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2020-09-10arm64:place an SB sequence following an ERET instructionBin Lu
Some CPUs(eg: ampere-emag) can speculate past an ERET instruction and potentially perform speculative accesses to memory before processing the exception return. Since the register state is often controlled by a lower privilege level at the point of an ERET, this could potentially be used as part of a side-channel attack. Signed-off-by: Bin Lu <bin.lu@arm.com>
2020-09-09Unlock VFS.mountMu before FilesystemImpl calls for ↵Jamie Liu
/proc/[pid]/{mounts,mountinfo}. Also move VFS.MakeSyntheticMountpoint() (which is a utility wrapper around VFS.MkdirAllAt(), itself a utility wrapper around VFS.MkdirAt()) to not be in the middle of the implementation of these proc files. Fixes #3878 PiperOrigin-RevId: 330843106
2020-09-09Don't write VFS2 gofer client timestamps back on dentry destruction.Jamie Liu
This feature is too expensive for runsc, even with setattrclunk, because fsgofer.localFile.SetAttr() ends up needing to call reopenProcFD(), incurring two string allocations for the FD pathname, an fd.FD allocation, and two calls to runtime.SetFinalizer() when the fd.FD is created and closed respectively (b/133767962) (plus the actual cost of the syscalls, which is negligible). PiperOrigin-RevId: 330843012
2020-09-09Don't sched_setaffinity in ptrace platform.Jamie Liu
PiperOrigin-RevId: 330777900
2020-09-08Implement synthetic mountpoints for kernfs.Jamie Liu
PiperOrigin-RevId: 330629897
2020-09-08[vfs] overlayfs: Fix socket tests.Ayush Ranjan
- BindSocketThenOpen test was expecting the incorrect error when opening a socket. Fixed that. - VirtualFilesystem.BindEndpointAt should not require pop.Path.Begin.Ok() because the filesystem implementations do not need to walk to the parent dentry. This check also exists for MknodAt, MkdirAt, RmdirAt, SymlinkAt and UnlinkAt but those filesystem implementations also need to walk to the parent denty. So that check is valid. Added some syscall tests to test this. PiperOrigin-RevId: 330625220
2020-09-08Add check for both child and childMerkle ENOENTgVisor bot
The check in verity walk returns error for non ENOENT cases, and all ENOENT results should be checked. This case was missing. PiperOrigin-RevId: 330604771
2020-09-08Implement ioctl with enable veritygVisor bot
ioctl with FS_IOC_ENABLE_VERITY is added to verity file system to enable a file as verity file. For a file, a Merkle tree is built with its data. For a directory, a Merkle tree is built with the root hashes of its children. PiperOrigin-RevId: 330604368
2020-09-08[vfs] overlayfs: decref VD when not using it.Ayush Ranjan
overlay/filesystem.go:lookupLocked() did not DecRef the VD on some error paths when it would not end up saving or using the VD. PiperOrigin-RevId: 330589742
2020-09-08Honor readonly flag for root mountFabricio Voznika
Updates #1487 PiperOrigin-RevId: 330580699
2020-09-08Merge pull request #3856 from btw616:fix/issue-3855gVisor bot
PiperOrigin-RevId: 330565414
2020-09-08Improve type safety for transport protocol optionsGhanan Gowripalan
The existing implementation for TransportProtocol.{Set}Option take arguments of an empty interface type which all types (implicitly) implement; any type may be passed to the functions. This change introduces marker interfaces for transport protocol options that may be set or queried which transport protocol option types implement to ensure that invalid types are caught at compile time. Different interfaces are used to allow the compiler to enforce read-only or set-only socket options. RELNOTES: n/a PiperOrigin-RevId: 330559811
2020-09-08[vfs] Capitalize x in the {Get/Set/Remove/List}xattr functions.Ayush Ranjan
PiperOrigin-RevId: 330554450
2020-09-08Fix the use after nil check on args.MountNamespaceVFS2Tiwei Bie
The args.MountNamespaceVFS2 is used again after the nil check, instead, mntnsVFS2 which holds the expected reference should be used. This patch fixes this issue. Fixes: #3855 Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
2020-09-04Simplify FD handling for container start/execFabricio Voznika
VFS1 and VFS2 host FDs have different dupping behavior, making error prone to code for both. Change the contract so that FDs are released as they are used, so the caller can simple defer a block that closes all remaining files. This also addresses handling of partial failures. With this fix, more VFS2 tests can be enabled. Updates #1487 PiperOrigin-RevId: 330112266
2020-09-03Adjust input file offset when sendfile only completes a partial write.Dean Deng
Fixes #3779. PiperOrigin-RevId: 330057268
2020-09-02Fix Accept to not return error for sockets in accept queue.Bhasker Hariharan
Accept on gVisor will return an error if a socket in the accept queue was closed before Accept() was called. Linux will return the new fd even if the returned socket is already closed by the peer say due to a RST being sent by the peer. This seems to be intentional in linux more details on the github issue. Fixes #3780 PiperOrigin-RevId: 329828404
2020-09-02[vfs] Implement xattr for overlayfs.Ayush Ranjan
PiperOrigin-RevId: 329825497
2020-09-02[vfs] Fix error handling in overlayfs OpenAt.Ayush Ranjan
Updates #1199 PiperOrigin-RevId: 329802274
2020-09-01Implement setattr+clunk in 9PFabricio Voznika
This is to cover the common pattern: open->read/write->close, where SetAttr needs to be called to update atime/mtime before the file is closed. Benchmark results: BM_OpenReadClose/10240 CPU setattr+clunk: 63783 ns VFS2: 68109 ns VFS1: 72507 ns Updates #1198 PiperOrigin-RevId: 329628461
2020-09-01Refactor tty codebase to use master-replica terminology.Ayush Ranjan
Updates #2972 PiperOrigin-RevId: 329584905
2020-09-01Fix panic when calling dup2().Nayana Bidari
PiperOrigin-RevId: 329572337
2020-09-01[go-marshal] Enable auto-marshalling for fs/tty.Ayush Ranjan
PiperOrigin-RevId: 329564614
2020-09-01Automated rollback of changelist 328350576Nayana Bidari
PiperOrigin-RevId: 329526153
2020-08-31Don't use read-only host FD for writable gofer dentries in VFS2.Jamie Liu
As documented for gofer.dentry.hostFD. PiperOrigin-RevId: 329372319
2020-08-31Implement walk in gvisor verity fsgVisor bot
Implement walk directories in gvisor verity file system. For each step, the child dentry is verified against a verified parent root hash. PiperOrigin-RevId: 329358747
2020-08-28Fix kernfs.Dentry reference leak.Nicolas Lacasse
PiperOrigin-RevId: 329036994
2020-08-28Implement StatFS for various VFS2 filesystems.Rahat Mahmood
This mainly involved enabling kernfs' client filesystems to provide a StatFS implementation. Fixes #3411, #3515. PiperOrigin-RevId: 329009864
2020-08-28Fix EOF handling for splice.Dean Deng
Also, add corresponding EOF tests for splice/sendfile. Discovered by syzkaller. PiperOrigin-RevId: 328975990
2020-08-27[go-marshal] Enable auto-marshalling for tundev.Ayush Ranjan
PiperOrigin-RevId: 328863725
2020-08-27Fix vfs2 pipe behavior when splicing to a non-pipe.Dean Deng
Fixes *.sh Java runtime tests, where splice()-ing from a pipe to /dev/zero would not actually empty the pipe. There was no guarantee that the data would actually be consumed on a splice operation unless the output file's implementation of Write/PWrite actually called VFSPipeFD.CopyIn. Now, whatever bytes are "written" are consumed regardless of whether CopyIn is called or not. Furthermore, the number of bytes in the IOSequence for reads is now capped at the amount of data actually available. Before, splicing to /dev/zero would always return the requested splice size without taking the actual available data into account. This change also refactors the case where an input file is spliced into an output pipe so that it follows a similar pattern, which is arguably cleaner anyway. Updates #3576. PiperOrigin-RevId: 328843954
2020-08-27unix: return ECONNREFUSE if a socket file exists but a socket isn't bound to itAndrei Vagin
PiperOrigin-RevId: 328843560
2020-08-27[go-marshal] Support for usermem.IOOpts.Ayush Ranjan
PiperOrigin-RevId: 328839759
2020-08-27Improve type safety for socket optionsGhanan Gowripalan
The existing implementation for {G,S}etSockOpt take arguments of an empty interface type which all types (implicitly) implement; any type may be passed to the functions. This change introduces marker interfaces for socket options that may be set or queried which socket option types implement to ensure that invalid types are caught at compile time. Different interfaces are used to allow the compiler to enforce read-only or set-only socket options. Fixes #3714. RELNOTES: n/a PiperOrigin-RevId: 328832161
2020-08-27Add function to get error from a tcpip.EndpointGhanan Gowripalan
In an upcoming CL, socket option types are made to implement a marker interface with pointer receivers. Since this results in calling methods of an interface with a pointer, we incur an allocation when attempting to get an Endpoint's last error with the current implementation. When calling the method of an interface, the compiler is unable to determine what the interface implementation does with the pointer (since calling a method on an interface uses virtual dispatch at runtime so the compiler does not know what the interface method will do) so it allocates on the heap to be safe incase an implementation continues to hold the pointer after the functioon returns (the reference escapes the scope of the object). In the example below, the compiler does not know what b.foo does with the reference to a it allocates a on the heap as the reference to a may escape the scope of a. ``` var a int var b someInterface b.foo(&a) ``` This change removes the opportunity for that allocation. RELNOTES: n/a PiperOrigin-RevId: 328796559
2020-08-27ip6tables: (de)serialize ip6tables structsKevin Krakauer
More implementation+testing to follow. #3549. PiperOrigin-RevId: 328770160
2020-08-26Make flag propagation automaticFabricio Voznika
Use reflection and tags to provide automatic conversion from Config to flags. This makes adding new flags less error-prone, skips flags using default values (easier to read), and makes tests correctly use default flag values for test Configs. Updates #3494 PiperOrigin-RevId: 328662070
2020-08-26Merge pull request #3742 from lubinszARM:pr_n1_1gVisor bot
PiperOrigin-RevId: 328639254
2020-08-26Support stdlib analyzers with nogo.Adin Scannell
This immediately revealed an escape analysis violation (!), where the sync.Map was being used in a context that escapes were not allowed. This is a relatively minor fix and is included. PiperOrigin-RevId: 328611237
2020-08-26Remove spurious fd.IncRef().Nicolas Lacasse
PiperOrigin-RevId: 328583461
2020-08-26tmpfs: Allow xattrs in the trusted namespace if creds has CAP_SYS_ADMIN.Nicolas Lacasse
This is needed to support the overlay opaque attribute. PiperOrigin-RevId: 328552985
2020-08-25Use new reference count utility throughout gvisor.Dean Deng
This uses the refs_vfs2 template in vfs2 as well as objects common to vfs1 and vfs2. Note that vfs1-only refcounts are not replaced, since vfs1 will be deleted soon anyway. The following structs now use the new tool, with leak check enabled: devpts:rootInode fuse:inode kernfs:Dentry kernfs:dir kernfs:readonlyDir kernfs:StaticDirectory proc:fdDirInode proc:fdInfoDirInode proc:subtasksInode proc:taskInode proc:tasksInode vfs:FileDescription vfs:MountNamespace vfs:Filesystem sys:dir kernel:FSContext kernel:ProcessGroup kernel:Session shm:Shm mm:aioMappable mm:SpecialMappable transport:queue And the following use the template, but because they currently are not leak checked, a TODO is left instead of enabling leak check in this patch: kernel:FDTable tun:tunEndpoint Updates #1486. PiperOrigin-RevId: 328460377
2020-08-25Return non-zero size for tmpfs statfs(2).Jamie Liu
This does not implement accepting or enforcing any size limit, which will be more complex and has performance implications; it just returns a fixed non-zero size. Updates #1936 PiperOrigin-RevId: 328428588
2020-08-25Expose basic coverage information to userspace through kcov interface.Dean Deng
In Linux, a kernel configuration is set that compiles the kernel with a custom function that is called at the beginning of every basic block, which updates the memory-mapped coverage information. The Go coverage tool does not allow us to inject arbitrary instructions into basic blocks, but it does provide data that we can convert to a kcov-like format and transfer them to userspace through a memory mapping. Note that this is not a strict implementation of kcov, which is especially tricky to do because we do not have the same coverage tools available in Go that that are available for the actual Linux kernel. In Linux, a kernel configuration is set that compiles the kernel with a custom function that is called at the beginning of every basic block to write program counters to the kcov memory mapping. In Go, however, coverage tools only give us a count of basic blocks as they are executed. Every time we return to userspace, we collect the coverage information and write out PCs for each block that was executed, providing userspace with the illusion that the kcov data is always up to date. For convenience, we also generate a unique synthetic PC for each block instead of using actual PCs. Finally, we do not provide thread-specific coverage data (each kcov instance only contains PCs executed by the thread owning it); instead, we will supply data for any file specified by -- instrumentation_filter. Also, fix issue in nogo that was causing pkg/coverage:coverage_nogo compilation to fail. PiperOrigin-RevId: 328426526
2020-08-25[go-marshal] Enable auto-marshalling for host tty.Ayush Ranjan
PiperOrigin-RevId: 328415633
2020-08-25overlay: clonePrivateMount must pass a Dentry reference to MakeVirtualDentry.Nicolas Lacasse
PiperOrigin-RevId: 328410065
2020-08-25remove iptables sockopt special casesKevin Krakauer
iptables sockopts were kludged into an unnecessary check, this properly relegates them to the {get,set}SockOptIP functions. PiperOrigin-RevId: 328395135
2020-08-25Change "Fd" member to "FD" according to convensiongVisor bot
PiperOrigin-RevId: 328374775
2020-08-25Support SO_LINGER socket option.Nayana Bidari
When SO_LINGER option is enabled, the close will not return until all the queued messages are sent and acknowledged for the socket or linger timeout is reached. If the option is not set, close will return immediately. This option is mainly supported for connection oriented protocols such as TCP. PiperOrigin-RevId: 328350576
2020-08-25Fix TCP_LINGER2 behavior to match linux.Bhasker Hariharan
We still deviate a bit from linux in how long we will actually wait in FIN-WAIT-2. Linux seems to cap it with TIME_WAIT_LEN and it's not completely obvious as to why it's done that way. For now I think we can ignore that and fix it if it really is an issue. PiperOrigin-RevId: 328324922
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