---

yaml --- r: 80553 b: refs/heads/master c: 35f3266 h: refs/heads/master i: 80551: 69537ef v: v3
git-mirror · Jan 30, 2008 · 1cc3b69 · 1cc3b69
1 parent b963082
commit 1cc3b69
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Showing 3 changed files with 37 additions and 9 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 29caf2f98cdb266dffb50dfd412f951e8d46f719
+refs/heads/master: 35f3266ffbee7ff8ca0474dc8dfa3b73d5a1d1ef
diff --git a/trunk/arch/x86/mm/fault_32.c b/trunk/arch/x86/mm/fault_32.c
@@ -286,6 +286,22 @@ static int is_errata93(struct pt_regs *regs, unsigned long address)
 	return 0;
 }
 
+/*
+ * Work around K8 erratum #100 K8 in compat mode occasionally jumps to illegal
+ * addresses >4GB.  We catch this in the page fault handler because these
+ * addresses are not reachable. Just detect this case and return.  Any code
+ * segment in LDT is compatibility mode.
+ */
+static int is_errata100(struct pt_regs *regs, unsigned long address)
+{
+#ifdef CONFIG_X86_64
+	if ((regs->cs == __USER32_CS || (regs->cs & (1<<2))) &&
+	    (address >> 32))
+		return 1;
+#endif
+	return 0;
+}
+
 void do_invalid_op(struct pt_regs *, unsigned long);
 
 static int is_f00f_bug(struct pt_regs *regs, unsigned long address)
@@ -566,6 +582,9 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
 		if (is_prefetch(regs, address, error_code))
 			return;
 
+		if (is_errata100(regs, address))
+			return;
+
 		if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
 		    printk_ratelimit()) {
 			printk(

diff --git a/trunk/arch/x86/mm/fault_64.c b/trunk/arch/x86/mm/fault_64.c
@@ -256,6 +256,22 @@ static int is_errata93(struct pt_regs *regs, unsigned long address)
 	return 0;
 }
 
+/*
+ * Work around K8 erratum #100 K8 in compat mode occasionally jumps to illegal
+ * addresses >4GB.  We catch this in the page fault handler because these
+ * addresses are not reachable. Just detect this case and return.  Any code
+ * segment in LDT is compatibility mode.
+ */
+static int is_errata100(struct pt_regs *regs, unsigned long address)
+{
+#ifdef CONFIG_X86_64
+	if ((regs->cs == __USER32_CS || (regs->cs & (1<<2))) &&
+	    (address >> 32))
+		return 1;
+#endif
+	return 0;
+}
+
 void do_invalid_op(struct pt_regs *, unsigned long);
 
 static int is_f00f_bug(struct pt_regs *regs, unsigned long address)
@@ -568,14 +584,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 		if (is_prefetch(regs, address, error_code))
 			return;
 
-		/* Work around K8 erratum #100 K8 in compat mode
-		   occasionally jumps to illegal addresses >4GB.  We
-		   catch this here in the page fault handler because
-		   these addresses are not reachable. Just detect this
-		   case and return.  Any code segment in LDT is
-		   compatibility mode. */
-		if ((regs->cs == __USER32_CS || (regs->cs & (1<<2))) &&
-		    (address >> 32))
+		if (is_errata100(regs, address))
 			return;
 
 		if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&