On Mon, Nov 12, 2018 at 7:48 AM Yauheni Kaliuta
<yauheni.kaliuta@xxxxxxxxxx> wrote:
>
> 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 1e48901166ef 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@xxxxxxxxxx>
> ---
> tools/modprobe.c | 38 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 38 insertions(+)
>
> diff --git a/tools/modprobe.c b/tools/modprobe.c
> index 43605ccaf0f0..ca161d09940c 100644
> --- a/tools/modprobe.c
> +++ b/tools/modprobe.c
> @@ -76,6 +76,8 @@ 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},
> + {"dump-exports", no_argument, 0, 6},
>
> {"dry-run", no_argument, 0, 'n'},
> {"show", no_argument, 0, 'n'},
> @@ -124,6 +126,8 @@ 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 Dump module exported symbol versions and exit\n"
> + "\t --dump-exports Same as --show-exports\n"
all the others are show-*. The dump-* and show* should be considered
aliases for compatibility. So I don't think we need that on a new one.
Lucas De Marchi
> "\n"
> "General Options:\n"
> "\t-n, --dry-run Do not execute operations, just print out\n"
> @@ -232,6 +236,34 @@ 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 +759,7 @@ 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 +816,9 @@ 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 +922,8 @@ 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)
> --
> 2.19.1
>
