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objtool: Convert VALIDATE_UNRET_BEGIN to ANNOTATE

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Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20241128094311.358508242@infradead.org
This commit is contained in:
Peter Zijlstra 2024-11-28 10:38:56 +01:00
parent 317f2a6461
commit 18aa6118a1
4 changed files with 10 additions and 29 deletions
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9
include/linux/objtool.h
View File

@ -130,15 +130,12 @@
* NOTE: The macro must be used at the beginning of a global symbol, otherwise
* it will be ignored.
*/
.macro VALIDATE_UNRET_BEGIN
#if defined(CONFIG_NOINSTR_VALIDATION) && \
(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))
.Lhere_\@:
.pushsection .discard.validate_unret
.long .Lhere_\@ - .
.popsection
#define VALIDATE_UNRET_BEGIN ANNOTATE type=ANNOTYPE_UNRET_BEGIN
#else
#define VALIDATE_UNRET_BEGIN
#endif
.endm
.macro REACHABLE
.Lhere_\@:

1
include/linux/objtool_types.h
View File

@ -61,5 +61,6 @@ struct unwind_hint {
#define ANNOTYPE_RETPOLINE_SAFE 2
#define ANNOTYPE_INSTR_BEGIN 3
#define ANNOTYPE_INSTR_END 4
#define ANNOTYPE_UNRET_BEGIN 5
#endif /* _LINUX_OBJTOOL_TYPES_H */

1
tools/include/linux/objtool_types.h
View File

@ -61,5 +61,6 @@ struct unwind_hint {
#define ANNOTYPE_RETPOLINE_SAFE 2
#define ANNOTYPE_INSTR_BEGIN 3
#define ANNOTYPE_INSTR_END 4
#define ANNOTYPE_UNRET_BEGIN 5
#endif /* _LINUX_OBJTOOL_TYPES_H */

28
tools/objtool/check.c
View File

@ -2458,33 +2458,15 @@ static int __annotate_instr(int type, struct instruction *insn)
return 0;
}
static int read_validate_unret_hints(struct objtool_file *file)
static int __annotate_unret(int type, struct instruction *insn)
{
struct section *rsec;
struct instruction *insn;
struct reloc *reloc;
rsec = find_section_by_name(file->elf, ".rela.discard.validate_unret");
if (!rsec)
if (type != ANNOTYPE_UNRET_BEGIN)
return 0;
for_each_reloc(rsec, reloc) {
if (reloc->sym->type != STT_SECTION) {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.instr_end entry");
return -1;
}
insn->unret = 1;
}
insn->unret = 1;
return 0;
}
}
static int read_intra_function_calls(struct objtool_file *file)
{
@ -2705,7 +2687,7 @@ static int decode_sections(struct objtool_file *file)
if (ret)
return ret;
ret = read_validate_unret_hints(file);
ret = read_annotate(file, __annotate_unret);
if (ret)
return ret;