If the handler closes the file descriptor for the peer or master fd it is
crucial that we mark it as -EBADF. This will prevent lxc_console_delete()
from calling close() on an already closed file descriptor again. I've
observed the double close in the attach code.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
It seems dangerous to use alloca() as the arguments can be of indeterminate
length and we might blow up the stack.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Make sure that we allocate the buffer **after** we determined how much space we
need in total.
This fixes a SIGBUS/SIGSEGV Stéphane reported on aarch64 and armf.
Reported-by: Stéphane Graber <stgraber@ubuntu.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
If a file descriptor fd is opened by fdopen() and associated with a stream f
will **not** have been dup()ed. This means that fclose(f) will also close the
fd. So never call close(fd) after fdopen(fd) succeeded.
This fixes a double close() Stéphane and I observed when debugging on aarch64
and armf.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This lets users specify
lxc.mount.auto = cgroup:mixed:force
or
lxc.mount.auto = cgroup:ro:force
or
lxc.mount.auto = cgroup:rw:force
When cgroup namespaces are supported LXC will not mount cgroups for the
container since it assumes that the init system will mount cgroups itself if it
wants to. This assumption already broke when users wanted to run containers
without CAP_SYS_ADMIN. For example, systemd based containers wouldn't start
since systemd needs to mount cgroups (named systemd hierarchy for legacy
cgroups and the unified hierarchy for unified cgroups) to track processes. This
problem was solved by detecting whether the container had CAP_SYS_ADMIN. If it
didn't we performed the cgroup mounts for it.
However, there are more cases when we should be able to mount cgroups for the
container when cgroup namespaces are supported:
- init systems not mounting cgroups themselves:
A init system that doesn't mount cgroups would not have cgroups available
especially when combined with custom LSM profiles to prevent cgroup
{u}mount()ing inside containers.
- application containers:
Application containers will usually not mount by cgroups themselves.
- read-only cgroups:
It is useful to be able to mount cgroups read-only to e.g. prevent
changing cgroup limits from inside the container while at the same time
allowing the applications to perform introspection on their own cgroups. This
again is mostly useful for application containers. System containers running
systemd will usually not work correctly when cgroups are mounted read-only.
To be fair, all of those use-cases could be covered by custom hooks or
lxc.mount.entry entries but exposing it through lxc.mount.auto takes care of
setting correct mount options and adding the necessary logic to e.g. mount
filesystem read-only correctly.
Currently we only extend this to cgroup:{mixed,ro,rw} but technically there's
no reason not to enable the same behavior for cgroup-full:{mixed,ro,rw} as
well. If someone requests this we can simply treat it as a bug and add "force"
for cgroup-full.
Replaces #2136.
Signed-off-by: Shukui Yang <yangshukui@huawei.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
