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2018-08-14Fix bind() on overlays.Nicolas Lacasse
InodeOperations.Bind now returns a Dirent which will be cached in the Dirent tree. When an overlay is in-use, Bind cannot return the Dirent created by the upper filesystem because the Dirent does not know about the overlay. Instead, overlayBind must create a new overlay-aware Inode and Dirent and return that. This is analagous to how Lookup and overlayLookup work. PiperOrigin-RevId: 208670710 Change-Id: I6390affbcf94c38656b4b458e248739b4853da29
2018-08-13Prevent renames across walk fast path.Adin Scannell
PiperOrigin-RevId: 208533436 Change-Id: Ifc1a4e2d6438a424650bee831c301b1ac0d670a3
2018-08-10fs: Allow overlays to revalidate files from the upper fs.Nicolas Lacasse
Previously, an overlay would panic if either the upper or lower fs required revalidation for a given Dirent. Now, we allow revalidation from the upper file, but not the lower. If a cached overlay inode does need revalidation (because the upper needs revalidation), then the entire overlay Inode will be discarded and a new overlay Inode will be built with a fresh copy of the upper file. As a side effect of this change, Revalidate must take an Inode instead of a Dirent, since an overlay needs to revalidate individual Inodes. PiperOrigin-RevId: 208293638 Change-Id: Ic8f8d1ffdc09114721745661a09522b54420c5f1
2018-08-10Implemented the splice(2) syscall.Justine Olshan
Currently the implementation matches the behavior of moving data between two file descriptors. However, it does not implement this through zero-copy movement. Thus, this code is a starting point to build the more complex implementation. PiperOrigin-RevId: 208284483 Change-Id: Ibde79520a3d50bc26aead7ad4f128d2be31db14e
2018-08-10cache policy: Check policy before returning a negative dirent.Nicolas Lacasse
The cache policy determines whether Lookup should return a negative dirent, or just ENOENT. This CL fixes one spot where we returned a negative dirent without first consulting the policy. PiperOrigin-RevId: 208280230 Change-Id: I8f963bbdb45a95a74ad0ecc1eef47eff2092d3a4
2018-08-10Enable checkpoint/restore in cases of UDS use.Brielle Broder
Previously, processes which used file-system Unix Domain Sockets could not be checkpoint-ed in runsc because the sockets were saved with their inode numbers which do not necessarily remain the same upon restore. Now, the sockets are also saved with their paths so that the new inodes can be determined for the sockets based on these paths after restoring. Tests for cases with UDS use are included. Test cleanup to come. PiperOrigin-RevId: 208268781 Change-Id: Ieaa5d5d9a64914ca105cae199fd8492710b1d7ec
2018-08-10Validate FS.base before establishing it in the task's register set.Neel Natu
PiperOrigin-RevId: 208229341 Change-Id: I5d84bc52bbafa073446ef497e56958d0d7955aa8
2018-08-09Fix missing O_LARGEFILE from O_CREAT filesMichael Pratt
Cleanup some more syscall.O_* references while we're here. PiperOrigin-RevId: 208133460 Change-Id: I48db71a38f817e4f4673977eafcc0e3874eb9a25
2018-08-08Basic support for ip link/addr and ifconfigFabricio Voznika
Closes #94 PiperOrigin-RevId: 207997580 Change-Id: I19b426f1586b5ec12f8b0cd5884d5b401d334924
2018-08-08Protect PCIDs with a mutex.Adin Scannell
Because the Drop method may be called across vCPUs, it is necessary to protect the PCID database with a mutex to prevent concurrent modification. The PCID is assigned prior to entersyscall, so it's safe to block. PiperOrigin-RevId: 207992864 Change-Id: I8b36d55106981f51e30dcf03e12886330bb79d67
2018-08-08Enable SACK in runscFabricio Voznika
SACK is disabled by default and needs to be manually enabled. It not only improves performance, but also fixes hangs downloading files from certain websites. PiperOrigin-RevId: 207906742 Change-Id: I4fb7277b67bfdf83ac8195f1b9c38265a0d51e8b
2018-08-07Hold TaskSet.mu in Task.Parent.Jamie Liu
PiperOrigin-RevId: 207766238 Change-Id: Id3b66d8fe1f44c3570f67fa5ae7ba16021e35be1
2018-08-07fs: Add new cache policy "remote_revalidate".Nicolas Lacasse
This CL adds a new cache-policy for gofer filesystems that uses the host page cache, but causes dirents to be reloaded on each Walk, and does not cache readdir results. This policy is useful when the remote filesystem may change out from underneath us, as any remote changes will be reflected on the next Walk. Importantly, this cache policy is only consistent if we do not use gVisor's internal page cache, since that page cache is tied to the Inode and may be thrown away upon Revalidation. This cache policy should only be used when the gofer supports donating host FDs, since then gVisor will make use of the host kernel page cache, which will be consistent for all open files in the gofer. In fact, a panic will be raised if a file is opened without a donated FD. PiperOrigin-RevId: 207752937 Change-Id: I233cb78b4695bbe00a4605ae64080a47629329b8
2018-08-07sentry: make epoll.pollEntry wait for the file operation in restore.Zhaozhong Ni
PiperOrigin-RevId: 207737935 Change-Id: I3a301ece1f1d30909715f36562474e3248b6a0d5
2018-08-06Make ramfs.File savableMichael Pratt
In other news, apparently proc.fdInfo is the last user of ramfs.File. PiperOrigin-RevId: 207564572 Change-Id: I5a92515698cc89652b80bea9a32d309e14059869
2018-08-06Fix a bug in PCIDs.AssignShiruRen
Store the new assigned pcid in p.cache[pt]. Signed-off-by: ShiruRen <renshiru2000@gmail.com> Change-Id: I4aee4e06559e429fb5e90cb9fe28b36139e3b4b6 PiperOrigin-RevId: 207563833
2018-08-03stateify: make explicit mode no longer optional.Zhaozhong Ni
PiperOrigin-RevId: 207303405 Change-Id: I17b6433963d78e3631a862b7ac80f566c8e7d106
2018-08-02Copy creds in accessMichael Pratt
PiperOrigin-RevId: 207181631 Change-Id: Ic6205278715a9260fb970efb414fc758ea72c4c6
2018-08-02Update comment referenceMichael Pratt
PiperOrigin-RevId: 207180809 Change-Id: I08c264812919e81b2c56fdd4a9ef06924de8b52f
2018-08-02Automated rollback of changelist 207037226Zhaozhong Ni
PiperOrigin-RevId: 207125440 Change-Id: I6c572afb4d693ee72a0c458a988b0e96d191cd49
2018-08-02Add seccomp(2) support.Brian Geffon
Add support for the seccomp syscall and the flag SECCOMP_FILTER_FLAG_TSYNC. PiperOrigin-RevId: 207101507 Change-Id: I5eb8ba9d5ef71b0e683930a6429182726dc23175
2018-08-01Automated rollback of changelist 207007153Michael Pratt
PiperOrigin-RevId: 207037226 Change-Id: I8b5f1a056d4f3eab17846f2e0193bb737ecb5428
2018-08-01stateify: convert all packages to use explicit mode.Zhaozhong Ni
PiperOrigin-RevId: 207007153 Change-Id: Ifedf1cc3758dc18be16647a4ece9c840c1c636c9
2018-08-01New conditional for adding key/value pairs to maps.Brielle Broder
When adding MultiDeviceKeys and their values into MultiDevice maps, make sure the keys and values have not already been added. This ensures that preexisting key/value pairs are not overridden. PiperOrigin-RevId: 206942766 Change-Id: I9d85f38eb59ba59f0305e6614a52690608944981
2018-07-31proc: show file flags in fdinfoAndrei Vagin
Currently, there is an attempt to print FD flags, but they are not decoded into a number, so we see something like this: /criu # cat /proc/self/fdinfo/0 flags: {%!o(bool=000false)} Actually, fdinfo has to contain file flags. Change-Id: Idcbb7db908067447eb9ae6f2c3cfb861f2be1a97 PiperOrigin-RevId: 206794498
2018-07-27Added the O_LARGEFILE flag.Justine Olshan
This flag will always be true for gVisor files. PiperOrigin-RevId: 206355963 Change-Id: I2f03d2412e2609042df43b06d1318cba674574d0
2018-07-27stateify: support explicit annotation mode; convert refs and stack packages.Zhaozhong Ni
We have been unnecessarily creating too many savable types implicitly. PiperOrigin-RevId: 206334201 Change-Id: Idc5a3a14bfb7ee125c4f2bb2b1c53164e46f29a8
2018-07-26Don't copy-up extended attributes that specifically configure a lower overlay.Nicolas Lacasse
When copying-up files from a lower fs to an upper, we also copy the extended attributes on the file. If there is a (nested) overlay inside the lower, some of these extended attributes configure the lower overlay, and should not be copied-up to the upper. In particular, whiteout attributes in the lower fs overlay should not be copied-up, since the upper fs may actually contain the file. PiperOrigin-RevId: 206236010 Change-Id: Ia0454ac7b99d0e11383f732a529cb195ed364062
2018-07-25Format openat flagsMichael Pratt
PiperOrigin-RevId: 206021774 Change-Id: I447b6c751c28a8d8d4d78468b756b6ad8c61e169
2018-07-24Typo fix.Kevin Krakauer
PiperOrigin-RevId: 205880843 Change-Id: If2272b25f08a18ebe9b6309a1032dd5cdaa59866
2018-07-23Add KVM and overlay dimensions to container_testFabricio Voznika
PiperOrigin-RevId: 205714667 Change-Id: I317a2ca98ac3bdad97c4790fcc61b004757d99ef
2018-07-20Format getcwd pathMichael Pratt
PiperOrigin-RevId: 205440332 Change-Id: I2a838f363e079164c83da88e1b0b8769844fe79b
2018-07-19kernel: mutations on creds now require a copy.Adin Scannell
PiperOrigin-RevId: 205315612 Change-Id: I9a0a1e32c8abfb7467a38743b82449cc92830316
2018-07-19fs: Pass context to Revalidate() function.Nicolas Lacasse
The current revalidation logic is very simple and does not do much introspection of the dirent being revalidated (other than looking at the type of file). Fancier revalidation logic is coming soon, and we need to be able to look at the cached and uncached attributes of a given dirent, and we need a context to perform some of these operations. PiperOrigin-RevId: 205307351 Change-Id: If17ea1c631d8f9489c0e05a263e23d7a8a3bf159
2018-07-19ConfigureMMap on an overlay file delegates to the upper if there is no lower.Nicolas Lacasse
In the general case with an overlay, all mmap calls must go through the overlay, because in the event of a copy-up, the overlay needs to invalidate any previously-created mappings. If there if no lower file, however, there will never be a copy-up, so the overlay can delegate directly to the upper file in that case. This also allows us to correctly mmap /dev/zero when it is in an overlay. This file has special semantics which the overlay does not know about. In particular, it does not implement Mappable(), which (in the general case) the overlay uses to detect if a file is mappable or not. PiperOrigin-RevId: 205306743 Change-Id: I92331649aa648340ef6e65411c2b42c12fa69631
2018-07-19Add AT_UID, AT_EUID, AT_GID, AT_EGID to aux vector.Brian Geffon
With musl libc when these entries are missing from the aux vector it's forcing libc.secure (effectively AT_SECURE). This mode prevents RPATH and LD_LIBRARY_PATH from working. https://git.musl-libc.org/cgit/musl/tree/ldso/dynlink.c#n1488 As the first entry is a mask of all the aux fields set: https://git.musl-libc.org/cgit/musl/tree/ldso/dynlink.c#n187 PiperOrigin-RevId: 205284684 Change-Id: I04de7bab241043306b4f732306a81d74edfdff26
2018-07-19sentry: save stack in proc net dev.Zhaozhong Ni
PiperOrigin-RevId: 205253858 Change-Id: Iccdc493b66d1b4d39de44afb1184952183b1283f
2018-07-18Fix lock-ordering violation in Create by logging BaseName instead of FullName.Nicolas Lacasse
Dirent.FullName takes the global renameMu, but can be called during Create, which itself takes dirent.mu and dirent.dirMu, which is a lock-order violation: Dirent.Create d.dirMu.Lock d.mu.Lock Inode.Create gofer.inodeOperations.Create gofer.NewFile Dirent.FullName d.renameMu.RLock We only use the FullName here for logging, and in this case we can get by with logging only the BaseName. A `BaseName` method was added to Dirent, which simply returns the name, taking d.parent.mu as required. In the Create pathway, we can't call d.BaseName() because taking d.parent.mu after d.mu violates the lock order. But we already know the base name of the file we just created, so that's OK. In the Open/GetFile pathway, we are free to call d.BaseName() because the other dirent locks are not held. PiperOrigin-RevId: 205112278 Change-Id: Ib45c734081aecc9b225249a65fa8093eb4995f10
2018-07-17Merge FileMem.usage in IncRefMichael Pratt
Per the doc, usage must be kept maximally merged. Beyond that, it is simply a good idea to keep fragmentation in usage to a minimum. The glibc malloc allocator allocates one page at a time, potentially causing lots of fragmentation. However, those pages are likely to have the same number of references, often making it possible to merge ranges. PiperOrigin-RevId: 204960339 Change-Id: I03a050cf771c29a4f05b36eaf75b1a09c9465e14
2018-07-16Add CPUID faulting for ptrace and KVM.Adin Scannell
PiperOrigin-RevId: 204858314 Change-Id: I8252bf8de3232a7a27af51076139b585e73276d4
2018-07-16Start allocation and reclaim scans only where they may find a matchMichael Pratt
If usageSet is heavily fragmented, findUnallocatedRange and findReclaimable can spend excessive cycles linearly scanning the set for unallocated/free pages. Improve common cases by beginning the scan only at the first page that could possibly contain an unallocated/free page. This metadata only guarantees that there is no lower unallocated/free page, but a scan may still be required (especially for multi-page allocations). That said, this heuristic can still provide significant performance improvements for certain applications. PiperOrigin-RevId: 204841833 Change-Id: Ic41ad33bf9537ecd673a6f5852ab353bf63ea1e6
2018-07-16Add EventOperations.HostFD()Neel Natu
This method allows an eventfd inside the Sentry to be registered with with the host kernel. Update comment about memory mapping host fds via CachingInodeOperations. PiperOrigin-RevId: 204784859 Change-Id: I55823321e2d84c17ae0f7efaabc6b55b852ae257
2018-07-13Allow a filesystem to control its visibility in /proc/filesystems.Neel Natu
PiperOrigin-RevId: 204508520 Change-Id: I09e5f8b6e69413370e1a0d39dbb7dc1ee0b6192d
2018-07-13Note that Mount errors do not require translationsMichael Pratt
PiperOrigin-RevId: 204490639 Change-Id: I0fe26306bae9320c6aa4f854fe0ef25eebd93233
2018-07-12Fix aio eventfd lookupMichael Pratt
We're failing to set eventFile in the outer scope. PiperOrigin-RevId: 204392995 Change-Id: Ib9b04f839599ef552d7b5951d08223e2b1d5f6ad
2018-07-12sentry: wait for restore clock instead of panicing in Timekeeper.Zhaozhong Ni
PiperOrigin-RevId: 204372296 Change-Id: If1ed9843b93039806e0c65521f30177dc8036979
2018-07-12sentry: save inet stacks in proc files.Zhaozhong Ni
PiperOrigin-RevId: 204362791 Change-Id: If85ea7442741e299f0d7cddbc3d6b415e285da81
2018-07-12Format documentationMichael Pratt
PiperOrigin-RevId: 204323728 Change-Id: I1ff9aa062ffa12583b2e38ec94c87db7a3711971
2018-07-11Move ptrace constants to abi/linux.Jamie Liu
PiperOrigin-RevId: 204188763 Change-Id: I5596ab7abb3ec9e210a7f57b3fc420e836fa43f3
2018-07-11Add MemoryManager.Pin.Jamie Liu
PiperOrigin-RevId: 204162313 Change-Id: Ib0593dde88ac33e222c12d0dca6733ef1f1035dc
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