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Accepting request 765105 from Virtualization:containers

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OBS-URL: https://build.opensuse.org/request/show/765105
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/runc?expand=0&rev=26
This commit is contained in:
Dominique Leuenberger 2020-01-23 15:07:57 +00:00 committed by Git OBS Bridge
commit 341d59c649
2 changed files with 14 additions and 10 deletions
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18
CVE-2019-19921.patch
View File

@ -1,4 +1,4 @@
From 9975f5238a792586bfa3e36e4c66a8d1154b44ac Mon Sep 17 00:00:00 2001
From 3291d66b98445bd7f7d02eac7f2bca2ac2c56942 Mon Sep 17 00:00:00 2001
From: Aleksa Sarai <asarai@suse.de>
Date: Sat, 21 Dec 2019 23:40:17 +1100
Subject: [PATCH] rootfs: do not permit /proc mounts to non-directories
@ -17,19 +17,19 @@ by another container.
Fixes: CVE-2019-19921
Signed-off-by: Aleksa Sarai <asarai@suse.de>
---
libcontainer/rootfs_linux.go | 14 ++++++++++++++
1 file changed, 14 insertions(+)
libcontainer/rootfs_linux.go | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/libcontainer/rootfs_linux.go b/libcontainer/rootfs_linux.go
index 291021440a1a..6bc0747f9f7e 100644
index 291021440a1a..106c4c2b98bf 100644
--- a/libcontainer/rootfs_linux.go
+++ b/libcontainer/rootfs_linux.go
@@ -299,6 +299,20 @@ func mountToRootfs(m *configs.Mount, rootfs, mountLabel string, enableCgroupns b
@@ -299,6 +299,18 @@ func mountToRootfs(m *configs.Mount, rootfs, mountLabel string, enableCgroupns b
switch m.Device {
case "proc", "sysfs":
+ // If the destination already exists and is not a directory, we remove
+ // it. This is to avoid mounting through a symlink or similar -- which
+ // If the destination already exists and is not a directory, we bail
+ // out This is to avoid mounting through a symlink or similar -- which
+ // has been a "fun" attack scenario in the past.
+ // TODO: This won't be necessary once we switch to libpathrs and we can
+ // stop all of these symlink-exchange attacks.
@ -38,9 +38,7 @@ index 291021440a1a..6bc0747f9f7e 100644
+ return err
+ }
+ } else if fi.Mode()&os.ModeDir == 0 {
+ if err := os.Remove(dest); err != nil {
+ return err
+ }
+ return fmt.Errorf("filesystem %q must be mounted on ordinary directory", m.Device)
+ }
if err := os.MkdirAll(dest, 0755); err != nil {
return err

6
runc.changes
View File

@ -1,3 +1,9 @@
-------------------------------------------------------------------
Fri Jan 17 03:02:46 UTC 2020 - Aleksa Sarai <asarai@suse.com>
- Update CVE-2019-19921 patch to match upstream PR.
* CVE-2019-19921.patch
-------------------------------------------------------------------
Tue Jan 14 04:44:36 UTC 2020 - Aleksa Sarai <asarai@suse.com>