1 files changed, 113 insertions, 0 deletions

diff --git a/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-21885.patch b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-21885.patch
new file mode 100644
index 0000000000..7c8fbcc3ec
--- /dev/null
+++ b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2024-21885.patch
@@ -0,0 +1,113 @@
+From 4a5e9b1895627d40d26045bd0b7ef3dce503cbd1 Mon Sep 17 00:00:00 2001
+From: Peter Hutterer <peter.hutterer@who-t.net>
+Date: Thu, 4 Jan 2024 10:01:24 +1000
+Subject: [PATCH] Xi: flush hierarchy events after adding/removing master
+ devices
+
+The `XISendDeviceHierarchyEvent()` function allocates space to store up
+to `MAXDEVICES` (256) `xXIHierarchyInfo` structures in `info`.
+
+If a device with a given ID was removed and a new device with the same
+ID added both in the same operation, the single device ID will lead to
+two info structures being written to `info`.
+
+Since this case can occur for every device ID at once, a total of two
+times `MAXDEVICES` info structures might be written to the allocation.
+
+To avoid it, once one add/remove master is processed, send out the
+device hierarchy event for the current state and continue. That event
+thus only ever has exactly one of either added/removed in it (and
+optionally slave attached/detached).
+
+CVE-2024-21885, ZDI-CAN-22744
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/4a5e9b1895627d40d26045bd0b7ef3dce503cbd1]
+CVE: CVE-2024-21885
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ Xi/xichangehierarchy.c | 27 ++++++++++++++++++++++-----
+ 1 file changed, 22 insertions(+), 5 deletions(-)
+
+diff --git a/Xi/xichangehierarchy.c b/Xi/xichangehierarchy.c
+index d2d985848d..72d00451e3 100644
+--- a/Xi/xichangehierarchy.c
++++ b/Xi/xichangehierarchy.c
+@@ -416,6 +416,11 @@ ProcXIChangeHierarchy(ClientPtr client)
+     size_t len;                        /* length of data remaining in request */
+     int rc = Success;
+     int flags[MAXDEVICES] = { 0 };
++    enum {
++        NO_CHANGE,
++        FLUSH,
++        CHANGED,
++    } changes = NO_CHANGE;
+ 
+     REQUEST(xXIChangeHierarchyReq);
+     REQUEST_AT_LEAST_SIZE(xXIChangeHierarchyReq);
+@@ -465,8 +470,9 @@ ProcXIChangeHierarchy(ClientPtr client)
+             rc = add_master(client, c, flags);
+             if (rc != Success)
+                 goto unwind;
+-        }
++            changes = FLUSH;
+             break;
++        }
+         case XIRemoveMaster:
+         {
+             xXIRemoveMasterInfo *r = (xXIRemoveMasterInfo *) any;
+@@ -475,8 +481,9 @@ ProcXIChangeHierarchy(ClientPtr client)
+             rc = remove_master(client, r, flags);
+             if (rc != Success)
+                 goto unwind;
+-        }
++            changes = FLUSH;
+             break;
++        }
+         case XIDetachSlave:
+         {
+             xXIDetachSlaveInfo *c = (xXIDetachSlaveInfo *) any;
+@@ -485,8 +492,9 @@ ProcXIChangeHierarchy(ClientPtr client)
+             rc = detach_slave(client, c, flags);
+             if (rc != Success)
+                 goto unwind;
+-        }
++            changes = CHANGED;
+             break;
++        }
+         case XIAttachSlave:
+         {
+             xXIAttachSlaveInfo *c = (xXIAttachSlaveInfo *) any;
+@@ -495,16 +503,25 @@ ProcXIChangeHierarchy(ClientPtr client)
+             rc = attach_slave(client, c, flags);
+             if (rc != Success)
+                 goto unwind;
++            changes = CHANGED;
++            break;
+         }
++        default:
+             break;
+         }
+ 
++        if (changes == FLUSH) {
++            XISendDeviceHierarchyEvent(flags);
++            memset(flags, 0, sizeof(flags));
++            changes = NO_CHANGE;
++        }
++
+         len -= any->length * 4;
+         any = (xXIAnyHierarchyChangeInfo *) ((char *) any + any->length * 4);
+     }
+ 
+  unwind:
+-
+-    XISendDeviceHierarchyEvent(flags);
++    if (changes != NO_CHANGE)
++        XISendDeviceHierarchyEvent(flags);
+     return rc;
+ }
+-- 
+GitLab
+