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* rootless: add fallback for renameat2 at runtimeGiuseppe Scrivano2019-12-04
| | | | | | | | | | | | the renameat2 syscall might be defined in the C library but lacking support in the kernel. In such case, let it fallback to open(O_CREAT)+rename as it does on systems lacking the definition for renameat2. Closes: https://github.com/containers/libpod/issues/4570 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: provide workaround for missing renameat2Giuseppe Scrivano2019-11-06
| | | | | | | | | on RHEL 7.7 renameat2 is not implemented for s390x, provide a workaround. Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1768519 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: use SYS_renameat2 instead of __NR_renameat2Giuseppe Scrivano2019-11-06
| | | | | | use the correct definition for the syscall number. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: do not enable lingering modeGiuseppe Scrivano2019-10-17
| | | | | | | | do not automatically enable lingering mode. Closes: https://github.com/containers/libpod/issues/4224 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: drop dependency on dockerGiuseppe Scrivano2019-10-16
| | | | | | use the definition from "golang.org/x/sys/unix". Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* show uid_map in podman infoQi Wang2019-10-09
| | | | | | show uid_map gid_map in podman info Signed-off-by: Qi Wang <qiwan@redhat.com>
* rootless: automatically recreate the pause.pid fileGiuseppe Scrivano2019-10-09
| | | | | | | if the pause process cannot be joined, remove the pause.pid while keeping a lock on it, and try to recreate it. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: do not close files twiceGiuseppe Scrivano2019-10-09
| | | | Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Set log-level immediately, before rootless setupMatthew Heon2019-09-26
| | | | | | | | | | | | If we don't do this, we print WARN level messages that we should not be printing by default. Up one WARN message to ERROR so it still shows up by default. Fixes: #4115 Fixes: #4012 Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* pkg/util: use rootless function to read additional usersGiuseppe Scrivano2019-09-03
| | | | | | | make pkg/rootless.GetConfiguredMappings public so that it can be used from pkg/util. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: detect user namespace configuration changesGiuseppe Scrivano2019-09-03
| | | | | | | | | | | detect if the current user namespace doesn't match the configuration in the /etc/subuid and /etc/subgid files. If there is a mismatch, raise a warning and suggest the user to recreate the user namespace with "system migrate", that also restarts the containers. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Merge pull request #3782 from eriksjolund/fix_realloc_in_rootless_linux.cOpenShift Merge Robot2019-08-11
|\ | | | | Fix incorrect use of realloc()
| * Fix incorrect use of realloc()Erik Sjölund2019-08-11
| | | | | | | | Signed-off-by: Erik Sjölund <erik.sjolund@gmail.com>
* | Adjust read count so that a newline can be added afterwardsErik Sjölund2019-08-11
|/ | | | Signed-off-by: Erik Sjölund <erik.sjolund@gmail.com>
* Fix a couple of errors descovered by coverityDaniel J Walsh2019-08-09
| | | | Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* golangci-lint round #3baude2019-07-21
| | | | | | | this is the third round of preparing to use the golangci-lint on our code base. Signed-off-by: baude <bbaude@redhat.com>
* golangci-lint pass number 2baude2019-07-11
| | | | | | clean up and prepare to migrate to the golangci-linter Signed-off-by: baude <bbaude@redhat.com>
* first pass of corrections for golangci-lintbaude2019-07-10
| | | | Signed-off-by: baude <bbaude@redhat.com>
* trivial cleanups from golangbaude2019-07-03
| | | | | | the results of a code cleanup performed by the goland IDE. Signed-off-by: baude <bbaude@redhat.com>
* rootless: allow to build without cgoGiuseppe Scrivano2019-07-02
| | | | | | | unfortunately rootless won't work without cgo, as most of the implementation is in C, but at least allow to build libpod. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: do not join namespace if it has already euid == 0Giuseppe Scrivano2019-07-01
| | | | | | | | | do not attempt to join the rootless namespace if it is running already with euid == 0. Closes: https://github.com/containers/libpod/issues/3463 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Merge pull request #3397 from giuseppe/fix-rebootOpenShift Merge Robot2019-06-28
|\ | | | | rootless: enable linger if /run/user/UID not exists
| * rootless: enable linger if /run/user/UID not existsGiuseppe Scrivano2019-06-27
| | | | | | | | | | | | | | | | | | | | | | | | | | at least on Fedora 30 it creates the /run/user/UID directory for the user logged in via ssh. This needs to be done very early so that every other check when we create the default configuration file will point to the correct location. Closes: https://github.com/containers/libpod/issues/3410 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* | Exclude SIGTERM from blocked signals for pause process.Danila Kiver2019-06-28
|/ | | | | | | | | | | | Currently pause process blocks all signals which may cause its termination, including SIGTERM. This behavior hangs init(1) during system shutdown, until pause process gets SIGKILLed after some grace period. To avoid this hanging, SIGTERM is excluded from list of blocked signals. Fixes #3440 Signed-off-by: Danila Kiver <danila.kiver@mail.ru>
* Build cgo files with -Wall -WerrorSascha Grunert2019-06-21
| | | | | | | | To avoid unnecessary warnings and errors in the future I'd like to propose building all cgo related sources with `-Wall -Werror`. This commit fixes some warnings which came up in `shm_lock.c`, too. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
* Merge pull request #3379 from openSUSE/rootless-fixOpenShift Merge Robot2019-06-21
|\ | | | | Fix format specifiers in rootless_linux.c
| * Fix format specifiers in rootless_linux.cSascha Grunert2019-06-20
| | | | | | | | | | | | | | Format `%d` expects argument of type `int`, but the argument has a type of `long int`. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
* | Merge pull request #3380 from openSUSE/asprintf-fixOpenShift Merge Robot2019-06-20
|\ \ | | | | | | Handle possible asprintf failure in rootless_linux.c
| * | Handle possible asprintf failure in rootless_linux.cSascha Grunert2019-06-20
| |/ | | | | | | | | | | If `asprintf` fails we early exit now. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
* / Fix execvp uage in rootless_linux.cSascha Grunert2019-06-20
|/ | | | | | | The second argument of `execlp` should be of type `char *`, so we need to add an additional argument there. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
* Fix cgo includes for muslCameron Nemo2019-06-08
| | | | | | closes #3284 Signed-off-by: Cameron Nemo <cnemo@tutanota.com>
* rootless: skip NS_GET_PARENT on old kernelsGiuseppe Scrivano2019-06-06
| | | | | | | | | | | | on old kernels the ioctl NS_GET_PARENT is not available. Handle the error code and immediately return the same fd. It should be fine now that we use the namespace resolution using the conmon pid, so the namespace parent resolution is just a safety measure. Closes: https://github.com/containers/libpod/issues/2968 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: block signals on re-execGiuseppe Scrivano2019-06-03
| | | | | | | | | | | | | we are allowed to use only signal safe functions between a fork of a multithreaded application and the next execve. Since setenv(3) is not signal safe, block signals. We are already doing it for creating a new namespace. This is mostly a cleanup since reexec_in_user_namespace_wait is used only only to join existing namespaces when we have not a pause.pid file. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: use TEMP_FAILURE_RETRY macroGiuseppe Scrivano2019-05-31
| | | | | | avoid checking for EINTR for every syscall that could block. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: fix return typeGiuseppe Scrivano2019-05-31
| | | | Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: make sure the buffer is NUL terminatedGiuseppe Scrivano2019-05-31
| | | | | | | after we read from the pause PID file, NUL terminate the buffer to avoid reading garbage from the stack. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: make JoinUserAndMountNS privateGiuseppe Scrivano2019-05-25
| | | | | | as it is used only by the rootless package now. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: enable loginctl lingerGiuseppe Scrivano2019-05-25
| | | | | | | otherwise the processes we leave around will be killed once the session terminates. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: new function to join existing conmon processesGiuseppe Scrivano2019-05-25
| | | | | | | | | | | | | | | move the logic for joining existing namespaces down to the rootless package. In main_local we still retrieve the list of conmon pid files and use it from the rootless package. In addition, create a temporary user namespace for reading these files, as the unprivileged user might not have enough privileges for reading the conmon pid file, for example when running with a different uidmap and root in the container is different than the rootless user. Closes: https://github.com/containers/libpod/issues/3187 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: block signals for pauseGiuseppe Scrivano2019-05-25
| | | | | | | block signals for the pause process, so it can't be killed by mistake. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: store also the original GID in the hostGiuseppe Scrivano2019-05-23
| | | | Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: join namespace immediately when possibleGiuseppe Scrivano2019-05-17
| | | | | | | | | | | add a shortcut for joining immediately the namespace so we don't need to re-exec Podman. With the pause process simplificaton, we can now attempt to join the namespaces as soon as Podman starts (and before the Go runtime kicks in), so that we don't need to re-exec and use just one process. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: use a pause processGiuseppe Scrivano2019-05-17
| | | | | | | | | | | | | | | | | use a pause process to keep the user and mount namespace alive. The pause process is created immediately on reload, and all successive Podman processes will refer to it for joining the user&mount namespace. This solves all the race conditions we had on joining the correct namespaces using the conmon processes. As a fallback if the join fails for any reason (e.g. the pause process was killed), then we try to join the running containers as we were doing before. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: not close more FDs than neededGiuseppe Scrivano2019-04-18
| | | | | | | | | | | | we were previously closing as many FDs as they were open when we first started Podman in the range (3-MAX-FD). This would cause issues if there were empty intervals, as these FDs are later on used by the Golang runtime. Store exactly what FDs were first open in a fd_set, so that we can close exactly the FDs that were open at startup. Closes: https://github.com/containers/libpod/issues/2964 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Revert "rootless: set controlling terminal for podman in the userns"Giuseppe Scrivano2019-04-14
| | | | | | | | This reverts commit 531514e8231e7f42efb7e7992d62e516f9577363. Closes: https://github.com/containers/libpod/issues/2926 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: do not block SIGTSTPGiuseppe Scrivano2019-04-12
| | | | | | | | | we were previously proxying all the signals, but doing that for SIGTSTP prevented the main process to be stopped by the tty. Closes: https://github.com/containers/libpod/issues/2775 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: set controlling terminal for podman in the usernsGiuseppe Scrivano2019-04-12
| | | | Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: use a single user namespaceGiuseppe Scrivano2019-04-01
| | | | | | | | | | | | | | | | | | | | | simplify the rootless implementation to use a single user namespace for all the running containers. This makes the rootless implementation behave more like root Podman, where each container is created in the host environment. There are multiple advantages to it: 1) much simpler implementation as there is only one namespace to join. 2) we can join namespaces owned by different containers. 3) commands like ps won't be limited to what container they can access as previously we either had access to the storage from a new namespace or access to /proc when running from the host. 4) rootless varlink works. 5) there are only two ways to enter in a namespace, either by creating a new one if no containers are running or joining the existing one from any container. Containers created by older Podman versions must be restarted. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: remove SkipStorageSetup()Giuseppe Scrivano2019-04-01
| | | | | | | | in the few places where we care about skipping the storage initialization, we can simply use the process effective UID, instead of relying on a global boolean flag. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: change env prefixGiuseppe Scrivano2019-03-28
| | | | | | | | | | from _LIBPOD to _CONTAINERS. The same change was done in buildah unshare. This is necessary for podman to detect we are running in a rootless environment and work properly from a "buildah unshare" session. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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