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From c85b3af7587973944c28b859dfefa91c21852971 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Tue, 6 Aug 2013 15:44:51 +0800
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Subject: [PATCH 05/13] vmdk: check granularity field in opening
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Message-id: <1377573001-27070-6-git-send-email-famz@redhat.com>
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Patchwork-id: 53785
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O-Subject: [RHEL-7 qemu-kvm PATCH 05/13] vmdk: check granularity field in opening
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Bugzilla: 995866
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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Granularity is used to calculate the cluster size and allocate r/w
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buffer. Check the value from image before using it, so we don't abort()
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for unbounded memory allocation.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 8aa1331c09a9b899f48d97f097bb49b7d458be1c)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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---
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 block/vmdk.c               |   40 +++++++++++++++++++++++++++++++---------
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 tests/qemu-iotests/059     |    8 +++++++-
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 tests/qemu-iotests/059.out |    6 ++++++
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 3 files changed, 44 insertions(+), 10 deletions(-)
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diff --git a/block/vmdk.c b/block/vmdk.c
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index 78ea480..8f59697 100644
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -385,15 +385,22 @@ static int vmdk_parent_open(BlockDriverState *bs)
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 /* Create and append extent to the extent array. Return the added VmdkExtent
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  * address. return NULL if allocation failed. */
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-static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
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+static int vmdk_add_extent(BlockDriverState *bs,
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                            BlockDriverState *file, bool flat, int64_t sectors,
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                            int64_t l1_offset, int64_t l1_backup_offset,
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                            uint32_t l1_size,
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-                           int l2_size, unsigned int cluster_sectors)
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+                           int l2_size, uint64_t cluster_sectors,
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+                           VmdkExtent **new_extent)
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 {
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     VmdkExtent *extent;
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     BDRVVmdkState *s = bs->opaque;
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+    if (cluster_sectors > 0x200000) {
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+        /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
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+        error_report("invalid granularity, image may be corrupt");
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+        return -EINVAL;
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+    }
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+
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     s->extents = g_realloc(s->extents,
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                               (s->num_extents + 1) * sizeof(VmdkExtent));
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     extent = &s->extents[s->num_extents];
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@@ -416,7 +423,10 @@ static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
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         extent->end_sector = extent->sectors;
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     }
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     bs->total_sectors = extent->end_sector;
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-    return extent;
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+    if (new_extent) {
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+        *new_extent = extent;
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+    }
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+    return 0;
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 }
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 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent)
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@@ -475,12 +485,17 @@ static int vmdk_open_vmdk3(BlockDriverState *bs,
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     if (ret < 0) {
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         return ret;
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     }
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-    extent = vmdk_add_extent(bs,
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+
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+    ret = vmdk_add_extent(bs,
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                              bs->file, false,
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                              le32_to_cpu(header.disk_sectors),
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                              le32_to_cpu(header.l1dir_offset) << 9,
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                              0, 1 << 6, 1 << 9,
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-                             le32_to_cpu(header.granularity));
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+                             le32_to_cpu(header.granularity),
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+                             &extent);
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+    if (ret < 0) {
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+        return ret;
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+    }
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     ret = vmdk_init_tables(bs, extent);
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     if (ret) {
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         /* free extent allocated by vmdk_add_extent */
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@@ -580,13 +595,17 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
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     if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
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         l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
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     }
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-    extent = vmdk_add_extent(bs, file, false,
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+    ret = vmdk_add_extent(bs, file, false,
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                           le64_to_cpu(header.capacity),
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                           le64_to_cpu(header.gd_offset) << 9,
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                           l1_backup_offset,
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                           l1_size,
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                           le32_to_cpu(header.num_gtes_per_gte),
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-                          le64_to_cpu(header.granularity));
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+                          le64_to_cpu(header.granularity),
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+                          &extent);
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+    if (ret < 0) {
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+        return ret;
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+    }
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     extent->compressed =
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         le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
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     extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
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@@ -702,8 +721,11 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
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             /* FLAT extent */
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             VmdkExtent *extent;
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-            extent = vmdk_add_extent(bs, extent_file, true, sectors,
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-                            0, 0, 0, 0, sectors);
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+            ret = vmdk_add_extent(bs, extent_file, true, sectors,
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+                            0, 0, 0, 0, sectors, &extent);
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+            if (ret < 0) {
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+                return ret;
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+            }
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             extent->flat_start_offset = flat_offset << 9;
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         } else if (!strcmp(type, "SPARSE")) {
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             /* SPARSE extent */
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diff --git a/tests/qemu-iotests/059 b/tests/qemu-iotests/059
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index 9dc7f64..9545e82 100755
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--- a/tests/qemu-iotests/059
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+++ b/tests/qemu-iotests/059
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@@ -43,7 +43,13 @@ _supported_fmt vmdk
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 _supported_proto generic
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 _supported_os Linux
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-granularity_offset=16
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+granularity_offset=20
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+
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+echo "=== Testing invalid granularity ==="
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+echo
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+_make_test_img 64M
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+poke_file "$TEST_IMG" "$granularity_offset" "\xff\xff\xff\xff\xff\xff\xff\xff"
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+{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
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 # success, all done
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 echo "*** done"
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diff --git a/tests/qemu-iotests/059.out b/tests/qemu-iotests/059.out
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index 4ca7f29..380ca3d 100644
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--- a/tests/qemu-iotests/059.out
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+++ b/tests/qemu-iotests/059.out
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@@ -1,2 +1,8 @@
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 QA output created by 059
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+=== Testing invalid granularity ===
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+
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+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
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+invalid granularity, image may be corrupt
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+qemu-io: can't open device TEST_DIR/t.vmdk
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+no file open, try 'help open'
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 *** done
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-- 
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1.7.1
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