Auto sync2gitlab import of gstreamer1-plugins-good-1.16.1-3.el8.src.rpm
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9efd93e20dd7789e4172ad6c8f4108271b3fb1ee.patch
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9efd93e20dd7789e4172ad6c8f4108271b3fb1ee.patch
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From 9efd93e20dd7789e4172ad6c8f4108271b3fb1ee Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
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Date: Thu, 4 Mar 2021 13:05:19 +0200
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Subject: [PATCH] matroskademux: Fix extraction of multichannel WavPack
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The old code had a couple of issues that all lead to potential memory
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safety bugs.
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- Use a constant for the Wavpack4Header size instead of using sizeof.
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It's written out into the data and not from the struct and who knows
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what special alignment/padding requirements some C compilers have.
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- gst_buffer_set_size() does not realloc the buffer when setting a
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bigger size than allocated, it only allows growing up to the maximum
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allocated size. Instead use a GstAdapter to collect all the blocks
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and take out everything at once in the end.
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- Check that enough data is actually available in the input and
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otherwise handle it an error in all cases instead of silently
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ignoring it.
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Among other things this fixes out of bounds writes because the code
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assumed gst_buffer_set_size() can grow the buffer and simply wrote after
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the end of the buffer.
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Thanks to Natalie Silvanovich for reporting.
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Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/859
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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/904>
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---
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gst/matroska/matroska-demux.c | 99 +++++++++++++++++++----------------
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gst/matroska/matroska-ids.h | 2 +
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2 files changed, 55 insertions(+), 46 deletions(-)
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diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
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index 4eb3d2a9f..f890ae611 100644
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--- a/gst/matroska/matroska-demux.c
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+++ b/gst/matroska/matroska-demux.c
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@@ -3706,6 +3706,12 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
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guint32 block_samples, tmp;
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gsize size = gst_buffer_get_size (*buf);
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+ if (size < 4) {
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+ GST_ERROR_OBJECT (element, "Too small wavpack buffer");
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+ gst_buffer_unmap (*buf, &map);
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+ return GST_FLOW_ERROR;
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+ }
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+
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gst_buffer_extract (*buf, 0, &tmp, sizeof (guint32));
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block_samples = GUINT32_FROM_LE (tmp);
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/* we need to reconstruct the header of the wavpack block */
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@@ -3713,10 +3719,10 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
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/* -20 because ck_size is the size of the wavpack block -8
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* and lace_size is the size of the wavpack block + 12
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* (the three guint32 of the header that already are in the buffer) */
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- wvh.ck_size = size + sizeof (Wavpack4Header) - 20;
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+ wvh.ck_size = size + WAVPACK4_HEADER_SIZE - 20;
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/* block_samples, flags and crc are already in the buffer */
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- newbuf = gst_buffer_new_allocate (NULL, sizeof (Wavpack4Header) - 12, NULL);
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+ newbuf = gst_buffer_new_allocate (NULL, WAVPACK4_HEADER_SIZE - 12, NULL);
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gst_buffer_map (newbuf, &outmap, GST_MAP_WRITE);
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data = outmap.data;
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@@ -3741,9 +3747,11 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
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audiocontext->wvpk_block_index += block_samples;
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} else {
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guint8 *outdata = NULL;
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- guint outpos = 0;
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- gsize buf_size, size, out_size = 0;
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+ gsize buf_size, size;
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guint32 block_samples, flags, crc, blocksize;
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+ GstAdapter *adapter;
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+
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+ adapter = gst_adapter_new ();
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gst_buffer_map (*buf, &map, GST_MAP_READ);
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buf_data = map.data;
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@@ -3752,6 +3760,7 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
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if (buf_size < 4) {
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GST_ERROR_OBJECT (element, "Too small wavpack buffer");
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gst_buffer_unmap (*buf, &map);
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+ g_object_unref (adapter);
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return GST_FLOW_ERROR;
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}
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@@ -3773,59 +3782,57 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
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data += 4;
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size -= 4;
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- if (blocksize == 0 || size < blocksize)
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- break;
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-
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- g_assert ((newbuf == NULL) == (outdata == NULL));
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+ if (blocksize == 0 || size < blocksize) {
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+ GST_ERROR_OBJECT (element, "Too small wavpack buffer");
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+ gst_buffer_unmap (*buf, &map);
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+ g_object_unref (adapter);
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+ return GST_FLOW_ERROR;
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+ }
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- if (newbuf == NULL) {
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- out_size = sizeof (Wavpack4Header) + blocksize;
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- newbuf = gst_buffer_new_allocate (NULL, out_size, NULL);
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+ g_assert (newbuf == NULL);
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- gst_buffer_copy_into (newbuf, *buf,
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- GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_FLAGS, 0, -1);
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+ newbuf =
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+ gst_buffer_new_allocate (NULL, WAVPACK4_HEADER_SIZE + blocksize,
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+ NULL);
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+ gst_buffer_map (newbuf, &outmap, GST_MAP_WRITE);
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+ outdata = outmap.data;
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+
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+ outdata[0] = 'w';
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+ outdata[1] = 'v';
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+ outdata[2] = 'p';
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+ outdata[3] = 'k';
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+ outdata += 4;
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+
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+ GST_WRITE_UINT32_LE (outdata, blocksize + WAVPACK4_HEADER_SIZE - 8);
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+ GST_WRITE_UINT16_LE (outdata + 4, wvh.version);
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+ GST_WRITE_UINT8 (outdata + 6, wvh.track_no);
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+ GST_WRITE_UINT8 (outdata + 7, wvh.index_no);
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+ GST_WRITE_UINT32_LE (outdata + 8, wvh.total_samples);
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+ GST_WRITE_UINT32_LE (outdata + 12, wvh.block_index);
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+ GST_WRITE_UINT32_LE (outdata + 16, block_samples);
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+ GST_WRITE_UINT32_LE (outdata + 20, flags);
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+ GST_WRITE_UINT32_LE (outdata + 24, crc);
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+ outdata += 28;
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+
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+ memcpy (outdata, data, blocksize);
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- outpos = 0;
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- gst_buffer_map (newbuf, &outmap, GST_MAP_WRITE);
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- outdata = outmap.data;
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- } else {
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- gst_buffer_unmap (newbuf, &outmap);
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- out_size += sizeof (Wavpack4Header) + blocksize;
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- gst_buffer_set_size (newbuf, out_size);
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- gst_buffer_map (newbuf, &outmap, GST_MAP_WRITE);
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- outdata = outmap.data;
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- }
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+ gst_buffer_unmap (newbuf, &outmap);
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+ gst_adapter_push (adapter, newbuf);
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+ newbuf = NULL;
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- outdata[outpos] = 'w';
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- outdata[outpos + 1] = 'v';
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- outdata[outpos + 2] = 'p';
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- outdata[outpos + 3] = 'k';
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- outpos += 4;
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-
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- GST_WRITE_UINT32_LE (outdata + outpos,
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- blocksize + sizeof (Wavpack4Header) - 8);
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- GST_WRITE_UINT16_LE (outdata + outpos + 4, wvh.version);
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- GST_WRITE_UINT8 (outdata + outpos + 6, wvh.track_no);
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- GST_WRITE_UINT8 (outdata + outpos + 7, wvh.index_no);
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- GST_WRITE_UINT32_LE (outdata + outpos + 8, wvh.total_samples);
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- GST_WRITE_UINT32_LE (outdata + outpos + 12, wvh.block_index);
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- GST_WRITE_UINT32_LE (outdata + outpos + 16, block_samples);
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- GST_WRITE_UINT32_LE (outdata + outpos + 20, flags);
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- GST_WRITE_UINT32_LE (outdata + outpos + 24, crc);
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- outpos += 28;
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-
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- memmove (outdata + outpos, data, blocksize);
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- outpos += blocksize;
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data += blocksize;
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size -= blocksize;
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}
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gst_buffer_unmap (*buf, &map);
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- gst_buffer_unref (*buf);
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- if (newbuf)
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- gst_buffer_unmap (newbuf, &outmap);
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+ newbuf = gst_adapter_take_buffer (adapter, gst_adapter_available (adapter));
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+ g_object_unref (adapter);
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+ gst_buffer_copy_into (newbuf, *buf,
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+ GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_FLAGS, 0, -1);
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+ gst_buffer_unref (*buf);
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*buf = newbuf;
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+
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audiocontext->wvpk_block_index += block_samples;
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}
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diff --git a/gst/matroska/matroska-ids.h b/gst/matroska/matroska-ids.h
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index 9b263d8a1..a0d68343f 100644
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--- a/gst/matroska/matroska-ids.h
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+++ b/gst/matroska/matroska-ids.h
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@@ -667,6 +667,8 @@ typedef struct _Wavpack4Header {
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guint32 crc; /* crc for actual decoded data */
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} Wavpack4Header;
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+#define WAVPACK4_HEADER_SIZE (32)
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+
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typedef enum {
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GST_MATROSKA_TRACK_ENCODING_SCOPE_FRAME = (1<<0),
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GST_MATROSKA_TRACK_ENCODING_SCOPE_CODEC_DATA = (1<<1),
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--
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GitLab
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38
d62cecf193d6bf3b16fe91d725f4514161f602c3.patch
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38
d62cecf193d6bf3b16fe91d725f4514161f602c3.patch
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@ -0,0 +1,38 @@
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From d62cecf193d6bf3b16fe91d725f4514161f602c3 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
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Date: Wed, 3 Mar 2021 11:31:52 +0200
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Subject: [PATCH] matroskademux: Initialize track context out parameter to NULL
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before parsing
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Various error return paths don't set it to NULL and callers are only
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checking if the pointer is NULL. As it's allocated on the stack this
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usually contains random stack memory, and more often than not the memory
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of a previously parsed track.
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This then causes all kinds of memory corruptions further down the line.
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Thanks to Natalie Silvanovich for reporting.
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Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/858
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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/904>
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---
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gst/matroska/matroska-demux.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
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index b2cd9b5d4..4eb3d2a9f 100644
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--- a/gst/matroska/matroska-demux.c
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+++ b/gst/matroska/matroska-demux.c
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@@ -660,6 +660,8 @@ gst_matroska_demux_parse_stream (GstMatroskaDemux * demux, GstEbmlRead * ebml,
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DEBUG_ELEMENT_START (demux, ebml, "TrackEntry");
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+ *dest_context = NULL;
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+
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/* start with the master */
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if ((ret = gst_ebml_read_master (ebml, &id)) != GST_FLOW_OK) {
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DEBUG_ELEMENT_STOP (demux, ebml, "TrackEntry", ret);
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--
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GitLab
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@ -15,7 +15,7 @@
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Name: gstreamer1-plugins-good
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Version: 1.16.1
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Release: 2%{?gitcommit:.git%{shortcommit}}%{?dist}
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Release: 3%{?gitcommit:.git%{shortcommit}}%{?dist}
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Summary: GStreamer plugins with good code and licensing
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License: LGPLv2+
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@ -29,6 +29,9 @@ Source0: gst-plugins-good-%{version}.tar.xz
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Source0: http://gstreamer.freedesktop.org/src/gst-plugins-good/gst-plugins-good-%{version}.tar.xz
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%endif
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Patch0: d62cecf193d6bf3b16fe91d725f4514161f602c3.patch
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Patch1: 9efd93e20dd7789e4172ad6c8f4108271b3fb1ee.patch
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BuildRequires: gcc
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BuildRequires: gcc-c++
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BuildRequires: gstreamer1-devel >= %{version}
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@ -161,6 +164,8 @@ to be installed.
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%prep
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%setup -q -n gst-plugins-good-%{version}
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%patch0 -p1
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%patch1 -p1
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%build
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%configure --disable-silent-rules --disable-fatal-warnings \
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@ -345,6 +350,10 @@ find $RPM_BUILD_ROOT -name '*.la' -exec rm -f {} ';'
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%changelog
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* Thu Jul 14 2022 Wim Taymans <wtaymans@redhat.com> - 1.16.1-3
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- Add patches for matroskademux. CVE-2021-3497
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- Resolves: rhbz#1948942
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* Wed Dec 9 2020 Wim Taymans <wtaymans@redhat.com> - 1.16.1-2
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- Suppress documentation in Flatpak builds
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- Resolves: rhbz#1895938
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