File xen.7a46badcf4eaa337070a6e7dda61698fd5a32cb3.patch of Package xen

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File xen.7a46badcf4eaa337070a6e7dda61698fd5a32cb3.patch of Package xen (Revision 9c85a36e5d114c8038b820a72e545168)

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From: Jan Beulich <jbeulich@suse.com>
Date: Fri, 9 Jun 2017 13:58:11 +0200
Subject: 7a46badcf4eaa337070a6e7dda61698fd5a32cb3

x86: fix build with gcc 7

-Wint-in-bool-context, enabled by default in gcc 7, doesn't like
multiplication in conditional operators. "Hide" them, at the risk of
the next compiler version becoming smarter and recognizing even those.
(The hope is that added smartness then would also better deal with
legitimate cases like the ones here.)

The change could have been done in access_ok(), but I think we better
keep it at the places the compiler is actually unhappy about.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: f32400e90c046a9fd76c8917a60d34ade9c02ea2
master date: 2017-05-19 10:11:36 +0200
---
 xen/arch/x86/traps.c                 | 4 ++--
 xen/include/asm-x86/x86_64/uaccess.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -3007,44 +3007,44 @@ static void emulate_gate_op(struct cpu_user_regs *regs)
                 regs->error_code = ss & ~3;
                 do_guest_trap(TRAP_invalid_tss, regs, 1);
                 return;
             }
             if ( !(ar & _SEGMENT_P) ||
                  !check_stack_limit(ar, limit, esp, (4 + nparm) * 4) )
             {
                 regs->error_code = ss & ~3;
                 do_guest_trap(TRAP_stack_error, regs, 1);
                 return;
             }
             stkp = (unsigned int *)(unsigned long)((unsigned int)base + esp);
-            if ( !compat_access_ok(stkp - 4 - nparm, (4 + nparm) * 4) )
+            if ( !compat_access_ok(stkp - 4 - nparm, 16 + nparm * 4) )
             {
                 do_guest_trap(TRAP_gp_fault, regs, 1);
                 return;
             }
             push(regs->ss);
             push(regs->esp);
             if ( nparm )
             {
                 const unsigned int *ustkp;
 
                 if ( !read_descriptor(regs->ss, v, regs, &base, &limit, &ar, 0) ||
                      ((ar >> 13) & 3) != (regs->cs & 3) ||
                      !(ar & _SEGMENT_S) ||
                      (ar & _SEGMENT_CODE) ||
                      !(ar & _SEGMENT_WR) ||
                      !check_stack_limit(ar, limit, esp + nparm * 4, nparm * 4) )
                     return do_guest_trap(TRAP_gp_fault, regs, 1);
                 ustkp = (unsigned int *)(unsigned long)((unsigned int)base + regs->_esp + nparm * 4);
-                if ( !compat_access_ok(ustkp - nparm, nparm * 4) )
+                if ( !compat_access_ok(ustkp - nparm, 0 + nparm * 4) )
                 {
                     do_guest_trap(TRAP_gp_fault, regs, 1);
                     return;
                 }
                 do
                 {
                     unsigned int parm;
 
                     --ustkp;
                     rc = __get_user(parm, ustkp);
                     if ( rc )
                     {
--- a/xen/include/asm-x86/x86_64/uaccess.h
+++ b/xen/include/asm-x86/x86_64/uaccess.h
@@ -46,25 +46,25 @@ extern void *xlat_malloc(unsigned long *xlat_page_current, size_t size);
 
 #define __compat_addr_ok(d, addr) \
     ((unsigned long)(addr) < HYPERVISOR_COMPAT_VIRT_START(d))
 
 #define __compat_access_ok(d, addr, size) \
     __compat_addr_ok(d, (unsigned long)(addr) + ((size) ? (size) - 1 : 0))
 
 #define compat_access_ok(addr, size) \
     __compat_access_ok(current->domain, addr, size)
 
 #define compat_array_access_ok(addr,count,size) \
     (likely((count) < (~0U / (size))) && \
-     compat_access_ok(addr, (count) * (size)))
+     compat_access_ok(addr, 0 + (count) * (size)))
 
 #define __put_user_size(x,ptr,size,retval,errret)			\
 do {									\
 	retval = 0;							\
 	switch (size) {							\
 	case 1: __put_user_asm(x,ptr,retval,"b","b","iq",errret);break;	\
 	case 2: __put_user_asm(x,ptr,retval,"w","w","ir",errret);break; \
 	case 4: __put_user_asm(x,ptr,retval,"l","k","ir",errret);break;	\
 	case 8: __put_user_asm(x,ptr,retval,"q","","ir",errret);break;	\
 	default: __put_user_bad();					\
 	}								\
 } while (0)

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File xen.7a46badcf4eaa337070a6e7dda61698fd5a32cb3.patch of Package xen (Revision 9c85a36e5d114c8038b820a72e545168)

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