mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Amir Alavi
9a74334588
Implement kernfs.InodeWithXattrs on cgroup2 directories using in-memory xattr storage. Allow trusted, security, and user namespaces to match Linux kernfs/cgroup2 behavior used by systemd. Add cgroup2 syscall tests for xattr set/get/list/remove and trusted xattr permission checks without CAP_SYS_ADMIN. Fixes google/gvisor#13639 Signed-off-by: Amir Alavi <[email protected]>
68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
// Copyright 2026 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cgroup2fs
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import (
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"strings"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/errors/linuxerr"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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var _ kernfs.InodeWithXattrs = (*cgroup)(nil)
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func cgroup2XattrAllowed(name string) bool {
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return strings.HasPrefix(name, linux.XATTR_TRUSTED_PREFIX) ||
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strings.HasPrefix(name, linux.XATTR_SECURITY_PREFIX) ||
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strings.HasPrefix(name, linux.XATTR_USER_PREFIX)
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}
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// GetXattr implements kernfs.InodeWithXattrs.GetXattr.
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func (c *cgroup) GetXattr(ctx context.Context, opts vfs.GetXattrOptions) (string, error) {
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if !cgroup2XattrAllowed(opts.Name) {
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return "", linuxerr.EOPNOTSUPP
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}
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creds := auth.CredentialsFromContext(ctx)
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return c.xattrs.GetXattr(creds, c.Mode(), c.UID(), &opts)
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}
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// SetXattr implements kernfs.InodeWithXattrs.SetXattr.
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func (c *cgroup) SetXattr(ctx context.Context, opts vfs.SetXattrOptions) error {
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if !cgroup2XattrAllowed(opts.Name) {
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return linuxerr.EOPNOTSUPP
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}
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creds := auth.CredentialsFromContext(ctx)
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return c.xattrs.SetXattr(creds, c.Mode(), c.UID(), c.GID(), &opts)
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}
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// ListXattr implements kernfs.InodeWithXattrs.ListXattr.
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func (c *cgroup) ListXattr(ctx context.Context, size uint64) ([]string, error) {
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creds := auth.CredentialsFromContext(ctx)
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return c.xattrs.ListXattr(creds, size)
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}
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// RemoveXattr implements kernfs.InodeWithXattrs.RemoveXattr.
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func (c *cgroup) RemoveXattr(ctx context.Context, name string) error {
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if !cgroup2XattrAllowed(name) {
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return linuxerr.EOPNOTSUPP
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}
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creds := auth.CredentialsFromContext(ctx)
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return c.xattrs.RemoveXattr(creds, c.Mode(), c.UID(), name)
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}
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