1 files changed, 40 insertions, 0 deletions
diff --git a/poky/meta/recipes-extended/screen/screen/signal-permission.patch b/poky/meta/recipes-extended/screen/screen/signal-permission.patch
new file mode 100644
index 0000000000..77dc649090
--- /dev/null
+++ b/poky/meta/recipes-extended/screen/screen/signal-permission.patch
@@ -0,0 +1,40 @@
+From e9ad41bfedb4537a6f0de20f00b27c7739f168f7 Mon Sep 17 00:00:00 2001
+From: Alexander Naumov <alexander_naumov@opensuse.org>
+Date: Mon, 30 Jan 2023 17:22:25 +0200
+Subject: fix: missing signal sending permission check on failed query messages
+
+Signed-off-by: Alexander Naumov <alexander_naumov@opensuse.org>
+
+CVE: CVE-2023-24626
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ src/socket.c | 9 +++++++--
+ 1 file changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/src/socket.c b/src/socket.c
+index 147dc54..54d8cb8 100644
+--- a/socket.c
++++ b/socket.c
+@@ -1285,11 +1285,16 @@ ReceiveMsg()
+           else
+             queryflag = -1;
+ 
+-          Kill(m.m.command.apid,
++          if (CheckPid(m.m.command.apid)) {
++            Msg(0, "Query attempt with bad pid(%d)!", m.m.command.apid);
++          }
++          else {
++            Kill(m.m.command.apid,
+                (queryflag >= 0)
+                    ? SIGCONT
+                    : SIG_BYE); /* Send SIG_BYE if an error happened */
+-          queryflag = -1;
++            queryflag = -1;
++          }
+         }
+         break;
+       case MSG_COMMAND:
+-- 
+cgit v1.1
+