From 28621ec2d46c6adf7d33a6facbd83e2fa566bd34 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 15 Dec 2025 17:52:12 +0100
Subject: [PATCH] rseq: Add prctl() to enable time slice extensions

Implement a prctl() so that tasks can enable the time slice extension
mechanism. This fails, when time slice extensions are disabled at compile
time or on the kernel command line and when no rseq pointer is registered
in the kernel.

That allows to implement a single trivial check in the exit to user mode
hotpath, to decide whether the whole mechanism needs to be invoked.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251215155708.858717691@linutronix.de
---
 include/linux/rseq.h       |  9 +++++++
 include/uapi/linux/prctl.h | 10 ++++++++
 kernel/rseq.c              | 52 ++++++++++++++++++++++++++++++++++++++
 kernel/sys.c               |  6 +++++
 4 files changed, 77 insertions(+)

diff --git a/include/linux/rseq.h b/include/linux/rseq.h
index 2266f4dc77b6c..3c194a02ad0a8 100644
--- a/include/linux/rseq.h
+++ b/include/linux/rseq.h
@@ -163,4 +163,13 @@ void rseq_syscall(struct pt_regs *regs);
 static inline void rseq_syscall(struct pt_regs *regs) { }
 #endif /* !CONFIG_DEBUG_RSEQ */
 
+#ifdef CONFIG_RSEQ_SLICE_EXTENSION
+int rseq_slice_extension_prctl(unsigned long arg2, unsigned long arg3);
+#else /* CONFIG_RSEQ_SLICE_EXTENSION */
+static inline int rseq_slice_extension_prctl(unsigned long arg2, unsigned long arg3)
+{
+	return -ENOTSUPP;
+}
+#endif /* !CONFIG_RSEQ_SLICE_EXTENSION */
+
 #endif /* _LINUX_RSEQ_H */
diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h
index 51c4e8c82b1e9..79944b7ae50aa 100644
--- a/include/uapi/linux/prctl.h
+++ b/include/uapi/linux/prctl.h
@@ -386,4 +386,14 @@ struct prctl_mm_map {
 # define PR_FUTEX_HASH_SET_SLOTS	1
 # define PR_FUTEX_HASH_GET_SLOTS	2
 
+/* RSEQ time slice extensions */
+#define PR_RSEQ_SLICE_EXTENSION			79
+# define PR_RSEQ_SLICE_EXTENSION_GET		1
+# define PR_RSEQ_SLICE_EXTENSION_SET		2
+/*
+ * Bits for RSEQ_SLICE_EXTENSION_GET/SET
+ * PR_RSEQ_SLICE_EXT_ENABLE:	Enable
+ */
+# define PR_RSEQ_SLICE_EXT_ENABLE		0x01
+
 #endif /* _LINUX_PRCTL_H */
diff --git a/kernel/rseq.c b/kernel/rseq.c
index 415d75b6df2c4..09848bb14ec2b 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -71,6 +71,7 @@
 #define RSEQ_BUILD_SLOW_PATH
 
 #include <linux/debugfs.h>
+#include <linux/prctl.h>
 #include <linux/ratelimit.h>
 #include <linux/rseq_entry.h>
 #include <linux/sched.h>
@@ -501,6 +502,57 @@ efault:
 #ifdef CONFIG_RSEQ_SLICE_EXTENSION
 DEFINE_STATIC_KEY_TRUE(rseq_slice_extension_key);
 
+int rseq_slice_extension_prctl(unsigned long arg2, unsigned long arg3)
+{
+	switch (arg2) {
+	case PR_RSEQ_SLICE_EXTENSION_GET:
+		if (arg3)
+			return -EINVAL;
+		return current->rseq.slice.state.enabled ? PR_RSEQ_SLICE_EXT_ENABLE : 0;
+
+	case PR_RSEQ_SLICE_EXTENSION_SET: {
+		u32 rflags, valid = RSEQ_CS_FLAG_SLICE_EXT_AVAILABLE;
+		bool enable = !!(arg3 & PR_RSEQ_SLICE_EXT_ENABLE);
+
+		if (arg3 & ~PR_RSEQ_SLICE_EXT_ENABLE)
+			return -EINVAL;
+		if (!rseq_slice_extension_enabled())
+			return -ENOTSUPP;
+		if (!current->rseq.usrptr)
+			return -ENXIO;
+
+		/* No change? */
+		if (enable == !!current->rseq.slice.state.enabled)
+			return 0;
+
+		if (get_user(rflags, &current->rseq.usrptr->flags))
+			goto die;
+
+		if (current->rseq.slice.state.enabled)
+			valid |= RSEQ_CS_FLAG_SLICE_EXT_ENABLED;
+
+		if ((rflags & valid) != valid)
+			goto die;
+
+		rflags &= ~RSEQ_CS_FLAG_SLICE_EXT_ENABLED;
+		rflags |= RSEQ_CS_FLAG_SLICE_EXT_AVAILABLE;
+		if (enable)
+			rflags |= RSEQ_CS_FLAG_SLICE_EXT_ENABLED;
+
+		if (put_user(rflags, &current->rseq.usrptr->flags))
+			goto die;
+
+		current->rseq.slice.state.enabled = enable;
+		return 0;
+	}
+	default:
+		return -EINVAL;
+	}
+die:
+	force_sig(SIGSEGV);
+	return -EFAULT;
+}
+
 static int __init rseq_slice_cmdline(char *str)
 {
 	bool on;
diff --git a/kernel/sys.c b/kernel/sys.c
index 8b58eece4e580..af71987df81ce 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -53,6 +53,7 @@
 #include <linux/time_namespace.h>
 #include <linux/binfmts.h>
 #include <linux/futex.h>
+#include <linux/rseq.h>
 
 #include <linux/sched.h>
 #include <linux/sched/autogroup.h>
@@ -2868,6 +2869,11 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 	case PR_FUTEX_HASH:
 		error = futex_hash_prctl(arg2, arg3, arg4);
 		break;
+	case PR_RSEQ_SLICE_EXTENSION:
+		if (arg4 || arg5)
+			return -EINVAL;
+		error = rseq_slice_extension_prctl(arg2, arg3);
+		break;
 	default:
 		trace_task_prctl_unknown(option, arg2, arg3, arg4, arg5);
 		error = -EINVAL;
-- 
2.47.3