objtool: Do not validate IBT for .return_sites and .call_sites

The .return_sites and .call_sites sections reference text addresses,
but not with the intent to indirect branch to them, so they don't
need to be validated for IBT.

This is useful when running objtool on object files which already
have .return_sites or .call_sites sections, for example to re-run
objtool after it has reported an error or a warning.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://patch.msgid.link/20251121095340.464045-17-alexandre.chartre@oracle.com

Author: achartre

tools/objtool/check.c

@@ -4753,6 +4753,8 @@ static int validate_ibt(struct objtool_file *file)
 		    !strcmp(sec->name, ".llvm.call-graph-profile")	||
 		    !strcmp(sec->name, ".llvm_bb_addr_map")		||
 		    !strcmp(sec->name, "__tracepoints")			||
+		    !strcmp(sec->name, ".return_sites")			||
+		    !strcmp(sec->name, ".call_sites")			||
 		    !strcmp(sec->name, "__patchable_function_entries"))
 			continue;