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kvm: Fail if user specifies a QCOW disk image

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Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:41 +01:00
committed by Will Deacon
parent e907b83f28
commit 5646450daa
1 changed files with 17 additions and 0 deletions
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disk-image.c
+17
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@@ -6,6 +6,7 @@
#include <inttypes.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
@@ -14,6 +15,19 @@
#define SECTOR_SHIFT 9
#define SECTOR_SIZE (1UL << SECTOR_SHIFT)
static const char QCOW_MAGIC[] = { 'Q', 'F', 'I', 0xfb };
struct qcow_header {
uint8_t magic[5];
};
static bool disk_image__is_qcow(struct disk_image *self)
{
struct qcow_header *header = self->mmap;
return !memcmp(header->magic, QCOW_MAGIC, ARRAY_SIZE(QCOW_MAGIC));
}
struct disk_image *disk_image__open(const char *filename)
{
struct disk_image *self;
@@ -36,6 +50,9 @@ struct disk_image *disk_image__open(const char *filename)
if (self->mmap == MAP_FAILED)
goto failed_close_fd;
if (disk_image__is_qcow(self))
die("QCOW disk image format is not supported.");
return self;
failed_close_fd: