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nspawn: enable major=0/minor=0 devices inside the container (#3773)

Browse source 
https://github.com/systemd/systemd/pull/3685 introduced
/run/systemd/inaccessible/{chr,blk} to map inacessible devices,
this patch allows systemd running inside a nspawn container to create
/run/systemd/inaccessible/{chr,blk}.
This commit is contained in:
Alessandro Puccetti 2016-07-21 17:39:38 +02:00 committed by Lennart Poettering
parent 4d07c8d386
commit 31d28eabc1
3 changed files with 9 additions and 2 deletions
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1
src/core/dbus-cgroup.c
View file

@ -960,6 +960,7 @@ int bus_cgroup_set_property(
while ((r = sd_bus_message_read(message, "(ss)", &path, &rwm)) > 0) {
if ((!startswith(path, "/dev/") &&
!startswith(path, "/run/systemd/inaccessible/") &&
!startswith(path, "block-") &&
!startswith(path, "char-")) ||
strpbrk(path, WHITESPACE))

8
src/nspawn/nspawn-register.c
View file

@ -112,7 +112,7 @@ int register_machine(
* systemd-nspawn@.service, to keep the device
* policies in sync regardless if we are run with or
* without the --keep-unit switch. */
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9,
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 11,
/* Allow the container to
* access and create the API
* device nodes, so that
@ -132,7 +132,11 @@ int register_machine(
* container to ever create
* these device nodes. */
"/dev/pts/ptmx", "rw",
"char-pts", "rw");
"char-pts", "rw",
/* Allow /run/systemd/inaccessible/{chr,blk}
* devices inside the container */
"/run/systemd/inaccessible/chr", "rwm",
"/run/systemd/inaccessible/blk", "rwm");
if (r < 0)
return bus_log_create_error(r);

2
units/systemd-nspawn@.service.in
View file

@ -35,6 +35,8 @@ DeviceAllow=/dev/tty rwm
DeviceAllow=/dev/net/tun rwm
DeviceAllow=/dev/pts/ptmx rw
DeviceAllow=char-pts rw
DeviceAllow=/run/systemd/inaccessible/chr rwm
DeviceAllow=/run/systemd/inaccessible/blk rwm
# nspawn itself needs access to /dev/loop-control and /dev/loop, to
# implement the --image= option. Add these here, too.