From: Nicholas Miehlbradt <nicholas@linux.ibm.com>
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: iii@linux.ibm.com, linux-kernel@vger.kernel.org,
Nicholas Miehlbradt <nicholas@linux.ibm.com>,
linux-mm@kvack.org, kasan-dev@googlegroups.com,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 09/13] powerpc: Disable KMSAN checks on functions which walk the stack
Date: Thu, 14 Dec 2023 05:55:35 +0000 [thread overview]
Message-ID: <20231214055539.9420-10-nicholas@linux.ibm.com> (raw)
In-Reply-To: <20231214055539.9420-1-nicholas@linux.ibm.com>
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 <nicholas@linux.ibm.com>
---
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, struct task_struct *tsk)
static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH;
-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 = 0;
diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index e6a958a5da27..369b8b2a1bcd 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -24,8 +24,9 @@
#include <asm/paca.h>
-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;
@@ -62,8 +63,9 @@ void __no_sanitize_address arch_stack_walk(stack_trace_consume_fn consume_entry,
*
* If the task is not 'current', the caller *must* ensure the task is inactive.
*/
-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 *cookie,
+ 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;
}
-void __no_sanitize_address
+void __no_sanitize_address __no_kmsan_checks
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
unsigned long sp, next_sp;
--
2.40.1
next prev parent reply other threads:[~2023-12-14 6:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-14 5:55 [PATCH 00/13] kmsan: Enable on powerpc Nicholas Miehlbradt
2023-12-14 5:55 ` [PATCH 01/13] kmsan: Export kmsan_handle_dma Nicholas Miehlbradt
2024-02-19 19:37 ` Christophe Leroy
2023-12-14 5:55 ` [PATCH 02/13] hvc: Fix use of uninitialized array in udbg_hvc_putc Nicholas Miehlbradt
2023-12-14 8:36 ` Christophe Leroy
2023-12-21 12:09 ` Michael Ellerman
2023-12-14 5:55 ` [PATCH 03/13] powerpc: Disable KMSAN santitization for prom_init, vdso and purgatory Nicholas Miehlbradt
2023-12-14 5:55 ` [PATCH 04/13] powerpc: Disable CONFIG_DCACHE_WORD_ACCESS when KMSAN is enabled Nicholas Miehlbradt
2023-12-14 8:42 ` Christophe Leroy
2023-12-14 5:55 ` [PATCH 05/13] powerpc: Unpoison buffers populated by hcalls Nicholas Miehlbradt
2023-12-14 5:55 ` [PATCH 06/13] powerpc/pseries/nvram: Unpoison buffer populated by rtas_call Nicholas Miehlbradt
2023-12-14 5:55 ` [PATCH 07/13] powerpc/kprobes: Unpoison instruction in kprobe struct Nicholas Miehlbradt
2023-12-15 7:51 ` Naveen N Rao
2023-12-14 5:55 ` [PATCH 08/13] powerpc: Unpoison pt_regs Nicholas Miehlbradt
2023-12-14 5:55 ` Nicholas Miehlbradt [this message]
2023-12-14 9:00 ` [PATCH 09/13] powerpc: Disable KMSAN checks on functions which walk the stack Christophe Leroy
2024-01-10 4:16 ` Nicholas Miehlbradt
2023-12-15 9:02 ` Aneesh Kumar K.V
2023-12-14 5:55 ` [PATCH 10/13] powerpc: Define KMSAN metadata address ranges for vmalloc and ioremap Nicholas Miehlbradt
2023-12-14 9:17 ` Christophe Leroy
2024-01-10 3:54 ` Nicholas Miehlbradt
2023-12-15 9:27 ` Aneesh Kumar K.V
2023-12-14 5:55 ` [PATCH 11/13] powerpc: Implement architecture specific KMSAN interface Nicholas Miehlbradt
2023-12-14 9:20 ` Christophe Leroy
2023-12-14 5:55 ` [PATCH 12/13] powerpc/string: Add KMSAN support Nicholas Miehlbradt
2023-12-14 9:25 ` Christophe Leroy
2024-01-10 4:09 ` Nicholas Miehlbradt
2023-12-14 5:55 ` [PATCH 13/13] powerpc: Enable KMSAN on powerpc Nicholas Miehlbradt
2023-12-14 9:27 ` Christophe Leroy
2024-02-20 6:39 ` [PATCH 00/13] kmsan: Enable " Christophe Leroy
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