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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull objtool fix from Thomas Gleixner:
 "A fix to the objtool sibling call detection logic to distinguish
  normal jumps inside a function from a real sibling call"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Fix sibling call detection logic
This commit is contained in:
Linus Torvalds 2017-07-09 09:58:44 -07:00
parent bc2c6421cb 4855022a52
commit 19bf2e0ef1
1 changed files with 11 additions and 2 deletions
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13
tools/objtool/check.c
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@ -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;