linux-kernel - [tip: x86/urgent] x86/microcode: Fix Entrysign revision check for Zen1/Naples

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Message-ID: <176104223500.2601451.11098381703248009004.tip-bot2@tip-bot2>
Date: Tue, 21 Oct 2025 10:23:54 -0000
From: "tip-bot2 for Andrew Cooper" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Andrew Cooper <andrew.cooper3@...rix.com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>,  <stable@...nel.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/urgent] x86/microcode: Fix Entrysign revision check for Zen1/Naples

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     876f0d43af78639790bee0e57b39d498ae35adcf
Gitweb:        https://git.kernel.org/tip/876f0d43af78639790bee0e57b39d498ae35adcf
Author:        Andrew Cooper <andrew.cooper3@...rix.com>
AuthorDate:    Mon, 20 Oct 2025 15:41:24 +01:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Tue, 21 Oct 2025 12:16:51 +02:00

x86/microcode: Fix Entrysign revision check for Zen1/Naples

... to match AMD's statement here:

https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7033.html

Fixes: 50cef76d5cb0 ("x86/microcode/AMD: Load only SHA256-checksummed patches")
Signed-off-by: Andrew Cooper <andrew.cooper3@...rix.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Cc: <stable@...nel.org>
Link: https://patch.msgid.link/20251020144124.2930784-1-andrew.cooper3@citrix.com
---
 arch/x86/kernel/cpu/microcode/amd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index cdce885..28ed8c0 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -194,7 +194,7 @@ static bool need_sha_check(u32 cur_rev)
 	}
 
 	switch (cur_rev >> 8) {
-	case 0x80012: return cur_rev <= 0x800126f; break;
+	case 0x80012: return cur_rev <= 0x8001277; break;
 	case 0x80082: return cur_rev <= 0x800820f; break;
 	case 0x83010: return cur_rev <= 0x830107c; break;
 	case 0x86001: return cur_rev <= 0x860010e; break;