linux-kernel - [PATCH 25/41] x86/alternatives: Assert input parameters in text_poke_int3

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Message-ID: <20250327205355.378659-26-mingo@kernel.org>
Date: Thu, 27 Mar 2025 21:53:38 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 25/41] x86/alternatives: Assert input parameters in text_poke_int3_batch()

At this point the 'tp' input parameter must always be the
global 'tp_vec' array, and 'nr_entries' must always be equal
to 'tp_vec_nr'.

Assert these conditions - which will allow the removal of
a layer of indirection between these values.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/alternative.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 4f23f6b4d51d..393d796e797d 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -2627,6 +2627,9 @@ static void text_poke_int3_batch(struct text_poke_int3_loc *tp, unsigned int nr_
 
 	lockdep_assert_held(&text_mutex);
 
+	WARN_ON_ONCE(tp != tp_vec);
+	WARN_ON_ONCE(nr_entries != tp_vec_nr);
+
 	int3_vec.vec = tp;
 	int3_vec.nr_entries = nr_entries;
 
-- 
2.45.2