path: root/util-linux/switch_root.c
diff options
authorGravatar Andrei Gherzan <andrei@gherzan.com>2017-03-24 16:39:08 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2017-03-24 16:39:08 +0100
commite3b65ab43d2e2d097a4cd2ee5aa1e1606a8a0663 (patch)
tree0cccd93b486de5994a8f5c998a78a85f479fadf2 /util-linux/switch_root.c
parent876c121ccb479d667a1ab00d0cb2d9cb1c298e7d (diff)
switch_root: don't bail out when console doesn't exist
Busybox is very often used in initramfs at the end of which usually there is a switch_root to the actual rootfs. There are many cases where the console kernel argument is either just a placeholder (for example RaspberryPi uses serial0 and serial1) or configured as null to avoid any console messages - usually you would see such of a setup in production environments. Currently busybox bails out if can't open the console argument. If this happenes in initramfs and if the console=null for example, you get in a blind kernel panic. Avoid this by only warning instead of dying. function old new delta switch_root_main 371 368 -3 Signed-off-by: Andrei Gherzan <andrei@gherzan.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux/switch_root.c')
1 files changed, 6 insertions, 4 deletions
diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index 6034485d7..aaee35a3e 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -141,10 +141,12 @@ int switch_root_main(int argc UNUSED_PARAM, char **argv)
// If a new console specified, redirect stdin/stdout/stderr to it
if (console) {
- close(0);
- xopen(console, O_RDWR);
- xdup2(0, 1);
- xdup2(0, 2);
+ int fd = open_or_warn(console, O_RDWR);
+ if (fd >= 0) {
+ xmove_fd(fd, 0);
+ xdup2(0, 1);
+ xdup2(0, 2);
+ }
// Exec real init