This removes the unconditional #undef injected in response to such traps which
was added by the fixes to CVE-2014-5147 / XSA-102 in c0020e099702 "xen: arm:
Handle traps from 32-bit userspace on 64-bit kernel as undef", we now handle
such traps correctly.
Signed-off-by: Ian Campbell <ian.campb...@citrix.com>
---
xen/arch/arm/traps.c | 12 ------------
1 file changed, 12 deletions(-)
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index b6bed6d..474747e 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2089,18 +2089,6 @@ asmlinkage void do_trap_hypervisor(struct cpu_user_regs
*regs)
enter_hypervisor_head(regs);
- /*
- * We currently do not handle 32-bit userspace on 64-bit kernels
- * correctly (See XSA-102). Until that is resolved we treat any
- * trap from 32-bit userspace on 64-bit kernel as undefined.
- */
- if ( !hyp_mode(regs) && is_64bit_domain(current->domain) &&
- psr_mode_is_32bit(regs->cpsr) )
- {
- inject_undef_exception(regs, hsr.len);
- return;
- }
-
switch (hsr.ec) {
case HSR_EC_WFI_WFE:
if ( !check_conditional_instr(regs, hsr) )
--
1.7.10.4
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