From 822d847ccaa1e6016b818bee289b5e33335f9fee Mon Sep 17 00:00:00 2001 From: Dean Deng Date: Fri, 20 Dec 2019 08:43:15 -0800 Subject: Check for valid nfds before copying in an fd set. Otherwise, CopyInFDSet will try to allocate a negative-length slice. PiperOrigin-RevId: 286584907 --- pkg/sentry/strace/select.go | 3 +++ 1 file changed, 3 insertions(+) (limited to 'pkg') diff --git a/pkg/sentry/strace/select.go b/pkg/sentry/strace/select.go index dea309fda..c77d418e6 100644 --- a/pkg/sentry/strace/select.go +++ b/pkg/sentry/strace/select.go @@ -36,6 +36,9 @@ func fdsFromSet(t *kernel.Task, set []byte) []int { } func fdSet(t *kernel.Task, nfds int, addr usermem.Addr) string { + if nfds < 0 { + return fmt.Sprintf("%#x (negative nfds)", addr) + } if addr == 0 { return "null" } -- cgit v1.2.3