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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/tasklet: CFI hardening
commit 69f14d2ad9f7b23cdf2aad3b907b06c7f94cffab
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Oct 28 10:58:37 2021 +0100
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Feb 23 15:33:43 2022 +0000
xen/tasklet: CFI hardening
Control Flow Integrity schemes use toolchain and optionally hardware support
to help protect against call/jump/return oriented programming attacks.
Use cf_check to annotate function pointer targets for the toolchain.
The function pointer cast in hvm_vcpu_initialise() is undefined behaviour.
While it happens to function correctly, it is not compatible with control
flow
typechecking, so introduce a new hvm_assert_evtchn_irq_tasklet() to handle
the
parameter type conversion in a legal way.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/hvm/hvm.c | 7 ++++++-
xen/arch/x86/hvm/vlapic.c | 2 +-
xen/arch/x86/include/asm/shadow.h | 2 +-
xen/arch/x86/mm/shadow/common.c | 2 +-
xen/common/domain.c | 2 +-
xen/common/keyhandler.c | 6 +++---
xen/common/livepatch.c | 2 +-
xen/common/stop_machine.c | 2 +-
xen/common/trace.c | 2 +-
xen/drivers/char/console.c | 2 +-
xen/drivers/passthrough/amd/iommu_guest.c | 2 +-
xen/drivers/passthrough/amd/iommu_init.c | 4 ++--
xen/drivers/passthrough/vtd/iommu.c | 2 +-
13 files changed, 21 insertions(+), 16 deletions(-)
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 0a19353068..5ec10f3080 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1528,6 +1528,11 @@ static int __init cf_check
hvm_register_CPU_save_and_restore(void)
}
__initcall(hvm_register_CPU_save_and_restore);
+static void cf_check hvm_assert_evtchn_irq_tasklet(void *v)
+{
+ hvm_assert_evtchn_irq(v);
+}
+
int hvm_vcpu_initialise(struct vcpu *v)
{
int rc;
@@ -1552,7 +1557,7 @@ int hvm_vcpu_initialise(struct vcpu *v)
goto fail3;
softirq_tasklet_init(&v->arch.hvm.assert_evtchn_irq_tasklet,
- (void (*)(void *))hvm_assert_evtchn_irq, v);
+ hvm_assert_evtchn_irq_tasklet, v);
v->arch.hvm.inject_event.vector = HVM_EVENT_VECTOR_UNSET;
diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index b8c84458ff..fe375912be 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -312,7 +312,7 @@ static void vlapic_init_sipi_one(struct vcpu *target,
uint32_t icr)
vcpu_unpause(target);
}
-static void vlapic_init_sipi_action(void *data)
+static void cf_check vlapic_init_sipi_action(void *data)
{
struct vcpu *origin = data;
uint32_t icr = vcpu_vlapic(origin)->init_sipi.icr;
diff --git a/xen/arch/x86/include/asm/shadow.h
b/xen/arch/x86/include/asm/shadow.h
index e25f9604d8..7ef76cc063 100644
--- a/xen/arch/x86/include/asm/shadow.h
+++ b/xen/arch/x86/include/asm/shadow.h
@@ -233,7 +233,7 @@ static inline bool pv_l1tf_check_l4e(struct domain *d,
l4_pgentry_t l4e)
return pv_l1tf_check_pte(d, 4, l4e.l4);
}
-void pv_l1tf_tasklet(void *data);
+void cf_check pv_l1tf_tasklet(void *data);
static inline void pv_l1tf_domain_init(struct domain *d)
{
diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
index b8730a9441..fb370af90b 100644
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -3242,7 +3242,7 @@ void shadow_audit_tables(struct vcpu *v)
#ifdef CONFIG_PV
-void pv_l1tf_tasklet(void *data)
+void cf_check pv_l1tf_tasklet(void *data)
{
struct domain *d = data;
diff --git a/xen/common/domain.c b/xen/common/domain.c
index c5716cd72f..f3d06df76c 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1820,7 +1820,7 @@ struct migrate_info {
static DEFINE_PER_CPU(struct migrate_info *, continue_info);
-static void continue_hypercall_tasklet_handler(void *data)
+static void cf_check continue_hypercall_tasklet_handler(void *data)
{
struct migrate_info *info = data;
struct vcpu *v = info->vcpu;
diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 2c916d528a..b568484ca6 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -73,7 +73,7 @@ static struct keyhandler {
#undef KEYHANDLER
};
-static void keypress_action(void *unused)
+static void cf_check keypress_action(void *unused)
{
handle_keypress(keypress_key, NULL);
}
@@ -206,7 +206,7 @@ static void dump_registers(unsigned char key, struct
cpu_user_regs *regs)
static DECLARE_TASKLET(dump_hwdom_tasklet, NULL, NULL);
-static void dump_hwdom_action(void *data)
+static void cf_check dump_hwdom_action(void *data)
{
struct vcpu *v = data;
@@ -437,7 +437,7 @@ static void read_clocks(unsigned char key)
maxdif_cycles, sumdif_cycles/count, count, dif_cycles);
}
-static void run_all_nonirq_keyhandlers(void *unused)
+static void cf_check run_all_nonirq_keyhandlers(void *unused)
{
/* Fire all the non-IRQ-context diagnostic keyhandlers */
struct keyhandler *h;
diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 701efd87a1..4e1c29ab78 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -1591,7 +1591,7 @@ static int schedule_work(struct payload *data, uint32_t
cmd, uint32_t timeout)
return 0;
}
-static void tasklet_fn(void *unused)
+static void cf_check tasklet_fn(void *unused)
{
this_cpu(work_to_do) = 1;
}
diff --git a/xen/common/stop_machine.c b/xen/common/stop_machine.c
index a122bd4afe..3adbe380de 100644
--- a/xen/common/stop_machine.c
+++ b/xen/common/stop_machine.c
@@ -141,7 +141,7 @@ int stop_machine_run(int (*fn)(void *), void *data,
unsigned int cpu)
return ret;
}
-static void stopmachine_action(void *data)
+static void cf_check stopmachine_action(void *data)
{
unsigned int cpu = (unsigned long)data;
enum stopmachine_state state = STOPMACHINE_START;
diff --git a/xen/common/trace.c b/xen/common/trace.c
index b5358508f8..a7c092fcbb 100644
--- a/xen/common/trace.c
+++ b/xen/common/trace.c
@@ -663,7 +663,7 @@ static inline void insert_lost_records(struct t_buf *buf)
* Notification is performed in qtasklet to avoid deadlocks with contexts
* which __trace_var() may be called from (e.g., scheduler critical regions).
*/
-static void trace_notify_dom0(void *unused)
+static void cf_check trace_notify_dom0(void *unused)
{
send_global_virq(VIRQ_TBUF);
}
diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index 4694be83db..d74b65f6bf 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -574,7 +574,7 @@ static void serial_rx(char c, struct cpu_user_regs *regs)
__serial_rx(c, regs);
}
-static void notify_dom0_con_ring(void *unused)
+static void cf_check notify_dom0_con_ring(void *unused)
{
send_global_virq(VIRQ_CON_RING);
}
diff --git a/xen/drivers/passthrough/amd/iommu_guest.c
b/xen/drivers/passthrough/amd/iommu_guest.c
index 85828490ff..361ff864d8 100644
--- a/xen/drivers/passthrough/amd/iommu_guest.c
+++ b/xen/drivers/passthrough/amd/iommu_guest.c
@@ -456,7 +456,7 @@ static int do_invalidate_dte(struct domain *d, cmd_entry_t
*cmd)
return 0;
}
-static void guest_iommu_process_command(void *data)
+static void cf_check guest_iommu_process_command(void *data)
{
unsigned long opcode, tail, head, cmd_mfn;
cmd_entry_t *cmd;
diff --git a/xen/drivers/passthrough/amd/iommu_init.c
b/xen/drivers/passthrough/amd/iommu_init.c
index f1ed755582..34a9e49f1c 100644
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -26,7 +26,7 @@
static int __initdata nr_amd_iommus;
static bool __initdata pci_init;
-static void do_amd_iommu_irq(void *data);
+static void cf_check do_amd_iommu_irq(void *data);
static DECLARE_SOFTIRQ_TASKLET(amd_iommu_irq_tasklet, do_amd_iommu_irq, NULL);
unsigned int __read_mostly amd_iommu_acpi_info;
@@ -692,7 +692,7 @@ static void iommu_check_ppr_log(struct amd_iommu *iommu)
spin_unlock_irqrestore(&iommu->lock, flags);
}
-static void do_amd_iommu_irq(void *unused)
+static void cf_check do_amd_iommu_irq(void *unused)
{
struct amd_iommu *iommu;
diff --git a/xen/drivers/passthrough/vtd/iommu.c
b/xen/drivers/passthrough/vtd/iommu.c
index 6ed32922c4..42181e12be 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1049,7 +1049,7 @@ clear_overflow:
}
}
-static void do_iommu_page_fault(void *unused)
+static void cf_check do_iommu_page_fault(void *unused)
{
struct acpi_drhd_unit *drhd;
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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