From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6881C2BA83 for ; Sun, 16 Feb 2020 18:25:24 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9D37C22522 for ; Sun, 16 Feb 2020 18:25:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="dln1W/TX"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="HL5m5V5v" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9D37C22522 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=NlNOxw0idV10+0ZK92VpuYc3dKuJGMeFWfT2YIDa4XU=; b=dln1W/TXcMqh7l+oRvKhjFCZNV qvzL0QtRzKjWDm0D1gLl7m3bGa99LG4PZZJ9/pTyXyLgEG58G+XvQcKITGDpZmzMNTOhJFeiv2lWw iNTsYql5QLztR0VRgqor6MEJRtx3/BXgDCezmiCbbwiGB4yelrJfbVFIQ5Nqs7acH7y9/Sn7p730V zjUBwMwCetHWfK6RYgOD70lhm9VZsfKVZLo+sPq+zX8y43IFUQhhz/1GGevEuEDiRp8uToCF+NGvU 0PR9koox6NbPMGQq+HIfrG6fBbnMKPlknVJay/G8lf3zmtkk/EjlGSUvQ1TasQZGNLPeVVPpYDvb5 k0xP+ojw==; 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 1j3ObV-00008s-1F; Sun, 16 Feb 2020 18:25:17 +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-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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.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 */ -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel