xnu-792.25.20.tar.gz

[apple/xnu.git] / bsd / kern / bsd_stubs.c

diff --git a/bsd/kern/bsd_stubs.c b/bsd/kern/bsd_stubs.c
index 9a0c0605408911d19d8620051ec8c33f3420adb5..0e885c2ae56e6d792c03d069165ad69f503a2679 100644 (file)
--- a/bsd/kern/bsd_stubs.c
+++ b/bsd/kern/bsd_stubs.c
@@ -31,6 +31,8 @@
 #include <sys/proc_internal.h>
 #include <sys/buf.h>   /* for SET */
 #include <sys/user.h>
+#include <sys/sysent.h>
+#include <sys/sysproto.h>
 
 /* Just to satisfy pstat command */
 int     dmmin, dmmax, dmtext;
@@ -41,7 +43,7 @@ kmem_mb_alloc(vm_map_t  mbmap, int size)
         vm_offset_t addr;
        if (kernel_memory_allocate(mbmap, &addr, size,
                0,
-               KMA_NOPAGEWAIT|KMA_KOBJECT) == KERN_SUCCESS)
+               KMA_NOPAGEWAIT|KMA_KOBJECT|KMA_LOMEM) == KERN_SUCCESS)
                        return(addr);
        else
                return(0);
@@ -292,3 +294,66 @@ tbeproc(void *procp)
        return;
 }
 
+
+/* 
+ * WARNING - this is a temporary workaround for binary compatibility issues
+ * with anti-piracy software that relies on patching ptrace (3928003).
+ * This KPI will be removed in the system release after Tiger.
+ */
+uintptr_t temp_patch_ptrace(uintptr_t new_ptrace)
+{
+       struct sysent *         callp;
+       sy_call_t *                     old_ptrace;
+#ifndef __ppc__
+       boolean_t       funnel_state;
+#endif
+
+       if (new_ptrace == 0)
+               return(0);
+               
+#ifdef __ppc__
+       enter_funnel_section(kernel_flock);
+#else
+       funnel_state = thread_funnel_set(kernel_flock, TRUE);
+#endif
+       callp = &sysent[26];
+       old_ptrace = callp->sy_call;
+       
+       /* only allow one patcher of ptrace */
+       if (old_ptrace == (sy_call_t *) ptrace) {
+               callp->sy_call = (sy_call_t *) new_ptrace;
+       }
+       else {
+               old_ptrace = NULL;
+       }
+#ifdef __ppc__
+       exit_funnel_section( );
+#else
+       (void)thread_funnel_set(kernel_flock, funnel_state);
+#endif
+       
+       return((uintptr_t)old_ptrace);
+}
+
+void temp_unpatch_ptrace(void)
+{
+       struct sysent *         callp;
+#ifndef __ppc__
+       boolean_t       funnel_state;
+#endif
+               
+#ifdef __ppc__
+       enter_funnel_section(kernel_flock);
+#else
+       funnel_state = thread_funnel_set(kernel_flock, TRUE);
+#endif
+       callp = &sysent[26];
+       callp->sy_call = (sy_call_t *) ptrace;
+#ifdef __ppc__
+       exit_funnel_section( );
+#else
+       (void)thread_funnel_set(kernel_flock, funnel_state);
+#endif
+       
+       return;
+}