| 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
| ||
|
Message-ID: <20230112195542.212914195@infradead.org>
Date: Thu, 12 Jan 2023 20:44:01 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: peterz@...radead.org
Cc: richard.henderson@...aro.org, ink@...assic.park.msu.ru,
mattst88@...il.com, vgupta@...nel.org, linux@...linux.org.uk,
nsekhar@...com, brgl@...ev.pl, 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, krzysztof.kozlowski@...aro.org,
alim.akhtar@...sung.com, 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, npiggin@...il.com,
christophe.leroy@...roup.eu, 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, andersson@...nel.org,
konrad.dybcio@...aro.org, anup@...infault.org,
thierry.reding@...il.com, jonathanh@...dia.com,
jacob.jun.pan@...ux.intel.com, atishp@...shpatra.org,
Arnd Bergmann <arnd@...db.de>, yury.norov@...il.com,
andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
dennis@...nel.org, tj@...nel.org, cl@...ux.com,
rostedt@...dmis.org, mhiramat@...nel.org, frederic@...nel.org,
paulmck@...nel.org, pmladek@...e.com, senozhatsky@...omium.org,
john.ogness@...utronix.de, juri.lelli@...hat.com,
vincent.guittot@...aro.org, dietmar.eggemann@....com,
bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
vschneid@...hat.com, ryabinin.a.a@...il.com, glider@...gle.com,
andreyknvl@...il.com, dvyukov@...gle.com,
vincenzo.frascino@....com,
Andrew Morton <akpm@...ux-foundation.org>, jpoimboe@...nel.org,
linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-snps-arc@...ts.infradead.org, linux-omap@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, linux-csky@...r.kernel.org,
linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
loongarch@...ts.linux.dev, 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,
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, linux-mm@...ck.org,
linux-trace-kernel@...r.kernel.org, kasan-dev@...glegroups.com
Subject: [PATCH v3 47/51] cpuidle: Ensure ct_cpuidle_enter() is always called from noinstr/__cpuidle
Tracing (kprobes included) and other compiler instrumentation relies
on a normal kernel runtime. Therefore all functions that disable RCU
should be noinstr, as should all functions that are called while RCU
is disabled.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
drivers/cpuidle/cpuidle.c | 37 ++++++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 9 deletions(-)
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -137,11 +137,13 @@ int cpuidle_find_deepest_state(struct cp
}
#ifdef CONFIG_SUSPEND
-static void enter_s2idle_proper(struct cpuidle_driver *drv,
- struct cpuidle_device *dev, int index)
+static noinstr void enter_s2idle_proper(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev, int index)
{
- ktime_t time_start, time_end;
struct cpuidle_state *target_state = &drv->states[index];
+ ktime_t time_start, time_end;
+
+ instrumentation_begin();
time_start = ns_to_ktime(local_clock());
@@ -152,13 +154,18 @@ static void enter_s2idle_proper(struct c
* suspended is generally unsafe.
*/
stop_critical_timings();
- if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
+ if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE)) {
ct_cpuidle_enter();
+ /* Annotate away the indirect call */
+ instrumentation_begin();
+ }
target_state->enter_s2idle(dev, drv, index);
if (WARN_ON_ONCE(!irqs_disabled()))
raw_local_irq_disable();
- if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
+ if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE)) {
+ instrumentation_end();
ct_cpuidle_exit();
+ }
tick_unfreeze();
start_critical_timings();
@@ -166,6 +173,7 @@ static void enter_s2idle_proper(struct c
dev->states_usage[index].s2idle_time += ktime_us_delta(time_end, time_start);
dev->states_usage[index].s2idle_usage++;
+ instrumentation_end();
}
/**
@@ -200,8 +208,9 @@ int cpuidle_enter_s2idle(struct cpuidle_
* @drv: cpuidle driver for this cpu
* @index: index into the states table in @drv of the state to enter
*/
-int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
- int index)
+noinstr int cpuidle_enter_state(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
{
int entered_state;
@@ -209,6 +218,8 @@ int cpuidle_enter_state(struct cpuidle_d
bool broadcast = !!(target_state->flags & CPUIDLE_FLAG_TIMER_STOP);
ktime_t time_start, time_end;
+ instrumentation_begin();
+
/*
* Tell the time framework to switch to a broadcast timer because our
* local timer will be shut down. If a local timer is used from another
@@ -235,15 +246,21 @@ int cpuidle_enter_state(struct cpuidle_d
time_start = ns_to_ktime(local_clock());
stop_critical_timings();
- if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
+ if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE)) {
ct_cpuidle_enter();
+ /* Annotate away the indirect call */
+ instrumentation_begin();
+ }
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))
+ if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE)) {
+ instrumentation_end();
ct_cpuidle_exit();
+ }
start_critical_timings();
sched_clock_idle_wakeup_event();
@@ -306,6 +323,8 @@ int cpuidle_enter_state(struct cpuidle_d
dev->states_usage[index].rejected++;
}
+ instrumentation_end();
+
return entered_state;
}
Powered by blists - more mailing lists