commit 46a550989f7b2c934dfdf43ef28e9018ad60bd31
author Jorge Lucangeli Obes <jorgelo@google.com> Mon Oct 12 15:31:59 2015 -0700
committer Jorge Lucangeli Obes <jorgelo@google.com> Mon Oct 12 15:40:38 2015 -0700
tree c7f99f621249bbde0cc634420c22917b6af686db
parent 68db15cc2ea5b8314b4c8f7f3920423aeb5e25eb

Call chdir("/") after chroot in pivot_root.

This change adds a chdir after chroot to avoid chroot breakouts.

BUG=chromium:517844
TEST=getcwd() returns "/" instead of "(unreachable)/.../root"

(Original patch by Luis Hector Chavez <lhchavez@google.com> at
https://chromium-review.googlesource.com/#/c/304362/)

Change-Id: If78f357636bcc1a3bfa71f377fef2ccc05b6dc0f

libminijail.c

diff --git a/libminijail.c b/libminijail.c
index 5ccb9c1..c66060c 100644
--- a/libminijail.c
+++ b/libminijail.c
@@ -800,6 +800,9 @@
 		return -errno;
 	if (chroot("/"))
 		return -errno;
+	/* Set correct CWD for getcwd(3). */
+	if (chdir("/"))
+		return -errno;
 
 	return 0;
 }