linux-kernel - [PATCH] x86/microcode/AMD: Increase microcode PATCH_MAX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230720202813.3269888-1-john.allen@amd.com>
Date:   Thu, 20 Jul 2023 20:28:13 +0000
From:   John Allen <john.allen@....com>
To:     <bp@...en8.de>, <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <x86@...nel.org>, John Allen <john.allen@....com>,
        <stable@...r.kernel.org>
Subject: [PATCH] x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE

Future AMD cpus will have microcode patches that exceed the current
limit of three 4K pages. Increase substantially to avoid future size
increases.

Signed-off-by: John Allen <john.allen@....com>
Cc: stable@...r.kernel.org
---
 arch/x86/include/asm/microcode_amd.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index e6662adf3af4..e3d5f5ae2f46 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -41,7 +41,7 @@ struct microcode_amd {
 	unsigned int			mpb[];
 };
 
-#define PATCH_MAX_SIZE (3 * PAGE_SIZE)
+#define PATCH_MAX_SIZE (8 * PAGE_SIZE)
 
 #ifdef CONFIG_MICROCODE_AMD
 extern void __init load_ucode_amd_bsp(unsigned int family);
-- 
2.39.3