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2020-10-12[vfs] kernfs: Fix inode memory leak issue.Ayush Ranjan
This change aims to fix the memory leak issue reported in #3933. Background: VFS2 kernfs kept accumulating invalid dentries if those dentries were not walked on. After substantial consideration of the problem by our team, we decided to have an LRU cache solution. This change is the first part to that solution, where we don't cache anything. The LRU cache can be added on top of this. What has changed: - Introduced the concept of an inode tree in kernfs.OrderedChildren. This is helpful is cases where the lifecycle of an inode is different from that of a dentry. - OrderedChildren now deals with initialized inodes instead of initialized dentries. It now implements Lookup() where it constructs a new dentry using the inode. - OrderedChildren holds a ref on all its children inodes. With this change, now an inode can "outlive" a dentry pointing to it. See comments in kernfs.OrderedChildren. - The kernfs dentry tree is solely maintained by kernfs only. Inode implementations can not modify the dentry tree. - Dentries that reach ref count 0 are removed from the dentry tree. - revalidateChildLocked now defer-DecRefs the newly created dentry from Inode.Lookup(), limiting its life to the current filesystem operation. If refs are picked on the dentry during the FS op (via an FD or something), then it will stick around and will be removed when the FD is closed. So there is essentially _no caching_ for Look()ed up dentries. - kernfs.DecRef does not have the precondition that fs.mu must be locked. Fixes #3933 PiperOrigin-RevId: 336768576
2020-10-12Merge pull request #4072 from adamliyi:droppt_fixgVisor bot
PiperOrigin-RevId: 336719900
2020-10-12[vfs2] Don't leak disconnected mounts.Dean Deng
PiperOrigin-RevId: 336694658
2020-10-09TCP Receive window advertisement fixes.Bhasker Hariharan
The fix in commit 028e045da93b7c1c26417e80e4b4e388b86a713d was incorrect as it can cause the right edge of the window to shrink when we announce a zero window due to receive buffer being full as its done before the check for seeing if the window is being shrunk because of the selected window. Further the window was calculated purely on available space but in cases where we are getting full sized segments it makes more sense to use the actual bytes being held. This CL changes to use the lower of the total available space vs the available space in the maximal window we could advertise minus the actual payload bytes being held. This change also cleans up the code so that the window selection logic is not duplicated between getSendParams() and windowCrossedACKThresholdLocked. PiperOrigin-RevId: 336404827
2020-10-09RACK: Detect packet reordering.Nayana Bidari
RACK detects packet reordering by checking if the sender received ACK for the packet which has the sequence number less than the already acknowledged packets. PiperOrigin-RevId: 336397526
2020-10-09Include stat in Verity hashChong Cai
PiperOrigin-RevId: 336395445
2020-10-09platform/kvm: remove the unused fieldAndrei Vagin
PiperOrigin-RevId: 336366624
2020-10-09Merge pull request #4040 from lemin9538:lemin_arm64gVisor bot
PiperOrigin-RevId: 336362818
2020-10-09Reduce the cost of sysinfo(2).Jamie Liu
- sysinfo(2) does not actually require a fine-grained breakdown of memory usage. Accordingly, instead of calling pgalloc.MemoryFile.UpdateUsage() to update the sentry's fine-grained memory accounting snapshot, just use pgalloc.MemoryFile.TotalUsage() (which is a single fstat(), and therefore far cheaper). - Use the number of threads in the root PID namespace (i.e. globally) rather than in the task's PID namespace for consistency with Linux (which just reads global variable nr_threads), and add a new method to kernel.PIDNamespace to allow this to be read directly from an underlying map rather than requiring the allocation and population of an intermediate slice. PiperOrigin-RevId: 336353100
2020-10-09Automated rollback of changelist 336304024Ghanan Gowripalan
PiperOrigin-RevId: 336339194
2020-10-09syscalls: Don't leak a file on the error pathAndrei Vagin
Reported-by: syzbot+bb82fb556d5d0a43f632@syzkaller.appspotmail.com PiperOrigin-RevId: 336324720
2020-10-09Automated rollback of changelist 336185457Bhasker Hariharan
PiperOrigin-RevId: 336304024
2020-10-08Only block resolution when NUD is incompleteGhanan Gowripalan
When a completed entry exists for a neighbor, there is no need to block while reachability is (re)confirmed. The stack should continue to use the neighbor's link address while NUD is performed. Test: stack_test.TestNeighborCacheReplace PiperOrigin-RevId: 336199043
2020-10-08Implement MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ.Jamie Liu
cf. 2a36ab717e8f "rseq/membarrier: Add MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ" PiperOrigin-RevId: 336186795
2020-10-08Do not resolve routes immediatelyGhanan Gowripalan
When a response needs to be sent to an incoming packet, the stack should consult its neighbour table to determine the remote address's link address. When an entry does not exist in the stack's neighbor table, the stack should queue the packet while link resolution completes. See comments. PiperOrigin-RevId: 336185457
2020-10-08Send unicast probes when link address is knownGhanan Gowripalan
When the neighbor table already has link address for a neighbor but is trying to confirm reachability, it may send unicast probes to the neighbor. PiperOrigin-RevId: 336166711
2020-10-08arm64: the mair_el1 value is wrongMin Le
the correct value needed is 0xbbff440c0400 but the const defined is 0x000000000000ffc0 due to the operator error in _MT_EL1_INIT, both kernel and user space memory attribute should be Normal memory not DEVICE_nGnRE Signed-off-by: Min Le <lemin.lm@antgroup.com>
2020-10-08Change IPv6 reassembly timeout to 60sArthur Sfez
It was originally set to 30s for IPv6 (same as IPv4) but this is not what RFC 8200 prescibes. Linux also defaults to 60s [1]. [1] https://github.com/torvalds/linux/blob/47ec5303d73ea344e84f46660fff693c57641386/include/net/ipv6.h#L456 PiperOrigin-RevId: 336034636
2020-10-07Add staticcheck and staticstyle analyzers.Adin Scannell
This change also adds support to go_stateify for detecting an appropriate receiver name, avoiding a large number of false positives. PiperOrigin-RevId: 335994587
2020-10-07Merge pull request #4376 from lubinszARM:pr_usr_tls_newgVisor bot
PiperOrigin-RevId: 335930035
2020-10-07Add precise synchronization to KVM.Adin Scannell
By using TSC scaling as a hack, we can trick the kernel into setting an offset of exactly zero. Huzzah! PiperOrigin-RevId: 335922019
2020-10-06Discard invalid Neighbor SolicitationsPeter Johnston
...per RFC 4861 s7.1.1. PiperOrigin-RevId: 335742851
2020-10-06Add support for IPv6 fragmentationArthur Sfez
Most of the IPv4 fragmentation code was moved in the fragmentation package and it is reused by IPv6 fragmentation. Test: - pkg/tcpip/network/ipv4:ipv4_test - pkg/tcpip/network/ipv6:ipv6_test - pkg/tcpip/network/fragmentation:fragmentation_test Fixes #4389 PiperOrigin-RevId: 335714280
2020-10-06Implement membarrier(2) commands other than *_SYNC_CORE.Jamie Liu
Updates #267 PiperOrigin-RevId: 335713923
2020-10-06Fix typo in merkletreegVisor bot
PiperOrigin-RevId: 335709552
2020-10-06[vfs2] Don't leak reference from Mountnamespace.Root().Dean Deng
PiperOrigin-RevId: 335583637
2020-10-05Fix IPv4 ICMP echo handler to copy optionsJulian Elischer
The IPv4 RFCs are specific (though obtuse) that an echo response packet needs to contain all the options from the echo request, much as if it been routed back to the sender, though apparently with a new TTL. They suggest copying the incoming packet header to achieve this so that is what this patch does. PiperOrigin-RevId: 335559176
2020-10-05Simplify nil assignment in kcov.Dean Deng
PiperOrigin-RevId: 335548610
2020-10-05Merge pull request #4079 from lemin9538:arm64_fixgVisor bot
PiperOrigin-RevId: 335532690
2020-10-05Enable more VFS2 testsFabricio Voznika
Updates #1487 PiperOrigin-RevId: 335516732
2020-10-05Merge pull request #4368 from zhlhahaha:1979gVisor bot
PiperOrigin-RevId: 335492800
2020-10-05Remove AssignableAddressEndpoint.NetworkEndpointGhanan Gowripalan
We can get the network endpoint directly from the NIC. This is a preparatory CL for when a Route needs to hold a dedicated NIC as its output interface. This is because when forwarding is enabled, packets may be sent from a NIC different from the NIC a route's local address is associated with. PiperOrigin-RevId: 335484500
2020-10-03Fix kcov enabling and disabling procedures.Dean Deng
- When the KCOV_ENABLE_TRACE ioctl is called with the trace kind KCOV_TRACE_PC, the kcov mode should be set to KCOV_*MODE*_TRACE_PC. - When the owning task of kcov exits, the memory mapping should not be cleared so it can be used by other tasks. - Add more tests (also tested on native Linux kcov). PiperOrigin-RevId: 335202585
2020-10-02kvm/x86: handle a case when interrupts are enabled in the kernel spaceAndrei Vagin
Before we thought that interrupts are always disabled in the kernel space, but here is a case when goruntime switches on a goroutine which has been saved in the host mode. On restore, the popf instruction is used to restore flags and this means that all flags what the goroutine has in the host mode will be restored in the kernel mode. And in the host mode, interrupts are always enabled. The long story short, we can't use the IF flag for determine whether a tasks is running in user or kernel mode. This patch reworks the code so that in userspace, the first bit of the IOPL flag will be always set. This doesn't give any new privilidges for a task because CPL in userspace is always 3. But then we can use this flag to distinguish user and kernel modes. The IOPL flag is never set in the kernel and host modes. Reported-by: syzbot+5036b325a8eb15c030cf@syzkaller.appspotmail.com Reported-by: syzbot+034d580e89ad67b8dc75@syzkaller.appspotmail.com Signed-off-by: Andrei Vagin <avagin@gmail.com>
2020-10-02Convert uses of the binary package in kernel to go-marshal.Rahat Mahmood
PiperOrigin-RevId: 335077195
2020-10-02Update minimum RTT for RACK.Nayana Bidari
We are currently tracking the minimum RTT for RACK as smoothed RTT. As per RFC minimum RTT can be a global minimum of all RTTs or filtered value of recent RTT measurements. In this cl minimum RTT is updated to global minimum of all RTTs for the connection. PiperOrigin-RevId: 335061518
2020-10-02Merge pull request #4035 from lubinszARM:pr_misc_01gVisor bot
PiperOrigin-RevId: 335051794
2020-10-01Add a verity test for modified parent Merkle fileChong Cai
When a child's root hash or its Merkle path is modified in its parent's Merkle tree file, opening the file should fail, provided the directory is verity enabled. The test for this behavior is added. PiperOrigin-RevId: 334963690
2020-09-30Merge pull request #3824 from btw616:fix/issue-3823gVisor bot
PiperOrigin-RevId: 334721453
2020-09-30ip6tables: redirect supportKevin Krakauer
Adds support for the IPv6-compatible redirect target. Redirection is a limited form of DNAT, where the destination is always the localhost. Updates #3549. PiperOrigin-RevId: 334698344
2020-09-30Count IP OutgoingPacketErrors in the NetworkEndpoint methodsArthur Sfez
Before this change, OutgoingPacketErrors was incremented in the stack.Route methods. This was going to be a problem once IPv4/IPv6 WritePackets support fragmentation because Route.WritePackets might now know how many packets are left after an error occurs. Test: - pkg/tcpip/network/ipv4:ipv4_test - pkg/tcpip/network/ipv6:ipv6_test PiperOrigin-RevId: 334687983
2020-09-30arm64 kvm: fix panic in kvm.dropPageTablesYi Li
Related with issue #3019, #4056. When running hello-world with gvisor-kvm, there is panic when exits: " panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x3c0 pc=0x7c3f18] goroutine 284 [running]: ... ... gvisor.dev/gvisor/pkg/sentry/platform/kvm.(*machine).dropPageTables(0x4000166840, 0x400032a040) pkg/sentry/platform/kvm/machine_arm64.go:111 +0x88 fp=0x4000479e00 sp=0x4000479da0 pc=0x7c3f18 " Also make dropPageTables() arch independent.
2020-09-30Implement ioctl with measure in verity fsChong Cai
PiperOrigin-RevId: 334682753
2020-09-30Internal change.Chong Cai
PiperOrigin-RevId: 334678513
2020-09-30Merge pull request #2256 from laijs:kptigVisor bot
PiperOrigin-RevId: 334674481
2020-09-30Use the ICMP error response facilityJulian Elischer
Add code in IPv6 to send ICMP packets while processing extension headers. Add some accounting in processing IPV6 Extension headers which allows us to report meaningful information back in ICMP parameter problem packets. IPv4 also needs to send a message when an unsupported protocol is requested. Add some tests to generate both ipv4 and ipv6 packets with various errors and check the responses. Add some new checkers and cleanup some inconsistencies in the messages in that file. Add new error types for the ICMPv4/6 generators. Fix a bug in the ICMPv4 generator that stopped it from generating "Unknown protocol" messages. Updates #2211 PiperOrigin-RevId: 334661716
2020-09-30[go-marshal] Port ext codebase to use go marshal.Ayush Ranjan
PiperOrigin-RevId: 334656292
2020-09-30Make all Target.Action implementation pointer receiversKevin Krakauer
PiperOrigin-RevId: 334652998
2020-09-30Add verity fs testsChong Cai
The tests confirms that when a file is opened in verity, the corresponding Merkle trees are generated. Also a normal read succeeds on verity enabled files, but fails if either the verity file or the Merkle tree file is modified. PiperOrigin-RevId: 334640331
2020-09-29Set transport protocol number during parsingKevin Krakauer
PiperOrigin-RevId: 334535896
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