Check stack pointer if we are reaching the stack end and stop unwinding
if we do. This fixes early backtraces and avoids showing unrealistic
call stacks.
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index 48dc7d4..caab39d 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/kallsyms.h>
#include <linux/sort.h>
+#include <linux/sched.h>
#include <linux/uaccess.h>
#include <asm/assembly.h>
@@ -279,6 +280,17 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
info->prev_sp = sp - 64;
info->prev_ip = 0;
+
+ /* The stack is at the end inside the thread_union
+ * struct. If we reach data, we have reached the
+ * beginning of the stack and should stop unwinding. */
+ if (info->prev_sp >= (unsigned long) task_thread_info(info->t) &&
+ info->prev_sp < ((unsigned long) task_thread_info(info->t)
+ + THREAD_SZ_ALGN)) {
+ info->prev_sp = 0;
+ break;
+ }
+
if (get_user(tmp, (unsigned long *)(info->prev_sp - RP_OFFSET)))
break;
info->prev_ip = tmp;
--
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