diff options
| author | Jamie Liu <jamieliu@google.com> | 2020-11-06 00:18:34 -0800 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-11-06 00:20:35 -0800 |
| commit | 29683f359822310d0f81a5c0f6ccaf98d6c284a3 (patch) | |
| tree | 693f4e72d5ec70713cebb45887b87216bdc54815 /pkg/sentry/hostfd/hostfd_unsafe.go | |
| parent | 06e33cd737c59623ddcca60eacefb112fc1a0cd4 (diff) | |
Cap iovec array length in //pkg/sentry/hostfd.
PiperOrigin-RevId: 341001328
Diffstat (limited to 'pkg/sentry/hostfd/hostfd_unsafe.go')
| -rw-r--r-- | pkg/sentry/hostfd/hostfd_unsafe.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/pkg/sentry/hostfd/hostfd_unsafe.go b/pkg/sentry/hostfd/hostfd_unsafe.go index cd4dc67fb..694371b1c 100644 --- a/pkg/sentry/hostfd/hostfd_unsafe.go +++ b/pkg/sentry/hostfd/hostfd_unsafe.go @@ -20,6 +20,7 @@ import ( "unsafe" "golang.org/x/sys/unix" + "gvisor.dev/gvisor/pkg/log" "gvisor.dev/gvisor/pkg/safemem" ) @@ -44,6 +45,10 @@ 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] + } n, _, e = syscall.Syscall6(unix.SYS_PREADV2, uintptr(fd), uintptr((unsafe.Pointer)(&iovs[0])), uintptr(len(iovs)), uintptr(offset), 0 /* pos_h */, uintptr(flags)) } if e != 0 { @@ -76,6 +81,10 @@ 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] + } n, _, e = syscall.Syscall6(unix.SYS_PWRITEV2, uintptr(fd), uintptr((unsafe.Pointer)(&iovs[0])), uintptr(len(iovs)), uintptr(offset), 0 /* pos_h */, uintptr(flags)) } if e != 0 { |