From db8109a8bb4a4b31e7f630d7667749d62ee4a087 Mon Sep 17 00:00:00 2001 From: Glenn Washburn Date: Thu, 3 Mar 2022 01:53:31 -0600 Subject: um: port_user: Allow setting path to port-helper using UML_PORT_HELPER envvar This is useful when the uml-utilities user-space package has not been installed by the administrator and an unprivileged user wants to be able to telnet into a UML instance. The user can install the port-helper binary to a writable path and set UML_PORT_HELPER. Fallback to using hardcoded path to port-helper if environment variable is not set. Signed-off-by: Glenn Washburn Signed-off-by: Richard Weinberger --- arch/um/drivers/port_user.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch') diff --git a/arch/um/drivers/port_user.c b/arch/um/drivers/port_user.c index 0625aa42041d..3e32351dadad 100644 --- a/arch/um/drivers/port_user.c +++ b/arch/um/drivers/port_user.c @@ -167,10 +167,14 @@ static void port_pre_exec(void *arg) int port_connection(int fd, int *socket, int *pid_out) { int new, err; + char *env; char *argv[] = { "in.telnetd", "-L", OS_LIB_PATH "/uml/port-helper", NULL }; struct port_pre_exec_data data; + if ((env = getenv("UML_PORT_HELPER"))) + argv[2] = env; + new = accept(fd, NULL, 0); if (new < 0) return -errno; -- cgit v1.2.3