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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 92302606DB; Thu, 14 Dec 2023 16:56:19 +1100 (AEDT) From: Nicholas Miehlbradt To: glider@google.com, elver@google.com, dvyukov@google.com, akpm@linux-foundation.org, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu Cc: linux-mm@kvack.org, kasan-dev@googlegroups.com, iii@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Nicholas Miehlbradt Subject: [PATCH 09/13] powerpc: Disable KMSAN checks on functions which walk the stack Date: Thu, 14 Dec 2023 05:55:35 +0000 Message-Id: <20231214055539.9420-10-nicholas@linux.ibm.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231214055539.9420-1-nicholas@linux.ibm.com> References: <20231214055539.9420-1-nicholas@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: bbcuSHGLeoKEVuj7srCG-ZCZayTjEdOS X-Proofpoint-GUID: KH91wVFkQGDFAZOFPfyiwzBaXkKHaRsA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-14_02,2023-12-13_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 priorityscore=1501 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312140035 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Functions which walk the stack read parts of the stack which cannot be instrumented by KMSAN e.g. the backchain. Disable KMSAN sanitization of these functions to prevent false positives. Signed-off-by: Nicholas Miehlbradt --- arch/powerpc/kernel/process.c | 6 +++--- arch/powerpc/kernel/stacktrace.c | 10 ++++++---- arch/powerpc/perf/callchain.c | 2 +- 3 files changed, 10 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 392404688cec..3dc88143c3b2 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -2276,9 +2276,9 @@ static bool empty_user_regs(struct pt_regs *regs, str= uct task_struct *tsk) =20 static int kstack_depth_to_print =3D CONFIG_PRINT_STACK_DEPTH; =20 -void __no_sanitize_address show_stack(struct task_struct *tsk, - unsigned long *stack, - const char *loglvl) +void __no_sanitize_address __no_kmsan_checks show_stack(struct task_struct= *tsk, + unsigned long *stack, + const char *loglvl) { unsigned long sp, ip, lr, newsp; int count =3D 0; diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktr= ace.c index e6a958a5da27..369b8b2a1bcd 100644 --- a/arch/powerpc/kernel/stacktrace.c +++ b/arch/powerpc/kernel/stacktrace.c @@ -24,8 +24,9 @@ =20 #include =20 -void __no_sanitize_address arch_stack_walk(stack_trace_consume_fn consume_= entry, void *cookie, - struct task_struct *task, struct pt_regs *regs) +void __no_sanitize_address __no_kmsan_checks + arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, + struct task_struct *task, struct pt_regs *regs) { unsigned long sp; =20 @@ -62,8 +63,9 @@ void __no_sanitize_address arch_stack_walk(stack_trace_co= nsume_fn consume_entry, * * If the task is not 'current', the caller *must* ensure the task is inac= tive. */ -int __no_sanitize_address arch_stack_walk_reliable(stack_trace_consume_fn = consume_entry, - void *cookie, struct task_struct *task) +int __no_sanitize_address __no_kmsan_checks + arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cook= ie, + struct task_struct *task) { unsigned long sp; unsigned long newsp; diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index 6b4434dd0ff3..c7610b38e9b8 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -40,7 +40,7 @@ static int valid_next_sp(unsigned long sp, unsigned long = prev_sp) return 0; } =20 -void __no_sanitize_address +void __no_sanitize_address __no_kmsan_checks perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_re= gs *regs) { unsigned long sp, next_sp; --=20 2.40.1