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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Browse Source 
Pull mudule updates from Rusty Russell:
 "We get rid of the general module prefix confusion with a binary config
  option, fix a remove/insert race which Never Happens, and (my
  favorite) handle the case when we have too many modules for a single
  commandline.  Seriously, the kernel is full, please go away!"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  modpost: fix unwanted VMLINUX_SYMBOL_STR expansion
  X.509: Support parse long form of length octets in Authority Key Identifier
  module: don't unlink the module until we've removed all exposure.
  kernel: kallsyms: memory override issue, need check destination buffer length
  MODSIGN: do not send garbage to stderr when enabling modules signature
  modpost: handle huge numbers of modules.
  modpost: add -T option to read module names from file/stdin.
  modpost: minor cleanup.
  genksyms: pass symbol-prefix instead of arch
  module: fix symbol versioning with symbol prefixes
  CONFIG_SYMBOL_PREFIX: cleanup.
This commit is contained in:
Linus Torvalds
2013-05-05 10:58:06 -07:00
parent 24d0c2542b a53a11f357
commit f8ce1faf55
23 changed files with 202 additions and 140 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
scripts/Makefile.build
View File

@ -211,7 +211,8 @@ $(obj)/%.i: $(src)/%.c FORCE
cmd_gensymtypes = \
$(CPP) -D__GENKSYMS__ $(c_flags) $< | \
$(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH) \
$(GENKSYMS) $(if $(1), -T $(2)) \
$(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
$(if $(KBUILD_PRESERVE),-p) \
-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))

7
scripts/Makefile.lib
View File

@ -119,13 +119,6 @@ _c_flags += $(if $(patsubst n%,, \
$(CFLAGS_GCOV))
endif
ifdef CONFIG_SYMBOL_PREFIX
_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
_cpp_flags += $(_sym_flags)
_a_flags += $(_sym_flags)
endif
# If building the kernel in a separate objtree expand all occurrences
# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').

8
scripts/Makefile.modpost
View File

@ -60,7 +60,8 @@ kernelsymfile := $(objtree)/Module.symvers
modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
# Step 1), find all modules listed in $(MODVERDIR)/
__modules := $(sort $(shell grep -h '\.ko$$' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
__modules := $(shell $(MODLISTCMD))
modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
@ -78,12 +79,13 @@ modpost = scripts/mod/modpost \
$(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
$(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
# We can go over command line length here, so be careful.
quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
cmd_modpost = $(modpost) -s
cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) -s -T -
PHONY += __modpost
__modpost: $(modules:.ko=.o) FORCE
$(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^)
$(call cmd,modpost) $(wildcard vmlinux)
quiet_cmd_kernel-mod = MODPOST $@
cmd_kernel-mod = $(modpost) $@

18
scripts/genksyms/genksyms.c
View File

@ -45,7 +45,6 @@ int in_source_file;
static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
flag_preserve, flag_warnings;
static const char *arch = "";
static const char *mod_prefix = "";
static int errors;
@ -731,7 +730,7 @@ static void genksyms_usage(void)
{
fputs("Usage:\n" "genksyms [-adDTwqhV] > /path/to/.tmp_obj.ver\n" "\n"
#ifdef __GNU_LIBRARY__
" -a, --arch Select architecture\n"
" -s, --symbol-prefix Select symbol prefix\n"
" -d, --debug Increment the debug level (repeatable)\n"
" -D, --dump Dump expanded symbol defs (for debugging only)\n"
" -r, --reference file Read reference symbols from a file\n"
@ -742,7 +741,7 @@ static void genksyms_usage(void)
" -h, --help Print this message\n"
" -V, --version Print the release version\n"
#else /* __GNU_LIBRARY__ */
" -a Select architecture\n"
" -s Select symbol prefix\n"
" -d Increment the debug level (repeatable)\n"
" -D Dump expanded symbol defs (for debugging only)\n"
" -r file Read reference symbols from a file\n"
@ -763,7 +762,7 @@ int main(int argc, char **argv)
#ifdef __GNU_LIBRARY__
struct option long_opts[] = {
{"arch", 1, 0, 'a'},
{"symbol-prefix", 1, 0, 's'},
{"debug", 0, 0, 'd'},
{"warnings", 0, 0, 'w'},
{"quiet", 0, 0, 'q'},
@ -776,14 +775,14 @@ int main(int argc, char **argv)
{0, 0, 0, 0}
};
while ((o = getopt_long(argc, argv, "a:dwqVDr:T:ph",
while ((o = getopt_long(argc, argv, "s:dwqVDr:T:ph",
&long_opts[0], NULL)) != EOF)
#else /* __GNU_LIBRARY__ */
while ((o = getopt(argc, argv, "a:dwqVDr:T:ph")) != EOF)
while ((o = getopt(argc, argv, "s:dwqVDr:T:ph")) != EOF)
#endif /* __GNU_LIBRARY__ */
switch (o) {
case 'a':
arch = optarg;
case 's':
mod_prefix = optarg;
break;
case 'd':
flag_debug++;
@ -826,9 +825,6 @@ int main(int argc, char **argv)
genksyms_usage();
return 1;
}
if ((strcmp(arch, "h8300") == 0) || (strcmp(arch, "blackfin") == 0) ||
(strcmp(arch, "metag") == 0))
mod_prefix = "_";
{
extern int yydebug;
extern int yy_flex_debug;

5
scripts/link-vmlinux.sh
View File

@ -74,9 +74,8 @@ kallsyms()
info KSYM ${2}
local kallsymopt;
if [ -n "${CONFIG_SYMBOL_PREFIX}" ]; then
kallsymopt="${kallsymopt} \
--symbol-prefix=${CONFIG_SYMBOL_PREFIX}"
if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
kallsymopt="${kallsymopt} --symbol-prefix=_"
fi
if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then

94
scripts/mod/modpost.c
View File

@ -15,17 +15,12 @@
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include <stdbool.h>
#include "modpost.h"
#include "../../include/generated/autoconf.h"
#include "../../include/linux/license.h"
/* Some toolchains use a `_' prefix for all user symbols. */
#ifdef CONFIG_SYMBOL_PREFIX
#define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
#else
#define MODULE_SYMBOL_PREFIX ""
#endif
#include "../../include/linux/export.h"
/* Are we using CONFIG_MODVERSIONS? */
int modversions = 0;
@ -85,6 +80,14 @@ PRINTF void merror(const char *fmt, ...)
va_end(arglist);
}
static inline bool strends(const char *str, const char *postfix)
{
if (strlen(str) < strlen(postfix))
return false;
return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
}
static int is_vmlinux(const char *modname)
{
const char *myname;
@ -120,22 +123,20 @@ static struct module *find_module(char *modname)
return mod;
}
static struct module *new_module(char *modname)
static struct module *new_module(const char *modname)
{
struct module *mod;
char *p, *s;
char *p;
mod = NOFAIL(malloc(sizeof(*mod)));
memset(mod, 0, sizeof(*mod));
p = NOFAIL(strdup(modname));
/* strip trailing .o */
s = strrchr(p, '.');
if (s != NULL)
if (strcmp(s, ".o") == 0) {
*s = '\0';
mod->is_dot_o = 1;
}
if (strends(p, ".o")) {
p[strlen(p) - 2] = '\0';
mod->is_dot_o = 1;
}
/* add to list */
mod->name = p;
@ -562,7 +563,7 @@ static void parse_elf_finish(struct elf_info *info)
static int ignore_undef_symbol(struct elf_info *info, const char *symname)
{
/* ignore __this_module, it will be resolved shortly */
if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
return 1;
/* ignore global offset table */
if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
@ -583,8 +584,8 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
return 0;
}
#define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
#define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
#define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
#define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
static void handle_modversions(struct module *mod, struct elf_info *info,
Elf_Sym *sym, const char *symname)
@ -637,14 +638,15 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
}
#endif
if (memcmp(symname, MODULE_SYMBOL_PREFIX,
strlen(MODULE_SYMBOL_PREFIX)) == 0) {
mod->unres =
alloc_symbol(symname +
strlen(MODULE_SYMBOL_PREFIX),
ELF_ST_BIND(sym->st_info) == STB_WEAK,
mod->unres);
}
#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
if (symname[0] != '_')
break;
else
symname++;
#endif
mod->unres = alloc_symbol(symname,
ELF_ST_BIND(sym->st_info) == STB_WEAK,
mod->unres);
break;
default:
/* All exported symbols */
@ -652,9 +654,9 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
export);
}
if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
mod->has_init = 1;
if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
mod->has_cleanup = 1;
break;
}
@ -1762,6 +1764,27 @@ static void read_symbols(char *modname)
mod->unres = alloc_symbol("module_layout", 0, mod->unres);
}
static void read_symbols_from_files(const char *filename)
{
FILE *in = stdin;
char fname[PATH_MAX];
if (strcmp(filename, "-") != 0) {
in = fopen(filename, "r");
if (!in)
fatal("Can't open filenames file %s: %m", filename);
}
while (fgets(fname, PATH_MAX, in) != NULL) {
if (strends(fname, "\n"))
fname[strlen(fname)-1] = '\0';
read_symbols(fname);
}
if (in != stdin)
fclose(in);
}
#define SZ 500
/* We first write the generated file into memory using the
@ -1934,7 +1957,8 @@ static int add_versions(struct buffer *b, struct module *mod)
s->name, mod->name);
continue;
}
buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
s->crc, s->name);
}
buf_printf(b, "};\n");
@ -2122,13 +2146,13 @@ int main(int argc, char **argv)
struct module *mod;
struct buffer buf = { };
char *kernel_read = NULL, *module_read = NULL;
char *dump_write = NULL;
char *dump_write = NULL, *files_source = NULL;
int opt;
int err;
struct ext_sym_list *extsym_iter;
struct ext_sym_list *extsym_start = NULL;
while ((opt = getopt(argc, argv, "i:I:e:msSo:awM:K:")) != -1) {
while ((opt = getopt(argc, argv, "i:I:e:msST:o:awM:K:")) != -1) {
switch (opt) {
case 'i':
kernel_read = optarg;
@ -2160,6 +2184,9 @@ int main(int argc, char **argv)
case 'S':
sec_mismatch_verbose = 0;
break;
case 'T':
files_source = optarg;
break;
case 'w':
warn_unresolved = 1;
break;
@ -2182,6 +2209,9 @@ int main(int argc, char **argv)
while (optind < argc)
read_symbols(argv[optind++]);
if (files_source)
read_symbols_from_files(files_source);
for (mod = modules; mod; mod = mod->next) {
if (mod->skip)
continue;