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Updates #1035
PiperOrigin-RevId: 301255357
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Only gofer filesystem was calling vfs.CheckSetStat for
vfs.FilesystemImpl.SetStatAt and vfs.FileDescriptionImpl.SetStat.
Updates #1193, #1672, #1197
PiperOrigin-RevId: 301226522
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Note that the raw faccessat system call does not actually take a flags argument;
according to faccessat(2), the glibc wrapper implements the flags by using
fstatat(2). Remove the flag argument that we try to extract from vfs1, which
would just be a garbage value.
Updates #1965
Fixes #2101
PiperOrigin-RevId: 300796067
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Plumbs MS_NOEXEC and MS_RDONLY. Others are TODO.
Updates #1623 #1193
PiperOrigin-RevId: 300764669
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In VFS2, imported file descriptors are stored in a kernfs-based filesystem.
Upon calling ImportFD, the host fd can be accessed in two ways:
1. a FileDescription that can be added to the FDTable, and
2. a Dentry in the host.filesystem mount, which we will want to access through
magic symlinks in /proc/[pid]/fd/.
An implementation of the kernfs.Inode interface stores a unique host fd. This
inode can be inserted into file descriptions as well as dentries.
This change also plumbs in three FileDescriptionImpls corresponding to fds for
sockets, TTYs, and other files (only the latter is implemented here).
These implementations will mostly make corresponding syscalls to the host.
Where possible, the logic is ported over from pkg/sentry/fs/host.
Updates #1672
PiperOrigin-RevId: 299417263
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Analogous to Linux's kern_mount().
PiperOrigin-RevId: 297259580
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pipe and pipe2 aren't ported, pending a slight rework of pipe FDs for VFS2.
mount and umount2 aren't ported out of temporary laziness. access and faccessat
need additional FSImpl methods to implement properly, but are stubbed to
prevent googletest from CHECK-failing. Other syscalls require additional
plumbing.
Updates #1623
PiperOrigin-RevId: 297188448
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glibc defines struct epoll_event in such a way that epoll_event.data.fd exists.
However, the kernel's definition of struct epoll_event makes epoll_event.data
an opaque uint64, so naming half of it "fd" just introduces confusion. Remove
the Fd field, and make Data a [2]int32 to compensate.
Also add required padding to linux.EpollEvent on ARM64.
PiperOrigin-RevId: 295250424
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This is easier than storing errors from e.g. CopyOut in the callback.
PiperOrigin-RevId: 295230021
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This saves one pointer dereference per VFS access.
Updates #1623
PiperOrigin-RevId: 295216176
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- Added fsbridge package with interface that can be used to open
and read from VFS1 and VFS2 files.
- Converted ELF loader to use fsbridge
- Added VFS2 types to FSContext
- Added vfs.MountNamespace to ThreadGroup
Updates #1623
PiperOrigin-RevId: 295183950
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This allow callers to say whether the file is being
opened to be executed, so that the proper checks can
be done from FilesystemImpl.OpenAt()
Updates #1623
PiperOrigin-RevId: 295042595
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Updates #1035
PiperOrigin-RevId: 293194631
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Add a file lock implementation that can be embedded into various filesystem
implementations.
Updates #1480
PiperOrigin-RevId: 292614758
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Updates #1480
PiperOrigin-RevId: 292180192
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WritableSource is a convenience interface used for files that can
be written to, e.g. /proc/net/ipv4/tpc_sack. It reads max of 4KB
and only from offset 0 which should cover most cases. It can be
extended as neeed.
Updates #1195
PiperOrigin-RevId: 292056924
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PiperOrigin-RevId: 291997879
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PiperOrigin-RevId: 291986033
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Because the abi will depend on the core types for marshalling (usermem,
context, safemem, safecopy), these need to be flattened from the sentry
directory. These packages contain no sentry-specific details.
PiperOrigin-RevId: 291811289
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PiperOrigin-RevId: 291745021
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Note that in VFS2, filesystem device numbers are per-vfs.FilesystemImpl rather
than global, avoiding the need for a "registry" type to handle save/restore.
(This is more consistent with Linux anyway: compare e.g.
mm/shmem.c:shmem_mount() => fs/super.c:mount_nodev() => (indirectly)
set_anon_super().)
PiperOrigin-RevId: 291425193
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PiperOrigin-RevId: 291006713
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Files not implemented require VFSv2 plumbing into the kernel.
Also, cgroup is not implemented yet.
Updates #1195
PiperOrigin-RevId: 290129176
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* Rename syncutil to sync.
* Add aliases to sync types.
* Replace existing usage of standard library sync package.
This will make it easier to swap out synchronization primitives. For example,
this will allow us to use primitives from github.com/sasha-s/go-deadlock to
check for lock ordering violations.
Updates #1472
PiperOrigin-RevId: 289033387
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