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Message-Id: <20200508123037.116783881@linuxfoundation.org>
Date: Fri, 8 May 2020 14:35:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Philipp Rudo <prudo@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 17/32] s390/ftrace: fix potential crashes when switching tracers
From: Philipp Rudo <prudo@...ux.ibm.com>
[ Upstream commit 8ebf6da9db1b2a20bb86cc1bee2552e894d03308 ]
Switching tracers include instruction patching. To prevent that a
instruction is patched while it's read the instruction patching is done
in stop_machine 'context'. This also means that any function called
during stop_machine must not be traced. Thus add 'notrace' to all
functions called within stop_machine.
Fixes: 1ec2772e0c3c ("s390/diag: add a statistic for diagnose calls")
Fixes: 38f2c691a4b3 ("s390: improve wait logic of stop_machine")
Fixes: 4ecf0a43e729 ("processor: get rid of cpu_relax_yield")
Signed-off-by: Philipp Rudo <prudo@...ux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
arch/s390/kernel/diag.c | 2 +-
arch/s390/kernel/smp.c | 4 ++--
arch/s390/kernel/trace.c | 2 +-
3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
index 35c842aa87058..4c7cf8787a848 100644
--- a/arch/s390/kernel/diag.c
+++ b/arch/s390/kernel/diag.c
@@ -128,7 +128,7 @@ void diag_stat_inc(enum diag_stat_enum nr)
}
EXPORT_SYMBOL(diag_stat_inc);
-void diag_stat_inc_norecursion(enum diag_stat_enum nr)
+void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
{
this_cpu_inc(diag_stat.counter[nr]);
trace_s390_diagnose_norecursion(diag_map[nr].code);
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index ecd24711f3aa9..8e31dfd85de32 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -393,7 +393,7 @@ int smp_find_processor_id(u16 address)
return -1;
}
-bool arch_vcpu_is_preempted(int cpu)
+bool notrace arch_vcpu_is_preempted(int cpu)
{
if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu))
return false;
@@ -403,7 +403,7 @@ bool arch_vcpu_is_preempted(int cpu)
}
EXPORT_SYMBOL(arch_vcpu_is_preempted);
-void smp_yield_cpu(int cpu)
+void notrace smp_yield_cpu(int cpu)
{
if (MACHINE_HAS_DIAG9C) {
diag_stat_inc_norecursion(DIAG_STAT_X09C);
diff --git a/arch/s390/kernel/trace.c b/arch/s390/kernel/trace.c
index 490b52e850145..11a669f3cc93c 100644
--- a/arch/s390/kernel/trace.c
+++ b/arch/s390/kernel/trace.c
@@ -14,7 +14,7 @@ EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
-void trace_s390_diagnose_norecursion(int diag_nr)
+void notrace trace_s390_diagnose_norecursion(int diag_nr)
{
unsigned long flags;
unsigned int *depth;
--
2.20.1
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