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2021-05-25Use specific fmt verbs (avoid %v)Tamir Duberstein
Remove useless conversions. Avoid unhandled errors. PiperOrigin-RevId: 375834275
2021-05-25Merge pull request #6064 from sudo-sturbia:misspellinggVisor bot
PiperOrigin-RevId: 375789776
2021-05-25setgid directories for VFS1 tmpfs, overlayfs, and goferfsKevin Krakauer
PiperOrigin-RevId: 375780659
2021-05-25Use opaque types to represent timeTamir Duberstein
Introduce tcpip.MonotonicTime; replace int64 in tcpip.Clock method returns with time.Time and MonotonicTime to improve type safety and ensure that monotonic clock readings are never compared to wall clock readings. PiperOrigin-RevId: 375775907
2021-05-25Merge pull request #6027 from liornm:fix-unused-flaggVisor bot
PiperOrigin-RevId: 375740504
2021-05-24Fix misspellings.Zyad A. Ali
2021-05-21Add aggregated NIC statsArthur Sfez
This change also includes miscellaneous improvements: * UnknownProtocolRcvdPackets has been separated into two stats, to specify at which layer the unknown protocol was found (L3 or L4) * MalformedRcvdPacket is not aggregated across every endpoint anymore. Doing it this way did not add useful information, and it was also error-prone (example: ipv6 forgot to increment this aggregated stat, it only incremented its own ipv6.MalformedPacketsReceived). It is now only incremented the NIC. * Removed TestStatsString test which was outdated and had no real utility. PiperOrigin-RevId: 375057472
2021-05-21Clean-up netstack metrics descriptionsArthur Sfez
PiperOrigin-RevId: 375051638
2021-05-20Send SIGPIPE for closed pipes.Ian Lewis
Fixes #5974 Updates #161 PiperOrigin-RevId: 375024740
2021-05-20Merge pull request #6037 from sudo-sturbia:docgVisor bot
PiperOrigin-RevId: 375007632
2021-05-20Add protocol state to TCPINFOMithun Iyer
Add missing protocol state to TCPINFO struct and update packetimpact. This re-arranges the TCP state definitions to align with Linux. Fixes #478 PiperOrigin-RevId: 374996751
2021-05-20Fix cgroupfs mount racing with unmount.Rahat Mahmood
Previously, mount could discover a hierarchy being destroyed concurrently, which resulted in mount attempting to take a ref on an already destroyed cgroupfs. Reported-by: syzbot+062c0a67798a200f23ee@syzkaller.appspotmail.com PiperOrigin-RevId: 374959054
2021-05-20Format precondition to match style guide.Zyad A. Ali
2021-05-19Send ICMP errors when link address resolution failsNick Brown
Before this change, we would silently drop packets when link resolution failed. This change brings us into line with RFC 792 (IPv4) and RFC 4443 (IPv6), both of which specify that gateways should return an ICMP error to the sender when link resolution fails. PiperOrigin-RevId: 374699789
2021-05-19Allow use of IFF_ONE_QUEUEliornm
Before fix, use of this flag causes an error. It affects applications like OpenVPN which sets this flag for legacy reasons. According to linux/if_tun.h "This flag has no real effect".
2021-05-18Delete /cloud/gvisor/sandbox/sentry/gofer/opened_write_execute_file metricNayana Bidari
This metric is replaced by /cloud/gvisor/sandbox/sentry/suspicious_operations metric with field value opened_write_execute_file. PiperOrigin-RevId: 374509823
2021-05-14Add stuck tasks and startup stuck tasks to weirdness metricNayana Bidari
Weirdness metric will replace the below two metrics: - watchdog/stuck_startup_detected - watchdog/stuck_tasks_detected PiperOrigin-RevId: 373895696
2021-05-14Add new metric for suspicious operations.Nayana Bidari
The new metric contains fields and will replace the below existing metric: - opened_write_execute_file PiperOrigin-RevId: 373884604
2021-05-14Resolve remaining O_PATH TODOs.Dean Deng
O_PATH is now implemented in vfs2. Fixes #2782. PiperOrigin-RevId: 373861410
2021-05-14Don't read forwarding from netstack in sentryGhanan Gowripalan
https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt: /proc/sys/net/ipv4/* Variables: ip_forward - BOOLEAN 0 - disabled (default) not 0 - enabled Forward Packets between interfaces. This variable is special, its change resets all configuration parameters to their default state (RFC1122 for hosts, RFC1812 for routers) /proc/sys/net/ipv4/ip_forward only does work when its value is changed and always returns the last written value. The last written value may not reflect the current state of the netstack (e.g. when `ip_forward` was written a value of "1" then disable forwarding on an interface) so there is no need for sentry to probe netstack to get the current forwarding state of interfaces. ``` ~$ cat /proc/sys/net/ipv4/ip_forward 0 ~$ sudo bash -c "echo 1 > /proc/sys/net/ipv4/ip_forward" ~$ cat /proc/sys/net/ipv4/ip_forward 1 ~$ sudo sysctl -a | grep ipv4 | grep forward net.ipv4.conf.all.forwarding = 1 net.ipv4.conf.default.forwarding = 1 net.ipv4.conf.eno1.forwarding = 1 net.ipv4.conf.lo.forwarding = 1 net.ipv4.conf.wlp1s0.forwarding = 1 net.ipv4.ip_forward = 1 net.ipv4.ip_forward_update_priority = 1 net.ipv4.ip_forward_use_pmtu = 0 ~$ sudo sysctl -w net.ipv4.conf.wlp1s0.forwarding=0 net.ipv4.conf.wlp1s0.forwarding = 0 ~$ sudo sysctl -a | grep ipv4 | grep forward net.ipv4.conf.all.forwarding = 1 net.ipv4.conf.default.forwarding = 1 net.ipv4.conf.eno1.forwarding = 1 net.ipv4.conf.lo.forwarding = 1 net.ipv4.conf.wlp1s0.forwarding = 0 net.ipv4.ip_forward = 1 net.ipv4.ip_forward_update_priority = 1 net.ipv4.ip_forward_use_pmtu = 0 ~$ cat /proc/sys/net/ipv4/ip_forward 1 ~$ sudo bash -c "echo 1 > /proc/sys/net/ipv4/ip_forward" ~$ sudo sysctl -a | grep ipv4 | grep forward net.ipv4.conf.all.forwarding = 1 net.ipv4.conf.default.forwarding = 1 net.ipv4.conf.eno1.forwarding = 1 net.ipv4.conf.lo.forwarding = 1 net.ipv4.conf.wlp1s0.forwarding = 0 net.ipv4.ip_forward = 1 net.ipv4.ip_forward_update_priority = 1 net.ipv4.ip_forward_use_pmtu = 0 ~$ sudo bash -c "echo 0 > /proc/sys/net/ipv4/ip_forward" ~$ sudo sysctl -a | grep ipv4 | grep forward sysctl: unable to open directory "/proc/sys/fs/binfmt_misc/" net.ipv4.conf.all.forwarding = 0 net.ipv4.conf.default.forwarding = 0 net.ipv4.conf.eno1.forwarding = 0 net.ipv4.conf.lo.forwarding = 0 net.ipv4.conf.wlp1s0.forwarding = 0 net.ipv4.ip_forward = 0 net.ipv4.ip_forward_update_priority = 1 net.ipv4.ip_forward_use_pmtu = 0 ~$ cat /proc/sys/net/ipv4/ip_forward 0 ``` In the above example we can see that writing "1" to /proc/sys/net/ipv4/ip_forward configures the stack to be a router (all interfaces are configured to enable forwarding). However, if we manually update an interace (`wlp1s0`) to not forward packets, /proc/sys/net/ipv4/ip_forward continues to return the last written value of "1", even though not all interfaces will forward packets. Also note that writing the same value twice has no effect; work is performed iff the value changes. This change also removes the 'unset' state from sentry's ip forwarding data structures as an 'unset' ip forwarding value is the same as leaving forwarding disabled as the stack is always brought up with forwarding initially disabled; disabling forwarding on a newly created stack is a no-op. PiperOrigin-RevId: 373853106
2021-05-14Fix cgroup hierarchy registration.Rahat Mahmood
Previously, registration was racy because we were publishing hierarchies in the registry without fully initializing the underlying filesystem. This led to concurrent mount(2)s discovering the partially intialized filesystems and dropping the final refs on them which cause them to be freed prematurely. Reported-by: syzbot+13f54e77bdf59f0171f0@syzkaller.appspotmail.com Reported-by: syzbot+2c7f0a9127ac6a84f17e@syzkaller.appspotmail.com PiperOrigin-RevId: 373824552
2021-05-13Rename SetForwarding to SetForwardingDefaultAndAllNICsGhanan Gowripalan
...to make it clear to callers that all interfaces are updated with the forwarding flag and that future NICs will be created with the new forwarding state. PiperOrigin-RevId: 373618435
2021-05-12Fix TODO comments.Ian Lewis
Fix TODO comments referring to incorrect issue numbers. Also fix the link in issue reviver comments to include the right url fragment. PiperOrigin-RevId: 373491821
2021-05-12Send ICMP errors when unable to forward fragmented packetsNick Brown
Before this change, we would silently drop packets when the packet was too big to be sent out through the NIC (and, for IPv4 packets, if DF was set). This change brings us into line with RFC 792 (IPv4) and RFC 4443 (IPv6), both of which specify that gateways should return an ICMP error to the sender when the packet can't be fragmented. PiperOrigin-RevId: 373480078
2021-05-11[syserror] Refactor abi/linux.ErrnoZach Koopmans
PiperOrigin-RevId: 373265454
2021-05-11Internal change.gVisor bot
PiperOrigin-RevId: 373221316
2021-05-11Process Hop-by-Hop header when forwarding IPv6 packetsNick Brown
Currently, we process IPv6 extension headers when receiving packets but not when forwarding them. This is fine for the most part, with with one exception: RFC 8200 requires that we process the Hop-by-Hop headers even while forwarding packets. This CL adds that support by invoking the Hop-by-hop logic performed when receiving packets during forwarding as well. PiperOrigin-RevId: 373145478
2021-05-07Merge pull request #5758 from zhlhahaha:2125gVisor bot
PiperOrigin-RevId: 372608247
2021-05-07Init all vCPU when initializing machine on ARM64howard zhang
This patch is to solve problem that vCPU timer mess up when adding vCPU dynamically on ARM64, for detailed information please refer to: https://github.com/google/gvisor/issues/5739 There is no influence on x86 and here are main changes for ARM64: 1. create maxVCPUs number of vCPU in machine initialization 2. we want to sync gvisor vCPU number with host CPU number, so use smaller number between runtime.NumCPU and KVM_CAP_MAX_VCPUS to be maxVCPUS 3. put unused vCPUs into architecture-specific map initialvCPUs 4. When machine need to bind a new vCPU with tid, rather than creating new one, it would pick a vCPU from map initalvCPUs 5. change the setSystemTime function. When vCPU number increasing, the time cost for function setTSC(use syscall to set cntvoff) is liner growth from around 300 ns to 100000 ns, and this leads to the function setSystemTimeLegacy can not get correct offset value. 6. initializing StdioFDs and goferFD before a platform to avoid StdioFDs confects with vCPU fds Signed-off-by: howard zhang <howard.zhang@arm.com>
2021-05-06Implement /proc/cmdlineSteve Silva
This change implements /proc/cmdline with a basic faux command line "BOOT_IMAGE=/vmlinuz-[version]-gvisor quiet" so apps that may expect it do not receive errors. Also tests for the existence of /proc/cmdline as part of the system call test suite PiperOrigin-RevId: 372462070
2021-05-05Send ICMP errors when the network is unreachableNick Brown
Before this change, we would silently drop packets when unable to determine a route to the destination host. This change brings us into line with RFC 792 (IPv4) and RFC 4443 (IPv6), both of which specify that gateways should return an ICMP error to the sender when unable to reach the destination. Startblock: has LGTM from asfez and then add reviewer ghanan PiperOrigin-RevId: 372214051
2021-05-04Remove uses of the binary package from the rest of the sentry.Rahat Mahmood
PiperOrigin-RevId: 372020696
2021-05-03Fix deadlock in /proc/[pid]/fd/[num]Fabricio Voznika
In order to resolve path names, fsSymlink.Readlink() may need to reenter kernfs. Change the code so that kernfs.Inode.Readlink() is called without locks and document the new contract. PiperOrigin-RevId: 371770222
2021-05-01[perf] Check caching on IncRef'd dentries before the others.Ayush Ranjan
When a child is added to a parent (directory) dentry, both child and parent are queued for checkCachingLocked(). Make sure that the parent is queued first because the parent gained a ref and so could be removed from the LRU cache hence making space for the new child. This could prevent an LRU cache eviction. In practice, this did seem to help. ~800 RPCs were reduced while building //absl/... (ABSL build benchmark). Evictions hurt in 2 ways - create renameMu contention and destroy a possibly useful dentry which will have to be re-walked and re-opened later. Follow up fix for #5859. PiperOrigin-RevId: 371509392
2021-04-30kvm: prefault a root table page before switching into a user address spaceAndrei Vagin
The root table physical page has to be mapped to not fault in iret or sysret after switching into a user address space. sysret and iret are in the upper half that is global and so page tables of lower levels are already mapped. Fixes #5742 PiperOrigin-RevId: 371458644
2021-04-30Do not return content if verity translate failsChong Cai
If verification fails for translating mmapped memory, the content should not be returned. This is not an issue for panic mode, but for error mode we should return empty content along with the error. PiperOrigin-RevId: 371393519
2021-04-29[perf] Remove unnecessary existence checks in doCreateAt().Ayush Ranjan
Originally we were making a WalkGetAttrOne RPC to confirm that a file does not exist on the remote filesystem - when there was no cached information about the existence of a dentry at that position. This change avoids making that RPC and speculatively makes the mkdir/mknod/linkat/symlink RPC. They will fail with EEXIST if a file exists at that position as we want. However the error ordering is important. Existence check comes before writability check. So we make the existence check when the writability check fails and give it precedence. This change saves ~76,000 RPCs while building //absl/... (ABSL build benchmark). That is 10% of all RPCs made while running that workload. PiperOrigin-RevId: 371225633
2021-04-29Implement epoll_pwait2.Jing Chen
PiperOrigin-RevId: 371216407
2021-04-29Remove outdated TODOs in verityChong Cai
PiperOrigin-RevId: 371198372
2021-04-29Remove ResolvingPath.RestartFabricio Voznika
PiperOrigin-RevId: 371163405
2021-04-29Automated rollback of changelist 370733869Michael Pratt
PiperOrigin-RevId: 371131985
2021-04-28Automated rollback of changelist 369686285Fabricio Voznika
PiperOrigin-RevId: 371015541
2021-04-27Remove uses of the binary package from networking code.Rahat Mahmood
Co-Author: ayushranjan PiperOrigin-RevId: 370785009
2021-04-27Fix SyscallInfo for epoll_pwait in strace.Jing Chen
PiperOrigin-RevId: 370733869
2021-04-26Remove metrics: fallback, vsyscallCount and partialResultNayana Bidari
The newly added Weirdness metric with fields should be used instead of them. Simple query for weirdness metric: http://shortn/_DGNk0z2Up6 PiperOrigin-RevId: 370578132
2021-04-23hostinet: parse the timeval structure from a SO_TIMESTAMP control messageAndrei Vagin
PiperOrigin-RevId: 370181621
2021-04-22Fix AF_UNIX listen() w/ zero backlog.Bhasker Hariharan
In https://github.com/google/gvisor/commit/f075522849fa a check to increase zero to a minimum backlog length was removed from sys_socket.go to bring it in parity with linux and then in tcp/endpoint.go we bump backlog by 1. But this broke calling listen on a AF_UNIX socket w/ a zero backlog as in linux it does allow 1 connection even with a zero backlog. This was caught by a php runtime test socket_abstract_path.phpt. PiperOrigin-RevId: 369974744
2021-04-22Add weirdness sentry metric.Nayana Bidari
Weirdness metric contains fields to track the number of clock fallback, partial result and vsyscalls. This metric will avoid the overhead of having three different metrics (fallbackMetric, partialResultMetric, vsyscallCount). PiperOrigin-RevId: 369970218
2021-04-22Also report mount options through /proc/<pid>/mounts.Rahat Mahmood
PiperOrigin-RevId: 369967629
2021-04-21Only carry GSO options in the packet bufferGhanan Gowripalan
With this change, GSO options no longer needs to be passed around as a function argument in the write path. This change is done in preparation for a later change that defers segmentation, and may change GSO options for a packet as it flows down the stack. Updates #170. PiperOrigin-RevId: 369774872
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