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-rw-r--r--mm/kasan/kasan.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 0e9505f66ec1..b2a0cff2bb35 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -80,7 +80,14 @@ void kasan_unpoison_task_stack(struct task_struct *task)
/* Unpoison the stack for the current task beyond a watermark sp value. */
asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
{
- __kasan_unpoison_stack(current, watermark);
+ /*
+ * Calculate the task stack base address. Avoid using 'current'
+ * because this function is called by early resume code which hasn't
+ * yet set up the percpu register (%gs).
+ */
+ void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1));
+
+ kasan_unpoison_shadow(base, watermark - base);
}
/*