--- zzzz-none-000/linux-2.6.19.2/arch/i386/kernel/ptrace.c	2007-01-10 19:10:37.000000000 +0000
+++ davinci-8020-5504/linux-2.6.19.2/arch/i386/kernel/ptrace.c	2007-01-19 14:42:56.000000000 +0000
@@ -17,6 +17,7 @@
 #include <linux/audit.h>
 #include <linux/seccomp.h>
 #include <linux/signal.h>
+#include <linux/grsecurity.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -169,15 +170,15 @@
 	 * and APM bios ones we just ignore here.
 	 */
 	if (seg & LDT_SEGMENT) {
-		u32 *desc;
+		struct desc_struct *desc;
 		unsigned long base;
 
 		down(&child->mm->context.sem);
-		desc = child->mm->context.ldt + (seg & ~7);
-		base = (desc[0] >> 16) | ((desc[1] & 0xff) << 16) | (desc[1] & 0xff000000);
+		desc = &child->mm->context.ldt[seg >> 3];
+		base = (desc->a >> 16) | ((desc->b & 0xff) << 16) | (desc->b & 0xff000000);
 
 		/* 16-bit code segment? */
-		if (!((desc[1] >> 22) & 1))
+		if (!((desc->b >> 22) & 1))
 			addr &= 0xffff;
 		addr += base;
 		up(&child->mm->context.sem);
@@ -342,6 +343,11 @@
 	if (copy_from_user(&info, user_desc, sizeof(info)))
 		return -EFAULT;
 
+#ifdef CONFIG_PAX_SEGMEXEC
+	if ((child->mm->pax_flags & MF_PAX_SEGMEXEC) && (info.contents & MODIFY_LDT_CONTENTS_CODE))
+		return -EINVAL;
+#endif
+
 	if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
 		return -EINVAL;
 
@@ -432,6 +438,17 @@
 			  if(addr == (long) &dummy->u_debugreg[5]) break;
 			  if(addr < (long) &dummy->u_debugreg[4] &&
 			     ((unsigned long) data) >= TASK_SIZE-3) break;
+
+#ifdef CONFIG_GRKERNSEC
+			  if(addr >= (long) &dummy->u_debugreg[0] &&
+			     addr <= (long) &dummy->u_debugreg[3]){
+				long reg   = (addr - (long) &dummy->u_debugreg[0]) >> 2;
+				long type  = (child->thread.debugreg[7] >> (DR_CONTROL_SHIFT + 4*reg)) & 3;
+				long align = (child->thread.debugreg[7] >> (DR_CONTROL_SHIFT + 2 + 4*reg)) & 3;
+				if((type & 1) && (data & align))
+					break;
+			  }
+#endif
 			  
 			  /* Sanity-check data. Take one half-byte at once with
 			   * check = (val >> (16 + 4*i)) & 0xf. It contains the
@@ -648,7 +665,7 @@
 	info.si_code = TRAP_BRKPT;
 
 	/* User-mode eip? */
-	info.si_addr = user_mode_vm(regs) ? (void __user *) regs->eip : NULL;
+	info.si_addr = user_mode(regs) ? (void __user *) regs->eip : NULL;
 
 	/* Send us the fakey SIGTRAP */
 	force_sig_info(SIGTRAP, &info, tsk);