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PiperOrigin-RevId: 332097286
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PRead is implemented by read from the underlying file in blocks, and
verify each block. The verified contents are saved into the output
buffer.
PiperOrigin-RevId: 332092267
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PiperOrigin-RevId: 332069743
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CopyContext is a better name for the interface because from
go-marshal's perspective, the interface has nothing to do with a
task. A kernel.Task happens to implement the interface, but so can
other things like MemoryManager and IO sequences.
PiperOrigin-RevId: 331959678
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PiperOrigin-RevId: 331940975
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OCI configuration includes support for specifying seccomp filters. In runc,
these filter configurations are converted into seccomp BPF programs and loaded
into the kernel via libseccomp. runsc needs to be a static binary so, for
runsc, we cannot rely on a C library and need to implement the functionality
in Go.
The generator added here implements basic support for taking OCI seccomp
configuration and converting it into a seccomp BPF program with the same
behavior as a program generated by libseccomp.
- New conditional operations were added to pkg/seccomp to support operations
available in OCI.
- AllowAny and AllowValue were renamed to MatchAny and EqualTo to better reflect
that syscalls matching the conditionals result in the provided action not
simply SCMP_RET_ALLOW.
- BuildProgram in pkg/seccomp no longer panics if provided an empty list of
rules. It now builds a program with the architecture sanity check only.
- ProgramBuilder now allows adding labels that are unused. However, backwards
jumps are still not permitted.
Fixes #510
PiperOrigin-RevId: 331938697
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PiperOrigin-RevId: 331905347
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Make setting STATX_SIZE a no-op, if it is valid for the given permissions and
file type.
Also update proc tests, which were overfitted before.
Fixes #3842.
Updates #1193.
PiperOrigin-RevId: 331861087
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This is needed for SO_LINGER, where close() is blocked for linger timeout and
we are holding the FDTable lock for the entire timeout which will not allow
us to create/delete other fds. We have to release the locks and then drop the
fds.
PiperOrigin-RevId: 331844185
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Discovered by ayushranjan@:
VFS2 was employing the following algorithm for fetching ready events from an
epoll instance:
- Create a statically sized EpollEvent slice on the stack of size 16.
- Pass that to EpollInstance.ReadEvents() to populate.
- EpollInstance.ReadEvents() requeues level-triggered events that it returns
back into the ready queue.
- Write the results to usermem.
- If the number of results were = 16 then recall EpollInstance.ReadEvents() in
the hopes of getting more. But this will cause duplication of the "requeued"
ready level-triggered events.
So if the ready queue has >= 16 ready events, the EpollWait for loop will spin
until it fills the usermem with `maxEvents` events.
Fixes #3521
PiperOrigin-RevId: 331840527
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PiperOrigin-RevId: 331824411
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Currently the returned offset is an index, and we can't
use it to find the next fd to serialize, because getdents
should iterate correctly despite mutation of fds. Instead,
we can return the next fd to serialize plus 2 (which
accounts for "." and "..") as the offset.
Fixes: #3894
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
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PiperOrigin-RevId: 331648296
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In Linux, FDSize is fs/proc/array.c:task_state() => struct fdtable::max_fds,
which is set to the underlying array's length in fs/file.c:alloc_fdtable().
Follow-up changes:
- Remove FDTable.GetRefs() and FDTable.GetRefsVFS2(), which are unused.
- Reset FDTable.used to 0 during restore, since the subsequent calls to
FDTable.setAll() increment it again, causing its value to be doubled. (After
this CL, FDTable.used is only used to avoid reallocation in FDTable.GetFDs(),
so this fix is not very visible.)
PiperOrigin-RevId: 331588190
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PiperOrigin-RevId: 331256608
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Fixes #3696
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