*seed), MEMREMAP_WB); + seed = memremap(rng_seed, sizeof(*seed), MEMREMAP_WB); if (seed != NULL) { size = min(seed->size, EFI_RANDOM_SEED_SIZE); memunmap(seed); @@ -1056,8 +1056,7 @@ static int update_efi_random_seed(struct notifier_block *nb, pr_err("Could not map UEFI random seed!\n"); } if (size > 0) { - seed = memremap(efi.rng_seed, sizeof(*seed) + size, - MEMREMAP_WB); + seed = memremap(rng_seed, sizeof(*seed) + size, MEMREMAP_WB); if (seed != NULL) { seed->size = size; get_random_bytes(seed->bits, seed->size); @@ -1073,9 +1072,9 @@ static struct notifier_block efi_random_seed_nb = { .notifier_call = update_efi_random_seed, }; -static int register_update_efi_random_seed(void) +static int __init register_update_efi_random_seed(void) { - if (efi.rng_seed == EFI_INVALID_TABLE_ADDR) + if (rng_seed == EFI_INVALID_TABLE_ADDR) return 0; return register_reboot_notifier(&efi_random_seed_nb); } diff --git a/include/linux/efi.h b/include/linux/efi.h index e091f2aff61d..36380542e054 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -540,7 +540,6 @@ extern struct efi { unsigned long config_table; /* config tables */ unsigned long esrt; /* ESRT table */ 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 */