From 1330662f33a55e88bfe18e76de28b7922d91a999 Mon Sep 17 00:00:00 2001
From: Simon McVittie <smcv@collabora.com>
Date: Wed, 1 Sep 2021 14:20:29 +0100
Subject: [PATCH] run: Don't allow unmounting filesystems

If we don't allow mounting filesystems, we shouldn't allow unmounting
either.

Partially fixes GHSA-67h7-w3jq-vh4q.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Conflict:NA
Reference:https://github.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999

---
 common/flatpak-run.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/flatpak-run.c b/common/flatpak-run.c
index c266dbe..b1a8db5 100644
--- a/common/flatpak-run.c
+++ b/common/flatpak-run.c
@@ -2821,6 +2821,8 @@ setup_seccomp (FlatpakBwrap   *bwrap,
     {SCMP_SYS (unshare), EPERM},
     {SCMP_SYS (setns), EPERM},
     {SCMP_SYS (mount), EPERM},
+    {SCMP_SYS (umount), EPERM},
+    {SCMP_SYS (umount2), EPERM},
     {SCMP_SYS (pivot_root), EPERM},
 #if defined(__s390__) || defined(__s390x__) || defined(__CRIS__)
     /* Architectures with CONFIG_CLONE_BACKWARDS2: the child stack
-- 
2.27.0