linux-kernel - [patch 4/4] select: Use user_read_masked

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Message-ID: <20250813151939.792908766@linutronix.de>
Date: Wed, 13 Aug 2025 17:57:09 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>,
 Jan Kara <jack@...e.cz>,
 linux-fsdevel@...r.kernel.org,
 Peter Zijlstra <peterz@...radead.org>,
 Darren Hart <dvhart@...radead.org>,
 Davidlohr Bueso <dave@...olabs.net>,
 André Almeida <andrealmeid@...lia.com>,
 x86@...nel.org
Subject: [patch 4/4] select: Use user_read_masked_begin()

Replace the can_do_masked_user_access()	conditional with the generic macro.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jan Kara <jack@...e.cz>
Cc: linux-fsdevel@...r.kernel.org
---
 fs/select.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/fs/select.c
+++ b/fs/select.c
@@ -776,9 +776,7 @@ static inline int get_sigset_argpack(str
 {
 	// the path is hot enough for overhead of copy_from_user() to matter
 	if (from) {
-		if (can_do_masked_user_access())
-			from = masked_user_access_begin(from);
-		else if (!user_read_access_begin(from, sizeof(*from)))
+		if (!user_read_masked_begin(from))
 			return -EFAULT;
 		unsafe_get_user(to->p, &from->p, Efault);
 		unsafe_get_user(to->size, &from->size, Efault);