[CRIU] [PATCH 5/6] unshare: Mount new proc

[Pavel Emelyanov]

This makes sense in both -- mnt and pid ns, but still makes. So when
we're in new mount namespace add new /proc mountpoint.

Signed-off-by: Pavel Emelyanov <xemul at parallels.com>
---
 crtools.c |  2 +-
 mount.c   | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/crtools.c b/crtools.c
index a1a316f..24b4a3f 100644
--- a/crtools.c
+++ b/crtools.c
@@ -130,7 +130,7 @@ static int parse_unshare_arg(char *opt)
 	}
 
 	/* Only pid, mnt and user for now */
-	if (opts.unshare_flags & ~(CLONE_NEWNS)) {
+	if (opts.unshare_flags & ~(CLONE_NEWNS | 0x1)) {
 		pr_err("Unsharing this namespace(s) is not supported yet\n");
 		return -1;
 	}
diff --git a/mount.c b/mount.c
index 8ebca94..36c4991 100644
--- a/mount.c
+++ b/mount.c
@@ -3112,6 +3112,18 @@ int prepare_mnt_ns(void)
 			return -1;
 		}
 
+		if (opts.unshare_flags & 0x1) {
+			mount(NULL, "/proc", NULL, MS_PRIVATE, NULL);
+			if (mount("proc", "/proc", "proc",
+						MS_MGC_VAL | MS_NOSUID | MS_NOEXEC | MS_NODEV,
+						NULL)) {
+				pr_perror("Can't mount proc\n");
+				return -1;
+			}
+
+			pr_info("Re-mounted new fake proc\n");
+		}
+
 		goto ns_created;
 	}
 
-- 
1.9.3