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objtool: Track init section

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For future usage of .init.text exclusion track the init section in the
instruction decoder and use the result in retpoline validation.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111145.910334431@infradead.org
This commit is contained in:
Peter Zijlstra 2022-09-15 13:11:08 +02:00
parent 61c6065ef7
commit 6644ee846c
2 changed files with 11 additions and 8 deletions
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17
tools/objtool/check.c
View file

@ -382,6 +382,15 @@ static int decode_instructions(struct objtool_file *file)
!strncmp(sec->name, ".text.__x86.", 12))
sec->noinstr = true;
/*
* .init.text code is ran before userspace and thus doesn't
* strictly need retpolines, except for modules which are
* loaded late, they very much do need retpoline in their
* .init.text
*/
if (!strcmp(sec->name, ".init.text") && !opts.module)
sec->init = true;
for (offset = 0; offset < sec->sh.sh_size; offset += insn->len) {
insn = malloc(sizeof(*insn));
if (!insn) {
@ -3748,13 +3757,7 @@ static int validate_retpoline(struct objtool_file *file)
if (insn->retpoline_safe)
continue;
/*
* .init.text code is ran before userspace and thus doesn't
* strictly need retpolines, except for modules which are
* loaded late, they very much do need retpoline in their
* .init.text
*/
if (!strcmp(insn->sec->name, ".init.text") && !opts.module)
if (insn->sec->init)
continue;
if (insn->type == INSN_RETURN) {

2
tools/objtool/include/objtool/elf.h
View file

@ -38,7 +38,7 @@ struct section {
Elf_Data *data;
char *name;
int idx;
bool changed, text, rodata, noinstr;
bool changed, text, rodata, noinstr, init;
};
struct symbol {