Patch "objtool: Fix another switch table detection issue" has been added to the 4.15-stable tree

Patch "objtool: Fix another switch table detection issue" has been added to the 4.15-stable tree

[gregkh]

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

    objtool: Fix another switch table detection issue

to the 4.15-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:
     objtool-fix-another-switch-table-detection-issue.patch
and it can be found in the queue-4.15 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 1402fd8ed7e5bda1b3e7613b70780b0db392d1e6 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Wed, 28 Feb 2018 07:19:21 -0600
Subject: objtool: Fix another switch table detection issue

From: Josh Poimboeuf <jpoimboe@redhat.com>

commit 1402fd8ed7e5bda1b3e7613b70780b0db392d1e6 upstream.

Continue the switch table detection whack-a-mole.  Add a check to
distinguish KASAN data reads from switch data reads.  The switch jump
tables in .rodata have relocations associated with them.

This fixes the following warning:

  crypto/asymmetric_keys/x509_cert_parser.o: warning: objtool: x509_note_pkey_algo()+0xa4: sibling call from callable instruction with modified stack frame

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/d7c8853022ad47d158cb81e953a40469fc08a95e.1519784382.git.jpoimboe@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/objtool/check.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -924,7 +924,11 @@ static struct rela *find_switch_table(st
 		if (find_symbol_containing(file->rodata, text_rela->addend))
 			continue;
 
-		return find_rela_by_dest(file->rodata, text_rela->addend);
+		rodata_rela = find_rela_by_dest(file->rodata, text_rela->addend);
+		if (!rodata_rela)
+			continue;
+
+		return rodata_rela;
 	}
 
 	return NULL;


Patches currently in stable-queue which might be from jpoimboe@redhat.com are

queue-4.15/x86-kprobes-fix-kernel-crash-when-probing-.entry_trampoline-code.patch
queue-4.15/objtool-fix-32-bit-build.patch
queue-4.15/x86-boot-objtool-annotate-indirect-jump-in-secondary_startup_64.patch
queue-4.15/objtool-add-module-specific-retpoline-rules.patch
queue-4.15/x86-ldt-avoid-warning-in-32-bit-builds-with-older-gcc.patch
queue-4.15/x86-entry-reduce-the-code-footprint-of-the-idtentry-macro.patch
queue-4.15/objtool-retpolines-integrate-objtool-with-retpoline-support-more-closely.patch
queue-4.15/nospec-include-asm-barrier.h-dependency.patch
queue-4.15/x86-mm-remove-stale-comment-about-kmemcheck.patch
queue-4.15/objtool-add-retpoline-validation.patch
queue-4.15/x86-mm-sme-objtool-annotate-indirect-call-in-sme_encrypt_execute.patch
queue-4.15/x86-asm-improve-how-gen_-_suffixed_rmwcc-specify-clobbers.patch
queue-4.15/x86-64-realmode-add-instruction-suffix.patch
queue-4.15/objtool-fix-another-switch-table-detection-issue.patch
queue-4.15/x86-speculation-objtool-annotate-indirect-calls-jumps-for-objtool.patch
queue-4.15/x86-paravirt-objtool-annotate-indirect-calls.patch
queue-4.15/objtool-use-existing-global-variables-for-options.patch
queue-4.15/x86-entry-64-use-xorl-for-faster-register-clearing.patch
queue-4.15/nospec-kill-array_index_nospec_mask_check.patch
queue-4.15/x86-io-apic-avoid-warning-in-32-bit-builds.patch