linux-kernel - [PATCH] x86: Don't discard .exit.text and .exit.data at link-time

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Date:   Thu, 30 Jan 2020 10:00:48 -0800
From:   "H.J. Lu" <hjl.tools@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [PATCH] x86: Don't discard .exit.text and .exit.data at link-time

Since .exit.text and .exit.data sections are discarded at runtime, we
should undefine EXIT_TEXT and EXIT_DATA to exclude .exit.text and
.exit.data sections from default discarded sections.

Signed-off-by: H.J. Lu <hjl.tools@...il.com>
---
 arch/x86/kernel/vmlinux.lds.S | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index d1b942365d27..fb2c45cb1d1f 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -416,6 +416,12 @@ SECTIONS
 	STABS_DEBUG
 	DWARF_DEBUG
 
+	/* Sections to be discarded.  EXIT_TEXT and EXIT_DATA discard at runtime.
+	 * not link time.  */
+#undef EXIT_TEXT
+#define EXIT_TEXT
+#undef EXIT_DATA
+#define EXIT_DATA
 	DISCARDS
 	/DISCARD/ : {
 		*(.eh_frame)
-- 
2.24.1