new file mode 100644
@@ -0,0 +1,74 @@
+From ed8b418f1341cf7fc576f6b17de5c6dd4017e034 Mon Sep 17 00:00:00 2001
+From: "Jeremy A. Puhlman" <jpuhlman@mvista.com>
+Date: Thu, 27 Jan 2022 00:01:27 +0000
+Subject: [PATCH] CVE-2021-4034: Local privilege escalation in pkexec due to
+ incorrect handling of argument vector
+
+Upstream-Status: Backport https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683
+CVE: CVE-2021-4034
+
+Signed-off-by: Jeremy A. Puhlman <jpuhlman@mvista.com>
+---
+ src/programs/pkcheck.c | 6 ++++++
+ src/programs/pkexec.c | 21 ++++++++++++++++++++-
+ 2 files changed, 26 insertions(+), 1 deletion(-)
+
+diff --git a/src/programs/pkcheck.c b/src/programs/pkcheck.c
+index f1bb4e1..aff4f60 100644
+--- a/src/programs/pkcheck.c
++++ b/src/programs/pkcheck.c
+@@ -363,6 +363,12 @@ main (int argc, char *argv[])
+ local_agent_handle = NULL;
+ ret = 126;
+
++ if (argc < 1)
++ {
++ help();
++ exit(1);
++ }
++
+ /* Disable remote file access from GIO. */
+ setenv ("GIO_USE_VFS", "local", 1);
+
+diff --git a/src/programs/pkexec.c b/src/programs/pkexec.c
+index 7698c5c..3ff4c58 100644
+--- a/src/programs/pkexec.c
++++ b/src/programs/pkexec.c
+@@ -488,6 +488,17 @@ main (int argc, char *argv[])
+ pid_t pid_of_caller;
+ gpointer local_agent_handle;
+
++
++ /*
++ * If 'pkexec' is called wrong, just show help and bail out.
++ */
++ if (argc<1)
++ {
++ clearenv();
++ usage(argc, argv);
++ exit(1);
++ }
++
+ ret = 127;
+ authority = NULL;
+ subject = NULL;
+@@ -636,7 +647,15 @@ main (int argc, char *argv[])
+ goto out;
+ }
+ g_free (path);
+- argv[n] = path = s;
++ path = s;
++
++ /* argc<2 and pkexec runs just shell, argv is guaranteed to be null-terminated.
++ * /-less shell shouldn't happen, but let's be defensive and don't write to null-termination
++ */
++ if (argv[n] != NULL)
++ {
++ argv[n] = path;
++ }
+ }
+ if (access (path, F_OK) != 0)
+ {
+--
+2.26.2
+
@@ -25,6 +25,7 @@ PAM_SRC_URI = "file://polkit-1_pam.patch"
SRC_URI = "http://www.freedesktop.org/software/polkit/releases/polkit-${PV}.tar.gz \
${@bb.utils.contains('DISTRO_FEATURES', 'pam', '${PAM_SRC_URI}', '', d)} \
file://0003-make-netgroup-support-optional.patch \
+ file://CVE-2021-4034.patch \
"
SRC_URI[md5sum] = "4b37258583393e83069a0e2e89c0162a"
SRC_URI[sha256sum] = "88170c9e711e8db305a12fdb8234fac5706c61969b94e084d0f117d8ec5d34b1"
Upstream-Status: Backport CVE: CVE-2021-4034 Signed-off-by: Jeremy A. Puhlman <jpuhlman@mvista.com> --- .../polkit/files/CVE-2021-4034.patch | 74 +++++++++++++++++++ .../recipes-extended/polkit/polkit_0.116.bb | 1 + 2 files changed, 75 insertions(+) create mode 100644 meta-oe/recipes-extended/polkit/files/CVE-2021-4034.patch