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Don't return the filename, since it can already be determined by the caller.
This was causing a panic in RenameAt, which relied on the name to be nonempty
even if the error was EEXIST.
Reported-by: syzbot+e9f117d000301e42361f@syzkaller.appspotmail.com
PiperOrigin-RevId: 340381946
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Send NUD probes in another gorountine to free the thread of execution for
finishing the state transition. This is necessary to avoid deadlock where
sending and processing probes are done in the same call stack, such as loopback
and integration tests.
Fixes #4701
PiperOrigin-RevId: 340362481
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PiperOrigin-RevId: 340361998
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PiperOrigin-RevId: 340275942
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PiperOrigin-RevId: 340274194
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PiperOrigin-RevId: 340149214
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In the docker container, the ipv6 loopback address is not set,
and connect("::1") has to return ENEADDRNOTAVAIL in this case.
Without this fix, it returns EHOSTUNREACH.
PiperOrigin-RevId: 340002915
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Read-only directories (e.g. under /sys, /proc) should return EPERM for rename.
PiperOrigin-RevId: 339979022
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The non-errno error was causing panics before.
PiperOrigin-RevId: 339969348
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PiperOrigin-RevId: 339945377
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kernel.copyContext{t} cannot be used outside of t's task goroutine, for three
reasons:
- t.CopyScratchBuffer() is task-goroutine-local.
- Calling t.MemoryManager() without running on t's task goroutine or locking
t.mu violates t.MemoryManager()'s preconditions.
- kernel.copyContext passes t as context.Context to MM IO methods, which is
illegal outside of t's task goroutine (cf. kernel.Task.Value()).
Fix this by splitting AsCopyContext() into CopyContext() (which takes an
explicit context.Context and is usable outside of the task goroutine) and
OwnCopyContext() (which uses t as context.Context, but is only usable by t's
task goroutine).
PiperOrigin-RevId: 339933809
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PiperOrigin-RevId: 339921446
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PiperOrigin-RevId: 339750876
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Fixes #4613.
PiperOrigin-RevId: 339746784
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TCP endpoint unconditionly binds to v4 even when the stack only supports v6.
PiperOrigin-RevId: 339739392
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PiperOrigin-RevId: 339721152
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Refactor TCP handshake code so that when connect is initiated, the initial SYN
is sent before creating a goroutine to handle the rest of the handshake (which
blocks). Similarly, the initial SYN-ACK is sent inline when SYN is received
during accept.
Some additional cleanup is done as well.
Eventually we would like to complete connections in the dispatcher without
requiring a wakeup to complete the handshake. This refactor makes that easier.
Updates #231
PiperOrigin-RevId: 339675182
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Updates #1486.
PiperOrigin-RevId: 339581879
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Also refactor the template and CheckedObject interface to make this cleaner.
Updates #1486.
PiperOrigin-RevId: 339577120
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PiperOrigin-RevId: 339540747
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Updates #1199
PiperOrigin-RevId: 339528827
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Use the stack clock instead. Change NeighborEntry.UpdatedAt to
UpdatedAtNanos.
PiperOrigin-RevId: 339520566
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PiperOrigin-RevId: 339505487
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PiperOrigin-RevId: 339404936
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Signed-off-by: Min Le <lemin.lm@antgroup.com>
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IPv4 options extend the size of the IP header and have a basic known
format. The framework can process that format without needing to know
about every possible option. We can add more code to handle additional
option types as we need them. Bad options or mangled option entries
can result in ICMP Parameter Problem packets. The first types we
support are the Timestamp option and the Record Route option, included
in this change.
The options are processed at several points in the packet flow within
the Network stack, with slightly different requirements. The framework
includes a mechanism to control this at each point. Support has been
added for such points which are only present in upcoming CLs such as
during packet forwarding and fragmentation.
With this change, 'ping -R' and 'ping -T' work against gVisor and Fuchsia.
$ ping -R 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(124) bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.990 ms
NOP
RR: 192.168.1.1
192.168.1.2
192.168.1.1
$ ping -T tsprespec 192.168.1.2 192.168.1.1 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(124) bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=1.20 ms
TS: 192.168.1.2 71486821 absolute
192.168.1.1 746
Unit tests included for generic options, Timestamp options
and Record Route options.
PiperOrigin-RevId: 339379076
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PiperOrigin-RevId: 339377254
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This change wakes up any waiters when we receive an ICMP port unreachable
control packet on an UDP socket as well as sets waiter.EventErr in
the result returned by Readiness() when e.lastError is not nil.
The latter is required where an epoll()/poll() is done after the error
is already handled since we will never notify again in such cases.
PiperOrigin-RevId: 339370469
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This PR implements /proc/[pid]/mem for `pkg/sentry/fs` (refer to #2716) and `pkg/sentry/fsimpl`.
@majek
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/4060 from lnsp:proc-pid-mem 2caf9021254646f441be618a9bb5528610e44d43
PiperOrigin-RevId: 339369629
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...instead of passing its fields piecemeal.
PiperOrigin-RevId: 339345899
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In VFS1's overlayfs, files use the device and inode number of the lower layer
inode if one exists, and the upper layer inode otherwise. The former behavior
is inefficient (requiring lower layer lookups even if the file exists and is
otherwise wholly determined by the upper layer), and somewhat dangerous if the
lower layer is also observable (since both the overlay and lower layer file
will have the same device and inode numbers and thus appear to be the same
file, despite being behaviorally different). VFS2 overlayfs imitates Linux
overlayfs (in its default configuration) instead; it always uses the inode
number from the originating layer, but synthesizes a unique device number for
directories and another device number for non-directory files that have not
been copied-up.
As it turns out, the latter is insufficient (in VFS2, and possibly Linux as
well), because a given layer may include files with different device numbers.
If two distinct files on such a layer have device number X and Y respectively,
but share inode number Z, then the overlay will map both files to some private
device number X' and inode number Z, potentially confusing applications. Fix
this by assigning synthetic device numbers based on the lower layer's device
number, rather than the lower layer's vfs.Filesystem.
PiperOrigin-RevId: 339300341
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Updates #3921
PiperOrigin-RevId: 339195417
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PiperOrigin-RevId: 339166854
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Also change verity test to use a context with an active task. This is
required to delete/rename the file in the underlying file system.
PiperOrigin-RevId: 339146445
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Much like the VFS2 gofer client, kernfs too now caches dentries. The size of the
LRU cache is configurable via mount options.
Have adopted the same reference semantics from gofer client dentry.
Only sysfs and procfs use this LRU cache. The rest of the kernfs users (devpts,
fusefs, host, pipefs, sockfs) still use the no cache approach.
PiperOrigin-RevId: 339139835
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Control messages collected when peeking into a socket were being leaked.
PiperOrigin-RevId: 339114961
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PiperOrigin-RevId: 338847417
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Updates #1486.
PiperOrigin-RevId: 338832085
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Fixes #4427, #4428
PiperOrigin-RevId: 338805047
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PiperOrigin-RevId: 338798433
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PiperOrigin-RevId: 338784921
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Inode number consistency checks are now skipped in save/restore tests for
reasons described in greatest detail in StatTest.StateDoesntChangeAfterRename.
They pass in VFS1 due to the bug described in new test case
SimpleStatTest.DifferentFilesHaveDifferentDeviceInodeNumberPairs.
Fixes #1663
PiperOrigin-RevId: 338776148
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PiperOrigin-RevId: 338756277
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PiperOrigin-RevId: 338728070
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- When encodeState.resolve() determines that the resolved reflect.Value is
contained by a previously-resolved object, set wire.Ref.Type to the
containing object's type (existing.obj.Type()) rather than the contained
value's type (obj.Type()).
- When encodeState.resolve() determines that the resolved reflect.Value
contains a previously-resolved object, handle cases where the new object
contains *multiple* previously-resolved objects. (This may cause
previously-allocated object IDs to become unused; to facilitate this, change
encodeState.pending to a map, and change the wire format to prefix each
object with its object ID.)
- Add encodeState.encodedStructs to avoid redundant encoding of structs, since
deduplication of objects via encodeState.resolve() doesn't work for objects
instantiated by StateSave() and passed to SaveValue() (i.e. fields tagged
`state:".(whatever)"`).
- Make unexported array fields deserializable via slices that refer to them by
casting away their unexportedness in decodeState.decodeObject().
Updates #1663
PiperOrigin-RevId: 338727687
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Wait an additional RetransmitTimer duration after the last probe before
transitioning to Failed. The previous implementation transitions immediately to
Failed after sending the last probe, which is erroneous behavior.
PiperOrigin-RevId: 338723794
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Read is implemented by PRead, with offset obtained from Seek.
PiperOrigin-RevId: 338718587
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Added the following fields in kernfs.InodeAttr:
- blockSize
- atime
- mtime
- ctime
Also resolved all TODOs for #1193.
Fixes #1193
PiperOrigin-RevId: 338714527
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Drain the notification channel after first accept as in case the first accept
never blocked then the notification for the first accept will still be in the
channel causing the second accept to fail as it will try to wait on the channel
and return immediately due to the older notification even though there is no
connection yet in the accept queue.
PiperOrigin-RevId: 338710062
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Even if the child dentry has been cached, we should still check whether
the file and the corresponding Merkle tree file exist as expected. This
ensures that we can detect deletion/renaming of files that have been
previous enabled and opened.
Also make all verification failures to return EIO. This helps to test
verify failures.
PiperOrigin-RevId: 338709055
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