Patch "arm64: allow kprobes on EL0 handlers" has been added to the 5.15-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    arm64: allow kprobes on EL0 handlers

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-allow-kprobes-on-el0-handlers.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From ruanjinjie at huawei.com Wed Oct 11 12:07:43 2023
From: Jinjie Ruan <ruanjinjie at huawei.com>
Date: Wed, 11 Oct 2023 10:06:46 +0000
Subject: arm64: allow kprobes on EL0 handlers
To: <catalin.marinas at arm.com>, <will at kernel.org>, <mark.rutland at arm.com>, <broonie at kernel.org>, <anshuman.khandual at arm.com>, <alexandru.elisei at arm.com>, <sashal at kernel.org>, <maz at kernel.org>, <gregkh at linuxfoundation.org>, <james.morse at arm.com>, <pcc at google.com>, <scott at os.amperecomputing.com>, <ebiederm at xmission.com>, <haibinzhang at tencent.com>, <hewenliang4 at huawei.com>, <linux-arm-kernel at lists.infradead.org>, <linux-kernel at vger.kernel.org>, <stable at kernel.org>
Cc: <ruanjinjie at huawei.com>
Message-ID: <20231011100655.979626-7-ruanjinjie at huawei.com>

From: Mark Rutland <mark.rutland at arm.com>

commit b3a0c010e900a9f89dcd99f10bd8f7538d21b0a9 upstream.

Currently do_sysinstr() and do_cp15instr() are marked with
NOKPROBE_SYMBOL(). However, these are only called for exceptions taken
from EL0, and there is no risk of recursion in kprobes, so this is not
necessary.

Remove the NOKPROBE_SYMBOL() annotation, and rename the two functions to
more clearly indicate that these are solely for exceptions taken from
EL0, better matching the names used by the lower level entry points in
entry-common.c.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: James Morse <james.morse at arm.com>
Cc: Joey Gouly <joey.gouly at arm.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Will Deacon <will at kernel.org>
Link: https://lore.kernel.org/r/20221019144123.612388-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will at kernel.org>
Signed-off-by: Jinjie Ruan <ruanjinjie at huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/arm64/include/asm/exception.h |    4 ++--
 arch/arm64/kernel/entry-common.c   |    4 ++--
 arch/arm64/kernel/traps.c          |    6 ++----
 3 files changed, 6 insertions(+), 8 deletions(-)

--- a/arch/arm64/include/asm/exception.h
+++ b/arch/arm64/include/asm/exception.h
@@ -66,10 +66,10 @@ void do_debug_exception(unsigned long ad
 void do_fpsimd_acc(unsigned long esr, struct pt_regs *regs);
 void do_sve_acc(unsigned long esr, struct pt_regs *regs);
 void do_fpsimd_exc(unsigned long esr, struct pt_regs *regs);
-void do_sysinstr(unsigned long esr, struct pt_regs *regs);
+void do_el0_sys(unsigned long esr, struct pt_regs *regs);
 void do_sp_pc_abort(unsigned long addr, unsigned long esr, struct pt_regs *regs);
 void bad_el0_sync(struct pt_regs *regs, int reason, unsigned long esr);
-void do_cp15instr(unsigned long esr, struct pt_regs *regs);
+void do_el0_cp15(unsigned long esr, struct pt_regs *regs);
 void do_el0_svc(struct pt_regs *regs);
 void do_el0_svc_compat(struct pt_regs *regs);
 void do_el0_fpac(struct pt_regs *regs, unsigned long esr);
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -541,7 +541,7 @@ static void noinstr el0_sys(struct pt_re
 {
 	enter_from_user_mode(regs);
 	local_daif_restore(DAIF_PROCCTX);
-	do_sysinstr(esr, regs);
+	do_el0_sys(esr, regs);
 	exit_to_user_mode(regs);
 }
 
@@ -728,7 +728,7 @@ static void noinstr el0_cp15(struct pt_r
 {
 	enter_from_user_mode(regs);
 	local_daif_restore(DAIF_PROCCTX);
-	do_cp15instr(esr, regs);
+	do_el0_cp15(esr, regs);
 	exit_to_user_mode(regs);
 }
 
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -742,7 +742,7 @@ static const struct sys64_hook cp15_64_h
 	{},
 };
 
-void do_cp15instr(unsigned long esr, struct pt_regs *regs)
+void do_el0_cp15(unsigned long esr, struct pt_regs *regs)
 {
 	const struct sys64_hook *hook, *hook_base;
 
@@ -780,10 +780,9 @@ void do_cp15instr(unsigned long esr, str
 	 */
 	do_undefinstr(regs, esr);
 }
-NOKPROBE_SYMBOL(do_cp15instr);
 #endif
 
-void do_sysinstr(unsigned long esr, struct pt_regs *regs)
+void do_el0_sys(unsigned long esr, struct pt_regs *regs)
 {
 	const struct sys64_hook *hook;
 
@@ -800,7 +799,6 @@ void do_sysinstr(unsigned long esr, stru
 	 */
 	do_undefinstr(regs, esr);
 }
-NOKPROBE_SYMBOL(do_sysinstr);
 
 static const char *esr_class_str[] = {
 	[0 ... ESR_ELx_EC_MAX]		= "UNRECOGNIZED EC",


Patches currently in stable-queue which might be from ruanjinjie at huawei.com are

queue-5.15/arm64-factor-insn-read-out-of-call_undef_hook.patch
queue-5.15/arm64-rework-el0-mrs-emulation.patch
queue-5.15/arm64-die-pass-err-as-long.patch
queue-5.15/arm64-armv8_deprecated-rework-deprected-instruction-handling.patch
queue-5.15/arm64-armv8_deprecated-fix-unused-function-error.patch
queue-5.15/arm64-armv8_deprecated-move-aarch32-helper-earlier.patch
queue-5.15/arm64-consistently-pass-esr_elx-to-die.patch
queue-5.15/arm64-factor-out-el1-ssbs-emulation-hook.patch
queue-5.15/arm64-report-el1-undefs-better.patch
queue-5.15/arm64-armv8_deprecated-fold-ops-into-insn_emulation.patch
queue-5.15/arm64-rework-bti-exception-handling.patch
queue-5.15/arm64-rework-fpac-exception-handling.patch
queue-5.15/arm64-split-el0-el1-undef-handlers.patch
queue-5.15/arm64-allow-kprobes-on-el0-handlers.patch
queue-5.15/arm64-armv8_deprecated-move-emulation-functions.patch