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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 06/19] xen: use XSM instead of IS_PRIV where duplicated
The Xen hypervisor has two basic access control function calls: IS_PRIV
and the xsm_* functions. Most privileged operations currently require
that both checks succeed, and many times the checks are at different
locations in the code. This patch eliminates the explicit and implicit
IS_PRIV checks that are duplicated in XSM hooks.
When XSM_ENABLE is not defined or when the dummy XSM module is used,
this patch should not change any functionality. Because the locations of
privilege checks have sometimes moved below argument validation, error
returns of some functions may change from EPERM to EINVAL or ESRCH if
called with invalid arguments and from a domain without permission to
perform the operation.
Some checks are removed due to non-obvious duplicates in their callers:
* acpi_enter_sleep is checked in XENPF_enter_acpi_sleep
* map_domain_pirq has IS_PRIV_FOR checked in its callers:
* physdev_map_pirq checks when acquiring the RCU lock
* ioapic_guest_write is checked in PHYSDEVOP_apic_write
* PHYSDEVOP_{manage_pci_add,manage_pci_add_ext,pci_device_add} are
checked by xsm_resource_plug_pci in pci_add_device
* PHYSDEVOP_manage_pci_remove is checked by xsm_resource_unplug_pci
in pci_remove_device
* PHYSDEVOP_{restore_msi,restore_msi_ext} are checked by
xsm_resource_setup_pci in pci_restore_msi_state
* do_console_io has changed to IS_PRIV from an explicit domid==0
Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/acpi/power.c | 2 +-
xen/arch/x86/cpu/mcheck/mce.c | 3 ---
xen/arch/x86/irq.c | 3 +--
xen/arch/x86/mm.c | 3 ---
xen/arch/x86/physdev.c | 54 ++-----------------------------------------
xen/common/kexec.c | 3 ---
xen/common/schedule.c | 6 -----
xen/drivers/char/console.c | 6 -----
xen/include/xsm/dummy.h | 28 ++++++++++++++++++++++
xen/xsm/flask/hooks.c | 5 ++--
10 files changed, 35 insertions(+), 78 deletions(-)
diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index 9e1f989..c7b37ef 100644
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -238,7 +238,7 @@ static long enter_state_helper(void *data)
*/
int acpi_enter_sleep(struct xenpf_enter_acpi_sleep *sleep)
{
- if ( !IS_PRIV(current->domain) || !acpi_sinfo.pm1a_cnt_blk.address )
+ if ( !acpi_sinfo.pm1a_cnt_blk.address )
return -EPERM;
/* Sanity check */
diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c
index 8b54240..658774a 100644
--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -1293,9 +1293,6 @@ long do_mca(XEN_GUEST_HANDLE_PARAM(xen_mc_t) u_xen_mc)
struct xen_mc_msrinject *mc_msrinject;
struct xen_mc_mceinject *mc_mceinject;
- if (!IS_PRIV(v->domain) )
- return x86_mcerr(NULL, -EPERM);
-
ret = xsm_do_mca();
if ( ret )
return x86_mcerr(NULL, ret);
diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 05cede5..238600a 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -1853,8 +1853,7 @@ int map_domain_pirq(
ASSERT(spin_is_locked(&d->event_lock));
if ( !IS_PRIV(current->domain) &&
- !(IS_PRIV_FOR(current->domain, d) &&
- irq_access_permitted(current->domain, pirq)))
+ !irq_access_permitted(current->domain, pirq))
return -EPERM;
if ( pirq < 0 || pirq >= d->nr_pirqs || irq < 0 || irq >= nr_irqs )
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index fad3d33..9c90067 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4507,9 +4507,6 @@ long arch_memory_op(int op, XEN_GUEST_HANDLE_PARAM(void)
arg)
XEN_GUEST_HANDLE_PARAM(e820entry_t) buffer_param;
unsigned int i;
- if ( !IS_PRIV(current->domain) )
- return -EINVAL;
-
rc = xsm_machine_memory_map();
if ( rc )
return rc;
diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index 2928f1c..3f3ac0d 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -109,12 +109,6 @@ int physdev_map_pirq(domid_t domid, int type, int *index,
int *pirq_p,
if ( ret )
return ret;
- if ( !IS_PRIV_FOR(current->domain, d) )
- {
- ret = -EPERM;
- goto free_domain;
- }
-
/* Verify or get irq. */
switch ( type )
{
@@ -238,10 +232,6 @@ int physdev_unmap_pirq(domid_t domid, int pirq)
goto free_domain;
}
- ret = -EPERM;
- if ( !IS_PRIV_FOR(current->domain, d) )
- goto free_domain;
-
ret = xsm_unmap_domain_pirq(d, domain_pirq_to_irq(d, pirq));
if ( ret )
goto free_domain;
@@ -433,9 +423,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
ret = -EFAULT;
if ( copy_from_guest(&apic, arg, 1) != 0 )
break;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
ret = xsm_apic(v->domain, cmd);
if ( ret )
break;
@@ -450,9 +437,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
ret = -EFAULT;
if ( copy_from_guest(&apic, arg, 1) != 0 )
break;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
ret = xsm_apic(v->domain, cmd);
if ( ret )
break;
@@ -467,8 +451,8 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
if ( copy_from_guest(&irq_op, arg, 1) != 0 )
break;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
+ ret = xsm_apic(v->domain, cmd);
+ if ( ret )
break;
/* Vector is only used by hypervisor, and dom0 shouldn't
@@ -517,9 +501,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
case PHYSDEVOP_manage_pci_add: {
struct physdev_manage_pci manage_pci;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
ret = -EFAULT;
if ( copy_from_guest(&manage_pci, arg, 1) != 0 )
break;
@@ -530,9 +511,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
case PHYSDEVOP_manage_pci_remove: {
struct physdev_manage_pci manage_pci;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
ret = -EFAULT;
if ( copy_from_guest(&manage_pci, arg, 1) != 0 )
break;
@@ -545,10 +523,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct physdev_manage_pci_ext manage_pci_ext;
struct pci_dev_info pdev_info;
- ret = -EPERM;
- if ( !IS_PRIV(current->domain) )
- break;
-
ret = -EFAULT;
if ( copy_from_guest(&manage_pci_ext, arg, 1) != 0 )
break;
@@ -571,10 +545,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct physdev_pci_device_add add;
struct pci_dev_info pdev_info;
- ret = -EPERM;
- if ( !IS_PRIV(current->domain) )
- break;
-
ret = -EFAULT;
if ( copy_from_guest(&add, arg, 1) != 0 )
break;
@@ -595,10 +565,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
case PHYSDEVOP_pci_device_remove: {
struct physdev_pci_device dev;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
-
ret = -EFAULT;
if ( copy_from_guest(&dev, arg, 1) != 0 )
break;
@@ -610,10 +576,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
case PHYSDEVOP_pci_mmcfg_reserved: {
struct physdev_pci_mmcfg_reserved info;
- ret = -EPERM;
- if ( !IS_PRIV(current->domain) )
- break;
-
ret = xsm_resource_setup_misc();
if ( ret )
break;
@@ -631,10 +593,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct physdev_restore_msi restore_msi;
struct pci_dev *pdev;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
-
ret = -EFAULT;
if ( copy_from_guest(&restore_msi, arg, 1) != 0 )
break;
@@ -650,10 +608,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct physdev_pci_device dev;
struct pci_dev *pdev;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
-
ret = -EFAULT;
if ( copy_from_guest(&dev, arg, 1) != 0 )
break;
@@ -668,10 +622,6 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
case PHYSDEVOP_setup_gsi: {
struct physdev_setup_gsi setup_gsi;
- ret = -EPERM;
- if ( !IS_PRIV(v->domain) )
- break;
-
ret = -EFAULT;
if ( copy_from_guest(&setup_gsi, arg, 1) != 0 )
break;
diff --git a/xen/common/kexec.c b/xen/common/kexec.c
index 25ebd6a..d4f6332 100644
--- a/xen/common/kexec.c
+++ b/xen/common/kexec.c
@@ -852,9 +852,6 @@ static int do_kexec_op_internal(unsigned long op,
unsigned long flags;
int ret = -EINVAL;
- if ( !IS_PRIV(current->domain) )
- return -EPERM;
-
ret = xsm_kexec();
if ( ret )
return ret;
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 231e097..cfd173d 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -921,12 +921,6 @@ ret_t do_sched_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
if ( d == NULL )
break;
- if ( !IS_PRIV_FOR(current->domain, d) )
- {
- rcu_unlock_domain(d);
- return -EPERM;
- }
-
ret = xsm_schedop_shutdown(current->domain, d);
if ( ret )
{
diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index ff360fe..b2c3ee3 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -406,12 +406,6 @@ long do_console_io(int cmd, int count,
XEN_GUEST_HANDLE_PARAM(char) buffer)
long rc;
unsigned int idx, len;
-#ifndef VERBOSE
- /* Only domain 0 may access the emergency console. */
- if ( current->domain->domain_id != 0 )
- return -EPERM;
-#endif
-
rc = xsm_console_io(current->domain, cmd);
if ( rc )
return rc;
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index 264f44b..12b1508 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -161,6 +161,8 @@ static XSM_DEFAULT(int, pm_op) (void)
static XSM_DEFAULT(int, do_mca) (void)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
@@ -223,6 +225,10 @@ static XSM_DEFAULT(int, memory_stat_reservation) (struct
domain *d1, struct doma
static XSM_DEFAULT(int, console_io) (struct domain *d, int cmd)
{
+#ifndef VERBOSE
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
+#endif
return 0;
}
@@ -233,11 +239,15 @@ static XSM_DEFAULT(int, profile) (struct domain *d, int
op)
static XSM_DEFAULT(int, kexec) (void)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
static XSM_DEFAULT(int, schedop_shutdown) (struct domain *d1, struct domain
*d2)
{
+ if ( !IS_PRIV_FOR(d1, d2) )
+ return -EPERM;
return 0;
}
@@ -336,26 +346,36 @@ static XSM_DEFAULT(int, resource_unplug_core) (void)
static XSM_DEFAULT(int, resource_plug_pci) (uint32_t machine_bdf)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
static XSM_DEFAULT(int, resource_unplug_pci) (uint32_t machine_bdf)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
static XSM_DEFAULT(int, resource_setup_pci) (uint32_t machine_bdf)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
static XSM_DEFAULT(int, resource_setup_gsi) (int gsi)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
static XSM_DEFAULT(int, resource_setup_misc) (void)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
@@ -396,6 +416,8 @@ static XSM_DEFAULT(int, map_domain_pirq) (struct domain *d,
int irq, void *data)
static XSM_DEFAULT(int, unmap_domain_pirq) (struct domain *d, int irq)
{
+ if ( !IS_PRIV_FOR(current->domain, d) )
+ return -EPERM;
return 0;
}
@@ -494,6 +516,8 @@ static XSM_DEFAULT(int, mem_sharing) (struct domain *d)
static XSM_DEFAULT(int, apic) (struct domain *d, int cmd)
{
+ if ( !IS_PRIV(d) )
+ return -EPERM;
return 0;
}
@@ -534,6 +558,8 @@ static XSM_DEFAULT(int, efi_call) (void)
static XSM_DEFAULT(int, acpi_sleep) (void)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
@@ -549,6 +575,8 @@ static XSM_DEFAULT(int, getidletime) (void)
static XSM_DEFAULT(int, machine_memory_map) (void)
{
+ if ( !IS_PRIV(current->domain) )
+ return -EPERM;
return 0;
}
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 31572c5..cb8cf96 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -1147,10 +1147,11 @@ static int flask_apic(struct domain *d, int cmd)
switch ( cmd )
{
- case PHYSDEVOP_APIC_READ:
+ case PHYSDEVOP_apic_read:
+ case PHYSDEVOP_alloc_irq_vector:
perm = XEN__READAPIC;
break;
- case PHYSDEVOP_APIC_WRITE:
+ case PHYSDEVOP_apic_write:
perm = XEN__WRITEAPIC;
break;
default:
--
1.7.11.7
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