libsepol: Security fix CVE-2021-36085

Source: https://github.com/SELinuxProject/selinux/
MR: 111857
Type: Security Fix
Disposition: Backport from https://github.com/SELinuxProject/selinux/commit/2d35fcc7e9e976a2346b1de20e54f8663e8a6cba
ChangeID: e50ae65189351ee618db2b278ba7105a5728e4c4
Description:

Affects: libsepol <= 3.2

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>

2 files changed, 39 insertions, 0 deletions

diff --git a/recipes-security/selinux/libsepol/CVE-2021-36085.patch b/recipes-security/selinux/libsepol/CVE-2021-36085.patch
new file mode 100644
index 0000000..4bd05eb
--- /dev/null
+++ b/recipes-security/selinux/libsepol/CVE-2021-36085.patch
@@ -0,0 +1,38 @@
+From 2d35fcc7e9e976a2346b1de20e54f8663e8a6cba Mon Sep 17 00:00:00 2001
+From: James Carter <jwcart2@gmail.com>
+Date: Thu, 8 Apr 2021 13:32:04 -0400
+Subject: [PATCH] libsepol/cil: Destroy classperm list when resetting map perms
+
+Map perms share the same struct as regular perms, but only the
+map perms use the classperms field. This field is a pointer to a
+list of classperms that is created and added to when resolving
+classmapping rules, so the map permission doesn't own any of the
+data in the list and this list should be destroyed when the AST is
+reset.
+
+When resetting a perm, destroy the classperms list without destroying
+the data in the list.
+
+Signed-off-by: James Carter <jwcart2@gmail.com>
+
+Upstream-Status: Backport
+CVE: CVE-2021-36085
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ libsepol/cil/src/cil_reset_ast.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: libsepol-3.0/cil/src/cil_reset_ast.c
+===================================================================
+--- libsepol-3.0.orig/cil/src/cil_reset_ast.c
++++ libsepol-3.0/cil/src/cil_reset_ast.c
+@@ -34,7 +34,7 @@ static void cil_reset_class(struct cil_c
+ 
+ static void cil_reset_perm(struct cil_perm *perm)
+ {
+-       cil_reset_classperms_list(perm->classperms);
++       cil_list_destroy(&perm->classperms, CIL_FALSE);
+ }
+ 
+ static inline void cil_reset_classperms(struct cil_classperms *cp)
diff --git a/recipes-security/selinux/libsepol_3.0.bb b/recipes-security/selinux/libsepol_3.0.bb
index 537377b..b7a7071 100644
--- a/recipes-security/selinux/libsepol_3.0.bb
+++ b/recipes-security/selinux/libsepol_3.0.bb
@@ -10,4 +10,5 @@ SRC_URI += "\
         file://0001-libsepol-fix-CIL_KEY_-build-errors-with-fno-common.patch \
         file://0001-libsepol-remove-leftovers-of-cil_mem_error_handler.patch \
         file://CVE-2021-36084.patch \
+        file://CVE-2021-36085.patch \
         "