linux-kernel - [patch V3 12/12] select: Convert to scoped masked user access

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Message-ID: <20251017093030.570048808@linutronix.de>
Date: Fri, 17 Oct 2025 12:09:18 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>,
 Jan Kara <jack@...e.cz>,
 linux-fsdevel@...r.kernel.org,
 kernel test robot <lkp@...el.com>,
 Russell King <linux@...linux.org.uk>,
 linux-arm-kernel@...ts.infradead.org,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 x86@...nel.org,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>,
 Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 linuxppc-dev@...ts.ozlabs.org,
 Paul Walmsley <pjw@...nel.org>,
 Palmer Dabbelt <palmer@...belt.com>,
 linux-riscv@...ts.infradead.org,
 Heiko Carstens <hca@...ux.ibm.com>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Sven Schnelle <svens@...ux.ibm.com>,
 linux-s390@...r.kernel.org,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Cooper <andrew.cooper3@...rix.com>,
 Julia Lawall <Julia.Lawall@...ia.fr>,
 Nicolas Palix <nicolas.palix@...g.fr>,
 Peter Zijlstra <peterz@...radead.org>,
 Darren Hart <dvhart@...radead.org>,
 Davidlohr Bueso <dave@...olabs.net>,
 André Almeida <andrealmeid@...lia.com>
Subject: [patch V3 12/12] select: Convert to scoped masked user access

From: Thomas Gleixner <tglx@...utronix.de>

Replace the open coded implementation with the scoped masked user access
guard.

No functional change intended.

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
---
V3: Adopt to scope changes
---
 fs/select.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)
---
--- a/fs/select.c
+++ b/fs/select.c
@@ -776,17 +776,13 @@ 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)))
-			return -EFAULT;
-		unsafe_get_user(to->p, &from->p, Efault);
-		unsafe_get_user(to->size, &from->size, Efault);
-		user_read_access_end();
+		scoped_masked_user_rw_access(from, Efault) {
+			unsafe_get_user(to->p, &from->p, Efault);
+			unsafe_get_user(to->size, &from->size, Efault);
+		}
 	}
 	return 0;
 Efault:
-	user_read_access_end();
 	return -EFAULT;
 }