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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 66E6A6010B; Mon, 6 Feb 2023 13:18:14 +1100 (AEDT) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 1/5] powerpc: kcsan: Add exclusions from instrumentation Date: Mon, 6 Feb 2023 13:17:57 +1100 Message-Id: <20230206021801.105268-2-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230206021801.105268-1-rmclure@linux.ibm.com> References: <20230206021801.105268-1-rmclure@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 8VP2LXKuAfSCqt61eV70rGKqkRX8xyuu X-Proofpoint-ORIG-GUID: AJzVfTXslAYAc22QSCWjbGy1dmJ-IXy- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-06_01,2023-02-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=440 lowpriorityscore=0 malwarescore=0 adultscore=0 suspectscore=0 phishscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 mlxscore=0 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302060018 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rohan McLure , npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Exclude various incompatible compilation units from KCSAN instrumentation. Signed-off-by: Rohan McLure --- arch/powerpc/kernel/Makefile | 10 ++++++++++ arch/powerpc/kernel/trace/Makefile | 1 + arch/powerpc/kernel/vdso/Makefile | 1 + arch/powerpc/lib/Makefile | 2 ++ arch/powerpc/purgatory/Makefile | 1 + arch/powerpc/xmon/Makefile | 1 + 6 files changed, 16 insertions(+) diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 9b6146056e48..9bf2be123093 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -54,6 +54,13 @@ CFLAGS_cputable.o += -DDISABLE_BRANCH_PROFILING CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING endif +KCSAN_SANITIZE_early_32.o := n +KCSAN_SANITIZE_early_64.o := n +KCSAN_SANITIZE_cputable.o := n +KCSAN_SANITIZE_btext.o := n +KCSAN_SANITIZE_paca.o := n +KCSAN_SANITIZE_setup_64.o := n + #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET # Remove stack protector to avoid triggering unneeded stack canary # checks due to randomize_kstack_offset. @@ -177,12 +184,15 @@ obj-$(CONFIG_PPC_SECVAR_SYSFS) += secvar-sysfs.o # Disable GCOV, KCOV & sanitizers in odd or sensitive code GCOV_PROFILE_prom_init.o := n KCOV_INSTRUMENT_prom_init.o := n +KCSAN_SANITIZE_prom_init.o := n UBSAN_SANITIZE_prom_init.o := n GCOV_PROFILE_kprobes.o := n KCOV_INSTRUMENT_kprobes.o := n +KCSAN_SANITIZE_kprobes.o := n UBSAN_SANITIZE_kprobes.o := n GCOV_PROFILE_kprobes-ftrace.o := n KCOV_INSTRUMENT_kprobes-ftrace.o := n +KCSAN_SANITIZE_kprobes-ftrace.o := n UBSAN_SANITIZE_kprobes-ftrace.o := n GCOV_PROFILE_syscall_64.o := n KCOV_INSTRUMENT_syscall_64.o := n diff --git a/arch/powerpc/kernel/trace/Makefile b/arch/powerpc/kernel/trace/Makefile index af8527538fe4..b16a9f9c0b35 100644 --- a/arch/powerpc/kernel/trace/Makefile +++ b/arch/powerpc/kernel/trace/Makefile @@ -23,4 +23,5 @@ obj-$(CONFIG_PPC32) += $(obj32-y) # Disable GCOV, KCOV & sanitizers in odd or sensitive code GCOV_PROFILE_ftrace.o := n KCOV_INSTRUMENT_ftrace.o := n +KCSAN_SANITIZE_ftrace.o := n UBSAN_SANITIZE_ftrace.o := n diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile index 6a977b0d8ffc..3a2f32929fcf 100644 --- a/arch/powerpc/kernel/vdso/Makefile +++ b/arch/powerpc/kernel/vdso/Makefile @@ -46,6 +46,7 @@ GCOV_PROFILE := n KCOV_INSTRUMENT := n UBSAN_SANITIZE := n KASAN_SANITIZE := n +KCSAN_SANITIZE := n ccflags-y := -shared -fno-common -fno-builtin -nostdlib -Wl,--hash-style=both ccflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld) diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index 4de71cbf6e8e..c4db459d304a 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -16,6 +16,8 @@ KASAN_SANITIZE_feature-fixups.o := n # restart_table.o contains functions called in the NMI interrupt path # which can be in real mode. Disable KASAN. KASAN_SANITIZE_restart_table.o := n +KCSAN_SANITIZE_code-patching.o := n +KCSAN_SANITIZE_feature-fixups.o := n ifdef CONFIG_KASAN CFLAGS_code-patching.o += -DDISABLE_BRANCH_PROFILING diff --git a/arch/powerpc/purgatory/Makefile b/arch/powerpc/purgatory/Makefile index a81d155b89ae..6f5e2727963c 100644 --- a/arch/powerpc/purgatory/Makefile +++ b/arch/powerpc/purgatory/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 KASAN_SANITIZE := n +KCSAN_SANITIZE := n targets += trampoline_$(BITS).o purgatory.ro diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile index eb25d7554ffd..d334de392e6c 100644 --- a/arch/powerpc/xmon/Makefile +++ b/arch/powerpc/xmon/Makefile @@ -5,6 +5,7 @@ GCOV_PROFILE := n KCOV_INSTRUMENT := n UBSAN_SANITIZE := n KASAN_SANITIZE := n +KCSAN_SANITIZE := n # Disable ftrace for the entire directory ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE) From patchwork Mon Feb 6 02:17:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rohan McLure X-Patchwork-Id: 1737995 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 76DC7606E6; Mon, 6 Feb 2023 13:18:14 +1100 (AEDT) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 2/5] powerpc: kcsan: Exclude udelay to prevent recursive instrumentation Date: Mon, 6 Feb 2023 13:17:58 +1100 Message-Id: <20230206021801.105268-3-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230206021801.105268-1-rmclure@linux.ibm.com> References: <20230206021801.105268-1-rmclure@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0VeUQHY8JkDLkwgYSnGAkBPbPyqkshFF X-Proofpoint-ORIG-GUID: b4w0rmhdrmJsd1vfBzY801DBDKqyTJUL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-06_01,2023-02-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 bulkscore=0 phishscore=0 mlxlogscore=954 clxscore=1015 impostorscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302060018 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rohan McLure , npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" In order for KCSAN to increase its likelihood of observing a data race, it sets a watchpoint on memory accesses and stalls, allowing for detection of conflicting accesses by other kernel threads or interrupts. Stalls are implemented by injecting a call to udelay in instrumented code. To prevent recursive instrumentation, exclude udelay from being instrumented. Signed-off-by: Rohan McLure --- arch/powerpc/kernel/time.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index d68de3618741..b894029f53db 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -356,7 +356,7 @@ void vtime_flush(struct task_struct *tsk) } #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ -void __delay(unsigned long loops) +void __no_kcsan __delay(unsigned long loops) { unsigned long start; @@ -377,7 +377,7 @@ void __delay(unsigned long loops) } EXPORT_SYMBOL(__delay); -void udelay(unsigned long usecs) +void __no_kcsan udelay(unsigned long usecs) { __delay(tb_ticks_per_usec * usecs); } From patchwork Mon Feb 6 02:17:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rohan McLure X-Patchwork-Id: 1737992 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 7E731606E7; Mon, 6 Feb 2023 13:18:14 +1100 (AEDT) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 3/5] powerpc: kcsan: Memory barriers semantics Date: Mon, 6 Feb 2023 13:17:59 +1100 Message-Id: <20230206021801.105268-4-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230206021801.105268-1-rmclure@linux.ibm.com> References: <20230206021801.105268-1-rmclure@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 7CfBXsVqvhK8k0QAZByM8w7wsQFVZuvH X-Proofpoint-ORIG-GUID: eqWq9CQwyJi12PDMy5S2DkWjI-BZZj2U X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-06_01,2023-02-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=921 lowpriorityscore=0 malwarescore=0 adultscore=0 suspectscore=0 phishscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 mlxscore=0 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302060018 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rohan McLure , npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Annotate memory barriers *mb() with calls to kcsan_mb(), signaling to compilers supporting KCSAN that the respective memory barrier has been issued. Rename memory barrier *mb() to __*mb() to opt in for asm-generic/barrier.h to generate the respective *mb() macro. Signed-off-by: Rohan McLure --- v2: Implement __smp_mb() in terms of __mb() to avoid duplicate calls to kcsan_mb() --- arch/powerpc/include/asm/barrier.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index e80b2c0e9315..b95b666f0374 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -35,9 +35,9 @@ * However, on CPUs that don't support lwsync, lwsync actually maps to a * heavy-weight sync, so smp_wmb() can be a lighter-weight eieio. */ -#define mb() __asm__ __volatile__ ("sync" : : : "memory") -#define rmb() __asm__ __volatile__ ("sync" : : : "memory") -#define wmb() __asm__ __volatile__ ("sync" : : : "memory") +#define __mb() __asm__ __volatile__ ("sync" : : : "memory") +#define __rmb() __asm__ __volatile__ ("sync" : : : "memory") +#define __wmb() __asm__ __volatile__ ("sync" : : : "memory") /* The sub-arch has lwsync */ #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_E500MC) @@ -51,12 +51,12 @@ /* clang defines this macro for a builtin, which will not work with runtime patching */ #undef __lwsync #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") -#define dma_rmb() __lwsync() -#define dma_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory") +#define __dma_rmb() __lwsync() +#define __dma_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory") #define __smp_lwsync() __lwsync() -#define __smp_mb() mb() +#define __smp_mb() __mb() #define __smp_rmb() __lwsync() #define __smp_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory") From patchwork Mon Feb 6 02:18:00 2023 Content-Type: text/plain; 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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 8BBF760636; Mon, 6 Feb 2023 13:18:14 +1100 (AEDT) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 4/5] powerpc: kcsan: Prevent recursive instrumentation with IRQ save/restores Date: Mon, 6 Feb 2023 13:18:00 +1100 Message-Id: <20230206021801.105268-5-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230206021801.105268-1-rmclure@linux.ibm.com> References: <20230206021801.105268-1-rmclure@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: W7PpaC4WRXN0_Fd05navtLgFzLLNNnO5 X-Proofpoint-ORIG-GUID: 7pIcuSn1LWDgc6t-TaUs8uYAxxGsuyE0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-06_01,2023-02-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 spamscore=0 priorityscore=1501 bulkscore=0 adultscore=0 mlxscore=0 mlxlogscore=718 phishscore=0 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302060018 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rohan McLure , npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Instrumented memory accesses provided by KCSAN will access core-local memories (which will save and restore IRQs) as well as restoring IRQs directly. Avoid recursive instrumentation by applying __no_kcsan annotation to IRQ restore routines. Signed-off-by: Rohan McLure --- arch/powerpc/kernel/irq_64.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/irq_64.c b/arch/powerpc/kernel/irq_64.c index eb2b380e52a0..3a1e0bffe9e0 100644 --- a/arch/powerpc/kernel/irq_64.c +++ b/arch/powerpc/kernel/irq_64.c @@ -97,7 +97,7 @@ static inline bool irq_happened_test_and_clear(u8 irq) return false; } -void replay_soft_interrupts(void) +__no_kcsan void replay_soft_interrupts(void) { struct pt_regs regs; @@ -185,7 +185,7 @@ void replay_soft_interrupts(void) } #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_KUAP) -static inline void replay_soft_interrupts_irqrestore(void) +__no_kcsan static inline void replay_soft_interrupts_irqrestore(void) { unsigned long kuap_state = get_kuap(); @@ -209,7 +209,7 @@ static inline void replay_soft_interrupts_irqrestore(void) #define replay_soft_interrupts_irqrestore() replay_soft_interrupts() #endif -notrace void arch_local_irq_restore(unsigned long mask) +notrace __no_kcsan void arch_local_irq_restore(unsigned long mask) { unsigned char irq_happened; 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Mon, 6 Feb 2023 02:18:20 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EAA7020040; Mon, 6 Feb 2023 02:18:19 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 6 Feb 2023 02:18:19 +0000 (GMT) Received: from civic.. (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 944C4606E9; Mon, 6 Feb 2023 13:18:14 +1100 (AEDT) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 5/5] powerpc: kcsan: Add KCSAN Support Date: Mon, 6 Feb 2023 13:18:01 +1100 Message-Id: <20230206021801.105268-6-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230206021801.105268-1-rmclure@linux.ibm.com> References: <20230206021801.105268-1-rmclure@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: SHjL4B3WLgxbxOv2btC-bSL3Ve3-Z4iX X-Proofpoint-ORIG-GUID: 4vUDioMIelix9JtzvanQ1NIWCoR67Eoc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-06_01,2023-02-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 bulkscore=0 phishscore=0 mlxlogscore=814 clxscore=1015 impostorscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302060018 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rohan McLure , npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Enable HAVE_ARCH_KCSAN on all powerpc platforms, permitting use of the kernel concurrency sanitiser through the CONFIG_KCSAN_* kconfig options. KCSAN requires compiler builtins __atomic_* 64-bit values, and so only report support on PPC64. See documentation in Documentation/dev-tools/kcsan.rst for more information. Signed-off-by: Rohan McLure --- v3: Restrict support to 64-bit, as TSAN expects 64-bit __atomic_* compiler built-ins. --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index b8c4ac56bddc..55bc2d724c73 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -198,6 +198,7 @@ config PPC select HAVE_ARCH_KASAN if PPC_RADIX_MMU select HAVE_ARCH_KASAN if PPC_BOOK3E_64 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN + select HAVE_ARCH_KCSAN if PPC64 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET select HAVE_ARCH_KGDB