diff options
| author | Dean Deng <deandeng@google.com> | 2020-07-01 22:03:14 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-07-01 22:04:42 -0700 |
| commit | 6c099d830091b3153e0dc39cf500dba441f45707 (patch) | |
| tree | 7aef39f986f41686eab49a39bfb14a85a26929dd /pkg/sentry/fsimpl/host/host.go | |
| parent | 514955c1a8f3927c928a57935d511ffbbf9c6f01 (diff) | |
Update preadv2/pwritev2 flag handling in vfs2.
We do not support RWF_SYNC/RWF_DSYNC and probably shouldn't silently accept
them, since the user may incorrectly believe that we are synchronizing I/O.
Remove the pwritev2 test verifying that we support these flags.
gvisor.dev/issue/2601 is the tracking bug for deciding which RWF_.* flags
we need and supporting them.
Updates #2923, #2601.
PiperOrigin-RevId: 319351286
Diffstat (limited to 'pkg/sentry/fsimpl/host/host.go')
| -rw-r--r-- | pkg/sentry/fsimpl/host/host.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/pkg/sentry/fsimpl/host/host.go b/pkg/sentry/fsimpl/host/host.go index 007b3332e..1cd2982cb 100644 --- a/pkg/sentry/fsimpl/host/host.go +++ b/pkg/sentry/fsimpl/host/host.go @@ -588,8 +588,10 @@ func (f *fileDescription) Read(ctx context.Context, dst usermem.IOSequence, opts } func readFromHostFD(ctx context.Context, hostFD int, dst usermem.IOSequence, offset int64, flags uint32) (int64, error) { + // Check that flags are supported. + // // TODO(gvisor.dev/issue/2601): Support select preadv2 flags. - if flags != 0 { + if flags&^linux.RWF_HIPRI != 0 { return 0, syserror.EOPNOTSUPP } reader := hostfd.GetReadWriterAt(int32(hostFD), offset, flags) |