diff options
| -rw-r--r-- | pkg/sentry/kernel/ptrace.go | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/pkg/sentry/kernel/ptrace.go b/pkg/sentry/kernel/ptrace.go index e21a25ae6..9fe28f435 100644 --- a/pkg/sentry/kernel/ptrace.go +++ b/pkg/sentry/kernel/ptrace.go @@ -921,7 +921,13 @@ func (t *Task) Ptrace(req int64, pid ThreadID, addr, data usermem.Addr) error { if err != nil { return err } - ar.End -= usermem.Addr(n) + + // Update iovecs to represent the range of the written register set. + end, ok := ar.Start.AddLength(uint64(n)) + if !ok { + panic(fmt.Sprintf("%#x + %#x overflows. Invalid reg size > %#x", ar.Start, n, ar.Length())) + } + ar.End = end return t.CopyOutIovecs(data, usermem.AddrRangeSeqOf(ar)) case linux.PTRACE_SETREGS: |