linux-kernel - [tip: core/rseq] select: Convert to scoped user access

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Message-ID: <176218127910.2601451.7631394423002916236.tip-bot2@tip-bot2>
Date: Mon, 03 Nov 2025 14:47:59 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: core/rseq] select: Convert to scoped user access

The following commit has been merged into the core/rseq branch of tip:

Commit-ID:     6ec821f050e2e539cf3e57ff294d451c84a83aaf
Gitweb:        https://git.kernel.org/tip/6ec821f050e2e539cf3e57ff294d451c84a83aaf
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 27 Oct 2025 09:44:04 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 03 Nov 2025 15:26:12 +01:00

select: Convert to scoped user access

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

No functional change intended.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Link: https://patch.msgid.link/20251027083745.862419776@linutronix.de
---
 fs/select.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/select.c b/fs/select.c
index 082cf60..65019b8 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -776,17 +776,13 @@ static inline int get_sigset_argpack(struct sigset_argpack *to,
 {
 	// 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_user_read_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;
 }