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path: root/pkg/rootless/rootless_linux.c
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* podman image scp never enter podman user NScdoern2021-12-23
| | | | | | | | | | | Podman image scp should never enter the Podman UserNS unless it needs to. This allows for a sudo exec.Command to transfer images to and from rootful storage. If this command is run using sudo, the simple sudo podman save/load does not work, machinectl/su is necessary here. This modification allows for both rootful and rootless transfers, and an overall change of scp to be more of a wrapper function for different load and save calls as well as the ssh component Signed-off-by: cdoern <cdoern@redhat.com>
* [NO NEW TESTS NEEDED] rootless: declare TEMP_FAILURE_RETRY before usage ↵Marc Nguyen2021-12-10
| | | | | | (Fixes: #12563) Signed-off-by: Nguyen Marc <nguyen_marc@live.fr>
* Merge pull request #12325 from giuseppe/rootless-use-auto-cleanupOpenShift Merge Robot2021-11-17
|\ | | | | rootless: use auto cleanup functions
| * rootless: drop strerror(errno) callsGiuseppe Scrivano2021-11-17
| | | | | | | | | | | | *printf functions already support printing the errno string with %m Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
| * rootless: reuse existing open_namespace functionGiuseppe Scrivano2021-11-17
| | | | | | | | | | | | there is already a function for opening a namespace path, reuse it. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
| * rootless: use auto cleanup functionsGiuseppe Scrivano2021-11-17
| | | | | | | | | | | | | | | | simplify code using auto cleanup functions [NO NEW TESTS NEEDED] it is a refactoring of existing code Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* | rootless: use catatonit to maintain user+mnt namespaceGiuseppe Scrivano2021-11-17
|/ | | | | | | | | if catatonit is present, use it to keep the rootless user+mnt namespace alive. [NO NEW TESTS NEEDED] no new features added. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* podman machine: do not join usernsPaul Holzinger2021-09-27
| | | | | | | | | | | The go logic already prevents podman from joining the userns for machine commands but the c shortcut code did not. [NO TESTS NEEDED] Fixes #11731 Signed-off-by: Paul Holzinger <pholzing@redhat.com>
* rootless: avoid zombie process on first launchGiuseppe Scrivano2021-07-29
| | | | | | | | | | | | | | avoid a zombie process if on the first launch Podman creates a long living process, such as "podman system service -t 0". The `r` variable was overriden thus causing the waitpid to fail and not clean up the intermediate process. Closes: https://github.com/containers/podman/issues/10575 [NO TESTS NEEDED] Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: fix fast join userns pathGiuseppe Scrivano2021-06-09
| | | | | | | | | | | | | | commit ab886328357184cd0a8375a5dedf816ba91789f9 changed the path for the pause.pid file but didn't update the same path in the C code. This prevented Podman to take the fast path when the userns is already created and to join it without re-execing itself. Fix the path in the C code as well so we can join the rootless user+mount namespace without having to re-exec Podman. [NO TESTS NEEDED] Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: fix SIGSEGV ,make LISTEN_FDNAMES optional [Closes #10435].flouthoc2021-05-29
| | | | | | [NO TESTS NEEDED] Signed-off-by: flouthoc <flouthoc.git@gmail.com>
* Move socket activation check into init() and set global condition.pendulm2021-04-05
| | | | | | | | | So rootless setup could use this condition in parent and child, child podman should adjust LISTEN_PID to its self PID. Add system test for systemd socket activation Signed-off-by: pendulm <lonependulm@gmail.com>
* rootless: use is_fd_inheritedGiuseppe Scrivano2021-03-29
| | | | | | | since we already have an exported function that does the check, refactor the code to use it instead of duplicating the logic. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Log working dir when chdir failsJonas Schievink2021-02-19
| | | | Signed-off-by: Jonas Schievink <jonasschievink@gmail.com>
* leak fix in rootless_linux.c fcn can_use_shortcutJakub Guzik2021-02-19
| | | | Signed-off-by: Jakub Guzik <jakubmguzik@gmail.com>
* validate fds --preserve-fdsQi Wang2020-08-04
| | | | | | validate file descriptors passed from podman run and podman exec --preserve-fds. Signed-off-by: Qi Wang <qiwan@redhat.com>
* rootless: system service joins immediately the namespacesGiuseppe Scrivano2020-08-03
| | | | | | | | | | when there is a pause process running, let the "system service" podman instance join immediately the existing namespaces. Closes: https://github.com/containers/podman/issues/7180 Closes: https://github.com/containers/podman/issues/6660 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* rootless: child exits immediately on userns errorsGiuseppe Scrivano2020-07-30
| | | | | | | if the parent process failed to create the user namespace, let the child exit immediately. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Add podman image mountDaniel J Walsh2020-07-28
| | | | | | | | | | | | | There are many use cases where you want to just mount an image without creating a container on it. For example you might want to just examine the content in an image after you pull it for security analysys. Or you might want to just use the executables on the image without running it in a container. The image is mounted readonly since we do not want people changing images. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* Cleanup handling of podman mount/unmountDaniel J Walsh2020-07-27
| | | | | | | | | | | We should default to the user name unmount rather then the internal name of umount. Also User namespace was not being handled correctly. We want to inform the user that if they do a mount when in rootless mode that they have to be first in the podman unshare state. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* rootless: move ns open before forkGiuseppe Scrivano2020-04-29
| | | | | | | | | | commit 788fdc685b00dee5ccb594bef845204250c4c123 introduced a race where the target process dies before the child process opens the namespace files. Move the open before the fork so if it fails the parent process can attempt to join a different container instead of failing. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* 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: 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>
* 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: 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>
* 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>
* 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>
* 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>
* 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>
* 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>
* 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: 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>
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