[xen staging] x86/logdirty: CFI hardening

[patchbot@xxxxxxx]

commit 82081d6ef72b287d7e41807f50f070e0ebd408fe
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Oct 29 17:35:26 2021 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Feb 23 15:33:43 2022 +0000

    x86/logdirty: 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.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/mm/hap/hap.c       |  6 +++---
 xen/arch/x86/mm/shadow/common.c | 12 ++++++------
 xen/arch/x86/mm/shadow/none.c   |  6 +++---
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index de4b13565a..ed5112b00b 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -180,7 +180,7 @@ out:
  * NB: Domain that having device assigned should not set log_global. Because
  * there is no way to track the memory updating from device.
  */
-static int hap_enable_log_dirty(struct domain *d, bool_t log_global)
+static int cf_check hap_enable_log_dirty(struct domain *d, bool log_global)
 {
     struct p2m_domain *p2m = p2m_get_hostp2m(d);
 
@@ -211,7 +211,7 @@ static int hap_enable_log_dirty(struct domain *d, bool_t 
log_global)
     return 0;
 }
 
-static int hap_disable_log_dirty(struct domain *d)
+static int cf_check hap_disable_log_dirty(struct domain *d)
 {
     paging_lock(d);
     d->arch.paging.mode &= ~PG_log_dirty;
@@ -228,7 +228,7 @@ static int hap_disable_log_dirty(struct domain *d)
     return 0;
 }
 
-static void hap_clean_dirty_bitmap(struct domain *d)
+static void cf_check hap_clean_dirty_bitmap(struct domain *d)
 {
     /*
      * Switch to log-dirty mode, either by setting l1e entries of P2M table to
diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
index 83dedc8870..071a19adce 100644
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -40,9 +40,9 @@
 
 DEFINE_PER_CPU(uint32_t,trace_shadow_path_flags);
 
-static int sh_enable_log_dirty(struct domain *, bool log_global);
-static int sh_disable_log_dirty(struct domain *);
-static void sh_clean_dirty_bitmap(struct domain *);
+static int cf_check sh_enable_log_dirty(struct domain *, bool log_global);
+static int cf_check sh_disable_log_dirty(struct domain *);
+static void cf_check sh_clean_dirty_bitmap(struct domain *);
 
 /* Set up the shadow-specific parts of a domain struct at start of day.
  * Called for every domain from arch_domain_create() */
@@ -3016,7 +3016,7 @@ static int shadow_test_disable(struct domain *d)
 /* Shadow specific code which is called in paging_log_dirty_enable().
  * Return 0 if no problem found.
  */
-static int sh_enable_log_dirty(struct domain *d, bool log_global)
+static int cf_check sh_enable_log_dirty(struct domain *d, bool log_global)
 {
     int ret;
 
@@ -3044,7 +3044,7 @@ static int sh_enable_log_dirty(struct domain *d, bool 
log_global)
 }
 
 /* shadow specfic code which is called in paging_log_dirty_disable() */
-static int sh_disable_log_dirty(struct domain *d)
+static int cf_check sh_disable_log_dirty(struct domain *d)
 {
     int ret;
 
@@ -3058,7 +3058,7 @@ static int sh_disable_log_dirty(struct domain *d)
 /* This function is called when we CLEAN log dirty bitmap. See
  * paging_log_dirty_op() for details.
  */
-static void sh_clean_dirty_bitmap(struct domain *d)
+static void cf_check sh_clean_dirty_bitmap(struct domain *d)
 {
     paging_lock(d);
     /* Need to revoke write access to the domain's pages again.
diff --git a/xen/arch/x86/mm/shadow/none.c b/xen/arch/x86/mm/shadow/none.c
index 79889b926a..463a0e3e89 100644
--- a/xen/arch/x86/mm/shadow/none.c
+++ b/xen/arch/x86/mm/shadow/none.c
@@ -1,19 +1,19 @@
 #include <xen/mm.h>
 #include <asm/shadow.h>
 
-static int _enable_log_dirty(struct domain *d, bool log_global)
+static int cf_check _enable_log_dirty(struct domain *d, bool log_global)
 {
     ASSERT(is_pv_domain(d));
     return -EOPNOTSUPP;
 }
 
-static int _disable_log_dirty(struct domain *d)
+static int cf_check _disable_log_dirty(struct domain *d)
 {
     ASSERT(is_pv_domain(d));
     return -EOPNOTSUPP;
 }
 
-static void _clean_dirty_bitmap(struct domain *d)
+static void cf_check _clean_dirty_bitmap(struct domain *d)
 {
     ASSERT(is_pv_domain(d));
 }
--
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