@@ -108,14 +108,14 @@ dbg_pv_va2mfn(dbgva_t vaddr, struct doma
}
/* Returns: number of bytes remaining to be copied */
-static unsigned int dbg_rw_guest_mem(struct domain *dp, void * __user gaddr,
- void * __user buf, unsigned int len,
- bool toaddr, uint64_t pgd3)
+static unsigned int dbg_rw_guest_mem(struct domain *dp, unsigned long addr,
+ XEN_GUEST_HANDLE_PARAM(void) buf,
+ unsigned int len, bool toaddr,
+ uint64_t pgd3)
{
while ( len > 0 )
{
char *va;
- unsigned long addr = (unsigned long)gaddr;
mfn_t mfn;
gfn_t gfn = INVALID_GFN;
unsigned long pagecnt;
@@ -133,20 +133,18 @@ static unsigned int dbg_rw_guest_mem(str
if ( toaddr )
{
- copy_from_user(va, buf, pagecnt); /* va = buf */
+ copy_from_guest(va, buf, pagecnt);
paging_mark_dirty(dp, mfn);
}
else
- {
- copy_to_user(buf, va, pagecnt); /* buf = va */
- }
+ copy_to_guest(buf, va, pagecnt);
unmap_domain_page(va);
if ( !gfn_eq(gfn, INVALID_GFN) )
put_gfn(dp, gfn_x(gfn));
addr += pagecnt;
- buf += pagecnt;
+ guest_handle_add_offset(buf, pagecnt);
len -= pagecnt;
}
@@ -160,7 +158,7 @@ static unsigned int dbg_rw_guest_mem(str
* pgd3: value of init_mm.pgd[3] in guest. see above.
* Returns: number of bytes remaining to be copied.
*/
-unsigned int dbg_rw_mem(void * __user addr, void * __user buf,
+unsigned int dbg_rw_mem(unsigned long gva, XEN_GUEST_HANDLE_PARAM(void) buf,
unsigned int len, domid_t domid, bool toaddr,
uint64_t pgd3)
{
@@ -169,7 +167,7 @@ unsigned int dbg_rw_mem(void * __user ad
if ( d )
{
if ( !d->is_dying )
- len = dbg_rw_guest_mem(d, addr, buf, len, toaddr, pgd3);
+ len = dbg_rw_guest_mem(d, gva, buf, len, toaddr, pgd3);
rcu_unlock_domain(d);
}
@@ -40,10 +40,8 @@
#ifdef CONFIG_GDBSX
static int gdbsx_guest_mem_io(domid_t domid, struct xen_domctl_gdbsx_memio *iop)
{
- void * __user gva = (void *)iop->gva, * __user uva = (void *)iop->uva;
-
- iop->remain = dbg_rw_mem(gva, uva, iop->len, domid,
- !!iop->gwr, iop->pgd3val);
+ iop->remain = dbg_rw_mem(iop->gva, guest_handle_from_ptr(iop->uva, void),
+ iop->len, domid, iop->gwr, iop->pgd3val);
return iop->remain ? -EFAULT : 0;
}
@@ -93,9 +93,9 @@ static inline bool debugger_trap_entry(
#endif
#ifdef CONFIG_GDBSX
-unsigned int dbg_rw_mem(void * __user addr, void * __user buf,
+unsigned int dbg_rw_mem(unsigned long gva, XEN_GUEST_HANDLE_PARAM(void) buf,
unsigned int len, domid_t domid, bool toaddr,
- uint64_t pgd3);
+ unsigned long pgd3);
#endif
#endif /* __X86_DEBUGGER_H__ */
Using copy_{from,to}_user(), this code was assuming to be called only by PV guests. Use copy_{from,to}_guest() instead, transforming the incoming structure field into a guest handle (the field should really have been one in the first place). Also do not transform the debuggee address into a pointer. As a not originally intended side effect this also fixes a bug in dbg_rw_guest_mem(): At the end of the loop "addr" was incremented, but then in the next loop iteration (with the variable also having gone out of scope inbetween) re-initialized from the function parameter. Signed-off-by: Jan Beulich <jbeulich@suse.com>