Unchecked return value
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Time of check time of use
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Unchecked return value
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Unused value
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Logically dead code
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Add inline setns() function to tool_utils.h. Without it
tool_utils.c can't be build when HAVE_SETNS is unset.
Signed-off-by: Serj Kalichev <serj.kalichev@gmail.com>

Signed-off-by: LiFeng <lifeng68@huawei.com>

Signed-off-by: LiFeng <lifeng68@huawei.com>

Signed-off-by: Daniel Selifonov <ds@thyth.com>

Fixes: #2277
Signed-off-by: Jonathan Calmels <jcalmels@nvidia.com>

lxc_monitor.c uses offsetof(), so it should include
<stddef.h>. Otherwise the build fails with the musl C library:

tools/lxc_monitor.c: In function ‘lxc_abstract_unix_connect’:
tools/lxc_monitor.c:324:9: warning: implicit declaration of function ‘offsetof’ [-Wimplicit-function-declaration]
         offsetof(struct sockaddr_un, sun_path) + len + 1);
         ^~~~~~~~
tools/lxc_monitor.c:324:18: error: expected expression before ‘struct’
         offsetof(struct sockaddr_un, sun_path) + len + 1);
                  ^~~~~~
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Always use 022 as the umask when creating the rootfs directory and
executing the template. A too loose umask may cause security issues.
A too strict umask may cause programs to fail inside the container.
Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>

Signed-off-by: Felix Abecassis <fabecassis@nvidia.com>

LXC generates and loads the seccomp-bpf filter in the host/container which
spawn the new container. In other words, userspace N is responsible for
generating and loading the seccomp-bpf filter which restricts userspace N + 1.
Assume 64bit kernel and 32bit userspace running a 64bit container. In this case
the 32-bit x86 userspace is used to create a seccomp-bpf filter for a 64-bit
userspace. Unless one explicitly adds the 64-bit ABI to the libseccomp filter,
or adjusts the default behavior for "BAD_ARCH", *all* 64-bit x86 syscalls will
be blocked.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Suggested-by: Paul Moore <paul@paul-moore.com>

Rename "compat_ctx" to "contexts" and "compat_arch" to "architectures".
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Closes #2280.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

This commit deals with different kernel and userspace layouts and nesting. Here
are three examples:
1. 64bit kernel and 64bit userspace running 32bit containers
2. 64bit kernel and 32bit userspace running 64bit containers
3. 64bit kernel and 64bit userspace running 32bit containers running 64bit containers
Two things to lookout for:
1. The compat arch that is detected might have already been present in the main
   context. So check that it actually hasn't been and only then add it.
2. The contexts don't need merging if the architectures are the same and also can't be.
With these changes I can run all crazy/weird combinations with proper seccomp
isolation.

Closes #654.

Link: https://bugs.chromium.org/p/chromium/issues/detail?id=832366Reported-by: Chirantan Ekbote <chirantan@chromium.org>
Reported-by: Sonny Rao <sonnyrao@chromium.org>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Jakub Skokan <jakub.skokan@havefun.cz>

When starting application containers without a mapping for container root are
started, a dummy bind-mount target for lxc-init needs to be created. This will
not always work directly under "/" when e.g. permissions are missing due to the
ownership and/or mode of "/". We can try to work around this by using the
P_tmpdir as defined in POSIX which should usually land us in /tmp where
basically everyone can create files.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

We should always default to mounting devpts with gid=5 but we should fallback
to mounting without gid=5. This let's us cover use-cases such as container
started with only a single mapping e.g.:

lxc.idmap = u 1000 1000 1
lxc.idmap = g 1000 1000 1

Closes #2257.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Closes #2248.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Closes #2262.
Signed-off-by: C0deAi <techsupport@mycode.ai>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Closes #2262.
Signed-off-by: C0deAi <techsupport@mycode.ai>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Value stored is never read.

Closes #2262.
Signed-off-by: C0deAi <techsupport@mycode.ai>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Closes #1704.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Commit c06ed219 has broken
compilation with a static libcap and a shared gnutls.
This results in a build failure on init_lxc_static if gnutls is
a shared library as init_lxc_static is built with -all-static option
(see src/lxc/Makefile.am) and AC_CHECK_LIB adds gnutls to LIBS.

This commit fix the issue by removing default behavior of AC_CHECK_LIB
and handling manually GNUTLS_LIBS and HAVE_LIBGNUTLS

Fixes:
 - http://autobuild.buildroot.net/results/b655d6853c25a195df28d91512b3ffb6c654fc90Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

lxc_make_tmpfile() uses mkstemp() internally, and thus expects the
template to contain 'XXXXXX' and be writable.
Signed-off-by: Thomas Moschny <thomas.moschny@gmx.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

lxc_make_tmpfile() uses mkstemp() internally, and thus expects the
template to contain 'XXXXXX' and be writable.
Signed-off-by: Thomas Moschny <thomas.moschny@gmx.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

On NFS, avoid random names of the root pin file due to "NFS silly renaming" but use a fixed hidden name instead.

The problem here is that these two clauses were ordered backwards: we first
check if the signal came from not the init pid, and if it did, then we give
a notice and return. The comment notes that this is intended to protect
against SIGCHLD, but we don't in fact know if the signal is a SIGCHLD yet,
because that's tested in the next hunk.

The symptom is that if I e.g. send SIGTERM from the outside world to the
container init, it ignores it and gives this notice. If we re-order these
clauses, it forwards non SIGCHLD signals, and ignores SIGCHLD signals from
things that aren't the real container process.
Signed-off-by: Tycho Andersen <tycho@tycho.ws>

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>

Signed-off-by: Fengtu Wang <wangfengtu@huawei.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

If they aren't available fallback to BSD flock()s.

Closes #2245.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Felix Abecassis <fabecassis@nvidia.com>