I added a new inline function "invalid_endianness" for better readability.
An invalid address now returns -EINVAL and triggers a WARN_ON().
If a more sophisticated check is wanted later on like a additional >0x0C
or something we can add this there on a central point.
If we will need it somewhere else in the future we can move it to a header.
This replaces the workaround patch sent with "libvirt status of bugt
racking regarding bad paddr (patch)".
FYI I attached the libvirt patch too
--
Grüsse / regards,
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization
+49 7031/16-3385
Ehrhardt@xxxxxxxxxxxxxxxxxx
Ehrhardt@xxxxxxxxxx
IBM Deutschland Entwicklung GmbH
Vorsitzender des Aufsichtsrats: Johann Weihen
Geschäftsführung: Herbert Kircher
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
diff -r 1139ab948449 arch/powerpc/platforms/xen/hcall.c
--- a/arch/powerpc/platforms/xen/hcall.c Sun Jul 15 15:33:56 2007 +0200
+++ b/arch/powerpc/platforms/xen/hcall.c Sun Aug 05 03:50:28 2007 +0200
@@ -437,6 +437,16 @@ out:
return ret;
}
+static inline int invalid_endianness(void *ptr)
+{
+ unsigned long p = (unsigned long)ptr;
+ if ( ((p & 0x00000000FFFFFFFFUL) == 0x0)
+ && ((p & 0xFFFFFFFF00000000UL) != 0x0) )
+ return 1;
+ else
+ return 0;
+}
+
static int xenppc_privcmd_sysctl(privcmd_hypercall_t *hypercall)
{
xen_sysctl_t kern_op;
@@ -481,6 +491,11 @@ static int xenppc_privcmd_sysctl(privcmd
printk(KERN_ERR "%s: unknown sysctl cmd %d\n", __func__,
kern_op.cmd);
return -ENOSYS;
case XEN_SYSCTL_getdomaininfolist:
+ if (invalid_endianness(kern_op.u.getdomaininfolist.buffer.p)) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
desc = xencomm_map(
xen_guest_handle(kern_op.u.getdomaininfolist.buffer),
kern_op.u.getdomaininfolist.max_domains *
diff -r 57c3b9568ea6 src/xen_internal.c
--- a/src/xen_internal.c Thu Jul 19 13:52:36 2007 +0200
+++ b/src/xen_internal.c Sun Aug 05 04:04:51 2007 +0200
@@ -314,10 +314,17 @@ struct xen_v2s3_getdomaininfolistop {
struct xen_v2s3_getdomaininfolistop {
domid_t first_domain;
uint32_t max_domains;
+#ifdef __BIG_ENDIAN__
+ struct {
+ int __pad[(sizeof (long long) - sizeof (struct xen_v2d5_getdomaininfo
*)) / sizeof (int)];
+ struct xen_v2d5_getdomaininfo *v;
+ } buffer;
+#else
union {
struct xen_v2d5_getdomaininfo *v;
uint64_t pad ALIGN_64;
} buffer;
+#endif
uint32_t num_domains;
};
typedef struct xen_v2s3_getdomaininfolistop xen_v2s3_getdomaininfolistop;
@@ -422,10 +429,17 @@ typedef struct xen_v2_setvcpumap xen_v2_
/* HV version 2, Dom version 5 requires 64-bit alignment */
struct xen_v2d5_cpumap {
+#ifdef __BIG_ENDIAN__
+ struct {
+ int __pad[(sizeof (long long) - sizeof (uint8_t *)) / sizeof (int)];
+ uint8_t *v;
+ } bitmap;
+#else
union {
uint8_t *v;
uint64_t pad ALIGN_64;
} bitmap;
+#endif
uint32_t nr_cpus;
};
struct xen_v2d5_setvcpumap {
_______________________________________________
Xen-ppc-devel mailing list
Xen-ppc-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ppc-devel
| 
Home