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2018-06-25Don't read FSContext.root without holding FSContext.muMichael Pratt
IsChrooted still has the opportunity to race with another thread entering the FSContext into a chroot, but that is unchanged (and fine, AFAIK). PiperOrigin-RevId: 202029117 Change-Id: I38bce763b3a7715fa6ae98aa200a19d51a0235f1
2018-06-22Add rpcinet support for SIOCGIFCONF.Brian Geffon
The interfaces and their addresses are already available via the stack Intefaces and InterfaceAddrs. Also add some tests as we had no tests around SIOCGIFCONF. I also added the socket_netgofer lifecycle for IOCTL tests. PiperOrigin-RevId: 201744863 Change-Id: Ie0a285a2a2f859fa0cafada13201d5941b95499a
2018-06-22Simplify some handle logic.Nicolas Lacasse
PiperOrigin-RevId: 201738936 Change-Id: Ib75136415e28e8df0c742acd6b9512d4809fe3a8
2018-06-22Handle mremap(old_size=0).Jamie Liu
PiperOrigin-RevId: 201729703 Change-Id: I486900b0c6ec59533b88da225a5829c474e35a70
2018-06-22Netstack should return EOF on closed read.Brian Geffon
The shutdown behavior where we return EAGAIN for sockets which are non-blocking is only correct for packet based sockets. SOCK_STREAM sockets should return EOF. PiperOrigin-RevId: 201703055 Change-Id: I20b25ceca7286c37766936475855959706fc5397
2018-06-21netstack: tcp socket connected state S/R support.Zhaozhong Ni
PiperOrigin-RevId: 201596247 Change-Id: Id22f47b2cdcbe14aa0d930f7807ba75f91a56724
2018-06-21Drop return from SendExternalSignalMichael Pratt
SendExternalSignal is no longer called before CreateProcess, so it can enforce this simplified precondition. StartForwarding, and after Kernel.Start. PiperOrigin-RevId: 201591170 Change-Id: Ib7022ef7895612d7d82a00942ab59fa433c4d6e9
2018-06-21Forward SIGUSR2 to the sandbox tooFabricio Voznika
SIGUSR2 was being masked out to be used as a way to dump sentry stacks. This could cause compatibility problems in cases anyone uses SIGUSR2 to communicate with the container init process. PiperOrigin-RevId: 201575374 Change-Id: I312246e828f38ad059139bb45b8addc2ed055d74
2018-06-21Implement ioctl(FIOASYNC)Ian Gudger
FIOASYNC and friends are used to send signals when a file is ready for IO. This may or may not be needed by Nginx. While Nginx does use it, it is unclear if the code that uses it has any effect. PiperOrigin-RevId: 201550828 Change-Id: I7ba05a7db4eb2dfffde11e9bd9a35b65b98d7f50
2018-06-20Remove some defers in hot paths in the filesystem code.Nicolas Lacasse
PiperOrigin-RevId: 201401727 Change-Id: Ia5589882ba58a00efb522ab372e206b7e8e62aee
2018-06-20sentry: pending signals S/R optimization.Zhaozhong Ni
Almost all of the hundreds of pending signal queues are empty upon save. PiperOrigin-RevId: 201380318 Change-Id: I40747072435299de681d646e0862efac0637e172
2018-06-19Epsocket has incorrect recv(2) behavior after SHUT_RD.Brian Geffon
After shutdown(SHUT_RD) calls to recv /w MSG_DONTWAIT or with O_NONBLOCK should result in a EAGAIN and not 0. Blocking sockets should return 0 as they would have otherwise blocked indefinitely. PiperOrigin-RevId: 201271123 Change-Id: If589b69c17fa5b9ff05bcf9e44024da9588c8876
2018-06-19Make KVM more scalable by removing CPU cap.Adin Scannell
Instead, CPUs will be created dynamically. We also allow a relatively efficient mechanism for stealing and notifying when a vCPU becomes available via unlock. Since the number of vCPUs is no longer fixed at machine creation time, we make the dirtySet packing more efficient. This has the pleasant side effect of cutting out the unsafe address space code. PiperOrigin-RevId: 201266691 Change-Id: I275c73525a4f38e3714b9ac0fd88731c26adfe66
2018-06-19sentry: futex S/R optimization.Zhaozhong Ni
No need to save thousands of zerovalue buckets. PiperOrigin-RevId: 201258598 Change-Id: I5d3ea7b6a5345117ab4f610332d5288ca550be33
2018-06-19Added a resume command to unpause a paused container.Justine Olshan
Resume checks the status of the container and unpauses the kernel if its status is paused. Otherwise nothing happens. Tests were added to ensure that the process is in the correct state after various commands. PiperOrigin-RevId: 201251234 Change-Id: Ifd11b336c33b654fea6238738f864fcf2bf81e19
2018-06-19Rpcinet is racy around shutdown flags.Brian Geffon
Correct a data race in rpcinet where a shutdown and recvmsg can race around shutown flags. PiperOrigin-RevId: 201238366 Change-Id: I5eb06df4a2b4eba331eeb5de19076213081d581f
2018-06-19Add a new cache policy FSCACHE_WRITETHROUGH.Nicolas Lacasse
The new policy is identical to FSCACHE (which caches everything in memory), but it also flushes writes to the backing fs agent immediately. All gofer cache policy decisions have been moved into the cachePolicy type. Previously they were sprinkled around the codebase. There are many different things that we cache (page cache, negative dirents, dirent LRU, unstable attrs, readdir results....), and I don't think we should have individual flags to control each of these. Instead, we should have a few high-level cache policies that are consistent and useful to users. This refactoring makes it easy to add more such policies. PiperOrigin-RevId: 201206937 Change-Id: I6e225c382b2e5e1b0ad4ccf8ca229873f4cd389d
2018-06-19Rpcinet needs to track shutdown state for blocking sockets.Brian Geffon
Because rpcinet will emulate a blocking socket backed by an rpc based non-blocking socket. In the event of a shutdown(SHUT_RD) followed by a read a non-blocking socket is allowed to return an EWOULDBLOCK however since a blocking socket knows it cannot receive anymore data it would block indefinitely and in this situation linux returns 0. We have to track this on the rpcinet sentry side so we can emulate that behavior because the remote side has no way to know if the socket is actually blocking within the sentry. PiperOrigin-RevId: 201201618 Change-Id: I4ac3a7b74b5dae471ab97c2e7d33b83f425aedac
2018-06-17Add rpcinet support for control messages.Brian Geffon
Add support for control messages, but at this time the only control message that the sentry will support here is SO_TIMESTAMP. PiperOrigin-RevId: 200922230 Change-Id: I63a852d9305255625d9df1d989bd46a66e93c446
2018-06-15Replace crypto/rand with internal rand packageMichael Pratt
PiperOrigin-RevId: 200784607 Change-Id: I39aa6ee632936dcbb00fc298adccffa606e9f4c0
2018-06-15sentry: do not start delivering external signal immediately.Zhaozhong Ni
PiperOrigin-RevId: 200765756 Change-Id: Ie4266f32e4e977df3925eb29f3fbb756e0337606
2018-06-15FIFOs should support O_TRUNC as a no-op.Brian Geffon
PiperOrigin-RevId: 200759323 Change-Id: I683b2edcc2188304c4ca563e46af457e23625905
2018-06-15Use notify explicitly on unlock path.Adin Scannell
There are circumstances under which the redpill call will not generate the appropriate action and notification. Replace this call with an explicit notification, which is guaranteed to transition as well as perform the futex wake. PiperOrigin-RevId: 200726934 Change-Id: Ie19e008a6007692dd7335a31a8b59f0af6e54aaa
2018-06-15Implement /proc/thread-selfFabricio Voznika
Closes #68 PiperOrigin-RevId: 200725401 Change-Id: I4827009b8aee89d22887c3af67291ccf7058d420
2018-06-14Ignore expiration count in kernelCPUClockListener.Notify.Jamie Liu
PiperOrigin-RevId: 200590832 Change-Id: I35b817ecccc9414a742dee4815dfc67d0c7d0496
2018-06-13Fix reference leak in VDSO validationIan Gudger
PiperOrigin-RevId: 200496070 Change-Id: I33adb717c44e5b4bcadece882be3ab1ee3920556
2018-06-13Fix missing returns in rpcinet.Brian Geffon
PiperOrigin-RevId: 200472634 Change-Id: I3f0fb9e3b2f8616e6aa1569188258f330bf1ed31
2018-06-13Deflake kvm_test.Adin Scannell
PiperOrigin-RevId: 200439846 Change-Id: I9970fe0716cb02f0f41b754891d55db7e0729f56
2018-06-13Fix failure to mount volume that sandbox process has no accessFabricio Voznika
Boot loader tries to stat mount to determine whether it's a file or not. This may file if the sandbox process doesn't have access to the file. Instead, add overlay on top of file, which is better anyway since we don't want to propagate changes to the host. PiperOrigin-RevId: 200411261 Change-Id: I14222410e8bc00ed037b779a1883d503843ffebb
2018-06-13sentry: do not treat all save errors as state file errors.Zhaozhong Ni
PiperOrigin-RevId: 200410220 Change-Id: I6a8745e33be949e335719083501f18b24f6ba471
2018-06-13Log filemem state when panicing due to invalid refcount.Jamie Liu
PiperOrigin-RevId: 200408305 Change-Id: I676ee49ec77697105723577928c7f82088cd378e
2018-06-12Fix reference leak for negative direntsIan Gudger
PiperOrigin-RevId: 200306715 Change-Id: I7c80059c77ebd3d9a5d7d48b05c8e7a597f10850
2018-06-12Rpcinet doensn't handle SO_RCVTIMEO properly.Brian Geffon
Rpcinet already inherits socket.ReceiveTimeout; however, it's never set on setsockopt(2). The value is currently forwarded as an RPC and ignored as all sockets will be non-blocking on the RPC side. PiperOrigin-RevId: 200299260 Change-Id: I6c610ea22c808ff6420c63759dccfaeab17959dd
2018-06-12Runsc checkpoint works.Brielle Broder
This is the first iteration of checkpoint that actually saves to a file. Tests for checkpoint are included. Ran into an issue when private unix sockets are enabled. An error message was added for this case and the mutex state was set. PiperOrigin-RevId: 200269470 Change-Id: I28d29a9f92c44bf73dc4a4b12ae0509ee4070e93
2018-06-12Drop MMapOpts.MappingIdentity reference in loader.mapSegment.Jamie Liu
PiperOrigin-RevId: 200261995 Change-Id: I7e460b18ceab2c23096bdeb7416159d6e774aaf7
2018-06-11Minor ring0 interface cleanup.Adin Scannell
- Remove unused methods. - Provide declaration for asm function. PiperOrigin-RevId: 200146850 Change-Id: Ic455c96ffe0d2e78ef15f824eb65d7de705b054a
2018-06-11Make page tables split-safe.Adin Scannell
In order to minimize the likelihood of exit during page table modifications, make the full set of page table functions split-safe. This is not strictly necessary (and you may still incur splits due to allocations from the allocator pool) but should make retries a very rare occurance. PiperOrigin-RevId: 200146688 Change-Id: I8fa36aa16b807beda2f0b057be60038258e8d597
2018-06-11Handle all exception vectors.Adin Scannell
PiperOrigin-RevId: 200144655 Change-Id: I5a753c74b75007b7714d6fe34aa0d2e845dc5c41
2018-06-11Set CLOEXEC option to socketsFabricio Voznika
hostinet/socket.go: the Sentry doesn't spawn new processes, but it doesn't hurt to protect the socket from leaking. unet/unet.go: should be setting closing on exec. The FD is explicitly donated to children when needed. PiperOrigin-RevId: 200135682 Change-Id: Ia8a45ced1e00a19420c8611b12e7a8ee770f89cb
2018-06-11Rpcinet is incorrectly handling MSG_TRUNC with SOCK_STREAMBrian Geffon
SOCK_STREAM has special behavior with respect to MSG_TRUNC. Specifically, the data isn't actually copied back out to userspace when MSG_TRUNC is provided on a SOCK_STREAM. According to tcp(7): "Since version 2.4, Linux supports the use of MSG_TRUNC in the flags argument of recv(2) (and recvmsg(2)). This flag causes the received bytes of data to be discarded, rather than passed back in a caller-supplied buffer." PiperOrigin-RevId: 200134860 Change-Id: I70f17a5f60ffe7794c3f0cfafd131c069202e90d
2018-06-11rpcinet is treating EAGAIN and EWOULDBLOCK as different errnos.Brian Geffon
PiperOrigin-RevId: 200124614 Change-Id: I38a7b083f1464a2a586fe24db648e624c455fec5
2018-06-11Add O_TRUNC handling in openatFabricio Voznika
PiperOrigin-RevId: 200103677 Change-Id: I3efb565c30c64d35f8fd7b5c05ed78dcc2990c51
2018-06-11Sentry: split tty.queue into its own file.Kevin Krakauer
Minor refactor. line_discipline.go was home to 2 large structs (lineDiscipline and queue), and queue is now large enough IMO to get its own file. Also moves queue locks into the queue struct, making locking simpler. PiperOrigin-RevId: 200080301 Change-Id: Ia75a0e9b3d9ac8d7e5a0f0099a54e1f5b8bdea34
2018-06-08Fix kernel flags handling and add missing vectors.Adin Scannell
PiperOrigin-RevId: 199877174 Change-Id: I9d19ea301608c2b989df0a6123abb1e779427853
2018-06-08Add checks for short CopyOut in rpcinetBrian Geffon
PiperOrigin-RevId: 199864753 Change-Id: Ibace6a1fdf99ee6ce368ac12c390aa8a02dbdfb7
2018-06-08Fix sigaltstack semantics.Adin Scannell
Walking off the bottom of the sigaltstack, for example with recursive faults, results in forced signal delivery, not resetting the stack or pushing signal stack to whatever happens to lie below the signal stack. PiperOrigin-RevId: 199856085 Change-Id: I0004d2523f0df35d18714de2685b3eaa147837e0
2018-06-08rpcinet is not correctly handling MSG_TRUNC on recvmsg(2).Brian Geffon
MSG_TRUNC can cause recvmsg(2) to return a value larger than the buffer size. In this situation it's an indication that the buffer was completely filled and that the msg was truncated. Previously in rpcinet we were returning the buffer size but we should actually be returning the payload length as returned by the syscall. PiperOrigin-RevId: 199814221 Change-Id: If09aa364219c1bf193603896fcc0dc5c55e85d21
2018-06-07rpcinet should not block in read(2) rpcs.Brian Geffon
PiperOrigin-RevId: 199703609 Change-Id: I8153b0396b22a230a68d4b69c46652a5545f7630
2018-06-07Add missing rpcinet ioctls.Brian Geffon
PiperOrigin-RevId: 199669120 Change-Id: I0be88cdbba29760f967e9a5bb4144ca62c1ed7aa
2018-06-07Sentry: very basic terminal echo support.Kevin Krakauer
Adds support for echo to terminals. Echoing is just copying input back out to the user, e.g. when I type "foo" into a terminal, I expect "foo" to be echoed back to my terminal. Also makes the transform function part of the queue, eliminating the need to pass them around together and the possibility of using the wrong transform for a queue. PiperOrigin-RevId: 199655147 Change-Id: I37c490d4fc1ee91da20ae58ba1f884a5c14fd0d8
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