Patch "extable: Consolidate *kernel_text_address() functions" has been added to the 4.13-stable tree

Patch "extable: Consolidate *kernel_text_address() functions" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    extable: Consolidate *kernel_text_address() functions

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     extable-consolidate-kernel_text_address-functions.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9aadde91b3c035413c806619beb3e3ef6e697953 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Date: Fri, 22 Sep 2017 17:22:19 -0400
Subject: extable: Consolidate *kernel_text_address() functions

From: Steven Rostedt (VMware) <rostedt@goodmis.org>

commit 9aadde91b3c035413c806619beb3e3ef6e697953 upstream.

The functionality between kernel_text_address() and _kernel_text_address()
is the same except that _kernel_text_address() does a little more (that
function needs a rename, but that can be done another time). Instead of
having duplicate code in both, simply have _kernel_text_address() calls
kernel_text_address() instead.

This is marked for stable because there's an RCU bug that can happen if
one of these functions gets called while RCU is not watching. That fix
depends on this fix to keep from having to write the fix twice.

Fixes: 0be964be0 ("module: Sanitize RCU usage and locking")
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/extable.c |   10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -102,15 +102,7 @@ int core_kernel_data(unsigned long addr)
 
 int __kernel_text_address(unsigned long addr)
 {
-	if (core_kernel_text(addr))
-		return 1;
-	if (is_module_text_address(addr))
-		return 1;
-	if (is_ftrace_trampoline(addr))
-		return 1;
-	if (is_kprobe_optinsn_slot(addr) || is_kprobe_insn_slot(addr))
-		return 1;
-	if (is_bpf_text_address(addr))
+	if (kernel_text_address(addr))
 		return 1;
 	/*
 	 * There might be init symbols in saved stacktraces.


Patches currently in stable-queue which might be from rostedt@goodmis.org are

queue-4.13/extable-enable-rcu-if-it-is-not-watching-in-kernel_text_address.patch
queue-4.13/tracing-erase-irqsoff-trace-with-empty-write.patch
queue-4.13/tracing-fix-trace_pipe-behavior-for-instance-traces.patch
queue-4.13/rcu-allow-for-page-faults-in-nmi-handlers.patch
queue-4.13/genirq-fix-cpumask-check-in-__irq_startup_managed.patch
queue-4.13/tracing-remove-rcu-work-arounds-from-stack-tracer.patch
queue-4.13/extable-consolidate-kernel_text_address-functions.patch