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authorPeter Zijlstra <peterz@infradead.org>2022-06-15 00:15:59 +0300
committerBorislav Petkov <bp@suse.de>2022-06-27 11:33:59 +0300
commit9bb2ec608a209018080ca262f771e6a9ff203b6f (patch)
treebe33da1675577b06894f7b15e7617cdd041afc49 /tools/objtool
parentbf5835bcdb9635c97f85120dba9bfa21e111130f (diff)
downloadlinux-9bb2ec608a209018080ca262f771e6a9ff203b6f.tar.xz
objtool: Update Retpoline validation
Update retpoline validation with the new CONFIG_RETPOLINE requirement of not having bare naked RET instructions. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'tools/objtool')
-rw-r--r--tools/objtool/check.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4252cd05dfc4..7dc378156a63 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2115,8 +2115,9 @@ static int read_retpoline_hints(struct objtool_file *file)
}
if (insn->type != INSN_JUMP_DYNAMIC &&
- insn->type != INSN_CALL_DYNAMIC) {
- WARN_FUNC("retpoline_safe hint not an indirect jump/call",
+ insn->type != INSN_CALL_DYNAMIC &&
+ insn->type != INSN_RETURN) {
+ WARN_FUNC("retpoline_safe hint not an indirect jump/call/ret",
insn->sec, insn->offset);
return -1;
}
@@ -3526,7 +3527,8 @@ static int validate_retpoline(struct objtool_file *file)
for_each_insn(file, insn) {
if (insn->type != INSN_JUMP_DYNAMIC &&
- insn->type != INSN_CALL_DYNAMIC)
+ insn->type != INSN_CALL_DYNAMIC &&
+ insn->type != INSN_RETURN)
continue;
if (insn->retpoline_safe)
@@ -3541,9 +3543,14 @@ static int validate_retpoline(struct objtool_file *file)
if (!strcmp(insn->sec->name, ".init.text") && !opts.module)
continue;
- WARN_FUNC("indirect %s found in RETPOLINE build",
- insn->sec, insn->offset,
- insn->type == INSN_JUMP_DYNAMIC ? "jump" : "call");
+ if (insn->type == INSN_RETURN) {
+ WARN_FUNC("'naked' return found in RETPOLINE build",
+ insn->sec, insn->offset);
+ } else {
+ WARN_FUNC("indirect %s found in RETPOLINE build",
+ insn->sec, insn->offset,
+ insn->type == INSN_JUMP_DYNAMIC ? "jump" : "call");
+ }
warnings++;
}