diff options
Diffstat (limited to 'kernel/livepatch')
| -rw-r--r-- | kernel/livepatch/Kconfig | 12 | ||||
| -rw-r--r-- | kernel/livepatch/core.c | 16 |
2 files changed, 23 insertions, 5 deletions
diff --git a/kernel/livepatch/Kconfig b/kernel/livepatch/Kconfig index 53d51ed619a3..4c0a9c18d0b2 100644 --- a/kernel/livepatch/Kconfig +++ b/kernel/livepatch/Kconfig @@ -18,3 +18,15 @@ config LIVEPATCH module uses the interface provided by this option to register a patch, causing calls to patched functions to be redirected to new function code contained in the patch module. + +config HAVE_KLP_BUILD + bool + help + Arch supports klp-build + +config KLP_BUILD + def_bool y + depends on LIVEPATCH && HAVE_KLP_BUILD + select OBJTOOL + help + Enable klp-build support diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index 0e73fac55f8e..9917756dae46 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -88,8 +88,14 @@ static struct klp_func *klp_find_func(struct klp_object *obj, struct klp_func *func; klp_for_each_func(obj, func) { + /* + * Besides identical old_sympos, also consider old_sympos + * of 0 and 1 are identical. + */ if ((strcmp(old_func->old_name, func->old_name) == 0) && - (old_func->old_sympos == func->old_sympos)) { + ((old_func->old_sympos == func->old_sympos) || + (old_func->old_sympos == 0 && func->old_sympos == 1) || + (old_func->old_sympos == 1 && func->old_sympos == 0))) { return func; } } @@ -217,14 +223,14 @@ static int klp_resolve_symbols(Elf_Shdr *sechdrs, const char *strtab, for (i = 0; i < relasec->sh_size / sizeof(Elf_Rela); i++) { sym = (Elf_Sym *)sechdrs[symndx].sh_addr + ELF_R_SYM(relas[i].r_info); if (sym->st_shndx != SHN_LIVEPATCH) { - pr_err("symbol %s is not marked as a livepatch symbol\n", - strtab + sym->st_name); + pr_err("symbol %s at rela sec %u idx %d is not marked as a livepatch symbol\n", + strtab + sym->st_name, symndx, i); return -EINVAL; } /* Format: .klp.sym.sym_objname.sym_name,sympos */ cnt = sscanf(strtab + sym->st_name, - ".klp.sym.%55[^.].%511[^,],%lu", + KLP_SYM_PREFIX "%55[^.].%511[^,],%lu", sym_objname, sym_name, &sympos); if (cnt != 3) { pr_err("symbol %s has an incorrectly formatted name\n", @@ -303,7 +309,7 @@ static int klp_write_section_relocs(struct module *pmod, Elf_Shdr *sechdrs, * See comment in klp_resolve_symbols() for an explanation * of the selected field width value. */ - cnt = sscanf(shstrtab + sec->sh_name, ".klp.rela.%55[^.]", + cnt = sscanf(shstrtab + sec->sh_name, KLP_RELOC_SEC_PREFIX "%55[^.]", sec_objname); if (cnt != 1) { pr_err("section %s has an incorrectly formatted name\n", |