diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-09 09:58:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-09 09:58:44 -0700 |
| commit | 19bf2e0ef18ec8a7284ecc83459a2664cb885cd5 (patch) | |
| tree | cc3e190be6bc774f0640982e3a051551b35b7c8c | |
| parent | bc2c6421cbb420677c4bb56adaf434414770ce8a (diff) | |
| parent | 4855022a52262411ce38c93dec4cb1470705c0a0 (diff) | |
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
| -rw-r--r-- | tools/objtool/check.c | 13 |
1 files 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; |