Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread

[Kees Cook]

On Sun, Mar 08, 2020 at 04:36:55PM -0500, Eric W. Biederman wrote:
> 
> These functions have very little to do with de_thread move them out
> of de_thread an into flush_old_exec proper so it can be more clearly
> seen what flush_old_exec is doing.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
> ---
>  fs/exec.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/exec.c b/fs/exec.c
> index ff74b9a74d34..215d86f77b63 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1189,11 +1189,6 @@ static int de_thread(struct task_struct *tsk)
>  	/* we have changed execution domain */
>  	tsk->exit_signal = SIGCHLD;
>  
> -#ifdef CONFIG_POSIX_TIMERS
> -	exit_itimers(sig);
> -	flush_itimer_signals();
> -#endif
> -
>  	BUG_ON(!thread_group_leader(tsk));
>  	return 0;
>  
> @@ -1277,6 +1272,11 @@ int flush_old_exec(struct linux_binprm * bprm)
>  	if (retval)
>  		goto out;
>  
> +#ifdef CONFIG_POSIX_TIMERS
> +	exit_itimers(me->signal);
> +	flush_itimer_signals();
> +#endif
> +

I twitch at seeing #ifdefs in .c instead of hidden in the .h declarations
of these two functions, but as this is a copy/paste, I'll live. ;)

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-Kees

>  	/*
>  	 * Make the signal table private.
>  	 */
> -- 
> 2.25.0
> 

-- 
Kees Cook