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vmdk: fix endianness bugs

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The vmdk code is sloppy when handling the header descriptor during
creation of an image. Fix all header accesses in the create path to
either store native endianness or convert it when appropriate.

Reported-by: Yury Tsarev <ytsarev@novell.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alexander Graf 2011-05-25 00:46:55 +02:00 • committed by Kevin Wolf
parent a659979328
commit 16372ff03d
1 changed files with 14 additions and 8 deletions
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22
block/vmdk.c
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@ -716,11 +716,11 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
return -errno;
magic = cpu_to_be32(VMDK4_MAGIC);
memset(&header, 0, sizeof(header));
header.version = cpu_to_le32(1);
header.flags = cpu_to_le32(3); /* ?? */
header.capacity = cpu_to_le64(total_size);
header.granularity = cpu_to_le64(128);
header.num_gtes_per_gte = cpu_to_le32(512);
header.version = 1;
header.flags = 3; /* ?? */
header.capacity = total_size;
header.granularity = 128;
header.num_gtes_per_gte = 512;
grains = (total_size + header.granularity - 1) / header.granularity;
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9;
@ -736,6 +736,12 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
header.granularity - 1) / header.granularity) *
header.granularity;
/* swap endianness for all header fields */
header.version = cpu_to_le32(header.version);
header.flags = cpu_to_le32(header.flags);
header.capacity = cpu_to_le64(header.capacity);
header.granularity = cpu_to_le64(header.granularity);
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte);
header.desc_offset = cpu_to_le64(header.desc_offset);
header.desc_size = cpu_to_le64(header.desc_size);
header.rgd_offset = cpu_to_le64(header.rgd_offset);
@ -759,7 +765,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
goto exit;
}
ret = ftruncate(fd, header.grain_offset << 9);
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
if (ret < 0) {
ret = -errno;
goto exit;
@ -767,7 +773,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
/* write grain directory */
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
for (i = 0, tmp = header.rgd_offset + gd_size;
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size;
i < gt_count; i++, tmp += gt_size) {
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
if (ret != sizeof(tmp)) {
@ -778,7 +784,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
/* write backup grain directory */
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
for (i = 0, tmp = header.gd_offset + gd_size;
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size;
i < gt_count; i++, tmp += gt_size) {
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
if (ret != sizeof(tmp)) {