[Xen-devel] [PATCH 2/2] arm: kill a guest which uses hvc with an immediate operand != XEN_HYPERCALL_TAG

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

At best these guests are confused/broken and at worse they are malicious.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/traps.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 52ab943..50b62c0 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -472,11 +472,7 @@ static void do_trap_hypercall(struct cpu_user_regs *regs, 
unsigned long iss)
     arm_hypercall_fn_t call = NULL;
 
     if ( iss != XEN_HYPERCALL_TAG )
-    {
-        printk("%s %d: received an alien hypercall iss=%lx\n", __func__ ,
-                __LINE__ , iss);
-        regs->r0 = -EINVAL;
-    }
+        domain_crash_synchronous();
 
     if ( regs->r12 > ARRAY_SIZE(arm_hypercall_table) )
     {
-- 
1.7.9.1


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