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parisc: Stop unwinding at start of stack 

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@gmx.de>
This commit is contained in:
Helge Deller 2017-09-17 21:05:02 +02:00
parent 432654df90
commit e77900abfd
1 changed files with 12 additions and 0 deletions
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12
arch/parisc/kernel/unwind.c
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@ -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;