Subject: [PATCHv2] arm64/entry: Fix arm64-specific rseq brokenness

From: Mark Rutland <[email-masked]>
Date: Fri, 8 May 2026 15:20:23 +0100

Hi,

In all the confusion with the rseq fixes, it looks like the arm64 patch
didn't get picked up into the tip tree. That was queued up in Thomas's
devel/core/rseq branch, but it didn't get reposted and picked up into
tip.

Thomas, Peter, are you happy to pick the below into the tip sched/urgent
branch? It's the same as what what in Thomas's devel/core/rseq branch:

  https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?h=core/rseq&id=04db289d5633dad546a0778537f0f0e52ebfc88b

... which was taken from my arm64/rseq branch:

  https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?h=arm64/rseq&id=05bce437d4f2fd14a7be4706c684a618e2fcc82f

It applies cleanly and passes all tests.

Catalin, Will, you both mentioned off-list that you were happy for this
to go via tip with the rest of the rseq fixes. Can either of you please
confirm with an ack?

Mark.

---->8----
Mathias Stearn reports that since v6.19, there are two big issues
affecting rseq:

(1) On arm64 specifically, rseq critical sections aren't aborted when
    they should be.

(2) The 'cpu_id_start' field is no longer written by the kernel in all
    cases it used to be, including some cases where TCMalloc depends on
    the kernel clobbering the field.

This patch fixes issue #1. This patch DOES NOT fix issue #2, which will
need to be addressed by other patches.

The arm64-specific brokenness is a result of commits:

  2fc0e4b4126c ("rseq: Record interrupt from user space")
  39a167560a61 ("rseq: Optimize event setting")

The first commit failed to add a call to rseq_note_user_irq_entry() on
arm64. Thus arm64 never sets rseq_event::user_irq to record that it may
be necessary to abort an active rseq critical section upon return to
userspace. On its own, this commit had no functional impact as the value
of rseq_event::user_irq was not consumed.

The second commit relied upon rseq_event::user_irq to determine whether
or not to bother to perform rseq work when returning to userspace. As
rseq_event::user_irq wasn't set on arm64, this work would be skipped,
and consequently an active rseq critical section would not be aborted.

Fix this by giving arm64 syscall-specific entry/exit paths, and
performing the relevant logic in syscall and non-syscall paths,
including calling rseq_note_user_irq_entry() for non-syscall entry.

Currently arm64 cannot use syscall_enter_from_user_mode(),
syscall_exit_to_user_mode(), and irqentry_exit_to_user_mode(), due to
ordering constraints with exception masking, and risk of ABI breakage
for syscall tracing/audit/etc. For the moment the entry/exit logic is
left as arm64-specific, directly using enter_from_user_mode() and
exit_to_user_mode(), but mirroring the generic code.

I intend to follow up with refactoring/cleanup, as we did for kernel
mode entry paths in commit:

  041aa7a85390 ("entry: Split preemption from irqentry_exit_to_kernel_mode()")

... which will allow arm64 to use the GENERIC_IRQ_ENTRY functions directly.

Fixes: 39a167560a61 ("rseq: Optimize event setting")
Reported-by: Mathias Stearn <[email-masked]>
Link: https://lore.kernel.org/regressions/CAHnCjA25b+nO2n5CeifknSKHssJpPrjnf+dtr7UgzRw4Zgu=[email-masked]/
Signed-off-by: Mark Rutland <[email-masked]>
Cc: Catalin Marinas <[email-masked]>
Cc: Chris Kennelly <[email-masked]>
Cc: Dmitry Vyukov <[email-masked]>
Cc: Jinjie Ruan <[email-masked]>
Cc: Mathieu Desnoyers <[email-masked]>
Cc: Peter Zijlstra <[email-masked]>
Cc: Thomas Gleixner <[email-masked]>
Cc: Will Deacon <[email-masked]>
---
 arch/arm64/kernel/entry-common.c | 31 ++++++++++++++++++++++++-------
 include/linux/irq-entry-common.h |  8 --------
 include/linux/rseq_entry.h       | 19 -------------------
 3 files changed, 24 insertions(+), 34 deletions(-)

Since v1 [1]:
* Restore sme_{enter_from,exit_to}_user_mode()
* Describe use of enter_from_user_mode() in commit message

[1] https://lore.kernel.org/linux-arm-kernel/aeueE1I1OuVkOcEZ@J2N7QTR9R3/

diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index cb54335465f66..c7a23f7c22122 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -62,6 +62,13 @@ static void noinstr arm64_exit_to_kernel_mode(struct pt_regs *regs,
 	irqentry_exit_to_kernel_mode_after_preempt(regs, state);
 }
 
+static __always_inline void arm64_syscall_enter_from_user_mode(struct pt_regs *regs)
+{
+	enter_from_user_mode(regs);
+	mte_disable_tco_entry(current);
+	sme_enter_from_user_mode();
+}
+
 /*
  * Handle IRQ/context state management when entering from user mode.
  * Before this function is called it is not safe to call regular kernel code,
@@ -70,20 +77,30 @@ static void noinstr arm64_exit_to_kernel_mode(struct pt_regs *regs,
 static __always_inline void arm64_enter_from_user_mode(struct pt_regs *regs)
 {
 	enter_from_user_mode(regs);
+	rseq_note_user_irq_entry();
 	mte_disable_tco_entry(current);
 	sme_enter_from_user_mode();
 }
 
+static __always_inline void arm64_syscall_exit_to_user_mode(struct pt_regs *regs)
+{
+	local_irq_disable();
+	syscall_exit_to_user_mode_prepare(regs);
+	local_daif_mask();
+	sme_exit_to_user_mode();
+	mte_check_tfsr_exit();
+	exit_to_user_mode();
+}
+
 /*
  * Handle IRQ/context state management when exiting to user mode.
  * After this function returns it is not safe to call regular kernel code,
  * instrumentable code, or any code which may trigger an exception.
  */
-
 static __always_inline void arm64_exit_to_user_mode(struct pt_regs *regs)
 {
 	local_irq_disable();
-	exit_to_user_mode_prepare_legacy(regs);
+	irqentry_exit_to_user_mode_prepare(regs);
 	local_daif_mask();
 	sme_exit_to_user_mode();
 	mte_check_tfsr_exit();
@@ -92,7 +109,7 @@ static __always_inline void arm64_exit_to_user_mode(struct pt_regs *regs)
 
 asmlinkage void noinstr asm_exit_to_user_mode(struct pt_regs *regs)
 {
-	arm64_exit_to_user_mode(regs);
+	arm64_syscall_exit_to_user_mode(regs);
 }
 
 /*
@@ -716,12 +733,12 @@ static void noinstr el0_brk64(struct pt_regs *regs, unsigned long esr)
 
 static void noinstr el0_svc(struct pt_regs *regs)
 {
-	arm64_enter_from_user_mode(regs);
+	arm64_syscall_enter_from_user_mode(regs);
 	cortex_a76_erratum_1463225_svc_handler();
 	fpsimd_syscall_enter();
 	local_daif_restore(DAIF_PROCCTX);
 	do_el0_svc(regs);
-	arm64_exit_to_user_mode(regs);
+	arm64_syscall_exit_to_user_mode(regs);
 	fpsimd_syscall_exit();
 }
 
@@ -868,11 +885,11 @@ static void noinstr el0_cp15(struct pt_regs *regs, unsigned long esr)
 
 static void noinstr el0_svc_compat(struct pt_regs *regs)
 {
-	arm64_enter_from_user_mode(regs);
+	arm64_syscall_enter_from_user_mode(regs);
 	cortex_a76_erratum_1463225_svc_handler();
 	local_daif_restore(DAIF_PROCCTX);
 	do_el0_svc_compat(regs);
-	arm64_exit_to_user_mode(regs);
+	arm64_syscall_exit_to_user_mode(regs);
 }
 
 static void noinstr el0_bkpt32(struct pt_regs *regs, unsigned long esr)
diff --git a/include/linux/irq-entry-common.h b/include/linux/irq-entry-common.h
index 167fba7dbf043..1fabf0f5ea8e7 100644
--- a/include/linux/irq-entry-common.h
+++ b/include/linux/irq-entry-common.h
@@ -218,14 +218,6 @@ static __always_inline void __exit_to_user_mode_validate(void)
 	lockdep_sys_exit();
 }
 
-/* Temporary workaround to keep ARM64 alive */
-static __always_inline void exit_to_user_mode_prepare_legacy(struct pt_regs *regs)
-{
-	__exit_to_user_mode_prepare(regs, EXIT_TO_USER_MODE_WORK);
-	rseq_exit_to_user_mode_legacy();
-	__exit_to_user_mode_validate();
-}
-
 /**
  * syscall_exit_to_user_mode_prepare - call exit_to_user_mode_loop() if required
  * @regs:	Pointer to pt_regs on entry stack
diff --git a/include/linux/rseq_entry.h b/include/linux/rseq_entry.h
index 2d0295df5107c..63bc72086e75b 100644
--- a/include/linux/rseq_entry.h
+++ b/include/linux/rseq_entry.h
@@ -749,24 +749,6 @@ static __always_inline void rseq_irqentry_exit_to_user_mode(void)
 	ev->events = 0;
 }
 
-/* Required to keep ARM64 working */
-static __always_inline void rseq_exit_to_user_mode_legacy(void)
-{
-	struct rseq_event *ev = &current->rseq.event;
-
-	rseq_stat_inc(rseq_stats.exit);
-
-	if (static_branch_unlikely(&rseq_debug_enabled))
-		WARN_ON_ONCE(ev->sched_switch);
-
-	/*
-	 * Ensure that event (especially user_irq) is cleared when the
-	 * interrupt did not result in a schedule and therefore the
-	 * rseq processing did not clear it.
-	 */
-	ev->events = 0;
-}
-
 void __rseq_debug_syscall_return(struct pt_regs *regs);
 
 static __always_inline void rseq_debug_syscall_return(struct pt_regs *regs)
@@ -782,7 +764,6 @@ static inline bool rseq_exit_to_user_mode_restart(struct pt_regs *regs, unsigned
 }
 static inline void rseq_syscall_exit_to_user_mode(void) { }
 static inline void rseq_irqentry_exit_to_user_mode(void) { }
-static inline void rseq_exit_to_user_mode_legacy(void) { }
 static inline void rseq_debug_syscall_return(struct pt_regs *regs) { }
 static inline bool rseq_grant_slice_extension(unsigned long ti_work, unsigned long mask) { return false; }
 #endif /* !CONFIG_RSEQ */
-- 
2.30.2