diff options
Diffstat (limited to 'pkg/sentry/syscalls/linux/sys_file.go')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_file.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_file.go b/pkg/sentry/syscalls/linux/sys_file.go index 5fbacc15e..1d61ac9f0 100644 --- a/pkg/sentry/syscalls/linux/sys_file.go +++ b/pkg/sentry/syscalls/linux/sys_file.go @@ -1929,8 +1929,16 @@ func Sendfile(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysc // If we don't have a provided offset. } else { // Send data using readv. + inOff := inFile.Offset() r := &io.LimitedReader{R: &fs.FileReader{t, inFile}, N: count} n, err = io.Copy(w, r) + inOff += n + if inFile.Offset() != inOff { + // Adjust file position in case more bytes were read than written. + if _, err := inFile.Seek(t, fs.SeekSet, inOff); err != nil { + return 0, nil, syserror.EIO + } + } } // We can only pass a single file to handleIOError, so pick inFile |