From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761868AbcLRQoy (ORCPT ); Sun, 18 Dec 2016 11:44:54 -0500 Received: from mail.skyhub.de ([78.46.96.112]:54812 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754247AbcLRQoR (ORCPT ); Sun, 18 Dec 2016 11:44:17 -0500 From: Borislav Petkov To: X86 ML Cc: Boris Ostrovsky , =?UTF-8?q?J=C3=BCrgen=20Gross?= , LKML Subject: [PATCH 2/4] x86/microcode/AMD: Sanitize apply_microcode_early_amd() Date: Sun, 18 Dec 2016 17:44:12 +0100 Message-Id: <20161218164414.9649-3-bp@alien8.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20161218164414.9649-1-bp@alien8.de> References: <20161218164414.9649-1-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Borislav Petkov Make it simply return bool to denote whether it found a container or not and return the pointer to the container and its size in the handed-in container pointer instead, as returning a struct was just silly. Signed-off-by: Borislav Petkov --- arch/x86/kernel/cpu/microcode/amd.c | 30 +++++++++++++++++------------- 1 file changed, 17 insertions(+), 13 deletions(-) diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c index 31f4e3f94d46..dc80acfa922d 100644 --- a/arch/x86/kernel/cpu/microcode/amd.c +++ b/arch/x86/kernel/cpu/microcode/amd.c @@ -216,17 +216,18 @@ static int __apply_microcode_amd(struct microcode_amd *mc_amd) * and on 32-bit during save_microcode_in_initrd_amd() -- we can call * load_microcode_amd() to save equivalent cpu table and microcode patches in * kernel heap memory. + * + * Returns true if container found (sets @ret_cont), false otherwise. */ -static struct container -apply_microcode_early_amd(void *ucode, size_t size, bool save_patch) +static bool apply_microcode_early_amd(void *ucode, size_t size, bool save_patch, + struct container *ret_cont) { - struct container ret = { NULL, 0 }; u8 (*patch)[PATCH_MAX_SIZE]; + u32 rev, *header, *new_rev; + struct container ret; int offset, left; - u32 rev, *header; - u8 *data; u16 eq_id = 0; - u32 *new_rev; + u8 *data; #ifdef CONFIG_X86_32 new_rev = (u32 *)__pa_nodebug(&ucode_new_rev); @@ -237,11 +238,11 @@ apply_microcode_early_amd(void *ucode, size_t size, bool save_patch) #endif if (check_current_patch_level(&rev, true)) - return (struct container){ NULL, 0 }; + return false; eq_id = find_proper_container(ucode, size, &ret); if (!eq_id) - return (struct container){ NULL, 0 }; + return false; this_equiv_id = eq_id; header = (u32 *)ret.data; @@ -275,7 +276,11 @@ apply_microcode_early_amd(void *ucode, size_t size, bool save_patch) data += offset; left -= offset; } - return ret; + + if (ret_cont) + *ret_cont = ret; + + return true; } static bool get_builtin_microcode(struct cpio_data *cp, unsigned int family) @@ -319,7 +324,7 @@ void __init load_ucode_amd_bsp(unsigned int family) /* Get BSP's CPUID.EAX(1), needed in load_microcode_amd() */ uci->cpu_sig.sig = cpuid_eax(1); - apply_microcode_early_amd(cp.data, cp.size, true); + apply_microcode_early_amd(cp.data, cp.size, true, NULL); } #ifdef CONFIG_X86_32 @@ -351,7 +356,7 @@ void load_ucode_amd_ap(unsigned int family) * This would set amd_ucode_patch above so that the following APs can * use it directly instead of going down this path again. */ - apply_microcode_early_amd(cp.data, cp.size, true); + apply_microcode_early_amd(cp.data, cp.size, true, NULL); } #else void load_ucode_amd_ap(unsigned int family) @@ -389,8 +394,7 @@ void load_ucode_amd_ap(unsigned int family) } } - cont = apply_microcode_early_amd(cp.data, cp.size, false); - if (!(cont.data && cont.size)) { + if (!apply_microcode_early_amd(cp.data, cp.size, false, &cont)) { cont.size = -1; return; } -- 2.11.0