dumpstack: x86: add "end" parameter to valid_stack_ptr and print_context_stack

- Add "end" parameter to valid_stack_ptr and print_context_stack
 - use sizeof(long) as the size of a word on the stack

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 4e67a00..466d55d 100644 (file)
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -28,10 +28,16 @@ void printk_address(unsigned long address, int reliable)
 }
 
 static inline int valid_stack_ptr(struct thread_info *tinfo,
-                       void *p, unsigned int size)
+                       void *p, unsigned int size, void *end)
 {
        void *t = tinfo;
-       return  p > t && p <= t + THREAD_SIZE - size;
+       if (end) {
+               if (p < end && p >= (end-THREAD_SIZE))
+                       return 1;
+               else
+                       return 0;
+       }
+       return p > t && p < t + THREAD_SIZE - size;
 }
 
 /* The form of the top of the frame on the stack */
@@ -43,16 +49,17 @@ struct stack_frame {
 static inline unsigned long
 print_context_stack(struct thread_info *tinfo,
                unsigned long *stack, unsigned long bp,
-               const struct stacktrace_ops *ops, void *data)
+               const struct stacktrace_ops *ops, void *data,
+               unsigned long *end)
 {
        struct stack_frame *frame = (struct stack_frame *)bp;
 
-       while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) {
+       while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
                unsigned long addr;
 
                addr = *stack;
                if (__kernel_text_address(addr)) {
-                       if ((unsigned long) stack == bp + 4) {
+                       if ((unsigned long) stack == bp + sizeof(long)) {
                                ops->address(data, addr, 1);
                                frame = frame->next_frame;
                                bp = (unsigned long) frame;
@@ -96,7 +103,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
 
                context = (struct thread_info *)
                        ((unsigned long)stack & (~(THREAD_SIZE - 1)));
-               bp = print_context_stack(context, stack, bp, ops, data);
+               bp = print_context_stack(context, stack, bp, ops, data, NULL);
                /*
                 * Should be after the line below, but somewhere
                 * in early boot context comes out corrupted and we

diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 563554c..361afa8 100644 (file)
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -141,7 +141,7 @@ print_context_stack(struct thread_info *tinfo,
 
                addr = *stack;
                if (__kernel_text_address(addr)) {
-                       if ((unsigned long) stack == bp + 8) {
+                       if ((unsigned long) stack == bp + sizeof(long)) {
                                ops->address(data, addr, 1);
                                frame = frame->next_frame;
                                bp = (unsigned long) frame;