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Modules fixes for v5.4-rc5

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- Revert __ksymtab_$namespace.$symbol naming scheme back to
   __ksymtab_$symbol, as it was causing issues with depmod. Instead,
   have modpost extract a symbol's namespace from __kstrtabns and
   __ksymtab_strings.
 
 - Fix `make nsdeps` for out of tree kernel builds (make O=...) caused by
   unescaped '/'. Use a different sed delimiter to avoid this problem.
 
 Signed-off-by: Jessica Yu <jeyu@kernel.org>
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Merge tag 'modules-for-v5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux

Pull modules fixes from Jessica Yu:

 - Revert __ksymtab_$namespace.$symbol naming scheme back to
   __ksymtab_$symbol, as it was causing issues with depmod.

   Instead, have modpost extract a symbol's namespace from __kstrtabns
   and __ksymtab_strings.

 - Fix `make nsdeps` for out of tree kernel builds (make O=...) caused
   by unescaped '/'.

   Use a different sed delimiter to avoid this problem.

* tag 'modules-for-v5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
  scripts/nsdeps: use alternative sed delimiter
  symbol namespaces: revert to previous __ksymtab name scheme
  modpost: make updating the symbol namespace explicit
  modpost: delegate updating namespaces to separate function
This commit is contained in:
Linus Torvalds 2019-10-25 16:11:55 -04:00
commit 9e2dd2ca85
4 changed files with 47 additions and 29 deletions
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14
include/linux/export.h
View File

@ -18,8 +18,6 @@ extern struct module __this_module;
#define THIS_MODULE ((struct module *)0)
#endif
#define NS_SEPARATOR "."
#ifdef CONFIG_MODVERSIONS
/* Mark the CRC weak since genksyms apparently decides not to
* generate a checksums for some symbols */
@ -48,11 +46,11 @@ extern struct module __this_module;
* absolute relocations that require runtime processing on relocatable
* kernels.
*/
#define __KSYMTAB_ENTRY_NS(sym, sec, ns) \
#define __KSYMTAB_ENTRY_NS(sym, sec) \
__ADDRESSABLE(sym) \
asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
" .balign 4 \n" \
"__ksymtab_" #ns NS_SEPARATOR #sym ": \n" \
"__ksymtab_" #sym ": \n" \
" .long " #sym "- . \n" \
" .long __kstrtab_" #sym "- . \n" \
" .long __kstrtabns_" #sym "- . \n" \
@ -74,16 +72,14 @@ struct kernel_symbol {
int namespace_offset;
};
#else
#define __KSYMTAB_ENTRY_NS(sym, sec, ns) \
static const struct kernel_symbol __ksymtab_##sym##__##ns \
asm("__ksymtab_" #ns NS_SEPARATOR #sym) \
#define __KSYMTAB_ENTRY_NS(sym, sec) \
static const struct kernel_symbol __ksymtab_##sym \
__attribute__((section("___ksymtab" sec "+" #sym), used)) \
__aligned(sizeof(void *)) \
= { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym }
#define __KSYMTAB_ENTRY(sym, sec) \
static const struct kernel_symbol __ksymtab_##sym \
asm("__ksymtab_" #sym) \
__attribute__((section("___ksymtab" sec "+" #sym), used)) \
__aligned(sizeof(void *)) \
= { (unsigned long)&sym, __kstrtab_##sym, NULL }
@ -115,7 +111,7 @@ struct kernel_symbol {
static const char __kstrtabns_##sym[] \
__attribute__((section("__ksymtab_strings"), used, aligned(1))) \
= #ns; \
__KSYMTAB_ENTRY_NS(sym, sec, ns)
__KSYMTAB_ENTRY_NS(sym, sec)
#define ___EXPORT_SYMBOL(sym, sec) \
___export_symbol_common(sym, sec); \

59
scripts/mod/modpost.c
View File

@ -348,26 +348,38 @@ static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
return export_unknown;
}
static char *sym_extract_namespace(const char **symname)
static const char *namespace_from_kstrtabns(struct elf_info *info,
Elf_Sym *kstrtabns)
{
char *namespace = NULL;
char *ns_separator;
char *value = info->ksymtab_strings + kstrtabns->st_value;
return value[0] ? value : NULL;
}
ns_separator = strchr(*symname, '.');
if (ns_separator) {
namespace = NOFAIL(strndup(*symname, ns_separator - *symname));
*symname = ns_separator + 1;
static void sym_update_namespace(const char *symname, const char *namespace)
{
struct symbol *s = find_symbol(symname);
/*
* That symbol should have been created earlier and thus this is
* actually an assertion.
*/
if (!s) {
merror("Could not update namespace(%s) for symbol %s\n",
namespace, symname);
return;
}
return namespace;
free(s->namespace);
s->namespace =
namespace && namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
}
/**
* Add an exported symbol - it may have already been added without a
* CRC, in this case just update the CRC
**/
static struct symbol *sym_add_exported(const char *name, const char *namespace,
struct module *mod, enum export export)
static struct symbol *sym_add_exported(const char *name, struct module *mod,
enum export export)
{
struct symbol *s = find_symbol(name);
@ -383,8 +395,6 @@ static struct symbol *sym_add_exported(const char *name, const char *namespace,
s->module = mod;
}
}
free(s->namespace);
s->namespace = namespace ? strdup(namespace) : NULL;
s->preloaded = 0;
s->vmlinux = is_vmlinux(mod->name);
s->kernel = 0;
@ -583,6 +593,10 @@ static int parse_elf(struct elf_info *info, const char *filename)
info->export_unused_gpl_sec = i;
else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
info->export_gpl_future_sec = i;
else if (strcmp(secname, "__ksymtab_strings") == 0)
info->ksymtab_strings = (void *)hdr +
sechdrs[i].sh_offset -
sechdrs[i].sh_addr;
if (sechdrs[i].sh_type == SHT_SYMTAB) {
unsigned int sh_link_idx;
@ -672,7 +686,6 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
enum export export;
bool is_crc = false;
const char *name;
char *namespace;
if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
strstarts(symname, "__ksymtab"))
@ -745,9 +758,7 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
/* All exported symbols */
if (strstarts(symname, "__ksymtab_")) {
name = symname + strlen("__ksymtab_");
namespace = sym_extract_namespace(&name);
sym_add_exported(name, namespace, mod, export);
free(namespace);
sym_add_exported(name, mod, export);
}
if (strcmp(symname, "init_module") == 0)
mod->has_init = 1;
@ -2043,6 +2054,16 @@ static void read_symbols(const char *modname)
handle_moddevtable(mod, &info, sym, symname);
}
/* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
symname = remove_dot(info.strtab + sym->st_name);
if (strstarts(symname, "__kstrtabns_"))
sym_update_namespace(symname + strlen("__kstrtabns_"),
namespace_from_kstrtabns(&info,
sym));
}
// check for static EXPORT_SYMBOL_* functions && global vars
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
unsigned char bind = ELF_ST_BIND(sym->st_info);
@ -2196,7 +2217,7 @@ static int check_exports(struct module *mod)
else
basename = mod->name;
if (exp->namespace && exp->namespace[0]) {
if (exp->namespace) {
add_namespace(&mod->required_namespaces,
exp->namespace);
@ -2454,12 +2475,12 @@ static void read_dump(const char *fname, unsigned int kernel)
mod = new_module(modname);
mod->skip = 1;
}
s = sym_add_exported(symname, namespace, mod,
export_no(export));
s = sym_add_exported(symname, mod, export_no(export));
s->kernel = kernel;
s->preloaded = 1;
s->is_static = 0;
sym_update_crc(symname, mod, crc, export_no(export));
sym_update_namespace(symname, namespace);
}
release_file(file, size);
return;

1
scripts/mod/modpost.h
View File

@ -143,6 +143,7 @@ struct elf_info {
Elf_Section export_gpl_sec;
Elf_Section export_unused_gpl_sec;
Elf_Section export_gpl_future_sec;
char *ksymtab_strings;
char *strtab;
char *modinfo;
unsigned int modinfo_len;

2
scripts/nsdeps
View File

@ -33,7 +33,7 @@ generate_deps() {
if [ ! -f "$ns_deps_file" ]; then return; fi
local mod_source_files=`cat $mod_file | sed -n 1p \
| sed -e 's/\.o/\.c/g' \
| sed "s/[^ ]* */${srctree}\/&/g"`
| sed "s|[^ ]* *|${srctree}/&|g"`
for ns in `cat $ns_deps_file`; do
echo "Adding namespace $ns to module $mod_name (if needed)."
generate_deps_for_ns $ns $mod_source_files