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charset="utf-8" access_ok() is not be applicable here; we really only want a linear address check for breakpoint addresses, as putting those in debug register isn't going to result in actual memory accesses. Furthermore access_ok() assumes to be acting on current, which isn't the case here when called from arch_set_info_guest(). Note that access_ok() was too lax anyway for 32-bit domains. Signed-off-by: Jan Beulich --- The questionable use of sizeof(long) is left in place for the moment, as it's not clear how to best deal with the upper bound of breakpoint covered ranges: We'd like those to not cover Xen space. --- a/xen/arch/x86/pv/misc-hypercalls.c +++ b/xen/arch/x86/pv/misc-hypercalls.c @@ -60,7 +60,10 @@ long set_debugreg(struct vcpu *v, unsign switch ( reg ) { case 0 ... 3: - if ( !access_ok(value, sizeof(long)) ) + if ( is_pv_32bit_vcpu(v) + ? value + sizeof(long) > HYPERVISOR_COMPAT_VIRT_START(v->doma= in) + : value + sizeof(long) > (1UL << (VADDR_BITS - 1)) && + value < HYPERVISOR_VIRT_END ) return -EPERM; =20 v->arch.dr[reg] =3D value;