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-rw-r--r--pkg/sentry/fsimpl/devpts/devpts.go5
-rw-r--r--pkg/sentry/fsimpl/ext/filesystem.go5
-rw-r--r--pkg/sentry/fsimpl/fuse/fusefs.go10
-rw-r--r--pkg/sentry/fsimpl/gofer/filesystem.go57
-rw-r--r--pkg/sentry/fsimpl/gofer/gofer.go110
-rw-r--r--pkg/sentry/fsimpl/host/host.go5
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs_test.go5
-rw-r--r--pkg/sentry/fsimpl/overlay/filesystem.go12
-rw-r--r--pkg/sentry/fsimpl/pipefs/pipefs.go5
-rw-r--r--pkg/sentry/fsimpl/proc/filesystem.go5
-rw-r--r--pkg/sentry/fsimpl/sockfs/sockfs.go5
-rw-r--r--pkg/sentry/fsimpl/sys/sys.go5
-rw-r--r--pkg/sentry/fsimpl/tmpfs/filesystem.go5
-rw-r--r--pkg/sentry/fsimpl/tmpfs/tmpfs.go5
-rw-r--r--pkg/sentry/fsimpl/verity/verity.go5
-rw-r--r--pkg/sentry/vfs/anonfs.go5
-rw-r--r--pkg/sentry/vfs/filesystem.go9
-rw-r--r--pkg/sentry/vfs/mount.go8
18 files changed, 222 insertions, 44 deletions
diff --git a/pkg/sentry/fsimpl/devpts/devpts.go b/pkg/sentry/fsimpl/devpts/devpts.go
index d8c237753..e75954105 100644
--- a/pkg/sentry/fsimpl/devpts/devpts.go
+++ b/pkg/sentry/fsimpl/devpts/devpts.go
@@ -137,6 +137,11 @@ func (fs *filesystem) Release(ctx context.Context) {
fs.Filesystem.Release(ctx)
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
+
// rootInode is the root directory inode for the devpts mounts.
//
// +stateify savable
diff --git a/pkg/sentry/fsimpl/ext/filesystem.go b/pkg/sentry/fsimpl/ext/filesystem.go
index 917f1873d..d4fc484a2 100644
--- a/pkg/sentry/fsimpl/ext/filesystem.go
+++ b/pkg/sentry/fsimpl/ext/filesystem.go
@@ -548,3 +548,8 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
defer fs.mu.RUnlock()
return genericPrependPath(vfsroot, vd.Mount(), vd.Dentry().Impl().(*dentry), b)
}
+
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
diff --git a/pkg/sentry/fsimpl/fuse/fusefs.go b/pkg/sentry/fsimpl/fuse/fusefs.go
index 204d8d143..fb0ba2c6d 100644
--- a/pkg/sentry/fsimpl/fuse/fusefs.go
+++ b/pkg/sentry/fsimpl/fuse/fusefs.go
@@ -47,6 +47,9 @@ type FilesystemType struct{}
// +stateify savable
type filesystemOptions struct {
+ // mopts contains the raw, unparsed mount options passed to this filesystem.
+ mopts string
+
// userID specifies the numeric uid of the mount owner.
// This option should not be specified by the filesystem owner.
// It is set by libfuse (or, if libfuse is not used, must be set
@@ -108,7 +111,7 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
return nil, nil, err
}
- var fsopts filesystemOptions
+ fsopts := filesystemOptions{mopts: opts.Data}
mopts := vfs.GenericParseMountOptions(opts.Data)
deviceDescriptorStr, ok := mopts["fd"]
if !ok {
@@ -260,6 +263,11 @@ func (fs *filesystem) Release(ctx context.Context) {
fs.Filesystem.Release(ctx)
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return fs.opts.mopts
+}
+
// inode implements kernfs.Inode.
//
// +stateify savable
diff --git a/pkg/sentry/fsimpl/gofer/filesystem.go b/pkg/sentry/fsimpl/gofer/filesystem.go
index 8f95473b6..c34451269 100644
--- a/pkg/sentry/fsimpl/gofer/filesystem.go
+++ b/pkg/sentry/fsimpl/gofer/filesystem.go
@@ -15,7 +15,9 @@
package gofer
import (
+ "fmt"
"math"
+ "strings"
"sync"
"sync/atomic"
@@ -1608,3 +1610,58 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
defer fs.renameMu.RUnlock()
return genericPrependPath(vfsroot, vd.Mount(), vd.Dentry().Impl().(*dentry), b)
}
+
+type mopt struct {
+ key string
+ value interface{}
+}
+
+func (m mopt) String() string {
+ if m.value == nil {
+ return fmt.Sprintf("%s", m.key)
+ }
+ return fmt.Sprintf("%s=%v", m.key, m.value)
+}
+
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ optsKV := []mopt{
+ {moptTransport, transportModeFD}, // Only valid value, currently.
+ {moptReadFD, fs.opts.fd}, // Currently, read and write FD are the same.
+ {moptWriteFD, fs.opts.fd}, // Currently, read and write FD are the same.
+ {moptAname, fs.opts.aname},
+ {moptDfltUID, fs.opts.dfltuid},
+ {moptDfltGID, fs.opts.dfltgid},
+ {moptMsize, fs.opts.msize},
+ {moptVersion, fs.opts.version},
+ {moptDentryCacheLimit, fs.opts.maxCachedDentries},
+ }
+
+ switch fs.opts.interop {
+ case InteropModeExclusive:
+ optsKV = append(optsKV, mopt{moptCache, cacheFSCache})
+ case InteropModeWritethrough:
+ optsKV = append(optsKV, mopt{moptCache, cacheFSCacheWritethrough})
+ case InteropModeShared:
+ if fs.opts.regularFilesUseSpecialFileFD {
+ optsKV = append(optsKV, mopt{moptCache, cacheNone})
+ } else {
+ optsKV = append(optsKV, mopt{moptCache, cacheRemoteRevalidating})
+ }
+ }
+ if fs.opts.forcePageCache {
+ optsKV = append(optsKV, mopt{moptForcePageCache, nil})
+ }
+ if fs.opts.limitHostFDTranslation {
+ optsKV = append(optsKV, mopt{moptLimitHostFDTranslation, nil})
+ }
+ if fs.opts.overlayfsStaleRead {
+ optsKV = append(optsKV, mopt{moptOverlayfsStaleRead, nil})
+ }
+
+ opts := make([]string, 0, len(optsKV))
+ for _, opt := range optsKV {
+ opts = append(opts, opt.String())
+ }
+ return strings.Join(opts, ",")
+}
diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go
index 1508cbdf1..71569dc65 100644
--- a/pkg/sentry/fsimpl/gofer/gofer.go
+++ b/pkg/sentry/fsimpl/gofer/gofer.go
@@ -66,6 +66,34 @@ import (
// Name is the default filesystem name.
const Name = "9p"
+// Mount option names for goferfs.
+const (
+ moptTransport = "trans"
+ moptReadFD = "rfdno"
+ moptWriteFD = "wfdno"
+ moptAname = "aname"
+ moptDfltUID = "dfltuid"
+ moptDfltGID = "dfltgid"
+ moptMsize = "msize"
+ moptVersion = "version"
+ moptDentryCacheLimit = "dentry_cache_limit"
+ moptCache = "cache"
+ moptForcePageCache = "force_page_cache"
+ moptLimitHostFDTranslation = "limit_host_fd_translation"
+ moptOverlayfsStaleRead = "overlayfs_stale_read"
+)
+
+// Valid values for the "cache" mount option.
+const (
+ cacheNone = "none"
+ cacheFSCache = "fscache"
+ cacheFSCacheWritethrough = "fscache_writethrough"
+ cacheRemoteRevalidating = "remote_revalidating"
+)
+
+// Valid values for "trans" mount option.
+const transportModeFD = "fd"
+
// FilesystemType implements vfs.FilesystemType.
//
// +stateify savable
@@ -301,39 +329,39 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
// Get the attach name.
fsopts.aname = "/"
- if aname, ok := mopts["aname"]; ok {
- delete(mopts, "aname")
+ if aname, ok := mopts[moptAname]; ok {
+ delete(mopts, moptAname)
fsopts.aname = aname
}
// Parse the cache policy. For historical reasons, this defaults to the
// least generally-applicable option, InteropModeExclusive.
fsopts.interop = InteropModeExclusive
- if cache, ok := mopts["cache"]; ok {
- delete(mopts, "cache")
+ if cache, ok := mopts[moptCache]; ok {
+ delete(mopts, moptCache)
switch cache {
- case "fscache":
+ case cacheFSCache:
fsopts.interop = InteropModeExclusive
- case "fscache_writethrough":
+ case cacheFSCacheWritethrough:
fsopts.interop = InteropModeWritethrough
- case "none":
+ case cacheNone:
fsopts.regularFilesUseSpecialFileFD = true
fallthrough
- case "remote_revalidating":
+ case cacheRemoteRevalidating:
fsopts.interop = InteropModeShared
default:
- ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid cache policy: cache=%s", cache)
+ ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid cache policy: %s=%s", moptCache, cache)
return nil, nil, syserror.EINVAL
}
}
// Parse the default UID and GID.
fsopts.dfltuid = _V9FS_DEFUID
- if dfltuidstr, ok := mopts["dfltuid"]; ok {
- delete(mopts, "dfltuid")
+ if dfltuidstr, ok := mopts[moptDfltUID]; ok {
+ delete(mopts, moptDfltUID)
dfltuid, err := strconv.ParseUint(dfltuidstr, 10, 32)
if err != nil {
- ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid default UID: dfltuid=%s", dfltuidstr)
+ ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid default UID: %s=%s", moptDfltUID, dfltuidstr)
return nil, nil, syserror.EINVAL
}
// In Linux, dfltuid is interpreted as a UID and is converted to a KUID
@@ -342,11 +370,11 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
fsopts.dfltuid = auth.KUID(dfltuid)
}
fsopts.dfltgid = _V9FS_DEFGID
- if dfltgidstr, ok := mopts["dfltgid"]; ok {
- delete(mopts, "dfltgid")
+ if dfltgidstr, ok := mopts[moptDfltGID]; ok {
+ delete(mopts, moptDfltGID)
dfltgid, err := strconv.ParseUint(dfltgidstr, 10, 32)
if err != nil {
- ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid default UID: dfltgid=%s", dfltgidstr)
+ ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid default UID: %s=%s", moptDfltGID, dfltgidstr)
return nil, nil, syserror.EINVAL
}
fsopts.dfltgid = auth.KGID(dfltgid)
@@ -354,11 +382,11 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
// Parse the 9P message size.
fsopts.msize = 1024 * 1024 // 1M, tested to give good enough performance up to 64M
- if msizestr, ok := mopts["msize"]; ok {
- delete(mopts, "msize")
+ if msizestr, ok := mopts[moptMsize]; ok {
+ delete(mopts, moptMsize)
msize, err := strconv.ParseUint(msizestr, 10, 32)
if err != nil {
- ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid message size: msize=%s", msizestr)
+ ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid message size: %s=%s", moptMsize, msizestr)
return nil, nil, syserror.EINVAL
}
fsopts.msize = uint32(msize)
@@ -366,34 +394,34 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
// Parse the 9P protocol version.
fsopts.version = p9.HighestVersionString()
- if version, ok := mopts["version"]; ok {
- delete(mopts, "version")
+ if version, ok := mopts[moptVersion]; ok {
+ delete(mopts, moptVersion)
fsopts.version = version
}
// Parse the dentry cache limit.
fsopts.maxCachedDentries = 1000
- if str, ok := mopts["dentry_cache_limit"]; ok {
- delete(mopts, "dentry_cache_limit")
+ if str, ok := mopts[moptDentryCacheLimit]; ok {
+ delete(mopts, moptDentryCacheLimit)
maxCachedDentries, err := strconv.ParseUint(str, 10, 64)
if err != nil {
- ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid dentry cache limit: dentry_cache_limit=%s", str)
+ ctx.Warningf("gofer.FilesystemType.GetFilesystem: invalid dentry cache limit: %s=%s", moptDentryCacheLimit, str)
return nil, nil, syserror.EINVAL
}
fsopts.maxCachedDentries = maxCachedDentries
}
// Handle simple flags.
- if _, ok := mopts["force_page_cache"]; ok {
- delete(mopts, "force_page_cache")
+ if _, ok := mopts[moptForcePageCache]; ok {
+ delete(mopts, moptForcePageCache)
fsopts.forcePageCache = true
}
- if _, ok := mopts["limit_host_fd_translation"]; ok {
- delete(mopts, "limit_host_fd_translation")
+ if _, ok := mopts[moptLimitHostFDTranslation]; ok {
+ delete(mopts, moptLimitHostFDTranslation)
fsopts.limitHostFDTranslation = true
}
- if _, ok := mopts["overlayfs_stale_read"]; ok {
- delete(mopts, "overlayfs_stale_read")
+ if _, ok := mopts[moptOverlayfsStaleRead]; ok {
+ delete(mopts, moptOverlayfsStaleRead)
fsopts.overlayfsStaleRead = true
}
// fsopts.regularFilesUseSpecialFileFD can only be enabled by specifying
@@ -469,34 +497,34 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
func getFDFromMountOptionsMap(ctx context.Context, mopts map[string]string) (int, error) {
// Check that the transport is "fd".
- trans, ok := mopts["trans"]
- if !ok || trans != "fd" {
- ctx.Warningf("gofer.getFDFromMountOptionsMap: transport must be specified as 'trans=fd'")
+ trans, ok := mopts[moptTransport]
+ if !ok || trans != transportModeFD {
+ ctx.Warningf("gofer.getFDFromMountOptionsMap: transport must be specified as '%s=%s'", moptTransport, transportModeFD)
return -1, syserror.EINVAL
}
- delete(mopts, "trans")
+ delete(mopts, moptTransport)
// Check that read and write FDs are provided and identical.
- rfdstr, ok := mopts["rfdno"]
+ rfdstr, ok := mopts[moptReadFD]
if !ok {
- ctx.Warningf("gofer.getFDFromMountOptionsMap: read FD must be specified as 'rfdno=<file descriptor>'")
+ ctx.Warningf("gofer.getFDFromMountOptionsMap: read FD must be specified as '%s=<file descriptor>'", moptReadFD)
return -1, syserror.EINVAL
}
- delete(mopts, "rfdno")
+ delete(mopts, moptReadFD)
rfd, err := strconv.Atoi(rfdstr)
if err != nil {
- ctx.Warningf("gofer.getFDFromMountOptionsMap: invalid read FD: rfdno=%s", rfdstr)
+ ctx.Warningf("gofer.getFDFromMountOptionsMap: invalid read FD: %s=%s", moptReadFD, rfdstr)
return -1, syserror.EINVAL
}
- wfdstr, ok := mopts["wfdno"]
+ wfdstr, ok := mopts[moptWriteFD]
if !ok {
- ctx.Warningf("gofer.getFDFromMountOptionsMap: write FD must be specified as 'wfdno=<file descriptor>'")
+ ctx.Warningf("gofer.getFDFromMountOptionsMap: write FD must be specified as '%s=<file descriptor>'", moptWriteFD)
return -1, syserror.EINVAL
}
- delete(mopts, "wfdno")
+ delete(mopts, moptWriteFD)
wfd, err := strconv.Atoi(wfdstr)
if err != nil {
- ctx.Warningf("gofer.getFDFromMountOptionsMap: invalid write FD: wfdno=%s", wfdstr)
+ ctx.Warningf("gofer.getFDFromMountOptionsMap: invalid write FD: %s=%s", moptWriteFD, wfdstr)
return -1, syserror.EINVAL
}
if rfd != wfd {
diff --git a/pkg/sentry/fsimpl/host/host.go b/pkg/sentry/fsimpl/host/host.go
index ad5de80dc..b9cce4181 100644
--- a/pkg/sentry/fsimpl/host/host.go
+++ b/pkg/sentry/fsimpl/host/host.go
@@ -260,6 +260,11 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
return vfs.PrependPathSyntheticError{}
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
+
// CheckPermissions implements kernfs.Inode.CheckPermissions.
func (i *inode) CheckPermissions(ctx context.Context, creds *auth.Credentials, ats vfs.AccessTypes) error {
var s unix.Stat_t
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs_test.go b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
index e63588e33..1cd3137e6 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs_test.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
@@ -67,6 +67,11 @@ type filesystem struct {
kernfs.Filesystem
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
+
type file struct {
kernfs.DynamicBytesFile
content string
diff --git a/pkg/sentry/fsimpl/overlay/filesystem.go b/pkg/sentry/fsimpl/overlay/filesystem.go
index 917709d75..84e37f793 100644
--- a/pkg/sentry/fsimpl/overlay/filesystem.go
+++ b/pkg/sentry/fsimpl/overlay/filesystem.go
@@ -1764,3 +1764,15 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
defer fs.renameMu.RUnlock()
return genericPrependPath(vfsroot, vd.Mount(), vd.Dentry().Impl().(*dentry), b)
}
+
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ // Return the mount options from the topmost layer.
+ var vd vfs.VirtualDentry
+ if fs.opts.UpperRoot.Ok() {
+ vd = fs.opts.UpperRoot
+ } else {
+ vd = fs.opts.LowerRoots[0]
+ }
+ return vd.Mount().Filesystem().Impl().MountOptions()
+}
diff --git a/pkg/sentry/fsimpl/pipefs/pipefs.go b/pkg/sentry/fsimpl/pipefs/pipefs.go
index 429733c10..3f05e444e 100644
--- a/pkg/sentry/fsimpl/pipefs/pipefs.go
+++ b/pkg/sentry/fsimpl/pipefs/pipefs.go
@@ -80,6 +80,11 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
return vfs.PrependPathSyntheticError{}
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
+
// inode implements kernfs.Inode.
//
// +stateify savable
diff --git a/pkg/sentry/fsimpl/proc/filesystem.go b/pkg/sentry/fsimpl/proc/filesystem.go
index 8716d0a3c..254a8b062 100644
--- a/pkg/sentry/fsimpl/proc/filesystem.go
+++ b/pkg/sentry/fsimpl/proc/filesystem.go
@@ -104,6 +104,11 @@ func (fs *filesystem) Release(ctx context.Context) {
fs.Filesystem.Release(ctx)
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return fmt.Sprintf("dentry_cache_limit=%d", fs.MaxCachedDentries)
+}
+
// dynamicInode is an overfitted interface for common Inodes with
// dynamicByteSource types used in procfs.
//
diff --git a/pkg/sentry/fsimpl/sockfs/sockfs.go b/pkg/sentry/fsimpl/sockfs/sockfs.go
index fda1fa942..735756280 100644
--- a/pkg/sentry/fsimpl/sockfs/sockfs.go
+++ b/pkg/sentry/fsimpl/sockfs/sockfs.go
@@ -85,6 +85,11 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
return vfs.PrependPathSyntheticError{}
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
+
// inode implements kernfs.Inode.
//
// +stateify savable
diff --git a/pkg/sentry/fsimpl/sys/sys.go b/pkg/sentry/fsimpl/sys/sys.go
index dbd9ebdda..1d9280dae 100644
--- a/pkg/sentry/fsimpl/sys/sys.go
+++ b/pkg/sentry/fsimpl/sys/sys.go
@@ -143,6 +143,11 @@ func (fs *filesystem) Release(ctx context.Context) {
fs.Filesystem.Release(ctx)
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return fmt.Sprintf("dentry_cache_limit=%d", fs.MaxCachedDentries)
+}
+
// dir implements kernfs.Inode.
//
// +stateify savable
diff --git a/pkg/sentry/fsimpl/tmpfs/filesystem.go b/pkg/sentry/fsimpl/tmpfs/filesystem.go
index 4f675c21e..5fdca1d46 100644
--- a/pkg/sentry/fsimpl/tmpfs/filesystem.go
+++ b/pkg/sentry/fsimpl/tmpfs/filesystem.go
@@ -898,3 +898,8 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
d = d.parent
}
}
+
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return fs.mopts
+}
diff --git a/pkg/sentry/fsimpl/tmpfs/tmpfs.go b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
index a01e413e0..8df81f589 100644
--- a/pkg/sentry/fsimpl/tmpfs/tmpfs.go
+++ b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
@@ -70,6 +70,10 @@ type filesystem struct {
// devMinor is the filesystem's minor device number. devMinor is immutable.
devMinor uint32
+ // mopts contains the tmpfs-specific mount options passed to this
+ // filesystem. Immutable.
+ mopts string
+
// mu serializes changes to the Dentry tree.
mu sync.RWMutex `state:"nosave"`
@@ -184,6 +188,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
mfp: mfp,
clock: clock,
devMinor: devMinor,
+ mopts: opts.Data,
}
fs.vfsfs.Init(vfsObj, newFSType, &fs)
diff --git a/pkg/sentry/fsimpl/verity/verity.go b/pkg/sentry/fsimpl/verity/verity.go
index ec64015cd..24c7331bc 100644
--- a/pkg/sentry/fsimpl/verity/verity.go
+++ b/pkg/sentry/fsimpl/verity/verity.go
@@ -419,6 +419,11 @@ func (fs *filesystem) Release(ctx context.Context) {
fs.lowerMount.DecRef(ctx)
}
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+ return ""
+}
+
// dentry implements vfs.DentryImpl.
//
// +stateify savable
diff --git a/pkg/sentry/vfs/anonfs.go b/pkg/sentry/vfs/anonfs.go
index 7ad0eaf86..3caf417ca 100644
--- a/pkg/sentry/vfs/anonfs.go
+++ b/pkg/sentry/vfs/anonfs.go
@@ -291,6 +291,11 @@ func (fs *anonFilesystem) PrependPath(ctx context.Context, vfsroot, vd VirtualDe
return PrependPathSyntheticError{}
}
+// MountOptions implements FilesystemImpl.MountOptions.
+func (fs *anonFilesystem) MountOptions() string {
+ return ""
+}
+
// IncRef implements DentryImpl.IncRef.
func (d *anonDentry) IncRef() {
// no-op
diff --git a/pkg/sentry/vfs/filesystem.go b/pkg/sentry/vfs/filesystem.go
index 2c4b81e78..059939010 100644
--- a/pkg/sentry/vfs/filesystem.go
+++ b/pkg/sentry/vfs/filesystem.go
@@ -502,6 +502,15 @@ type FilesystemImpl interface {
//
// Preconditions: vd.Mount().Filesystem().Impl() == this FilesystemImpl.
PrependPath(ctx context.Context, vfsroot, vd VirtualDentry, b *fspath.Builder) error
+
+ // MountOptions returns mount options for the current filesystem. This
+ // should only return options specific to the filesystem (i.e. don't return
+ // "ro", "rw", etc). Options should be returned as a comma-separated string,
+ // similar to the input to the 5th argument to mount.
+ //
+ // If the implementation has no filesystem-specific options, it should
+ // return the empty string.
+ MountOptions() string
}
// PrependPathAtVFSRootError is returned by implementations of
diff --git a/pkg/sentry/vfs/mount.go b/pkg/sentry/vfs/mount.go
index bac9eb905..922f9e697 100644
--- a/pkg/sentry/vfs/mount.go
+++ b/pkg/sentry/vfs/mount.go
@@ -959,13 +959,17 @@ func manglePath(p string) string {
// superBlockOpts returns the super block options string for the the mount at
// the given path.
func superBlockOpts(mountPath string, mnt *Mount) string {
- // gVisor doesn't (yet) have a concept of super block options, so we
- // use the ro/rw bit from the mount flag.
+ // Compose super block options by combining global mount flags with
+ // FS-specific mount options.
opts := "rw"
if mnt.ReadOnly() {
opts = "ro"
}
+ if mopts := mnt.fs.Impl().MountOptions(); mopts != "" {
+ opts += "," + mopts
+ }
+
// NOTE(b/147673608): If the mount is a cgroup, we also need to include
// the cgroup name in the options. For now we just read that from the
// path.
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 07:25:26 +0000