[LTP] [PATCH v2] sigrelse01: Fix out-of-bounds read when invoking write()

[Cyril Hrubis]

Hi!
> Signed-off-by: Florian Schmaus <florian.schmaus@codasip.com>
> ---
> 
> Changes in v2:
>     - remove unnecessary '\n' in tst_resm
> 
>  testcases/kernel/syscalls/sigrelse/sigrelse01.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/sigrelse/sigrelse01.c b/testcases/kernel/syscalls/sigrelse/sigrelse01.c
> index 95754212053e..68d69c3ef5e7 100644
> --- a/testcases/kernel/syscalls/sigrelse/sigrelse01.c
> +++ b/testcases/kernel/syscalls/sigrelse/sigrelse01.c
> @@ -486,12 +486,14 @@ static void child(void)
>  	 * then PASS, otherwise FAIL.
>  	 */
>  
> -	if (exit_val == EXIT_OK) {
> -		(void)memcpy(note, (char *)sig_array, sizeof(sig_array));
> -	}
> -
>  	/* send note to parent and exit */
> -	if (write_pipe(pipe_fd[1], note) < 0) {
> +	if (exit_val == EXIT_OK) {
> +		if (write(pipe_fd[1], sig_array, sizeof(sig_array)) < 0) {
> +			tst_resm(TBROK, "write() pipe failed. error:%d %s.", errno, strerror(errno));
                                     ^
				   use | TERRNO instead of printing the
				   errno manually here.
> +			exit(WRITE_BROK);
> +		}
> +	}
> +	else if (write_pipe(pipe_fd[1], note) < 0) {

We follow LKML coding style so the proper way to write this is:

	} else if (...) {
		...
	}


Other than these two minor things the patch looks fine.

-- 
Cyril Hrubis
chrubis@suse.cz