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modprobe: add --show-exports

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modprobe has --show-modversions switch, which dumps symbols with
their modversion crcs from the __versions sections.

At the moment the section contains information for the dependency
symbols only, while exported symbols add to symtab entries with
__crc_ prefix (the format may differ, see 1e48901166 libkmod-elf:
resolve CRC if module is built with MODULE_REL_CRCS).

The patch makes it to show exported symbols as well.

The function is basically cut'n'paste of show_modversions(),
but 'version' family replaced with 'symbol' one.

Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
This commit is contained in:
Yauheni Kaliuta 2018-11-13 11:00:29 +02:00 committed by Lucas De Marchi
parent 8353284d83
commit 3ada8df85c
1 changed files with 36 additions and 0 deletions
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36
tools/modprobe.c
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@ -76,6 +76,7 @@ static const struct option cmdopts[] = {
{"show-config", no_argument, 0, 'c'},
{"show-modversions", no_argument, 0, 4},
{"dump-modversions", no_argument, 0, 4},
{"show-exports", no_argument, 0, 6},
{"dry-run", no_argument, 0, 'n'},
{"show", no_argument, 0, 'n'},
@ -124,6 +125,7 @@ static void help(void)
"\t-c, --show-config Same as --showconfig\n"
"\t --show-modversions Dump module symbol version and exit\n"
"\t --dump-modversions Same as --show-modversions\n"
"\t --show-exports Only print module exported symbol versions and exit\n"
"\n"
"General Options:\n"
"\t-n, --dry-run Do not execute operations, just print out\n"
@ -232,6 +234,34 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
return 0;
}
static int show_exports(struct kmod_ctx *ctx, const char *filename)
{
struct kmod_list *l, *list = NULL;
struct kmod_module *mod;
int err = kmod_module_new_from_path(ctx, filename, &mod);
if (err < 0) {
LOG("Module %s not found.\n", filename);
return err;
}
err = kmod_module_get_symbols(mod, &list);
if (err < 0) {
LOG("could not get symbols of %s: %s\n",
filename, strerror(-err));
kmod_module_unref(mod);
return err;
}
kmod_list_foreach(l, list) {
const char *symbol = kmod_module_symbol_get_symbol(l);
uint64_t crc = kmod_module_symbol_get_crc(l);
printf("0x%08"PRIx64"\t%s\n", crc, symbol);
}
kmod_module_symbols_free_list(list);
kmod_module_unref(mod);
return 0;
}
static int command_do(struct kmod_module *module, const char *type,
const char *command, const char *cmdline_opts)
{
@ -727,6 +757,7 @@ static int do_modprobe(int argc, char **orig_argv)
int do_remove = 0;
int do_show_config = 0;
int do_show_modversions = 0;
int do_show_exports = 0;
int err;
argv = prepend_options_from_env(&argc, orig_argv);
@ -783,6 +814,9 @@ static int do_modprobe(int argc, char **orig_argv)
case 4:
do_show_modversions = 1;
break;
case 6:
do_show_exports = 1;
break;
case 'n':
dry_run = 1;
break;
@ -886,6 +920,8 @@ static int do_modprobe(int argc, char **orig_argv)
err = show_config(ctx);
else if (do_show_modversions)
err = show_modversions(ctx, args[0]);
else if (do_show_exports)
err = show_exports(ctx, args[0]);
else if (do_remove)
err = rmmod_all(ctx, args, nargs);
else if (use_all)