systemd/0017-basic-forbid-rm_rf-to-remove-paths-ending-with-.-565.patch
Zbigniew Jędrzejewski-Szmek d743bb5bcc Revert "Build with meson"
This reverts commits 3fb4a15096
and 0e8350ca14.

Either building with meson or other upstream changes was causing
issues with booting, and I didn't have time to debug this properly.
2017-06-27 13:42:28 -04:00

30 lines
1.3 KiB
Diff

From 677a50e8e931741a174f45d9cae981253dfae3ff Mon Sep 17 00:00:00 2001
From: Jan Synacek <jan.synacek@gmail.com>
Date: Wed, 29 Mar 2017 08:25:52 +0200
Subject: [PATCH] basic: forbid rm_rf() to remove paths ending with ".."
(#5653)
Fixes: #5644(cherry picked from commit ab883125704b9310dcdfcf7451a27e85609da76c)
---
src/basic/rm-rf.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/basic/rm-rf.c b/src/basic/rm-rf.c
index 08497af729..bdaca264ff 100644
--- a/src/basic/rm-rf.c
+++ b/src/basic/rm-rf.c
@@ -187,6 +187,13 @@ int rm_rf(const char *path, RemoveFlags flags) {
return -EPERM;
}
+ /* Another safe-check. Removing "/path/.." could easily remove entire root as well.
+ * It's especially easy to do using globs in tmpfiles, like "/path/.*", which the glob()
+ * function expands to both "/path/." and "/path/..".
+ * Return -EINVAL to be consistent with rmdir("/path/."). */
+ if (endswith(path, "/..") || endswith(path, "/../"))
+ return -EINVAL;
+
if ((flags & (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) == (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) {
/* Try to remove as subvolume first */
r = btrfs_subvol_remove(path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);