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@xxxxxxxxxxxxx>
---
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
