From cfc24011ad4d1f31bdacbd7e02af10054bcbe6fb Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@google.com>
Date: Wed, 8 Nov 2023 12:33:45 -0800
Subject: [PATCH] vfs: try again to allocate a new mount group after resizing
 vfs.groupIDBitmap

Otherwise, a group id value is always 0x7fffffff in such cases.

PiperOrigin-RevId: 580619582
---
 pkg/sentry/vfs/propagation.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/sentry/vfs/propagation.go b/pkg/sentry/vfs/propagation.go
index be6715e63..d12783b6c 100644
--- a/pkg/sentry/vfs/propagation.go
+++ b/pkg/sentry/vfs/propagation.go
@@ -448,6 +448,10 @@ func (vfs *VirtualFilesystem) allocateGroupID(mnt *Mount) error {
 		if err := vfs.groupIDBitmap.Grow(uint32(vfs.groupIDBitmap.Size())); err != nil {
 			return linuxerr.ENOSPC
 		}
+		groupID, err = vfs.groupIDBitmap.FirstZero(1)
+		if err != nil {
+			return err
+		}
 	}
 	vfs.groupIDBitmap.Add(groupID)
 	mnt.groupID = groupID