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* rootless: move join namespace inside child processGiuseppe Scrivano2020-04-20
| | | | | | | | open the namespace file descriptors inside of the child process. Closes: https://github.com/containers/libpod/issues/5873 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: skip looking up parent user nsGiuseppe Scrivano2020-04-20
| | | | | | | | since we join directly the conmon user namespace, there is no need to look up its parent user namespace, as we can safely assume it is the init namespace. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: use snprintfGiuseppe Scrivano2020-04-13
| | | | | | use directly snprintf instead of strlen+strcpy. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: fix usage with hidepid=1Giuseppe Scrivano2020-03-19
| | | | | | | | | | | when /proc is mounted with hidepid=1 a process doesn't see processes from the outer user namespace. This causes an issue reading the cmdline from the parent process. To address it, always read the command line from /proc/self instead of using /proc/PARENT_PID. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Merge pull request #5324 from giuseppe/fix-running-no-pauseOpenShift Merge Robot2020-02-25
|\ | | | | rootless: raise error if the process is not found
| * rootless: become root only if the pause file is specifiedGiuseppe Scrivano2020-02-25
| | | | | | | | | | | | | | | | | | | | | | | | we need to store the pause process PID file so that it can be re-used later. commit e9dc2120925d9bc32b87ed3c4122aa40f7413db5 introduced this regression. Closes: https://github.com/containers/libpod/issues/5246 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* | rootless: fix segfault when open fd >= FD_SETSIZEGiuseppe Scrivano2020-02-25
|/ | | | | | | | | if there are more than FD_SETSIZE open fds passed down to the Podman process, the initialization code could crash as it attempts to store them into a fd_set. Use an array of fd_set structs, each of them holding only FD_SETSIZE file descriptors. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: check if the conmon process is validGiuseppe Scrivano2020-02-17
| | | | | | | | if the pause process doesn't exist and we try to join a conmon namespace, make sure the process still exists. Otherwise re-create the user namespace. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: enable shortcut only for podmanGiuseppe Scrivano2020-01-29
| | | | | | | disable joining automatically the user namespace if the process is not podman. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: set C variables also on shortcutGiuseppe Scrivano2020-01-20
| | | | | | | | | make sure the rootless env variables are set also when we are joining directly the user+mount namespace without creating a new process. It is required by pkg/unshare in containers/common. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* fix lint in pkg/rootlessValentin Rothberg2020-01-08
| | | | Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
* 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>
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