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sched: Add wrapper for get_wchan() to keep task blocked

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Having a stable wchan means the process must be blocked and for it to
stay that way while performing stack unwinding.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> [arm]
Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64]
Link: https://lkml.kernel.org/r/20211008111626.332092234@infradead.org
This commit is contained in:
Kees Cook
2021-09-29 15:02:14 -07:00
committed by Peter Zijlstra
parent bc9bbb8173
commit 42a20f86dc
50 changed files with 80 additions and 112 deletions
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12
arch/riscv/kernel/stacktrace.c
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@@ -128,16 +128,14 @@ static bool save_wchan(void *arg, unsigned long pc)
return true;
}
unsigned long get_wchan(struct task_struct *task)
unsigned long __get_wchan(struct task_struct *task)
{
unsigned long pc = 0;
if (likely(task && task != current && !task_is_running(task))) {
if (!try_get_task_stack(task))
return 0;
walk_stackframe(task, NULL, save_wchan, &pc);
put_task_stack(task);
}
if (!try_get_task_stack(task))
return 0;
walk_stackframe(task, NULL, save_wchan, &pc);
put_task_stack(task);
return pc;
}