[Xen-devel] [PATCH v2 03/10] xen/pt: Check if reg->init function sets the 'data' past the reg->size

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

It should never happen, but in case it does (an developer adds
a new register and the 'init_val' expands past the register
size) we want to report. The code will only write up to
reg->size so there is no runtime danger of the register spilling
across other ones - however to catch this sort of thing
we still return an error.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 hw/xen/xen_pt_config_init.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index aff51b8..55be4ee 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -1912,9 +1912,15 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState 
*s,
         } else
             val = data;
 
+        if (val & ~size_mask) {
+            XEN_PT_ERR(&s->dev,"Offset 0x%04x:0x%04x expands past register 
size(%d)!\n",
+                       offset, val, reg->size);
+            g_free(reg_entry);
+            return -ENXIO;
+        }
         /* This could be just pci_set_long as we don't modify the bits
-         * past reg->size, but in case this routine is run in parallel
-         * we do not want to over-write other registers. */
+         * past reg->size, but in case this routine is run in parallel or the
+         * init value is larger, we do not want to over-write registers. */
         switch (reg->size) {
         case 1: pci_set_byte(s->dev.config + offset, (uint8_t)val);
                 break;
-- 
2.1.0


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