File 6617d62c-x86-hvm-Misra-Rule-19-1-regression.patch of Package xen

Overview Repositories Revisions Requests Users Attributes Meta

File 6617d62c-x86-hvm-Misra-Rule-19-1-regression.patch of Package xen (Revision 8ecd76cd8fae452c9d5356192cb2de03)

Currently displaying revision 8ecd76cd8fae452c9d5356192cb2de03 , Show latest

# Commit d0a718a45f14b86471d8eb3083acd72760963470
# Date 2024-04-11 13:23:08 +0100
# Author Andrew Cooper <andrew.cooper3@citrix.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
x86/hvm: Fix Misra Rule 19.1 regression

Despite noticing an impending Rule 19.1 violation, the adjustment made (the
uint32_t cast) wasn't sufficient to avoid it.  Try again.

Subsequently noticed by Coverity too.

Fixes: 6a98383b0877 ("x86/HVM: clear upper halves of GPRs upon entry from 32-bit code")
Coverity-IDs: 1596289 thru 1596298
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

--- a/xen/arch/x86/include/asm/hvm/hvm.h
+++ b/xen/arch/x86/include/asm/hvm/hvm.h
@@ -585,16 +585,16 @@ static inline void hvm_sanitize_regs_fie
     if ( compat )
     {
         /* Clear GPR upper halves, to counteract guests playing games. */
-        regs->rbp = (uint32_t)regs->ebp;
-        regs->rbx = (uint32_t)regs->ebx;
-        regs->rax = (uint32_t)regs->eax;
-        regs->rcx = (uint32_t)regs->ecx;
-        regs->rdx = (uint32_t)regs->edx;
-        regs->rsi = (uint32_t)regs->esi;
-        regs->rdi = (uint32_t)regs->edi;
-        regs->rip = (uint32_t)regs->eip;
-        regs->rflags = (uint32_t)regs->eflags;
-        regs->rsp = (uint32_t)regs->esp;
+        regs->rbp = (uint32_t)regs->rbp;
+        regs->rbx = (uint32_t)regs->rbx;
+        regs->rax = (uint32_t)regs->rax;
+        regs->rcx = (uint32_t)regs->rcx;
+        regs->rdx = (uint32_t)regs->rdx;
+        regs->rsi = (uint32_t)regs->rsi;
+        regs->rdi = (uint32_t)regs->rdi;
+        regs->rip = (uint32_t)regs->rip;
+        regs->rflags = (uint32_t)regs->rflags;
+        regs->rsp = (uint32_t)regs->rsp;
     }
 
 #ifndef NDEBUG

Places

File 6617d62c-x86-hvm-Misra-Rule-19-1-regression.patch of Package xen (Revision 8ecd76cd8fae452c9d5356192cb2de03)

Places