linux-kernel - [PATCH 05/36] cpuidle: Move IRQ state validation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220608144516.235041924@infradead.org>
Date:   Wed, 08 Jun 2022 16:27:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     peterz@...radead.org
Cc:     rth@...ddle.net, ink@...assic.park.msu.ru, mattst88@...il.com,
        vgupta@...nel.org, linux@...linux.org.uk,
        ulli.kroll@...glemail.com, linus.walleij@...aro.org,
        shawnguo@...nel.org, Sascha Hauer <s.hauer@...gutronix.de>,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        tony@...mide.com, khilman@...nel.org, catalin.marinas@....com,
        will@...nel.org, guoren@...nel.org, bcain@...cinc.com,
        chenhuacai@...nel.org, kernel@...0n.name, geert@...ux-m68k.org,
        sammy@...my.net, monstr@...str.eu, tsbogend@...ha.franken.de,
        dinguyen@...nel.org, jonas@...thpole.se,
        stefan.kristiansson@...nalahti.fi, shorne@...il.com,
        James.Bottomley@...senPartnership.com, deller@....de,
        mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, hca@...ux.ibm.com, gor@...ux.ibm.com,
        agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
        svens@...ux.ibm.com, ysato@...rs.sourceforge.jp, dalias@...c.org,
        davem@...emloft.net, richard@....at,
        anton.ivanov@...bridgegreys.com, johannes@...solutions.net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, jgross@...e.com, srivatsa@...il.mit.edu,
        amakhalov@...are.com, pv-drivers@...are.com,
        boris.ostrovsky@...cle.com, chris@...kel.net, jcmvbkbc@...il.com,
        rafael@...nel.org, lenb@...nel.org, pavel@....cz,
        gregkh@...uxfoundation.org, mturquette@...libre.com,
        sboyd@...nel.org, daniel.lezcano@...aro.org, lpieralisi@...nel.org,
        sudeep.holla@....com, agross@...nel.org,
        bjorn.andersson@...aro.org, anup@...infault.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        jacob.jun.pan@...ux.intel.com, Arnd Bergmann <arnd@...db.de>,
        yury.norov@...il.com, andriy.shevchenko@...ux.intel.com,
        linux@...musvillemoes.dk, rostedt@...dmis.org, pmladek@...e.com,
        senozhatsky@...omium.org, john.ogness@...utronix.de,
        paulmck@...nel.org, frederic@...nel.org, quic_neeraju@...cinc.com,
        josh@...htriplett.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com, joel@...lfernandes.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, jpoimboe@...nel.org,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, openrisc@...ts.librecores.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-um@...ts.infradead.org, linux-perf-users@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        xen-devel@...ts.xenproject.org, linux-xtensa@...ux-xtensa.org,
        linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-arch@...r.kernel.org,
        rcu@...r.kernel.org
Subject: [PATCH 05/36] cpuidle: Move IRQ state validation

Make cpuidle_enter_state() consistent with the s2idle variant and
verify ->enter() always returns with interrupts disabled.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 drivers/cpuidle/cpuidle.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -234,7 +234,11 @@ int cpuidle_enter_state(struct cpuidle_d
 	stop_critical_timings();
 	if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
 		rcu_idle_enter();
+
 	entered_state = target_state->enter(dev, drv, index);
+	if (WARN_ONCE(!irqs_disabled(), "%ps leaked IRQ state", target_state->enter))
+		raw_local_irq_disable();
+
 	if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
 		rcu_idle_exit();
 	start_critical_timings();
@@ -246,12 +250,8 @@ int cpuidle_enter_state(struct cpuidle_d
 	/* The cpu is no longer idle or about to enter idle. */
 	sched_idle_set_state(NULL);
 
-	if (broadcast) {
-		if (WARN_ON_ONCE(!irqs_disabled()))
-			local_irq_disable();
-
+	if (broadcast)
 		tick_broadcast_exit();
-	}
 
 	if (!cpuidle_state_is_coupled(drv, index))
 		local_irq_enable();