From 968399f6ee6c8dfb37de4dc853b3c4a369cb0696 Mon Sep 17 00:00:00 2001 From: Wim Taymans Date: Wed, 10 Jan 2024 12:25:26 +0100 Subject: [PATCH] Patch CVE-2023-44446: MXF demuxer use-after-free Resolves: RHEL-16794 --- ...stMXFDemuxEssenceTrack-in-their-own-.patch | 321 ++++++++++++++++++ gstreamer1-plugins-bad-free.spec | 8 +- 2 files changed, 328 insertions(+), 1 deletion(-) create mode 100644 0001-mxfdemux-Store-GstMXFDemuxEssenceTrack-in-their-own-.patch diff --git a/0001-mxfdemux-Store-GstMXFDemuxEssenceTrack-in-their-own-.patch b/0001-mxfdemux-Store-GstMXFDemuxEssenceTrack-in-their-own-.patch new file mode 100644 index 0000000..ce617bf --- /dev/null +++ b/0001-mxfdemux-Store-GstMXFDemuxEssenceTrack-in-their-own-.patch @@ -0,0 +1,321 @@ +From 24e891568537f4447d1c212dcb355a766296bdbb Mon Sep 17 00:00:00 2001 +From: Wim Taymans +Date: Tue, 12 Dec 2023 18:00:58 +0100 +Subject: [PATCH] mxfdemux: Store GstMXFDemuxEssenceTrack in their own fixed + allocation + +Previously they were stored inline inside a GArray, but as references to +the tracks were stored in various other places although the array could +still be updated (and reallocated!), this could lead to dangling +references in various places. + +Instead now store them in a GPtrArray in their own allocation so each +track's memory position stays fixed. + +Fixes ZDI-CAN-22299 + +Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3055 + +Part-of: +--- + gst/mxf/mxfdemux.c | 114 +++++++++++++++++++++------------------------ + gst/mxf/mxfdemux.h | 2 +- + 2 files changed, 53 insertions(+), 63 deletions(-) + +diff --git a/gst/mxf/mxfdemux.c b/gst/mxf/mxfdemux.c +index f6e5ac048..b97dce1ad 100644 +--- a/gst/mxf/mxfdemux.c ++++ b/gst/mxf/mxfdemux.c +@@ -154,10 +154,25 @@ gst_mxf_demux_partition_free (GstMXFDemuxPartition * partition) + } + + static void +-gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux) ++gst_mxf_demux_essence_track_free (GstMXFDemuxEssenceTrack * t) + { +- guint i; ++ if (t->offsets) ++ g_array_free (t->offsets, TRUE); ++ ++ g_free (t->mapping_data); ++ ++ if (t->tags) ++ gst_tag_list_unref (t->tags); ++ ++ if (t->caps) ++ gst_caps_unref (t->caps); ++ ++ g_free (t); ++} + ++static void ++gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux) ++{ + GST_DEBUG_OBJECT (demux, "Resetting MXF state"); + + g_list_foreach (demux->partitions, (GFunc) gst_mxf_demux_partition_free, +@@ -167,22 +182,7 @@ gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux) + + demux->current_partition = NULL; + +- for (i = 0; i < demux->essence_tracks->len; i++) { +- GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); +- +- if (t->offsets) +- g_array_free (t->offsets, TRUE); +- +- g_free (t->mapping_data); +- +- if (t->tags) +- gst_tag_list_unref (t->tags); +- +- if (t->caps) +- gst_caps_unref (t->caps); +- } +- g_array_set_size (demux->essence_tracks, 0); ++ g_ptr_array_set_size (demux->essence_tracks, 0); + } + + static void +@@ -200,7 +200,7 @@ gst_mxf_demux_reset_linked_metadata (GstMXFDemux * demux) + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *track = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + track->source_package = NULL; + track->source_track = NULL; +@@ -713,8 +713,7 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux) + + for (k = 0; k < demux->essence_tracks->len; k++) { + GstMXFDemuxEssenceTrack *tmp = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, +- k); ++ g_ptr_array_index (demux->essence_tracks, k); + + if (tmp->track_number == track->parent.track_number && + tmp->body_sid == edata->body_sid) { +@@ -732,24 +731,23 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux) + } + + if (!etrack) { +- GstMXFDemuxEssenceTrack tmp; ++ GstMXFDemuxEssenceTrack *tmp = g_new0 (GstMXFDemuxEssenceTrack, 1); + +- memset (&tmp, 0, sizeof (tmp)); +- tmp.body_sid = edata->body_sid; +- tmp.index_sid = edata->index_sid; +- tmp.track_number = track->parent.track_number; +- tmp.track_id = track->parent.track_id; +- memcpy (&tmp.source_package_uid, &package->parent.package_uid, 32); ++ tmp->body_sid = edata->body_sid; ++ tmp->index_sid = edata->index_sid; ++ tmp->track_number = track->parent.track_number; ++ tmp->track_id = track->parent.track_id; ++ memcpy (&tmp->source_package_uid, &package->parent.package_uid, 32); + + if (demux->current_partition->partition.body_sid == edata->body_sid && + demux->current_partition->partition.body_offset == 0) +- tmp.position = 0; ++ tmp->position = 0; + else +- tmp.position = -1; ++ tmp->position = -1; + +- g_array_append_val (demux->essence_tracks, tmp); ++ g_ptr_array_add (demux->essence_tracks, tmp); + etrack = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, ++ g_ptr_array_index (demux->essence_tracks, + demux->essence_tracks->len - 1); + new = TRUE; + } +@@ -876,13 +874,7 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux) + + next: + if (new) { +- g_free (etrack->mapping_data); +- if (etrack->tags) +- gst_tag_list_unref (etrack->tags); +- if (etrack->caps) +- gst_caps_unref (etrack->caps); +- +- g_array_remove_index (demux->essence_tracks, ++ g_ptr_array_remove_index (demux->essence_tracks, + demux->essence_tracks->len - 1); + } + } +@@ -895,7 +887,7 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux) + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *etrack = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (!etrack->source_package || !etrack->source_track || !etrack->caps) { + GST_ERROR_OBJECT (demux, "Failed to update essence track %u", i); +@@ -1117,7 +1109,7 @@ gst_mxf_demux_update_tracks (GstMXFDemux * demux) + + for (k = 0; k < demux->essence_tracks->len; k++) { + GstMXFDemuxEssenceTrack *tmp = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, k); ++ g_ptr_array_index (demux->essence_tracks, k); + + if (tmp->source_package == source_package && + tmp->source_track == source_track) { +@@ -1598,8 +1590,7 @@ gst_mxf_demux_pad_set_component (GstMXFDemux * demux, GstMXFDemuxPad * pad, + pad->current_essence_track = NULL; + + for (k = 0; k < demux->essence_tracks->len; k++) { +- GstMXFDemuxEssenceTrack *tmp = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, k); ++ GstMXFDemuxEssenceTrack *tmp = g_ptr_array_index (demux->essence_tracks, k); + + if (tmp->source_package == source_package && + tmp->source_track == source_track) { +@@ -1731,7 +1722,7 @@ gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux, + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *tmp = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (tmp->body_sid == demux->current_partition->partition.body_sid && + (tmp->track_number == track_number || tmp->track_number == 0)) { +@@ -2656,7 +2647,7 @@ gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key, + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *etrack = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (etrack->body_sid != demux->current_partition->partition.body_sid) + continue; +@@ -2719,7 +2710,7 @@ gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key, + guint i; + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *etrack = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (etrack->body_sid != demux->current_partition->partition.body_sid) + continue; +@@ -2914,7 +2905,7 @@ from_index: + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (index_start_position != -1 && t == etrack) + t->position = index_start_position; +@@ -2937,8 +2928,7 @@ from_index: + if (ret == GST_FLOW_EOS) { + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, +- i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (t->position > 0) + t->duration = t->position; +@@ -3020,7 +3010,7 @@ gst_mxf_demux_pull_and_handle_klv_packet (GstMXFDemux * demux) + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (t->position > 0) + t->duration = t->position; +@@ -3627,8 +3617,8 @@ gst_mxf_demux_seek_push (GstMXFDemux * demux, GstEvent * event) + } + + for (i = 0; i < demux->essence_tracks->len; i++) { +- GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ GstMXFDemuxEssenceTrack *t = g_ptr_array_index (demux->essence_tracks, i); ++ + t->position = -1; + } + +@@ -4001,8 +3991,8 @@ gst_mxf_demux_seek_pull (GstMXFDemux * demux, GstEvent * event) + } + + for (i = 0; i < demux->essence_tracks->len; i++) { +- GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ GstMXFDemuxEssenceTrack *t = g_ptr_array_index (demux->essence_tracks, i); ++ + t->position = -1; + } + +@@ -4284,7 +4274,7 @@ gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i); ++ g_ptr_array_index (demux->essence_tracks, i); + + if (t->position > 0) + t->duration = t->position; +@@ -4325,8 +4315,8 @@ gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *etrack = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, +- i); ++ g_ptr_array_index (demux->essence_tracks, i); ++ + etrack->position = -1; + } + ret = TRUE; +@@ -4350,8 +4340,8 @@ gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) + + for (i = 0; i < demux->essence_tracks->len; i++) { + GstMXFDemuxEssenceTrack *t = +- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, +- i); ++ g_ptr_array_index (demux->essence_tracks, i); ++ + t->position = -1; + } + demux->current_partition = NULL; +@@ -4624,7 +4614,7 @@ gst_mxf_demux_finalize (GObject * object) + + g_ptr_array_free (demux->src, TRUE); + demux->src = NULL; +- g_array_free (demux->essence_tracks, TRUE); ++ g_ptr_array_free (demux->essence_tracks, TRUE); + demux->essence_tracks = NULL; + + g_hash_table_destroy (demux->metadata); +@@ -4701,8 +4691,8 @@ gst_mxf_demux_init (GstMXFDemux * demux) + g_rw_lock_init (&demux->metadata_lock); + + demux->src = g_ptr_array_new (); +- demux->essence_tracks = +- g_array_new (FALSE, FALSE, sizeof (GstMXFDemuxEssenceTrack)); ++ demux->essence_tracks = g_ptr_array_new_with_free_func ((GDestroyNotify) ++ gst_mxf_demux_essence_track_free); + + gst_segment_init (&demux->segment, GST_FORMAT_TIME); + +diff --git a/gst/mxf/mxfdemux.h b/gst/mxf/mxfdemux.h +index aac3e67d0..a452980ee 100644 +--- a/gst/mxf/mxfdemux.h ++++ b/gst/mxf/mxfdemux.h +@@ -182,7 +182,7 @@ struct _GstMXFDemux + GList *partitions; + GstMXFDemuxPartition *current_partition; + +- GArray *essence_tracks; ++ GPtrArray *essence_tracks; + + GList *pending_index_table_segments; + GList *index_tables; /* one per BodySID / IndexSID */ +-- +2.43.0 + diff --git a/gstreamer1-plugins-bad-free.spec b/gstreamer1-plugins-bad-free.spec index 5ec7e1c..7c29711 100644 --- a/gstreamer1-plugins-bad-free.spec +++ b/gstreamer1-plugins-bad-free.spec @@ -14,7 +14,7 @@ Name: gstreamer1-plugins-bad-free Version: 1.16.1 -Release: 1%{?gitcommit:.git%{shortcommit}}%{?dist} +Release: 2%{?gitcommit:.git%{shortcommit}}%{?dist} Summary: GStreamer streaming media framework "bad" plugins License: LGPLv2+ and LGPLv2 @@ -32,6 +32,7 @@ Source0: gst-plugins-bad-free-%{version}.tar.xz Source1: gst-p-bad-cleanup.sh #upstream patches +Patch0: 0001-mxfdemux-Store-GstMXFDemuxEssenceTrack-in-their-own-.patch BuildRequires: gstreamer1-devel >= %{version} BuildRequires: gstreamer1-plugins-base-devel >= %{version} @@ -184,6 +185,7 @@ aren't tested well enough, or the code is not of good enough quality. %prep %setup -q -n gst-plugins-bad-%{version} +%patch0 -p1 %build %configure --disable-silent-rules --disable-fatal-warnings \ @@ -472,6 +474,10 @@ find $RPM_BUILD_ROOT -name '*.la' -exec rm -fv {} ';' %changelog +* Wed Dec 13 2023 Wim Taymans - 1.16.1-2 +- Patch CVE-2023-44446: MXF demuxer use-after-free +- Resolves: RHEL-16794 + * Mon Nov 18 2019 Wim Taymans - 1.16.1-1 - Update to 1.16.1 - Remove upstreamed patches