1369de9828
CVE-2014-3689 vmware_vga: insufficient parameter validation in rectangle functions (bz #1153038, bz #1153035)
54 lines
1.8 KiB
Diff
54 lines
1.8 KiB
Diff
From: Kevin Wolf <kwolf@redhat.com>
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Date: Wed, 26 Mar 2014 13:05:33 +0100
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Subject: [PATCH] bochs: Check catalog_size header field (CVE-2014-0143)
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It should neither become negative nor allow unbounded memory
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allocations. This fixes aborts in g_malloc() and an s->catalog_bitmap
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buffer overflow on big endian hosts.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit e3737b820b45e54b059656dc3f914f895ac7a88b)
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Conflicts:
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tests/qemu-iotests/078
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tests/qemu-iotests/078.out
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---
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block/bochs.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/block/bochs.c b/block/bochs.c
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index 750cec0..4393ecc 100644
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--- a/block/bochs.c
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+++ b/block/bochs.c
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@@ -121,7 +121,14 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags)
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bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512;
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}
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+ /* Limit to 1M entries to avoid unbounded allocation. This is what is
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+ * needed for the largest image that bximage can create (~8 TB). */
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s->catalog_size = le32_to_cpu(bochs.catalog);
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+ if (s->catalog_size > 0x100000) {
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+ fprintf(stderr, "Catalog size is too large");
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+ return -EFBIG;
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+ }
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+
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s->catalog_bitmap = g_malloc(s->catalog_size * 4);
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ret = bdrv_pread(bs->file, le32_to_cpu(bochs.header), s->catalog_bitmap,
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@@ -140,6 +147,12 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags)
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s->extent_size = le32_to_cpu(bochs.extent);
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+ if (s->catalog_size < bs->total_sectors / s->extent_size) {
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+ fprintf(stderr, "Catalog size is too small for this disk size");
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+ ret = -EINVAL;
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+ goto fail;
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+ }
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+
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qemu_co_mutex_init(&s->lock);
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return 0;
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