Jann Horn 5bf2a45e33 selftests/seccomp: Don't call read() on TTY from background pgrp
commit 2bfed7d2ffa5d86c462d3e2067f2832eaf8c04c7 upstream.

Since commit 92d25637a3a4 ("kselftest: signal all child processes"), tests
are executed in background process groups. This means that trying to read
from stdin now throws SIGTTIN when stdin is a TTY, which breaks some
seccomp selftests that try to use read(0, NULL, 0) as a dummy syscall.

The simplest way to fix that is probably to just use -1 instead of 0 as
the dummy read()'s FD.

Fixes: 92d25637a3a4 ("kselftest: signal all child processes")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220319010011.1374622-1-jannh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-05-12 12:25:39 +02:00
..
2020-08-22 10:53:12 +01:00
2021-05-22 11:40:55 +02:00