When running runc tests with temp directory with size 500M copying
busybox without preserving hardlinks causes the folder to inflate to
roughly 330M. Copying busybox twice in certain tests causes the /tmp
directory to overfill. Using `-a` preserves links which busybox uses to
implement its choice of binary to run.
Signed-off-by: Tom Godkin <tgodkin@pivotal.io>
runc shouldn't depend on docker and be more self-contained.
Removing github.com/pkg/symlink dep is the first step to not depend on docker anymore
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Previously we would handle the "unmapped stdio" case by just doing a
simple check, however this didn't handle cases where the overflow_uid
was actually mapped in the user namespace. Instead of doing some
userspace checks, just try to do the fchown(2) and ignore EINVAL
(unmapped) or EPERM (lacking privilege over inode) errors.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Multiple conditions were previously allowed to be placed upon the
same syscall argument. Restore this behavior.
Signed-off-by: Matthew Heon <mheon@redhat.com>
This fixes a GetStats() issue introduced in #1590:
If Intel RDT is enabled by hardware and kernel, but intelRdt is not
specified in original config, GetStats() will return error unexpectedly
because we haven't called Apply() to create intelrdt group or attach
tasks for this container. As a result, runc events command will have no
output.
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
The Major and Minor functions were added for Linux in golang/sys@85d1495
which is already vendored in. Use these functions instead of the local
re-implementation.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
This allows runc to be used as a target for docker's reexec module that
depends on a correct argv0 to select which process entrypoint to invoke.
Without this patch, when runc re-execs argv0 is set to "/proc/self/exe"
and the reexec module doesn't know what to do with it.
Signed-off-by: Petros Angelatos <petrosagg@gmail.com>
There are essentially two possible implementations for Setuid/Setgid on
Linux, either using SYS_SETUID32/SYS_SETGID32 or SYS_SETUID/SYS_SETGID,
depending on the architecture (see golang/go#1435 for why Setuid/Setgid
aren currently implemented for Linux neither in syscall nor in
golang.org/x/sys/unix).
Reduce duplication by merging the currently implemented variants and
adjusting the build tags accordingly.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
This commit ensures we write the expected freezer cgroup state after
every state check, in case the state check does not give the expected
result. This can happen when a new task is created and prevents the
whole cgroup to be FROZEN, leaving the state into FREEZING instead.
This patch prevents the case of an infinite loop to happen.
Fixes https://github.com/opencontainers/runc/issues/1609
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Both Process.Kill() and Process.Wait() can return errors that don't impact the correct behaviour of terminate.
Instead of letting these get returned and logged, which causes confusion, silently ignore them.
Currently the test needs to be a string test as the errors are private to the runtime packages, so its our only option.
This can be seen if init fails during the setns.
Signed-off-by: Steven Hartland <steven.hartland@multiplay.co.uk>
Due to the semantics of chroot(2) when it comes to mount namespaces, it
is not generally safe to use MS_PRIVATE as a mount propgation when using
chroot(2). The reason for this is that this effectively results in a set
of mount references being held by the chroot'd namespace which the
namespace cannot free. pivot_root(2) does not have this issue because
the @old_root can be unmounted by the process.
Ultimately, --no-pivot is not really necessary anymore as a commonly
used option since f8e6b5af5e ("rootfs: make pivot_root not use a
temporary directory") resolved the read-only issue. But if someone
really needs to use it, MS_PRIVATE is never a good idea.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Signed-off-by: Ed King <eking@pivotal.io>
Signed-off-by: Gabriel Rosenhouse <grosenhouse@pivotal.io>
Signed-off-by: Konstantinos Karampogias <konstantinos.karampogias@swisscom.com>
The benefit for doing this within runc is that it works well with
userns.
Actually, runc already does the same thing for mount points.
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
Signed-off-by: Will Martin <wmartin@pivotal.io>
Signed-off-by: Petar Petrov <pppepito86@gmail.com>
Signed-off-by: Ed King <eking@pivotal.io>
Signed-off-by: Roberto Jimenez Sanchez <jszroberto@gmail.com>
Signed-off-by: Thomas Godkin <tgodkin@pivotal.io>
The code in prepareRoot (e385f67a0e/libcontainer/rootfs_linux.go (L599-L605))
attempts to default the rootfs mount to `rslave`. However, since the spec
conversion has already defaulted it to `rprivate`, that code doesn't
actually ever do anything.
This changes the spec conversion code to accept "" and treat it as 0.
Implicitly, this makes rootfs propagation default to `rslave`, which is
a part of fixing the moby bug https://github.com/moby/moby/issues/34672
Alternate implementatoins include changing this defaulting to be
`rslave` and removing the defaulting code in prepareRoot, or skipping
the mapping entirely for "", but I think this change is the cleanest of
those options.
Signed-off-by: Euan Kemp <euan.kemp@coreos.com>
In current implementation:
Either Intel RDT is not enabled by hardware and kernel, or intelRdt is
not specified in original config, we don't init IntelRdtManager in the
container to handle intelrdt constraint. It is a tradeoff that Intel RDT
has hardware limitation to support only limited number of groups.
This patch makes a minor change to support update command:
Whether or not intelRdt is specified in config, we always init
IntelRdtManager in the container if Intel RDT is enabled. If intelRdt is
not specified in original config, we just don't Apply() to create
intelrdt group or attach tasks for this container.
In update command, we could re-enable through IntelRdtManager.Apply()
and then update intelrdt constraint.
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
This fix tries to address the warnings caused by static build
with go 1.9. As systemd needs dlopen/dlclose, the following warnings
will be generated for static build in go 1.9:
```
root@f4b077232050:/go/src/github.com/opencontainers/runc# make static
CGO_ENABLED=1 go build -tags "seccomp cgo static_build" -ldflags "-w -extldflags -static -X main.gitCommit="1c81e2a794c6e26a4c650142ae8893c47f619764" -X main.version=1.0.0-rc4+dev " -o runc .
/tmp/go-link-113476657/000007.o: In function `_cgo_a5acef59ed3f_Cfunc_dlopen':
/tmp/go-build/github.com/opencontainers/runc/vendor/github.com/coreos/pkg/dlopen/_obj/cgo-gcc-prolog:76: warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
```
This fix disables systemd when `static_build` flag is on (apply_nosystemd.go
is used instead).
This fix also fixes a small bug in `apply_nosystemd.go` for return value.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Now that rootless containers have support for multiple uid and gid
mappings, allow --user to work as expected. If the user is not mapped,
an error occurs (as usual).
Signed-off-by: Aleksa Sarai <asarai@suse.de>
With the addition of our new{uid,gid}map support, we used to call
execvp(3) from inside nsexec. This would mean that the path resolution
for the binaries would happen in nsexec. Move the resolution to the
initial setup code, and pass the absolute path to nsexec.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
After quite a bit of debugging, I found that previous versions of this
patchset did not include newgidmap in a rootless setting. Fix this by
passing it whenever group mappings are applied, and also providing some
better checking for try_mapping_tool. This commit also includes some
stylistic improvements.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Seth Jennings
Vincent Demeester
Michael Crosby
Akihiro Suda
Danail Branekov
Lorenzo Fontana
Mrunal Patel
Aleksa Sarai
Qiang Huang
Matthew Heon
Xiaochen Shen
Tobias Klauser
Petros Angelatos
Sebastien Boeuf
Steven Hartland
Will Martin
Konstantinos Karampogias
Daniel, Dao Quang Minh
Euan Kemp
s7v7nislands
Yong Tang