Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757252Ab2BHA1l (ORCPT ); Tue, 7 Feb 2012 19:27:41 -0500 Received: from mail-iy0-f174.google.com ([209.85.210.174]:65166 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757191Ab2BHA1R (ORCPT ); Tue, 7 Feb 2012 19:27:17 -0500 From: Olof Johansson To: x86@kernel.org, hpa@zytor.com, mingo@elte.hu, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, matt.fleming@intel.com, mjg@redhat.com, Olof Johansson Subject: [PATCH 4/5] x86: efi: add basic error handling Date: Tue, 7 Feb 2012 16:25:31 -0800 Message-Id: <1328660732-27263-5-git-send-email-olof@lixom.net> X-Mailer: git-send-email 1.7.9.111.gf3fb0 In-Reply-To: <1328660732-27263-1-git-send-email-olof@lixom.net> References: <1328660732-27263-1-git-send-email-olof@lixom.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5648 Lines: 191 It's not perfect, but way better than before. Mark efi_enabled as false in case of error and at least stop dereferencing pointers that are known to be invalid. The only significant missing piece is the lack of undoing the memblock_reserve of the memory that efi marks as in use. On the other hand, it's not a large amount of memory, and leaving it unavailable for system use should be the safer choice anyway. Signed-off-by: Olof Johansson Acked-by: Matt Fleming --- arch/x86/platform/efi/efi.c | 85 +++++++++++++++++++++++++++++-------------- 1 files changed, 57 insertions(+), 28 deletions(-) diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index 05e543d..c1111f7 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -437,12 +437,14 @@ static void __init efi_free_boot_services(void) } } -static void __init efi_systab_init(void *phys) +static int __init efi_systab_init(void *phys) { efi.systab = early_ioremap((unsigned long)efi_phys.systab, sizeof(efi_system_table_t)); - if (efi.systab == NULL) + if (efi.systab == NULL) { pr_err("Couldn't map the system table!\n"); + return -ENOMEM; + } memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t)); early_iounmap(efi.systab, sizeof(efi_system_table_t)); efi.systab = &efi_systab; @@ -450,16 +452,20 @@ static void __init efi_systab_init(void *phys) /* * Verify the EFI Table */ - if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { pr_err("System table signature incorrect!\n"); + return -EINVAL; + } if ((efi.systab->hdr.revision >> 16) == 0) pr_err("Warning: System table version " "%d.%02d, expected 1.00 or greater!\n", efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff); + + return 0; } -static void __init efi_config_init(u64 tables, int nr_tables) +static int __init efi_config_init(u64 tables, int nr_tables) { efi_config_table_t *config_tables; int i, sz = sizeof(efi_config_table_t); @@ -469,8 +475,10 @@ static void __init efi_config_init(u64 tables, int nr_tables) */ config_tables = early_ioremap(efi.systab->tables, efi.systab->nr_tables * sz); - if (config_tables == NULL) + if (config_tables == NULL) { pr_err("Could not map Configuration table!\n"); + return -ENOMEM; + } pr_info(""); for (i = 0; i < efi.systab->nr_tables; i++) { @@ -504,9 +512,11 @@ static void __init efi_config_init(u64 tables, int nr_tables) } pr_cont("\n"); early_iounmap(config_tables, efi.systab->nr_tables * sz); + + return 0; } -static void __init efi_runtime_init(void) +static int __init efi_runtime_init(void) { efi_runtime_services_t *runtime; @@ -518,37 +528,44 @@ static void __init efi_runtime_init(void) */ runtime = early_ioremap((unsigned long)efi.systab->runtime, sizeof(efi_runtime_services_t)); - if (runtime != NULL) { - /* - * We will only need *early* access to the following - * two EFI runtime services before set_virtual_address_map - * is invoked. - */ - efi_phys.get_time = (efi_get_time_t *)runtime->get_time; - efi_phys.set_virtual_address_map = - (efi_set_virtual_address_map_t *) - runtime->set_virtual_address_map; - /* - * Make efi_get_time can be called before entering - * virtual mode. - */ - efi.get_time = phys_efi_get_time; - } else + if (!runtime) { pr_err("Could not map the runtime service table!\n"); + return -ENOMEM; + } + /* + * We will only need *early* access to the following + * two EFI runtime services before set_virtual_address_map + * is invoked. + */ + efi_phys.get_time = (efi_get_time_t *)runtime->get_time; + efi_phys.set_virtual_address_map = + (efi_set_virtual_address_map_t *) + runtime->set_virtual_address_map; + /* + * Make efi_get_time can be called before entering + * virtual mode. + */ + efi.get_time = phys_efi_get_time; early_iounmap(runtime, sizeof(efi_runtime_services_t)); + + return 0; } -static void __init efi_memmap_init(void) +static int __init efi_memmap_init(void) { /* Map the EFI memory map */ memmap.map = early_ioremap((unsigned long)memmap.phys_map, memmap.nr_map * memmap.desc_size); - if (memmap.map == NULL) + if (memmap.map == NULL) { pr_err("Could not map the memory map!\n"); + return -ENOMEM; + } memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); if (add_efi_memmap) do_add_efi_memmap(); + + return 0; } void __init efi_init(void) @@ -566,7 +583,10 @@ void __init efi_init(void) ((__u64)boot_params.efi_info.efi_systab_hi<<32)); #endif - efi_systab_init(efi_phys.systab); + if (efi_systab_init(efi_phys.systab)) { + efi_enabled = 0; + return; + } /* * Show what we know for posterity @@ -584,11 +604,20 @@ void __init efi_init(void) efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor); - efi_config_init(efi.systab->tables, efi.systab->nr_tables); + if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) { + efi_enabled = 0; + return; + } - efi_runtime_init(); + if (efi_runtime_init()) { + efi_enabled = 0; + return; + } - efi_memmap_init(); + if (efi_memmap_init()) { + efi_enabled = 0; + return; + } #ifdef CONFIG_X86_32 x86_platform.get_wallclock = efi_get_time; -- 1.7.9.111.gf3fb0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/