Re: [PATCH v4 15/22] objtool: Prevent kCFI hashes from being decoded as instructions
From: Song Liu <song@kernel.org>
Date: 2026-08-11 23:58:31
Also in:
linux-arm-kernel, lkml
On Sat, Aug 8, 2026 at 4:18 PM Josh Poimboeuf [off-list ref] wrote: [...]
+/*
+ * ARM64 mapping symbols ($d, $x, $a, __pi_$d, etc) which mark transitions
+ * between code and data.
+ */
+static inline bool is_mapping_sym(struct symbol *sym)
+{
+ return is_notype_sym(sym) && strchr(sym->name, '$');
+}
+
+static inline bool is_data_mapping_sym(struct symbol *sym)
+{
+ const char *dollar;
+
+ if (!is_mapping_sym(sym))
+ return false;
+
+ dollar = strchr(sym->name, '$');
+ return dollar && dollar[1] == 'd';nit: is_data_mapping_sym() calls strchr() twice. Maybe we can optimize it by eliminating a strchr()? Thanks, Song
quoted hunk ↗ jump to hunk
+} + static inline bool is_global_sym(struct symbol *sym) { return sym->bind == STB_GLOBAL;@@ -508,6 +528,9 @@ static inline void set_sym_next_reloc(struct reloc *reloc, struct reloc *next) #define sec_for_each_sym(sec, sym) \ list_for_each_entry(sym, &sec->symbol_list, list) +#define sec_for_each_sym_from(sec, sym) \ + list_for_each_entry_from(sym, &sec->symbol_list, list) + #define sec_prev_sym(sym) \ sym->sec && sym->list.prev != &sym->sec->symbol_list ? \ list_prev_entry(sym, list) : NULL --2.54.0