[Xen-devel] [PATCH 2/6] trace: fix T_INFO_FIRST_OFFSET

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

This wasn't defined correctly, thus allowing in the
num_online_cpus() == NR_CPUS case to pass a corrupted MFN to
Dom0.

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 11:58:37.000000000 +0200
@@ -51,7 +51,7 @@ static struct t_info *t_info;
 #define T_INFO_PAGES 2  /* Size fixed at 2 pages for now. */
 #define T_INFO_SIZE ((T_INFO_PAGES)*(PAGE_SIZE))
 /* t_info.tbuf_size + list of mfn offsets + 1 to round up / sizeof uint32_t */
-#define T_INFO_FIRST_OFFSET ((sizeof(int16_t) + NR_CPUS * sizeof(int16_t) + 1) 
/ sizeof(uint32_t))
+#define T_INFO_FIRST_OFFSET (((2 + NR_CPUS) * sizeof(uint16_t)) / 
sizeof(uint32_t))
 static DEFINE_PER_CPU_READ_MOSTLY(struct t_buf *, t_bufs);
 static DEFINE_PER_CPU_READ_MOSTLY(unsigned char *, t_data);
 static DEFINE_PER_CPU_READ_MOSTLY(spinlock_t, t_lock);

Attachment: trace-t_info-first-offset.patch
Description: Text document

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