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libsystemd provides a sd_id128_get_machine_app_specific() function that
allows deriving an application specific UUID without directly leaking
the machine ID.
Let's provide an equivalent for barebox that will be used in a following
commit to generate a stable MAC instead of randomizing it.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20231122094747.340825-2-uwe@kleine-koenig.org
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Add the possibility for reusing the registered
hashables for other functions beside machine id
and the truncated sha1 it offers.
Signed-off-by: Christian Melki <christian.melki@t2data.com>
Link: https://lore.barebox.org/20231017191833.1092768-1-christian.melki@t2data.com
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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All callsites of digest_alloc(_by_algo) check for NULL pointer before
proceeding except for machine_id_set_globalvar(). Fix this to fail
more gracefully instead of the crash I ran into.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20220808062010.390394-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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We don't need the goto if we haven't done anything to clean up anyway.
also globalvar_add_simple("machine_id", NULL) is a no-op when we have
just called globalvar_add_simple above with an actual argument.
It doesn't clean the parameter, nor should it, because the code is
executed for the successful code as well and there is nothing that can
fail that late.
This slightly alters behavior: Whereas before $global.machine_id was
always defined when CONFIG_MACHINE_ID is enabled, it's now only
defined when it's non-empty.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20220808062010.390394-1-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The Kconfig help text as well the function name
machine_id_set_bootarg() suggest that enabling the Kconfig option is
sufficient to have barebox pass the machine id to the kernel.
This is not the case, so change the naming/documentation to make this
clearer.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: Bastian Krause <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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BAREBOX_MAGICVAR now generates a unique identifier automatically,
so we can convert users of BAREBOX_MAGICVAR_NAMED to the simpler
BAREBOX_MAGICVAR macro.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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This patch adds functionality to pass device-specific information that
will be hashed to generate a persistent unique machine id. It is then
available as global.machine_id. It can be overwritten with
nv.machine_id if necessary. Passing the machine id to the kernel is
done in a separate patch.
Note: if multiple sources provide hashable device-specific information
(via machine_id_set_hashable()) the information provided by the last call
prior to the late initcall set_machine_id() is used to generate the
machine id from. Thus when updating barebox the machine id might change.
Signed-off-by: Bastian Krause <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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