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authorJessica Yu <jeyu@kernel.org>2018-06-05 10:22:52 +0200
committerJessica Yu <jeyu@kernel.org>2018-06-18 10:04:03 +0200
commit9f2d1e68cf4d641def734adaccfc3823d3575e6c (patch)
tree8febb7c0433318d4fb69ccbf0f5147ca766028c5 /kernel/module.c
parentce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff)
downloadlinux-9f2d1e68cf4d641def734adaccfc3823d3575e6c.tar.bz2
module: exclude SHN_UNDEF symbols from kallsyms api
Livepatch modules are special in that we preserve their entire symbol tables in order to be able to apply relocations after module load. The unwanted side effect of this is that undefined (SHN_UNDEF) symbols of livepatch modules are accessible via the kallsyms api and this can confuse symbol resolution in livepatch (klp_find_object_symbol()) and cause subtle bugs in livepatch. Have the module kallsyms api skip over SHN_UNDEF symbols. These symbols are usually not available for normal modules anyway as we cut down their symbol tables to just the core (non-undefined) symbols, so this should really just affect livepatch modules. Note that this patch doesn't affect the display of undefined symbols in /proc/kallsyms. Reported-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Jessica Yu <jeyu@kernel.org>
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c
index f475f30eed8c..4a6b9c6d5f2c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4067,7 +4067,7 @@ static unsigned long mod_find_symname(struct module *mod, const char *name)
for (i = 0; i < kallsyms->num_symtab; i++)
if (strcmp(name, symname(kallsyms, i)) == 0 &&
- kallsyms->symtab[i].st_info != 'U')
+ kallsyms->symtab[i].st_shndx != SHN_UNDEF)
return kallsyms->symtab[i].st_value;
return 0;
}
@@ -4113,6 +4113,10 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
if (mod->state == MODULE_STATE_UNFORMED)
continue;
for (i = 0; i < kallsyms->num_symtab; i++) {
+
+ if (kallsyms->symtab[i].st_shndx == SHN_UNDEF)
+ continue;
+
ret = fn(data, symname(kallsyms, i),
mod, kallsyms->symtab[i].st_value);
if (ret != 0)