- When setting up the virtual filesystem, mount a host.filesystem to contain
all files that need to be imported.
- Make read/preadv syscalls to the host in cases where preadv2 may not be
supported yet (likewise for writing).
- Make save/restore functions in kernel/kernel.go return early if vfs2 is
enabled.
PiperOrigin-RevId: 300922353
- Make oomScoreAdj a ThreadGroup field (Linux: signal_struct::oom_score_adj).
- Avoid deadlock caused by Task.OOMScoreAdj()/SetOOMScoreAdj() locking Task.mu
and TaskSet.mu in the wrong order (via Task.ExitState()).
PiperOrigin-RevId: 300814698
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 #1965Fixes#2101
PiperOrigin-RevId: 300796067
Go 1.14+ sends SIGURG to Ms to attempt asynchronous preemption of a G. Since it
can't guarantee that a SIGURG is only related to preemption, it continues to
forward them to signal.Notify (see runtime.sighandler).
When runsc is running a container, there are three processes: a parent process
and two children (sandbox and gopher). A parent process sets a signal handler
for all signals and redirect them to the container init process. This logic
should ignore SIGURG signals. We already ignore them in the Sentry, but it will
be better to not notify about them when this is possible.
PiperOrigin-RevId: 300345286
Linux use the task.thread.uw.tp_value field to store the
TLS pointer on arm64 platform, and we use a similar way
in gvisor to store it in the arch/State struct.
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: Ie76b5c6d109bc27ccfd594008a96753806db7764
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
When list elements are removed from a list but not discarded, it becomes
important to invalidate the references they hold to their former
neighbors to prevent memory leaks.
PiperOrigin-RevId: 299412421
Adds an oom_score_adj and oom_score proc file stub. oom_score_adj accepts
writes of values -1000 to 1000 and persists the value with the task. New tasks
inherit the parent's oom_score_adj.
oom_score is a read-only stub that always returns the value '0'.
Issue #202
PiperOrigin-RevId: 299245355
gofer.dentryReadWriter.WriteFromBlocks was not updating
gofer.dentry.size after a write operation that skips the
cache.
Updates #1198
PiperOrigin-RevId: 298708646
The support of PTRACE_SYSEMU on arm64 was added in the 5.3 kernel,
so we can be sure that the current version is higher that 5.3.
And this change moves vsyscall seccomp rules to the arch specific file,
because vsyscall isn't supported on arm64.
PiperOrigin-RevId: 298696493
This is needed for syzkaller to proper classify issues.
Right now, all watchdog issues are duped to one with the
subject "panic: Sentry detected stuck task(s). See stack
trace and message above for more details".
PiperOrigin-RevId: 297975363
/dev/net/tun does not currently work with hostinet. This has caused some
program starts failing because it thinks the feature exists.
PiperOrigin-RevId: 297876196
Enables commands such as:
$ iptables -A INPUT -d 127.0.0.1 -j ACCEPT
$ iptables -t nat -A PREROUTING ! -d 127.0.0.1 -j REDIRECT
Also adds a bunch of REDIRECT+destination tests.
MayDelete must lock the directory also, otherwise concurrent renames may
race. Note that this also changes the methods to be aligned with the actual
Remove and RemoveDirectory methods to minimize confusion when reading the
code. (It was hard to see that resolution was correct.)
PiperOrigin-RevId: 297258304
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Fabricio Voznika
Dean Deng
Jamie Liu
Ting-Yu Wang
Andrei Vagin
Haibo Xu
Tamir Duberstein
Ian Lewis
Nayana Bidari
Michael Pratt
Andrei Vagin
Adin Scannell
Rahat Mahmood
Kevin Krakauer
moricho
Ian Gudger