linux-hardening - [PATCH] gcc-plugins/stackleak: Avoid .head.text section

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Date: Thu, 28 Mar 2024 07:42:57 +0100
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-hardening@...r.kernel.org
Cc: keescook@...omium.org, x86@...nel.org, linux-kernel@...r.kernel.org, 
	kevinloughlin@...gle.com, thomas.lendacky@....com, 
	Ard Biesheuvel <ardb@...nel.org>, kernel test robot <oliver.sang@...el.com>
Subject: [PATCH] gcc-plugins/stackleak: Avoid .head.text section

From: Ard Biesheuvel <ardb@...nel.org>

The .head.text section carries the startup code that runs with the MMU
off or with a translation of memory that deviates from the ordinary one.
So avoid instrumentation with the stackleak plugin, which already avoids
.init.text and .noinstr.text entirely.

Fixes: 48204aba801f1b51 ("x86/sme: Move early SME kernel encryption handling into .head.text")
Reported-by: kernel test robot <oliver.sang@...el.com>
Closes: https://lore.kernel.org/oe-lkp/202403221630.2692c998-oliver.sang@intel.com
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 scripts/gcc-plugins/stackleak_plugin.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/gcc-plugins/stackleak_plugin.c b/scripts/gcc-plugins/stackleak_plugin.c
index c5c2ce113c92..d20c47d21ad8 100644
--- a/scripts/gcc-plugins/stackleak_plugin.c
+++ b/scripts/gcc-plugins/stackleak_plugin.c
@@ -467,6 +467,8 @@ static bool stackleak_gate(void)
 			return false;
 		if (STRING_EQUAL(section, ".entry.text"))
 			return false;
+		if (STRING_EQUAL(section, ".head.text"))
+			return false;
 	}
 
 	return track_frame_size >= 0;
-- 
2.44.0.396.g6e790dbe36-goog