diff options
| author | Helge Deller <deller@gmx.de> | 2017-09-17 21:05:02 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2017-09-22 19:46:16 +0200 |
| commit | e77900abfd8be4e207412d8b7752dbb9838e2571 (patch) | |
| tree | 58cf7e11b76f139bfc5b28e033ea053d1b5c398e /arch | |
| parent | parisc: Fix too large frame size warnings (diff) | |
| download | linux-e77900abfd8be4e207412d8b7752dbb9838e2571.tar.xz linux-e77900abfd8be4e207412d8b7752dbb9838e2571.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/kernel/unwind.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c index 48dc7d4d20bb..caab39dfa95d 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; |