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PiperOrigin-RevId: 329564614
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As documented for gofer.dentry.hostFD.
PiperOrigin-RevId: 329372319
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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
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This mainly involved enabling kernfs' client filesystems to provide a
StatFS implementation.
Fixes #3411, #3515.
PiperOrigin-RevId: 329009864
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PiperOrigin-RevId: 328843560
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PiperOrigin-RevId: 328583461
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This is needed to support the overlay opaque attribute.
PiperOrigin-RevId: 328552985
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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
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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
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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
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PiperOrigin-RevId: 328415633
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PiperOrigin-RevId: 328410065
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Fixes several java runtime tests:
java/nio/channels/FileChannel/directio/ReadDirect.java
java/nio/channels/FileChannel/directio/PreadDirect.java
Updates #3576.
PiperOrigin-RevId: 328281849
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This is closer to indistinguishable from VFS1 behavior.
PiperOrigin-RevId: 328256068
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We now allow hard links to be created within gofer fs (see
github.com/google/gvisor/commit/f20e63e31b56784c596897e86f03441f9d05f567).
Update the inotify documentation accordingly.
PiperOrigin-RevId: 328177485
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verity GetFilesystem is implemented by mounting the underlying file
system, save the mount, and store both the underlying root dentry and
root Merkle file dentry in verity's root dentry.
PiperOrigin-RevId: 327959334
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- Remove comment about GenericDirectoryFD not being compatible with
dynamic directories. It is currently being used to implement dynamic
directories.
- Try to handle SEEK_END better than setting the offset to
infinity. SEEK_END is poorly defined for dynamic directories
anyways, so at least try make it work correctly for the static
entries.
Updates #1193.
PiperOrigin-RevId: 327890128
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Some VFS operations (those which operate on FDs) get their credentials via the
context instead of via an explicit creds param. For these cases, we must pass
the overlay credentials on the context.
PiperOrigin-RevId: 327881259
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This lets us create "synthetic" mountpoint directories in ReadOnly mounts
during VFS setup.
Also add context.WithMountNamespace, as some filesystems (like overlay) require
a MountNamespace on ctx to handle vfs.Filesystem Operations.
PiperOrigin-RevId: 327874971
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It was not properly creating recursive directories. Added tests for this case.
Updates #1196
PiperOrigin-RevId: 327850811
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Includes a minor refactor for inode construction.
Updates #1486.
PiperOrigin-RevId: 327694933
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Our "Preconditions:" blocks are very useful to determine the input invariants,
but they are bit inconsistent throughout the codebase, which makes them harder
to read (particularly cases with 5+ conditions in a single paragraph).
I've reformatted all of the cases to fit in simple rules:
1. Cases with a single condition are placed on a single line.
2. Cases with multiple conditions are placed in a bulleted list.
This format has been added to the style guide.
I've also mentioned "Postconditions:", though those are much less frequently
used, and all uses already match this style.
PiperOrigin-RevId: 327687465
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Replace mknod call with mknodat equivalent to protect
against symlink attacks. Also added Mknod tests.
Remove goferfs reliance on gofer to check for file
existence before creating a synthetic entry.
Updates #2923
PiperOrigin-RevId: 327544516
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Some character and block devices can be seekable. So allow their FD to maintain
file offset.
PiperOrigin-RevId: 327370684
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This interface method is unneeded.
PiperOrigin-RevId: 327370325
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This is needed to avoid circular dependencies between the vfs and kernel
packages.
PiperOrigin-RevId: 327355524
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Updates #1035
PiperOrigin-RevId: 327351475
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Fixes #3243, #3521
PiperOrigin-RevId: 327308890
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Updates #1035
PiperOrigin-RevId: 327253907
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PiperOrigin-RevId: 327123477
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Fixes python runtime test test_glob.
Updates #3515
We were checking is the to-be-opened dentry is a dir or not before resolving
symlinks. We should check that after resolving symlinks.
This was preventing us from opening a symlink which pointed to a directory
with O_DIRECTORY.
Also added this check in tmpfs and removed a duplicate check.
PiperOrigin-RevId: 327085895
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Fixes php runtime test ext/standard/tests/file/readfile_basic.phpt
Fixes #3516
fsgofers only want the access mode in the OpenFlags passed to Create(). If more
flags are supplied (like O_APPEND in this case), read/write from that fd will
fail with EBADF. See runsc/fsgofer/fsgofer.go:WriteAt()
VFS2 was providing more than just access modes. So filtering the flags using
p9.OpenFlagsModeMask == linux.O_ACCMODE fixes the issue.
Gofer in VFS1 also only extracts the access mode flags while making the create
RPC. See pkg/sentry/fs/gofer/path.go:Create()
Even in VFS2, when we open a handle, we extract out only the access mode flags
+ O_TRUNC.
See third_party/gvisor/pkg/sentry/fsimpl/gofer/handle.go:openHandle()
Added a test for this.
PiperOrigin-RevId: 326574829
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Updates #1486.
PiperOrigin-RevId: 326354750
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Fixes php test ext/standard/tests/file/touch_variation5.phpt on vfs2.
Updates #3516
Also spotted a bug with O_EXCL, where we did not return EEXIST when we tried
to open the root of the filesystem with O_EXCL | O_CREAT.
Added some more tests for open() corner cases.
PiperOrigin-RevId: 326346863
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PiperOrigin-RevId: 326313858
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Fixes #2923
PiperOrigin-RevId: 326296589
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FUSE_GETATTR is called when a stat(2), fstat(2), or lstat(2) is issued
from VFS2 layer to a FUSE filesystem.
Fixes #3175
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Earlier we were using NLink to decide if /tmp is empty or not. However, NLink
at best tells us about the number of subdirectories (via the ".." entries).
NLink = n + 2 for n subdirectories. But it does not tell us if the directory is
empty. There still might be non-directory files. We could also not rely on
NLink because host overlayfs always returned 1.
VFS1 uses Readdir to decide if the directory is empty. Used a similar approach.
We now use IterDirents to decide if the "/tmp" directory is empty.
Fixes #3369
PiperOrigin-RevId: 325554234
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PiperOrigin-RevId: 325546629
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PiperOrigin-RevId: 325531657
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PiperOrigin-RevId: 325490674
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PiperOrigin-RevId: 325388385
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Updates #1198
PiperOrigin-RevId: 325350818
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/proc/sys/net/ipv4/tcp_recovery is used to enable RACK loss
recovery in TCP.
PiperOrigin-RevId: 325157807
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When a directory is replaced by a rename operation, its link count should
reach zero. We were missing the link from `dir/.`
PiperOrigin-RevId: 325141730
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This was discovered by syzkaller.
PiperOrigin-RevId: 325025193
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Go compiler barely inlines anything, so inline by hand
pwriteLocked since it's called from a single place.
PiperOrigin-RevId: 324937734
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PiperOrigin-RevId: 324931854
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The utility has several differences from the VFS1 equivalent:
- There are no weak references, which have a significant overhead
- In order to print useful debug messages with the type of the reference-
counted object, we use a generic Refs object with the owner type as a
template parameter. In vfs1, this was accomplished by storing a type name
and caller stack directly in the ref count (as in vfs1), which increases the
struct size by 6x. (Note that the caller stack was needed because fs types
like Dirent were shared by all fs implementations; in vfs2, each impl has
its own data structures, so this is no longer necessary.)
As an example, the utility is added to tmpfs.inode.
Updates #1486.
PiperOrigin-RevId: 324906582
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PiperOrigin-RevId: 324826968
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