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76 lines
3.0 KiB
Diff
76 lines
3.0 KiB
Diff
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From 6afca0fc5430db0300fe53f2b9cd7d071a3925bb Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Wed, 25 May 2011 00:46:55 +0200
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Subject: [PATCH 01/12] vmdk: fix endianness bugs
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The vmdk code is sloppy when handling the header descriptor during
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creation of an image. Fix all header accesses in the create path to
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either store native endianness or convert it when appropriate.
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Reported-by: Yury Tsarev <ytsarev@novell.com>
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Signed-off-by: Alexander Graf <agraf@suse.de>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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block/vmdk.c | 22 ++++++++++++++--------
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1 file changed, 14 insertions(+), 8 deletions(-)
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -716,11 +716,11 @@ static int vmdk_create(const char *filen
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return -errno;
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magic = cpu_to_be32(VMDK4_MAGIC);
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memset(&header, 0, sizeof(header));
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- header.version = cpu_to_le32(1);
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- header.flags = cpu_to_le32(3); /* ?? */
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- header.capacity = cpu_to_le64(total_size);
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- header.granularity = cpu_to_le64(128);
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- header.num_gtes_per_gte = cpu_to_le32(512);
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+ header.version = 1;
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+ header.flags = 3; /* ?? */
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+ header.capacity = total_size;
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+ header.granularity = 128;
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+ header.num_gtes_per_gte = 512;
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grains = (total_size + header.granularity - 1) / header.granularity;
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gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9;
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@@ -736,6 +736,12 @@ static int vmdk_create(const char *filen
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header.granularity - 1) / header.granularity) *
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header.granularity;
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+ /* swap endianness for all header fields */
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+ header.version = cpu_to_le32(header.version);
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+ header.flags = cpu_to_le32(header.flags);
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+ header.capacity = cpu_to_le64(header.capacity);
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+ header.granularity = cpu_to_le64(header.granularity);
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+ header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte);
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header.desc_offset = cpu_to_le64(header.desc_offset);
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header.desc_size = cpu_to_le64(header.desc_size);
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header.rgd_offset = cpu_to_le64(header.rgd_offset);
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@@ -759,7 +765,7 @@ static int vmdk_create(const char *filen
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goto exit;
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}
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- ret = ftruncate(fd, header.grain_offset << 9);
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+ ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
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if (ret < 0) {
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ret = -errno;
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goto exit;
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@@ -767,7 +773,7 @@ static int vmdk_create(const char *filen
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/* write grain directory */
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lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
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- for (i = 0, tmp = header.rgd_offset + gd_size;
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+ for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size;
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i < gt_count; i++, tmp += gt_size) {
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ret = qemu_write_full(fd, &tmp, sizeof(tmp));
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if (ret != sizeof(tmp)) {
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@@ -778,7 +784,7 @@ static int vmdk_create(const char *filen
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/* write backup grain directory */
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lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
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- for (i = 0, tmp = header.gd_offset + gd_size;
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+ for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size;
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i < gt_count; i++, tmp += gt_size) {
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ret = qemu_write_full(fd, &tmp, sizeof(tmp));
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if (ret != sizeof(tmp)) {
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