diff options
Diffstat (limited to 'pkg/sentry/syscalls/linux/sys_file.go')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_file.go | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_file.go b/pkg/sentry/syscalls/linux/sys_file.go index 7ad0c9517..cf6fdc190 100644 --- a/pkg/sentry/syscalls/linux/sys_file.go +++ b/pkg/sentry/syscalls/linux/sys_file.go @@ -2022,7 +2022,6 @@ func Sendfile(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysc } // Setup for sending data. - var offset uint64 var n int64 var err error w := &fs.FileWriter{t, outFile} @@ -2034,14 +2033,18 @@ func Sendfile(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysc return 0, nil, syserror.ESPIPE } // Copy in the offset. + var offset int64 if _, err := t.CopyIn(offsetAddr, &offset); err != nil { return 0, nil, err } + if offset < 0 { + return 0, nil, syserror.EINVAL + } // Send data using Preadv. - r := io.NewSectionReader(&fs.FileReader{t, inFile}, int64(offset), count) + r := io.NewSectionReader(&fs.FileReader{t, inFile}, offset, count) n, err = io.Copy(w, r) // Copy out the new offset. - if _, err := t.CopyOut(offsetAddr, n+int64(offset)); err != nil { + if _, err := t.CopyOut(offsetAddr, n+offset); err != nil { return 0, nil, err } // If we don't have a provided offset. |