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path: root/runsc/boot/fs.go
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2019-10-16Fix problem with open FD when copy up is triggered in overlayfsFabricio Voznika
Linux kernel before 4.19 doesn't implement a feature that updates open FD after a file is open for write (and is copied to the upper layer). Already open FD will continue to read the old file content until they are reopened. This is especially problematic for gVisor because it caches open files. Flag was added to force readonly files to be reopenned when the same file is open for write. This is only needed if using kernels prior to 4.19. Closes #1006 It's difficult to really test this because we never run on tests on older kernels. I'm adding a test in GKE which uses kernels with the overlayfs problem for 1.14 and lower. PiperOrigin-RevId: 275115289
2019-10-08Ignore mount options that are not supported in shared mountsFabricio Voznika
Options that do not change mount behavior inside the Sentry are irrelevant and should not be used when looking for possible incompatibilities between master and slave mounts. PiperOrigin-RevId: 273593486
2019-08-27Mount volumes as super userFabricio Voznika
This used to be the case, but regressed after a recent change. Also made a few fixes around it and clean up the code a bit. Closes #720 PiperOrigin-RevId: 265717496
2019-08-02Stops container if gofer is killedFabricio Voznika
Each gofer now has a goroutine that polls on the FDs used to communicate with the sandbox. The respective gofer is destroyed if any of the FDs is closed. Closes #601 PiperOrigin-RevId: 261383725
2019-08-02Remove kernel.mounts.Nicolas Lacasse
We can get the mount namespace from the CreateProcessArgs in all cases where we need it. This also gets rid of kernel.Destroy method, since the only thing it was doing was DecRefing the mounts. Removing the need to call kernel.SetRootMountNamespace also allowed for some more simplifications in the container fs setup code. PiperOrigin-RevId: 261357060
2019-07-26Merge pull request #452 from zhangningdlut:chris_test_pidnsgVisor bot
PiperOrigin-RevId: 260220279
2019-07-25Automated rollback of changelist 255679453Fabricio Voznika
PiperOrigin-RevId: 260047477
2019-07-24Use different pidns among different containerschris.zn
The different containers in a sandbox used only one pid namespace before. This results in that a container can see the processes in another container in the same sandbox. This patch use different pid namespace for different containers. Signed-off-by: chris.zn <chris.zn@antfin.com>
2019-07-23Give each container a distinct MountNamespace.Nicolas Lacasse
This keeps all container filesystem completely separate from eachother (including from the root container filesystem), and allows us to get rid of the "__runsc_containers__" directory. It also simplifies container startup/teardown as we don't have to muck around in the root container's filesystem. PiperOrigin-RevId: 259613346
2019-07-12Take a reference on the already-mounted inode before re-mounting it.Nicolas Lacasse
PiperOrigin-RevId: 257855777
2019-07-02Remove map from fd_map, change to fd_table.Adin Scannell
This renames FDMap to FDTable and drops the kernel.FD type, which had an entire package to itself and didn't serve much use (it was freely cast between types, and served as more of an annoyance than providing any protection.) Based on BenchmarkFDLookupAndDecRef-12, we can expect 5-10 ns per lookup operation, and 10-15 ns per concurrent lookup operation of savings. This also fixes two tangential usage issues with the FDMap. Namely, non-atomic use of NewFDFrom and associated calls to Remove (that are both racy and fail to drop the reference on the underlying file.) PiperOrigin-RevId: 256285890
2019-06-28Automated rollback of changelist 255263686Nicolas Lacasse
PiperOrigin-RevId: 255679453
2019-06-27Cache directory entries in the overlayMichael Pratt
Currently, the overlay dirCache is only used for a single logical use of getdents. i.e., it is discard when the FD is closed or seeked back to the beginning. But the initial work of getting the directory contents can be quite expensive (particularly sorting large directories), so we should keep it as long as possible. This is very similar to the readdirCache in fs/gofer. Since the upper filesystem does not have to allow caching readdir entries, the new CacheReaddir MountSourceOperations method controls this behavior. This caching should be trivially movable to all Inodes if desired, though that adds an additional copy step for non-overlay Inodes. (Overlay Inodes already do the extra copy). PiperOrigin-RevId: 255477592
2019-06-26Preserve permissions when checking lowerFabricio Voznika
The code was wrongly assuming that only read access was required from the lower overlay when checking for permissions. This allowed non-writable files to be writable in the overlay. Fixes #316 PiperOrigin-RevId: 255263686
2019-06-13Plumb context through more layers of filesytem.Ian Gudger
All functions which allocate objects containing AtomicRefCounts will soon need a context. PiperOrigin-RevId: 253147709
2019-06-13Update canonical repository.Adin Scannell
This can be merged after: https://github.com/google/gvisor-website/pull/77 or https://github.com/google/gvisor-website/pull/78 PiperOrigin-RevId: 253132620
2019-06-11Add support to mount pod shared tmpfs mountsFabricio Voznika
Parse annotations containing 'gvisor.dev/spec/mount' that gives hints about how mounts are shared between containers inside a pod. This information can be used to better inform how to mount these volumes inside gVisor. For example, a volume that is shared between containers inside a pod can be bind mounted inside the sandbox, instead of being two independent mounts. For now, this information is used to allow the same tmpfs mounts to be shared between containers which wasn't possible before. PiperOrigin-RevId: 252704037
2019-06-03Refactor container FS setupFabricio Voznika
No change in functionaly. Added containerMounter object to keep state while the mounts are processed. This will help upcoming changes to share mounts per-pod. PiperOrigin-RevId: 251350096
2019-05-23Set sticky bit to /tmpFabricio Voznika
This is generally done for '/tmp' to prevent accidental deletion of files. More details here: http://man7.org/linux/man-pages/man1/chmod.1.html#RESTRICTED_DELETION_FLAG_OR_STICKY_BIT PiperOrigin-RevId: 249633207 Change-Id: I444a5b406fdef664f5677b2f20f374972613a02b
2019-05-23Initial support for bind mountsFabricio Voznika
Separate MountSource from Mount. This is needed to allow mounts to be shared by multiple containers within the same pod. PiperOrigin-RevId: 249617810 Change-Id: Id2944feb7e4194951f355cbe6d4944ae3c02e468
2019-05-03Fix runsc restore to be compatible with docker start --checkpoint ...Andrei Vagin
Change-Id: I02b30de13f1393df66edf8829fedbf32405d18f8 PiperOrigin-RevId: 246621192
2019-04-29Change copyright notice to "The gVisor Authors"Michael Pratt
Based on the guidelines at https://opensource.google.com/docs/releasing/authors/. 1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./' 2. Manual fixup of "Google Inc" references. 3. Add AUTHORS file. Authors may request to be added to this file. 4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS. Fixes #209 PiperOrigin-RevId: 245823212 Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
2019-04-29Allow and document bug ids in gVisor codebase.Nicolas Lacasse
PiperOrigin-RevId: 245818639 Change-Id: I03703ef0fb9b6675955637b9fe2776204c545789
2019-04-17Use FD limit and file size limit from hostFabricio Voznika
FD limit and file size limit is read from the host, instead of using hard-coded defaults, given that they effect the sandbox process. Also limit the direct cache to use no more than half if the available FDs. PiperOrigin-RevId: 244050323 Change-Id: I787ad0fdf07c49d589e51aebfeae477324fe26e6
2019-04-04gvisor: Add support for the MS_NOEXEC mount optionAndrei Vagin
https://github.com/google/gvisor/issues/145 PiperOrigin-RevId: 242044115 Change-Id: I8f140fe05e32ecd438b6be218e224e4b7fe05878
2019-03-13Allow filesystem.Mount to take an optional interface argument.Nicolas Lacasse
PiperOrigin-RevId: 238360231 Change-Id: I5eaf8d26f8892f77d71c7fbd6c5225ef471cedf1
2019-02-01Factor the subtargets method into a helper method with tests.Nicolas Lacasse
PiperOrigin-RevId: 232047515 Change-Id: I00f036816e320356219be7b2f2e6d5fe57583a60
2019-01-18Scrub runsc error messagesFabricio Voznika
Removed "error" and "failed to" prefix that don't add value from messages. Adjusted a few other messages. In particular, when the container fail to start, the message returned is easier for humans to read: $ docker run --rm --runtime=runsc alpine foobar docker: Error response from daemon: OCI runtime start failed: <path> did not terminate sucessfully: starting container: starting root container [foobar]: starting sandbox: searching for executable "foobar", cwd: "/", $PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin": no such file or directory Closes #77 PiperOrigin-RevId: 230022798 Change-Id: I83339017c70dae09e4f9f8e0ea2e554c4d5d5cd1
2019-01-16Prevent internal tmpfs mount to override files in /tmpFabricio Voznika
Runsc wants to mount /tmp using internal tmpfs implementation for performance. However, it risks hiding files that may exist under /tmp in case it's present in the container. Now, it only mounts over /tmp iff: - /tmp was not explicitly asked to be mounted - /tmp is empty If any of this is not true, then /tmp maps to the container's image /tmp. Note: checkpoint doesn't have sentry FS mounted to check if /tmp is empty. It simply looks for explicit mounts right now. PiperOrigin-RevId: 229607856 Change-Id: I10b6dae7ac157ef578efc4dfceb089f3b94cde06
2019-01-14Remove fs.Handle, ramfs.Entry, and all the DeprecatedFileOperations.Nicolas Lacasse
More helper structs have been added to the fsutil package to make it easier to implement fs.InodeOperations and fs.FileOperations. PiperOrigin-RevId: 229305982 Change-Id: Ib6f8d3862f4216745116857913dbfa351530223b
2018-12-04Max link traversals should be for an entire path.Brian Geffon
The number of symbolic links that are allowed to be followed are for a full path and not just a chain of symbolic links. PiperOrigin-RevId: 224047321 Change-Id: I5e3c4caf66a93c17eeddcc7f046d1e8bb9434a40
2018-11-20Don't fail when destroyContainerFS is called more than onceFabricio Voznika
This can happen when destroy is called multiple times or when destroy failed previously and is being called again. PiperOrigin-RevId: 221882034 Change-Id: I8d069af19cf66c4e2419bdf0d4b789c5def8d19e
2018-11-07AsyncBarrier should be run after all defers in destroyContainerFS.Nicolas Lacasse
destroyContainerFS must wait for all async operations to finish before returning. In an attempt to do this, we call fs.AsyncBarrier() at the end of the function. However, there are many defer'd DecRefs which end up running AFTER the AsyncBarrier() call. This CL fixes this by calling fs.AsyncBarrier() in the first defer statement, thus ensuring that it runs at the end of the function, after all other defers. PiperOrigin-RevId: 220523545 Change-Id: I5e96ee9ea6d86eeab788ff964484c50ef7f64a2f
2018-10-19Use correct company name in copyright headerIan Gudger
PiperOrigin-RevId: 217951017 Change-Id: Ie08bf6987f98467d07457bcf35b5f1ff6e43c035
2018-10-18Resolve mount paths while setting up root fs mountFabricio Voznika
It's hard to resolve symlinks inside the sandbox because rootfs and mounts may be read-only, forcing us to create mount points inside lower layer of an overlay, **before** the volumes are mounted. Since the destination must already be resolved outside the sandbox when creating mounts, take this opportunity to rewrite the spec with paths resolved. "runsc boot" will use the "resolved" spec to load mounts. In addition, symlink traversals were disabled while mounting containers inside the sandbox. It haven't been able to write a good test for it. So I'm relying on manual tests for now. PiperOrigin-RevId: 217749904 Change-Id: I7ac434d5befd230db1488446cda03300cc0751a9
2018-10-01Make multi-container the default mode for runscFabricio Voznika
And remove multicontainer option. PiperOrigin-RevId: 215236981 Change-Id: I9fd1d963d987e421e63d5817f91a25c819ced6cb
2018-09-28Make runsc kill and delete more conformant to the "spec"Fabricio Voznika
PiperOrigin-RevId: 214976251 Change-Id: I631348c3886f41f63d0e77e7c4f21b3ede2ab521
2018-09-24runsc: All non-root bind mounts should be shared.Nicolas Lacasse
This CL changes the semantics of the "--file-access" flag so that it only affects the root filesystem. The default remains "exclusive" which is the common use case, as neither Docker nor K8s supports sharing the root. Keeping the root fs as "exclusive" means that the fs-intensive work done during application startup will mostly be cacheable, and thus faster. Non-root bind mounts will always be shared. This CL also removes some redundant FSAccessType validations. We validate this flag in main(), so we can assume it is valid afterwards. PiperOrigin-RevId: 214359936 Change-Id: I7e75d7bf52dbd7fa834d0aacd4034868314f3b51
2018-09-19runsc: Fix stdin/stdout/stderr in multi-container mode.Kevin Krakauer
The issue with the previous change was that the stdin/stdout/stderr passed to the sentry were dup'd by host.ImportFile. This left a dangling FD that by never closing caused containerd to timeout waiting on container stop. PiperOrigin-RevId: 213753032 Change-Id: Ia5e4c0565c42c8610d3b59f65599a5643b0901e4
2018-09-19Add container.Destroy urpc method.Nicolas Lacasse
This method will: 1. Stop the container process if it is still running. 2. Unmount all sanadbox-internal mounts for the container. 3. Delete the contaner root directory inside the sandbox. Destroy is idempotent, and safe to call concurrantly. This fixes a bug where after stopping a container, we cannot unmount the container root directory on the host. This bug occured because the sandbox dirent cache was holding a dirent with a host fd corresponding to a file inside the container root on the host. The dirent cache did not know that the container had exited, and kept the FD open, preventing us from unmounting on the host. Now that we unmount (and flush) all container mounts inside the sandbox, any host FDs donated by the gofer will be closed, and we can unmount the container root on the host. PiperOrigin-RevId: 213737693 Change-Id: I28c0ff4cd19a08014cdd72fec5154497e92aacc9
2018-09-19Fix sandbox and gofer capabilitiesFabricio Voznika
Capabilities.Set() adds capabilities, but doesn't remove existing ones that might have been loaded. Fixed the code and added tests. PiperOrigin-RevId: 213726369 Change-Id: Id7fa6fce53abf26c29b13b9157bb4c6616986fba
2018-09-19runsc: Don't create __runsc_containers__ unless we are in multi-container mode.Nicolas Lacasse
PiperOrigin-RevId: 213715511 Change-Id: I3e41b583c6138edbdeba036dfb9df4864134fc12
2018-09-18Automated rollback of changelist 213307171Kevin Krakauer
PiperOrigin-RevId: 213504354 Change-Id: Iadd42f0ca4b7e7a9eae780bee9900c7233fb4f3f
2018-09-17runsc: Fix stdin/out/err in multi-container mode.Kevin Krakauer
Stdin/out/err weren't being sent to the sentry. PiperOrigin-RevId: 213307171 Change-Id: Ie4b634a58b1b69aa934ce8597e5cc7a47a2bcda2
2018-09-07runsc: Support multi-container exec.Nicolas Lacasse
We must use a context.Context with a Root Dirent that corresponds to the container's chroot. Previously we were using the root context, which does not have a chroot. Getting the correct context required refactoring some of the path-lookup code. We can't lookup the path without a context.Context, which requires kernel.CreateProcArgs, which we only get inside control.Execute. So we have to do the path lookup much later than we previously were. PiperOrigin-RevId: 212064734 Change-Id: I84a5cfadacb21fd9c3ab9c393f7e308a40b9b537
2018-09-07Remove '--file-access=direct' optionFabricio Voznika
It was used before gofer was implemented and it's not supported anymore. BREAKING CHANGE: proxy-shared and proxy-exclusive options are now: shared and exclusive. PiperOrigin-RevId: 212017643 Change-Id: If029d4073fe60583e5ca25f98abb2953de0d78fd
2018-09-05Enabled bind mounts in sub-containersFabricio Voznika
With multi-gofers, bind mounts in sub-containers should just work. Removed restrictions and added test. There are also a few cleanups along the way, e.g. retry unmounting in case cleanup races with gofer teardown. PiperOrigin-RevId: 211699569 Change-Id: Ic0a69c29d7c31cd7e038909cc686c6ac98703374
2018-09-05runsc: Promote getExecutablePathInternal to getExecutablePath.Nicolas Lacasse
Remove GetExecutablePath (the non-internal version). This makes path handling more consistent between exec, root, and child containers. The new getExecutablePath now uses MountNamespace.FindInode, which is more robust than Walking the Dirent tree ourselves. This also removes the last use of lstat(2) in the sentry, so that can be removed from the filters. PiperOrigin-RevId: 211683110 Change-Id: Ic8ec960fc1c267aa7d310b8efe6e900c88a9207a
2018-08-27Put fsgofer inside chrootFabricio Voznika
Now each container gets its own dedicated gofer that is chroot'd to the rootfs path. This is done to add an extra layer of security in case the gofer gets compromised. PiperOrigin-RevId: 210396476 Change-Id: Iba21360a59dfe90875d61000db103f8609157ca0
2018-08-24runsc: Allow runsc to properly search the PATH for executable name.Kevin Krakauer
Previously, runsc improperly attempted to find an executable in the container's PATH. We now search the PATH via the container's fsgofer rather than the host FS, eliminating the confusing differences between paths on the host and within a container. PiperOrigin-RevId: 210159488 Change-Id: I228174dbebc4c5356599036d6efaa59f28ff28d2
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