[LTP] pty: Update slave device permission check to allow 0600

[Cyril Hrubis]

Hi!
> Systemd changed the default permissions for PTY slave devices from 0620
> to 0600 in response to CVE-2024-28085.  Allow either 0620 or 0600 as
> valid permissions.
>
> Link: https://security-tracker.debian.org/tracker/CVE-2024-28085
> Link: https://github.com/systemd/systemd/commit/a4d18914751e687c9e44f22fe4e5f95b843a45c8
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> Tested-by: Anders Roxell <anders.roxell@linaro.org>
> 
> diff --git a/testcases/kernel/pty/common.h b/testcases/kernel/pty/common.h
> index 51760b1d39fa..7cda16096d4d 100644
> --- a/testcases/kernel/pty/common.h
> +++ b/testcases/kernel/pty/common.h
> @@ -54,7 +54,8 @@ static inline int open_slave(const int masterfd)
>  			st.st_uid, uid);
>  	}
>  
> -	if (st.st_mode != (S_IFCHR | 0620)) {
> +	if (st.st_mode != (S_IFCHR | 0620) &&
> +	    st.st_mode != (S_IFCHR | 0600)) {
>  		tst_brk(TBROK, "unexpected slave device permission: %o",
>  			st.st_mode);
>  	}

Looks good to me:

Reviewed-by: Cyril Hrubis <chrubis@suse.cz>


-- 
Cyril Hrubis
chrubis@suse.cz