* [PATCH] modprobe: add --show-exports
@ 2018-11-08 11:56 Yauheni Kaliuta
2018-11-08 12:28 ` Yauheni Kaliuta
0 siblings, 1 reply; 3+ messages in thread
From: Yauheni Kaliuta @ 2018-11-08 11:56 UTC (permalink / raw)
To: linux-modules; +Cc: Lucas De Marchi
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.
It refactors the --show-modversions code to avoid duplications.
Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
---
tools/modprobe.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/tools/modprobe.c b/tools/modprobe.c
index 43605ccaf0f0..97da4e6986ce 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"
"\n"
"General Options:\n"
"\t-n, --dry-run Do not execute operations, just print out\n"
@@ -204,7 +208,9 @@ static int show_config(struct kmod_ctx *ctx)
return 0;
}
-static int show_modversions(struct kmod_ctx *ctx, const char *filename)
+static int show_versions(struct kmod_ctx *ctx,
+ int (*get_versions_f)(const struct kmod_module *, struct kmod_list **),
+ const char *filename)
{
struct kmod_list *l, *list = NULL;
struct kmod_module *mod;
@@ -214,7 +220,7 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
return err;
}
- err = kmod_module_get_versions(mod, &list);
+ err = get_versions_f(mod, &list);
if (err < 0) {
LOG("could not get modversions of %s: %s\n",
filename, strerror(-err));
@@ -232,6 +238,16 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
return 0;
}
+static int show_modversions(struct kmod_ctx *ctx, const char *filename)
+{
+ return show_versions(ctx, kmod_module_get_versions, filename);
+}
+
+static int show_exports(struct kmod_ctx *ctx, const char *filename)
+{
+ return show_versions(ctx, kmod_module_get_symbols, filename);
+}
+
static int command_do(struct kmod_module *module, const char *type,
const char *command, const char *cmdline_opts)
{
@@ -727,6 +743,7 @@ 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 +800,9 @@ 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 +906,8 @@ 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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] modprobe: add --show-exports
2018-11-08 11:56 [PATCH] modprobe: add --show-exports Yauheni Kaliuta
@ 2018-11-08 12:28 ` Yauheni Kaliuta
2018-11-12 23:01 ` Lucas De Marchi
0 siblings, 1 reply; 3+ messages in thread
From: Yauheni Kaliuta @ 2018-11-08 12:28 UTC (permalink / raw)
To: linux-modules; +Cc: Lucas De Marchi
Hi!
Actually it doesn't sound good because of the API:
[...]
kmod_module_versions_free_list(list);
kmod_module_unref(mod);
It is supposed that the list produced by
kmod_module_get_versions() only, not kmod_module_get_symbols(),
even if the structures actually have the same fields.
Would it be good if I change the internals a bit, to use only
struct kmod_module_symbol (it is possible to keep external API
the same for compatibility)?
Or there are reasons to keep them different now?
>>>>> On Thu, 8 Nov 2018 13:56:37 +0200, Yauheni Kaliuta 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.
> It refactors the --show-modversions code to avoid duplications.
> Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
> ---
> tools/modprobe.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
> diff --git a/tools/modprobe.c b/tools/modprobe.c
> index 43605ccaf0f0..97da4e6986ce 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"
> "\n"
> "General Options:\n"
> "\t-n, --dry-run Do not execute operations, just print out\n"
> @@ -204,7 +208,9 @@ static int show_config(struct kmod_ctx *ctx)
> return 0;
> }
> -static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> +static int show_versions(struct kmod_ctx *ctx,
> + int (*get_versions_f)(const struct kmod_module *, struct kmod_list **),
> + const char *filename)
> {
> struct kmod_list *l, *list = NULL;
> struct kmod_module *mod;
> @@ -214,7 +220,7 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> return err;
> }
> - err = kmod_module_get_versions(mod, &list);
> + err = get_versions_f(mod, &list);
> if (err < 0) {
> LOG("could not get modversions of %s: %s\n",
> filename, strerror(-err));
> @@ -232,6 +238,16 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> return 0;
> }
> +static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> +{
> + return show_versions(ctx, kmod_module_get_versions, filename);
> +}
> +
> +static int show_exports(struct kmod_ctx *ctx, const char *filename)
> +{
> + return show_versions(ctx, kmod_module_get_symbols, filename);
> +}
> +
> static int command_do(struct kmod_module *module, const char *type,
> const char *command, const char *cmdline_opts)
> {
> @@ -727,6 +743,7 @@ 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 +800,9 @@ 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 +906,8 @@ 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
--
WBR,
Yauheni Kaliuta
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] modprobe: add --show-exports
2018-11-08 12:28 ` Yauheni Kaliuta
@ 2018-11-12 23:01 ` Lucas De Marchi
0 siblings, 0 replies; 3+ messages in thread
From: Lucas De Marchi @ 2018-11-12 23:01 UTC (permalink / raw)
To: Yauheni Kaliuta; +Cc: linux-modules, Lucas De Marchi
On Thu, Nov 8, 2018 at 4:29 AM Yauheni Kaliuta
<yauheni.kaliuta@redhat.com> wrote:
>
> Hi!
>
> Actually it doesn't sound good because of the API:
>
> [...]
>
> kmod_module_versions_free_list(list);
> kmod_module_unref(mod);
>
> It is supposed that the list produced by
> kmod_module_get_versions() only, not kmod_module_get_symbols(),
> even if the structures actually have the same fields.
>
> Would it be good if I change the internals a bit, to use only
> struct kmod_module_symbol (it is possible to keep external API
> the same for compatibility)?
it's in the TODO file:
* review API, maybe unify all of these getters:
- kmod_module_version_get_symbol()
- kmod_module_version_get_crc()
- kmod_module_symbol_get_symbol()
- kmod_module_symbol_get_crc()
- kmod_module_dependency_symbol_get_symbol()
- kmod_module_dependency_symbol_get_crc()
- kmod_module_versions_free_list()
- kmod_module_symbols_free_list()
- kmod_module_dependency_symbols_free_list()
However this means breaking API, so it was never a great appeal. Maybe
we could add new ones
and keep the old functions for compatibility.
Lucas De Marchi
>
> Or there are reasons to keep them different now?
>
> >>>>> On Thu, 8 Nov 2018 13:56:37 +0200, Yauheni Kaliuta 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.
>
> > It refactors the --show-modversions code to avoid duplications.
>
> > Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
> > ---
> > tools/modprobe.c | 26 ++++++++++++++++++++++++--
> > 1 file changed, 24 insertions(+), 2 deletions(-)
>
> > diff --git a/tools/modprobe.c b/tools/modprobe.c
> > index 43605ccaf0f0..97da4e6986ce 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"
> > "\n"
> > "General Options:\n"
> > "\t-n, --dry-run Do not execute operations, just print out\n"
> > @@ -204,7 +208,9 @@ static int show_config(struct kmod_ctx *ctx)
> > return 0;
> > }
>
> > -static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> > +static int show_versions(struct kmod_ctx *ctx,
> > + int (*get_versions_f)(const struct kmod_module *, struct kmod_list **),
> > + const char *filename)
> > {
> > struct kmod_list *l, *list = NULL;
> > struct kmod_module *mod;
> > @@ -214,7 +220,7 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> > return err;
> > }
>
> > - err = kmod_module_get_versions(mod, &list);
> > + err = get_versions_f(mod, &list);
> > if (err < 0) {
> > LOG("could not get modversions of %s: %s\n",
> > filename, strerror(-err));
> > @@ -232,6 +238,16 @@ static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> > return 0;
> > }
>
> > +static int show_modversions(struct kmod_ctx *ctx, const char *filename)
> > +{
> > + return show_versions(ctx, kmod_module_get_versions, filename);
> > +}
> > +
> > +static int show_exports(struct kmod_ctx *ctx, const char *filename)
> > +{
> > + return show_versions(ctx, kmod_module_get_symbols, filename);
> > +}
> > +
> > static int command_do(struct kmod_module *module, const char *type,
> > const char *command, const char *cmdline_opts)
> > {
> > @@ -727,6 +743,7 @@ 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 +800,9 @@ 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 +906,8 @@ 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
>
>
> --
> WBR,
> Yauheni Kaliuta
--
Lucas De Marchi
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-11-08 11:56 [PATCH] modprobe: add --show-exports Yauheni Kaliuta
2018-11-08 12:28 ` Yauheni Kaliuta
2018-11-12 23:01 ` Lucas De Marchi
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