diff options
Diffstat (limited to 'pkg/sentry/memutil/memutil_unsafe.go')
| -rw-r--r-- | pkg/sentry/memutil/memutil_unsafe.go | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/pkg/sentry/memutil/memutil_unsafe.go b/pkg/sentry/memutil/memutil_unsafe.go index 8d9fc64fb..bc2c72f55 100644 --- a/pkg/sentry/memutil/memutil_unsafe.go +++ b/pkg/sentry/memutil/memutil_unsafe.go @@ -15,6 +15,7 @@ package memutil import ( + "fmt" "syscall" "unsafe" @@ -22,14 +23,17 @@ import ( ) // CreateMemFD creates a memfd file and returns the fd. -func CreateMemFD(name string, flags int) (fd int, err error) { +func CreateMemFD(name string, flags int) (int, error) { p, err := syscall.BytePtrFromString(name) if err != nil { return -1, err } - r0, _, e0 := syscall.Syscall(unix.SYS_MEMFD_CREATE, uintptr(unsafe.Pointer(p)), uintptr(flags), 0) - if e0 != 0 { - return -1, e0 + fd, _, e := syscall.Syscall(unix.SYS_MEMFD_CREATE, uintptr(unsafe.Pointer(p)), uintptr(flags), 0) + if e != 0 { + if e == syscall.ENOSYS { + return -1, fmt.Errorf("memfd_create(2) is not implemented. Check that you have Linux 3.17 or higher") + } + return -1, e } - return int(r0), nil + return int(fd), nil } |