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2020-07-07Deflake exec test.Jamie Liu
- Only use MAXSYMLINKS/2+1 symlinks for each of the interpreter and script paths in SymlinkLimitRefreshedForInterpreter to tolerate cases where the original paths (/tmp, /bin, or /bin/echo) themselves contain symlinks. - Ensure that UnshareFiles performs execve immediately after clone(CLONE_VFORK) (no heap allocation for ExecveArray/RunfilesPath). - Use lstat() rather than stat() for the existence check in fs_util's Exists; the latter will fail if the symlink target does not exist, even if the symlink does. PiperOrigin-RevId: 320110156
2020-07-07Set IPv4 ID on all non-atomic datagramsTony Gong
RFC 6864 imposes various restrictions on the uniqueness of the IPv4 Identification field for non-atomic datagrams, defined as an IP datagram that either can be fragmented (DF=0) or is already a fragment (MF=1 or positive fragment offset). In order to be compliant, the ID field is assigned for all non-atomic datagrams. Add a TCP unit test that induces retransmissions and checks that the IPv4 ID field is unique every time. Add basic handling of the IP_MTU_DISCOVER socket option so that the option can be used to disable PMTU discovery, effectively setting DF=0. Attempting to set the sockopt to anything other than disabled will fail because PMTU discovery is currently not implemented, and the default behavior matches that of disabled. PiperOrigin-RevId: 320081842
2020-07-07Fix mknod and inotify syscall testAyush Ranjan
This change fixes a few things: - creating sockets using mknod(2) is supported via vfs2 - fsgofer can create regular files via mknod(2) - mode = 0 for mknod(2) will be interpreted as regular file in vfs2 as well Updates #2923 PiperOrigin-RevId: 320074267
2020-07-06Add support for SO_RCVBUF/SO_SNDBUF for AF_PACKET sockets.Bhasker Hariharan
Updates #2746 PiperOrigin-RevId: 319887810
2020-07-06Merge pull request #3110 from craig08:add-missing-ICRNLgVisor bot
PiperOrigin-RevId: 319827554
2020-07-01Update preadv2/pwritev2 flag handling in vfs2.Dean Deng
We do not support RWF_SYNC/RWF_DSYNC and probably shouldn't silently accept them, since the user may incorrectly believe that we are synchronizing I/O. Remove the pwritev2 test verifying that we support these flags. gvisor.dev/issue/2601 is the tracking bug for deciding which RWF_.* flags we need and supporting them. Updates #2923, #2601. PiperOrigin-RevId: 319351286
2020-07-01[vfs2][gofer] Fix mmap syscall test.Ayush Ranjan
We were not invalidating mappings when the file size changed in shared mode. Enabled the syscall test for vfs2. Updates #2923 PiperOrigin-RevId: 319346569
2020-07-01Port vfs1 implementation of sync_file_range to vfs2.Dean Deng
Currently, we always perform a full-file sync which could be extremely expensive for some applications. Although vfs1 did not fully support sync_file_range, there were some optimizations that allowed us skip some unnecessary write-outs. Updates #2923, #1897. PiperOrigin-RevId: 319324213
2020-07-01Use directory fds in sticky test to avoid permission issues.Dean Deng
After we change credentials, it is possible that we no longer have access to the sticky directory where we are trying to delete files. Use an open fd so this is not an issue. PiperOrigin-RevId: 319306255
2020-07-01Port fallocate to VFS2.Zach Koopmans
PiperOrigin-RevId: 319283715
2020-07-01Complete async signal delivery support in vfs2.Dean Deng
- Support FIOASYNC, FIO{SET,GET}OWN, SIOC{G,S}PGRP (refactor getting/setting owner in the process). - Unset signal recipient when setting owner with pid == 0 and valid owner type. Updates #2923. PiperOrigin-RevId: 319231420
2020-06-30Remove struct packing to fix compiler warning.Dean Deng
-Waddress-of-packed-member warns on inet_aton() being used with a packed struct member. This was added in cl/291990716. PiperOrigin-RevId: 319111253
2020-06-30Add build target for the provisional style guide.Dean Deng
This includes the provisional style guide in the website and fixes the broken link from CONTRIBUTING.md. The style guide will be located under the "Community" category as it's related to contributing to the project. Also, add missing includes that were causing some presubmits to fail. PiperOrigin-RevId: 319061410
2020-06-30Add missing ICRNL flag in master termios testCraig Chi
Closes #2768
2020-06-29Refactor udp_socket_testZach Koopmans
Bring udp_socket_test into complianc by: - Eliminating IsRunningOnGvisor() invocations. - Wrapping sockets in RAII FileDescriptor objects. - Creating a Bind() method so that the first bind happens on port 0. PiperOrigin-RevId: 318909396
2020-06-27Port GETOWN, SETOWN fcntls to vfs2.Dean Deng
Also make some fixes to vfs1's F_SETOWN. The fcntl test now entirely passes on vfs2. Fixes #2920. PiperOrigin-RevId: 318669529
2020-06-27Support sticky bit in vfs2.Dean Deng
Updates #2923. PiperOrigin-RevId: 318648128
2020-06-26Add tests for eventfd/timerfd/inotify operations that should return ESPIPE.Dean Deng
PiperOrigin-RevId: 318585377
2020-06-26IPv6 raw sockets. Needed for ip6tables.Kevin Krakauer
IPv6 raw sockets never include the IPv6 header. PiperOrigin-RevId: 318582989
2020-06-26Implement SO_NO_CHECK socket option.gVisor bot
SO_NO_CHECK is used to skip the UDP checksum generation on a TX socket (UDP checksum is optional on IPv4). Test: - TestNoChecksum - SoNoCheckOffByDefault (UdpSocketTest) - SoNoCheck (UdpSocketTest) Fixes #3055 PiperOrigin-RevId: 318575215
2020-06-26Require CAP_SYS_ADMIN in the root user namespace for TTY theftKevin Krakauer
PiperOrigin-RevId: 318563543
2020-06-26Support inotify IN_ONESHOT.Dean Deng
Also, while we're here, make sure that gofer inotify events are generated when files are created in remote revalidating mode. Updates #1479. PiperOrigin-RevId: 318536354
2020-06-25Test that the fuse device can be openedRidwan Sharif
2020-06-25Moved FUSE device under the fuse directoryRidwan Sharif
2020-06-25Add FUSE character deviceRidwan Sharif
This change adds a FUSE character device backed by devtmpfs. This device will be used to establish a connection between the FUSE server daemon and fusefs. The FileDescriptionImpl methods will be implemented as we flesh out fusefs some more. The tests assert that the device can be opened and used.
2020-06-24Fix procfs bugs in vfs2.Dean Deng
- Support writing on proc/[pid]/{uid,gid}map - Return EIO for writing to static files. Updates #2923. PiperOrigin-RevId: 318188503
2020-06-24Internal change.gVisor bot
PiperOrigin-RevId: 318180382
2020-06-24Port /dev/net/tun device to VFS2.Nicolas Lacasse
Updates #2912 #1035 PiperOrigin-RevId: 318162565
2020-06-23Add support for SO_REUSEADDR to TCP sockets/endpoints.Ian Gudger
For TCP sockets, SO_REUSEADDR relaxes the rules for binding addresses. gVisor/netstack already supported a behavior similar to SO_REUSEADDR, but did not allow disabling it. This change brings the SO_REUSEADDR behavior closer to the behavior implemented by Linux and adds a new SO_REUSEADDR disabled behavior. Like Linux, SO_REUSEADDR is now disabled by default. PiperOrigin-RevId: 317984380
2020-06-23Port /dev/tty device to VFS2.Nicolas Lacasse
Support is limited to the functionality that exists in VFS1. Updates #2923 #1035 PiperOrigin-RevId: 317981417
2020-06-23Complete inotify IN_EXCL_UNLINK implementation in VFS2.Dean Deng
Events were only skipped on parent directories after their children were unlinked; events on the unlinked file itself need to be skipped as well. As a result, all Watches.Notify() calls need to know whether the dentry where the call came from was unlinked. Updates #1479. PiperOrigin-RevId: 317979476
2020-06-23Nit fix: Create and use a std::string object for `const char*`.Ting-Yu Wang
PiperOrigin-RevId: 317973144
2020-06-23Support inotify in vfs2 gofer fs.Dean Deng
Because there is no inode structure stored in the sandbox, inotify watches must be held on the dentry. This would be an issue in the presence of hard links, where multiple dentries would need to share the same set of watches, but in VFS2, we do not support the internal creation of hard links on gofer fs. As a result, we make the assumption that every dentry corresponds to a unique inode. Furthermore, dentries can be cached and then evicted, even if the underlying file has not be deleted. We must prevent this from occurring if there are any watches that would be lost. Note that if the dentry was deleted or invalidated (d.vfsd.IsDead()), we should still destroy it along with its watches. Additionally, when a dentry’s last watch is removed, we cache it if it also has zero references. This way, the dentry can eventually be evicted from memory if it is no longer needed. This is accomplished with a new dentry method, OnZeroWatches(), which is called by Inotify.RmWatch and Inotify.Release. Note that it must be called after all inotify locks are released to avoid violating lock order. Stress tests are added to make sure that inotify operations don't deadlock with gofer.OnZeroWatches. Updates #1479. PiperOrigin-RevId: 317958034
2020-06-23Deflake proc test: Don't fail on DT_UNKNOWN.Ting-Yu Wang
Per manual page: "All applications must properly handle a return of DT_UNKNOWN." PiperOrigin-RevId: 317957013
2020-06-23Port readahead to VFS2.Nicolas Lacasse
It preserves the same functionality (almost none) as in VFS1. Updates #2923 #1035 PiperOrigin-RevId: 317943522
2020-06-22Check for invalid trailing / when traversing path in gofer OpenAt.Dean Deng
Updates #2923. PiperOrigin-RevId: 317700049
2020-06-22Allow readdir(/proc/[tid]/net) to return EINVAL on a zombie task.Nicolas Lacasse
Despite what the man page says, linux will return EINVAL when calling getdents() an a /proc/[tid]/net file corresponding to a zombie task. This causes readdir() to return a null pointer AND errno=EINVAL. See fs/proc/proc_net.c:proc_tgid_net_readdir() for where this occurs. We have tests that recursively read /proc, and are likely to hit this when running natively, so we must catch and handle this case. PiperOrigin-RevId: 317674168
2020-06-19Enable passing vfs2 tests.Dean Deng
I forgot to update getdents earlier. Several thousand runs of the fsync and proc_net_unix tests all passed as well. Updates #2923. PiperOrigin-RevId: 317415488
2020-06-19Port fadvise64 to vfs2.Dean Deng
Like vfs1, we have a trivial implementation that ignores all valid advice. Updates #2923. PiperOrigin-RevId: 317349505
2020-06-19Fix vfs2 handling of preadv2/pwritev2 flags.Dean Deng
Check for unsupported flags, and silently support RWF_HIPRI by doing nothing. From pkg/abi/linux/file.go: "gVisor does not implement the RWF_HIPRI feature, but the flag is accepted as a valid flag argument for preadv2/pwritev2." Updates #2923. PiperOrigin-RevId: 317330631
2020-06-19Don't adjust parent link count if we replace a child dir with another.Dean Deng
Updates #2923. PiperOrigin-RevId: 317314460
2020-06-19Fix synthetic file bugs in gofer fs.Dean Deng
Always check if a synthetic file already exists at a location before creating a file there, and do not try to delete synthetic gofer files from the remote fs. This fixes runsc_ptrace socket tests that create/unlink synthetic, named socket files. Updates #2923. PiperOrigin-RevId: 317293648
2020-06-18Fix vfs2 tmpfs link permission checks.Dean Deng
Updates #2923. PiperOrigin-RevId: 317246916
2020-06-18Enable more VFS2 syscall testsFabricio Voznika
Updates #2923 PiperOrigin-RevId: 317185798
2020-06-18Remove various uses of 'whitelist'Michael Pratt
Updates #2972 PiperOrigin-RevId: 317113059
2020-06-18Support setsockopt SO_SNDBUF/SO_RCVBUF for raw/udp sockets.Bhasker Hariharan
Updates #173,#6 Fixes #2888 PiperOrigin-RevId: 317087652
2020-06-17Add test for stat("/proc/net/snmp").Ian Gudger
PiperOrigin-RevId: 316974863
2020-06-17Proc test: Allow root mount pathname to be non-root.Nicolas Lacasse
The test was expecting that the root mount pathname was "/", but it doesn't need to be. Only the mount point actually should be "/" (otherwise it is not the root). PiperOrigin-RevId: 316968025
2020-06-17Fix TtlDefault test on linux.Bhasker Hariharan
Different flavors of linux seem to use different defaults we accept 64 or 127 as the TtlDefault in the test. PiperOrigin-RevId: 316961150
2020-06-17Implement POSIX locksFabricio Voznika
- Change FileDescriptionImpl Lock/UnlockPOSIX signature to take {start,length,whence}, so the correct offset can be calculated in the implementations. - Create PosixLocker interface to make it possible to share the same locking code from different implementations. Closes #1480 PiperOrigin-RevId: 316910286
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