From 3b0b1f104d963a1d11973c444934e6744ab7e79b Mon Sep 17 00:00:00 2001
From: Jamie Liu <jamieliu@google.com>
Date: Tue, 16 Jun 2020 00:14:07 -0700
Subject: Miscellaneous VFS2 fixes.

PiperOrigin-RevId: 316627764
---
 pkg/sentry/syscalls/linux/vfs2/ioctl.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'pkg/sentry/syscalls/linux')

diff --git a/pkg/sentry/syscalls/linux/vfs2/ioctl.go b/pkg/sentry/syscalls/linux/vfs2/ioctl.go
index 5a2418da9..0399c0db4 100644
--- a/pkg/sentry/syscalls/linux/vfs2/ioctl.go
+++ b/pkg/sentry/syscalls/linux/vfs2/ioctl.go
@@ -15,6 +15,7 @@
 package vfs2
 
 import (
+	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/syserror"
@@ -30,6 +31,34 @@ func Ioctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscall
 	}
 	defer file.DecRef()
 
+	// Handle ioctls that apply to all FDs.
+	switch args[1].Int() {
+	case linux.FIONCLEX:
+		t.FDTable().SetFlagsVFS2(fd, kernel.FDFlags{
+			CloseOnExec: false,
+		})
+		return 0, nil, nil
+
+	case linux.FIOCLEX:
+		t.FDTable().SetFlagsVFS2(fd, kernel.FDFlags{
+			CloseOnExec: true,
+		})
+		return 0, nil, nil
+
+	case linux.FIONBIO:
+		var set int32
+		if _, err := t.CopyIn(args[2].Pointer(), &set); err != nil {
+			return 0, nil, err
+		}
+		flags := file.StatusFlags()
+		if set != 0 {
+			flags |= linux.O_NONBLOCK
+		} else {
+			flags &^= linux.O_NONBLOCK
+		}
+		return 0, nil, file.SetStatusFlags(t, t.Credentials(), flags)
+	}
+
 	ret, err := file.Ioctl(t, t.MemoryManager(), args)
 	return ret, nil, err
 }
-- 
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