diff options
Diffstat (limited to 'pkg/sentry/hostfd/hostfd_unsafe.go')
| -rw-r--r-- | pkg/sentry/hostfd/hostfd_unsafe.go | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/pkg/sentry/hostfd/hostfd_unsafe.go b/pkg/sentry/hostfd/hostfd_unsafe.go index 03c6d2a16..a43311eb4 100644 --- a/pkg/sentry/hostfd/hostfd_unsafe.go +++ b/pkg/sentry/hostfd/hostfd_unsafe.go @@ -23,6 +23,11 @@ import ( "gvisor.dev/gvisor/pkg/safemem" ) +const ( + sizeofIovec = unsafe.Sizeof(unix.Iovec{}) + sizeofMsghdr = unsafe.Sizeof(unix.Msghdr{}) +) + // Preadv2 reads up to dsts.NumBytes() bytes from host file descriptor fd into // dsts. offset and flags are interpreted as for preadv2(2). // @@ -44,9 +49,9 @@ func Preadv2(fd int32, dsts safemem.BlockSeq, offset int64, flags uint32) (uint6 } } else { iovs := safemem.IovecsFromBlockSeq(dsts) - if len(iovs) > maxIov { - log.Debugf("hostfd.Preadv2: truncating from %d iovecs to %d", len(iovs), maxIov) - iovs = iovs[:maxIov] + if len(iovs) > MaxReadWriteIov { + log.Debugf("hostfd.Preadv2: truncating from %d iovecs to %d", len(iovs), MaxReadWriteIov) + iovs = iovs[:MaxReadWriteIov] } n, _, e = unix.Syscall6(unix.SYS_PREADV2, uintptr(fd), uintptr((unsafe.Pointer)(&iovs[0])), uintptr(len(iovs)), uintptr(offset), 0 /* pos_h */, uintptr(flags)) } @@ -80,9 +85,9 @@ func Pwritev2(fd int32, srcs safemem.BlockSeq, offset int64, flags uint32) (uint } } else { iovs := safemem.IovecsFromBlockSeq(srcs) - if len(iovs) > maxIov { - log.Debugf("hostfd.Preadv2: truncating from %d iovecs to %d", len(iovs), maxIov) - iovs = iovs[:maxIov] + if len(iovs) > MaxReadWriteIov { + log.Debugf("hostfd.Preadv2: truncating from %d iovecs to %d", len(iovs), MaxReadWriteIov) + iovs = iovs[:MaxReadWriteIov] } n, _, e = unix.Syscall6(unix.SYS_PWRITEV2, uintptr(fd), uintptr((unsafe.Pointer)(&iovs[0])), uintptr(len(iovs)), uintptr(offset), 0 /* pos_h */, uintptr(flags)) } |