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authorLinus Torvalds <torvalds@linux-foundation.org>2023-02-23 14:00:10 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2023-02-23 14:00:10 -0800
commit7dd86cf80127aeef8a447c81228a77f0f25cc211 (patch)
tree5edb72af92df06db74459a8e3da8b283d9dd757f /kernel
parentd8763154455e92a2ffed256e48fa46bb35ef3bdf (diff)
parent0c05e7bd2d017a3a9a0f4e9a19ad4acf1f616f12 (diff)
Merge tag 'livepatching-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
Pull livepatching updates from Petr Mladek: - Allow reloading a livepatched module by clearing livepatch-specific relocations in the livepatch module. Otherwise, the repeated load would fail on consistency checks. * tag 'livepatching-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: livepatch,x86: Clear relocation targets on a module removal x86/module: remove unused code in __apply_relocate_add
Diffstat (limited to 'kernel')
-rw-r--r--kernel/livepatch/core.c62
1 files changed, 49 insertions, 13 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index c973ed9e42f8..4bd2d5e10f20 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -260,6 +260,14 @@ static int klp_resolve_symbols(Elf_Shdr *sechdrs, const char *strtab,
return 0;
}
+void __weak clear_relocate_add(Elf_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+}
+
/*
* At a high-level, there are two types of klp relocation sections: those which
* reference symbols which live in vmlinux; and those which reference symbols
@@ -283,10 +291,10 @@ static int klp_resolve_symbols(Elf_Shdr *sechdrs, const char *strtab,
* the to-be-patched module to be loaded and patched sometime *after* the
* klp module is loaded.
*/
-int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
- const char *shstrtab, const char *strtab,
- unsigned int symndx, unsigned int secndx,
- const char *objname)
+static int klp_write_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
+ const char *shstrtab, const char *strtab,
+ unsigned int symndx, unsigned int secndx,
+ const char *objname, bool apply)
{
int cnt, ret;
char sec_objname[MODULE_NAME_LEN];
@@ -308,11 +316,26 @@ int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
if (strcmp(objname ? objname : "vmlinux", sec_objname))
return 0;
- ret = klp_resolve_symbols(sechdrs, strtab, symndx, sec, sec_objname);
- if (ret)
- return ret;
+ if (apply) {
+ ret = klp_resolve_symbols(sechdrs, strtab, symndx,
+ sec, sec_objname);
+ if (ret)
+ return ret;
+
+ return apply_relocate_add(sechdrs, strtab, symndx, secndx, pmod);
+ }
+
+ clear_relocate_add(sechdrs, strtab, symndx, secndx, pmod);
+ return 0;
+}
- return apply_relocate_add(sechdrs, strtab, symndx, secndx, pmod);
+int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs,
+ const char *shstrtab, const char *strtab,
+ unsigned int symndx, unsigned int secndx,
+ const char *objname)
+{
+ return klp_write_section_relocs(pmod, sechdrs, shstrtab, strtab, symndx,
+ secndx, objname, true);
}
/*
@@ -761,8 +784,9 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
func->old_sympos ? func->old_sympos : 1);
}
-static int klp_apply_object_relocs(struct klp_patch *patch,
- struct klp_object *obj)
+static int klp_write_object_relocs(struct klp_patch *patch,
+ struct klp_object *obj,
+ bool apply)
{
int i, ret;
struct klp_modinfo *info = patch->mod->klp_info;
@@ -773,10 +797,10 @@ static int klp_apply_object_relocs(struct klp_patch *patch,
if (!(sec->sh_flags & SHF_RELA_LIVEPATCH))
continue;
- ret = klp_apply_section_relocs(patch->mod, info->sechdrs,
+ ret = klp_write_section_relocs(patch->mod, info->sechdrs,
info->secstrings,
patch->mod->core_kallsyms.strtab,
- info->symndx, i, obj->name);
+ info->symndx, i, obj->name, apply);
if (ret)
return ret;
}
@@ -784,6 +808,18 @@ static int klp_apply_object_relocs(struct klp_patch *patch,
return 0;
}
+static int klp_apply_object_relocs(struct klp_patch *patch,
+ struct klp_object *obj)
+{
+ return klp_write_object_relocs(patch, obj, true);
+}
+
+static void klp_clear_object_relocs(struct klp_patch *patch,
+ struct klp_object *obj)
+{
+ klp_write_object_relocs(patch, obj, false);
+}
+
/* parts of the initialization that is done only when the object is loaded */
static int klp_init_object_loaded(struct klp_patch *patch,
struct klp_object *obj)
@@ -1171,7 +1207,7 @@ static void klp_cleanup_module_patches_limited(struct module *mod,
klp_unpatch_object(obj);
klp_post_unpatch_callback(obj);
-
+ klp_clear_object_relocs(patch, obj);
klp_free_object_loaded(obj);
break;
}