linux-kernel - [RFC PATCH 14/28] x86/rethook: Use RIP-relative reference for return address

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Message-ID: <20240925150059.3955569-44-ardb+git@google.com>
Date: Wed, 25 Sep 2024 17:01:14 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Uros Bizjak <ubizjak@...il.com>, 
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Subject: [RFC PATCH 14/28] x86/rethook: Use RIP-relative reference for return address

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

Instead of pushing an immediate absolute address, which is incompatible
with PIE codegen or linking, use a LEA instruction to take the address
into a register.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/kernel/rethook.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/rethook.c b/arch/x86/kernel/rethook.c
index 8a1c0111ae79..3b3c17ba3cd5 100644
--- a/arch/x86/kernel/rethook.c
+++ b/arch/x86/kernel/rethook.c
@@ -27,7 +27,8 @@ asm(
 #ifdef CONFIG_X86_64
 	ANNOTATE_NOENDBR	/* This is only jumped from ret instruction */
 	/* Push a fake return address to tell the unwinder it's a rethook. */
-	"	pushq $arch_rethook_trampoline\n"
+	"	leaq arch_rethook_trampoline(%rip), %rdi\n"
+	"	pushq %rdi\n"
 	UNWIND_HINT_FUNC
 	"       pushq $" __stringify(__KERNEL_DS) "\n"
 	/* Save the 'sp - 16', this will be fixed later. */
-- 
2.46.0.792.g87dc391469-goog