The setRecAttr is only called for "bind" case, as cases end with a
return statement. Indeed, recursive mount attributes only make sense for
bind mounts.
Move the code to under case "bind" to improve readability. No change in
logic.
Fixes: 382eba4354
Reported-by: Sebastiaan van Stijn <github@gone.nl>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
There is some kind of a race in CentOS 7 which sometimes result in one
of these tests failing like this:
systemd_test.go:136: mkdir /sys/fs/cgroup/hugetlb/system.slice/system-runc_test_pods.slice: no such file or directory
or
systemd_test.go:187: open /sys/fs/cgroup/cpuset/system.slice/system-runc_test_pods.slice/cpuset.mems: no such file or directory
As this is only happening on CentOS 7, let's skip this test on this
platform.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Commit 3291d66b98 introduced a check for /proc and /sys, making sure
the destination (dest) is a directory (and not e.g. a symlink).
Later, a hunk from commit 0ca91f44f switched from using filepath.Join
to SecureJoin for dest. As SecureJoin follows and resolves symlinks,
the check whether dest is a symlink no longer works.
To fix, do the check without/before using SecureJoin.
Add integration tests to make sure we won't regress.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Older kernels may return EINVAL on unshare when a process is reading
runc's /proc/$PID/status or /proc/$PID/maps. This was fixed by kernel
commit 12c641ab8270f ("unshare: Unsharing a thread does not require
unsharing a vm") in Linuxt v4.3.
For CentOS 7, the fix was backported to CentOS 7.7 (kernel 3.10.0-1062).
To work around this kernel bug, let's retry on EINVAL a few times.
Reported-by: zzyyzte <zhang.yu58@zte.com.cn>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
It was found that rootless runc makes `/sys/fs/cgroup` writable in following conditons:
1. when runc is executed inside the user namespace, and the config.json does not specify the cgroup namespace to be unshared
(e.g.., `(docker|podman|nerdctl) run --cgroupns=host`, with Rootless Docker/Podman/nerdctl)
2. or, when runc is executed outside the user namespace, and `/sys` is mounted with `rbind, ro`
(e.g., `runc spec --rootless`; this condition is very rare)
A container may gain the write access to user-owned cgroup hierarchy `/sys/fs/cgroup/user.slice/...` on the host.
Other users's cgroup hierarchies are not affected.
To fix the issue, this commit does:
1. Remount `/sys/fs/cgroup` to apply `MS_RDONLY` when it is being bind-mounted
2. Mask `/sys/fs/cgroup` when the bind source is unavailable
Fix CVE-2023-25809 (GHSA-m8cg-xc2p-r3fc)
Co-authored-by: Kir Kolyshkin <kolyshkin@gmail.com>
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
The purpose of this test is to check that there are no extra file
descriptors left open after repeated calls to runContainer. In fact,
the first call to runContainer leaves a few file descriptors opened,
and this is by design.
Previously, this test relied on two things:
1. some other tests were run before it (and thus all such opened-once
file descriptors are already opened);
2. explicitly excluding fd opened to /sys/fs/cgroup.
Now, if we run this test separately, it will fail (because of 1 above).
The same may happen if the tests are run in a random order.
To fix this, add a container run before collection the initial fd list,
so those fds that are opened once are included and won't be reported.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
stage_2_pid is not yet assigned, so this kills the PID -1, but as
the sane_kill() wrapper is just a nop in that case. Just remove these
calls to kill stage_2_pid before it is cloned/assigned.
I've checked by executing the error paths that no binary is left by mistake.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
centos-9 unit test sometimes fails with:
=== RUN TestPodSkipDevicesUpdate
systemd_test.go:114: container stderr not empty: basename: missing operand
Try 'basename --help' for more information.
--- FAIL: TestPodSkipDevicesUpdate (0.11s)
I'm not sure why the container output is an error in basename. It seems
likely that the bashrc in that distro is kind of broken. Let's just run
a sleep command and forget about bash.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
In 18c4760a (libct: fixStdioPermissions: skip chown if not needed)
the check whether the STDIO file descriptors point to /dev/null was
removed which can cause /dev/null to change ownership e.g. when using
docker exec on a running container:
$ ls -l /dev/null
crw-rw-rw- 1 root root 1, 3 Aug 1 14:12 /dev/null
$ docker exec -u test 0ad6d3064e9d ls
$ ls -l /dev/null
crw-rw-rw- 1 test root 1, 3 Aug 1 14:12 /dev/null
Signed-off-by: Jaroslav Jindrak <dzejrou@gmail.com>
First, check if strdup() fails and error out.
While we are there, the else case was missing brackets, as we only need
to check ret in the else case. Fix that too
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
configs package can no longer be built on non-Linux OS, such as Darwin.
When running `GOOS=darwin go build` on the packge, we had the following
errors:
```
./configs/mount.go:34:16: undefined: unix.MountAttr
./configs/mount.go:47:22: undefined: unix.MS_BIND
```
Let's ensure that the linux specific bits are handled in mount_linux.go,
and introduce a _unsupported file, similar to how cgroups file is
handled within the package. This'll facilitate utilization of the pkg
for other projects that care about Darwin.
Signed-off-by: Eric Ernst <eric_ernst@apple.com>
Rewrite systemdVersionAtoi to not use regexp, and fix two issues:
1. It was returning 0 (rather than -1) for some errors.
2. The comment was saying that the input string is without quotes,
while in fact it is.
Note the new function, similar to the old one, works on input either
with or without quotes. Amend the test to add test cases without quotes.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
I don't want to implement it now, because this might result in some
new issues, but this is definitely something that is worth implementing.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This test (initially added by commit 58ea21daef and later amended in
commit 26dc55ef1a) currently has two major deficiencies:
1. All possible flag combinations, and their respective numeric values,
have to be explicitly listed. Currently we support 3 flags, so
there is only 2^3 - 1 = 7 combinations, but adding more flags will
become increasingly difficult (for example, 5 flags will result in
31 combinations).
2. The test requires kernel 4.17 (for SECCOMP_FILTER_FLAG_SPEC_ALLOW),
and not doing any tests when running on an older kernel. This, too,
will make it more difficult to add extra flags in the future.
Both issues can be solved by using runc features which now prints all
known and supported runc flags. We still have to hardcode the numeric
values of all flags, but most of the other work is coded now.
In particular:
* The test only uses supported flags, meaning it can be used with
older kernels, removing the limitation (2) above.
* The test calculates the powerset (all possible combinations) of
flags and their numeric values. This makes it easier to add more
flags, removing the limitation (1) above.
* The test will fail (in flags_value) if any new flags will be added
to runc but the test itself is not amended.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
If no seccomps flags are set in OCI runtime spec (not even the empty
set), set SPEC_ALLOW as the default (if it's supported).
Otherwise, use the flags as they are set (that includes no flags for
empty seccomp.Flags array).
This mimics the crun behavior, and makes runc seccomp performance on par
with crun.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Amend runc features to print seccomp flags. Two set of flags are added:
* known flags are those that this version of runc is aware of;
* supported flags are those that can be set; normally, this is the same
set as known flags, but due to older version of kernel and/or
libseccomp, some known flags might be unsupported.
This commit also consolidates three different switch statements dealing
with flags into one, in func setFlag. A note is added to this function
telling what else to look for when adding new flags.
Unfortunately, it also adds a list of known flags, that should be
kept in sync with the switch statement.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Init State Error message was using the err variable instead of uerr, which has been fixed now.
The error message should not show "nil" now.
Signed-off-by: Vipul Newaskar <vipulnewaskar7@gmail.com>
This is aimed at solving the problem of cgroup v2 memory controller
behavior which is not compatible with that of cgroup v1.
In cgroup v1, if the new memory limit being set is lower than the
current usage, setting the new limit fails.
In cgroup v2, same operation succeeds, and the container is OOM killed.
Introduce a new setting, memory.checkBeforeUpdate, and use it to mimic
cgroup v1 behavior.
Note that this is not 100% reliable because of TOCTOU, but this is the
best we can do.
Add some test cases.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
In findLastSyscalls, we convert libseccomp.ArchNative to the real
libseccomp architecture, but archToNative already does that, so
this code is redundant.
Remove the redundant code, and move its comment to archToNative.
Fixes: 7a8d7162f
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This makes libseccomp produce a BPF which uses a binary tree for
syscalls (instead of linear set of if statements).
It does not make sense to enable binary tree for small set of rules,
so don't do that if we have less than 8 syscalls (the number is chosen
arbitrarily).
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Qiang Huang