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[Xen-devel] [PATCH] restrict trace buffer MFNs
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] restrict trace buffer MFNs |
| From: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
| Date: | Mon, 28 Jun 2010 11:42:13 +0100 |
| Delivery-date: | Mon, 28 Jun 2010 03:42:55 -0700 |
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Since they're being passed to Dom0 using an array of uint32_t, they
must be representable as 32-bit quantities, and hence the buffer
allocation must specify an upper address boundary.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2010-06-15.orig/xen/common/trace.c 2010-06-28 11:58:37.000000000 +0200
+++ 2010-06-15/xen/common/trace.c 2010-06-28 12:16:05.000000000 +0200
@@ -130,7 +130,8 @@ static int alloc_trace_bufs(void)
char *rawbuf;
struct t_buf *buf;
- if ( (rawbuf = alloc_xenheap_pages(order, 0)) == NULL )
+ if ( (rawbuf = alloc_xenheap_pages(
+ order, MEMF_bits(32 + PAGE_SHIFT))) == NULL )
{
printk("Xen trace buffers: memory allocation failed\n");
opt_tbuf_size = 0;
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