linux-kernel - [GIT pull] core updates for 4.13

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Date:   Sun, 9 Jul 2017 10:44:16 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [GIT pull] core updates for 4.13

Linus,

please pull the latest core-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-for-linus

A fix to the objtool sibling call detection logic to distinguish normal
jumps inside a function from a real sibling call.

Thanks,

	tglx

------------------>
Josh Poimboeuf (1):
      objtool: Fix sibling call detection logic


 tools/objtool/check.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index fea222192c57..2c6d74880403 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1371,6 +1371,12 @@ static int validate_branch(struct objtool_file *file, struct instruction *first,
 
 		func = insn->func;
 
+		if (func && insn->ignore) {
+			WARN_FUNC("BUG: why am I validating an ignored function?",
+				  sec, insn->offset);
+			return -1;
+		}
+
 		if (insn->visited) {
 			if (!!insn_state_match(insn, &state))
 				return 1;
@@ -1426,16 +1432,19 @@ static int validate_branch(struct objtool_file *file, struct instruction *first,
 
 		case INSN_JUMP_CONDITIONAL:
 		case INSN_JUMP_UNCONDITIONAL:
-			if (insn->jump_dest) {
+			if (insn->jump_dest &&
+			    (!func || !insn->jump_dest->func ||
+			     func == insn->jump_dest->func)) {
 				ret = validate_branch(file, insn->jump_dest,
 						      state);
 				if (ret)
 					return 1;
+
 			} else if (func && has_modified_stack_frame(&state)) {
 				WARN_FUNC("sibling call from callable instruction with modified stack frame",
 					  sec, insn->offset);
 				return 1;
-			} /* else it's a sibling call */
+			}
 
 			if (insn->type == INSN_JUMP_UNCONDITIONAL)
 				return 0;