From: Richard Weinberger <richard@nod.at>
Date: Sat, 9 Feb 2013 18:22:50 +0000 (+0100)
Subject: switch_root: Add a sanity check
X-Git-Tag: v2.23-rc1~227
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=07de470e437f204e3d40b8b0a85f57c1978ff9ed;p=thirdparty%2Futil-linux.git

switch_root: Add a sanity check

As switch_root basically does rm -Rf / we should make sure
that / is really an initramfs.

Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/sys-utils/switch_root.c b/sys-utils/switch_root.c
index f0ef67745f..f26f7dae43 100644
--- a/sys-utils/switch_root.c
+++ b/sys-utils/switch_root.c
@@ -174,7 +174,13 @@ static int switchroot(const char *newroot)
 	if (cfd >= 0) {
 		pid = fork();
 		if (pid <= 0) {
-			recursiveRemove(cfd);
+			if (fstat(cfd, &sb) == 0) {
+				if (sb.st_dev == makedev(0, 1))
+					recursiveRemove(cfd);
+				else
+					warn(_("old root filesystem is not an initramfs"));
+			}
+
 			if (pid == 0)
 				exit(EXIT_SUCCESS);
 		}