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firmware: enable run time change of forcing fallback loader

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Currently one requires to test four kernel configurations to test the
firmware API completely:

0)
  CONFIG_FW_LOADER=y

1)
  o CONFIG_FW_LOADER=y
  o CONFIG_FW_LOADER_USER_HELPER=y

2)
  o CONFIG_FW_LOADER=y
  o CONFIG_FW_LOADER_USER_HELPER=y
  o CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y

3) When CONFIG_FW_LOADER=m the built-in stuff is disabled, we have
   no current tests for this.

We can reduce the requirements to three kernel configurations by making
fw_config.force_sysfs_fallback a proc knob we flip on off. For kernels that
disable CONFIG_IKCONFIG_PROC this can also enable one to inspect if
CONFIG_FW_LOADER_USER_HELPER_FALLBACK was enabled at build time by checking
the proc value at boot time.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luis R. Rodriguez 2018-03-10 06:14:51 -08:00 • committed by Greg Kroah-Hartman
parent 5d6d1ddd27
commit ceb1813224
4 changed files with 32 additions and 1 deletions
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17
drivers/base/firmware_loader/fallback_table.c
View file

@ -19,6 +19,9 @@
/* Module or buit-in */
#ifdef CONFIG_FW_LOADER_USER_HELPER
static unsigned int zero;
static unsigned int one = 1;
struct firmware_fallback_config fw_fallback_config = {
.force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK),
.loading_timeout = 60,
@ -26,4 +29,18 @@ struct firmware_fallback_config fw_fallback_config = {
};
EXPORT_SYMBOL_GPL(fw_fallback_config);
struct ctl_table firmware_config_table[] = {
{
.procname = "force_sysfs_fallback",
.data = &fw_fallback_config.force_sysfs_fallback,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
.extra1 = &zero,
.extra2 = &one,
},
{ }
};
EXPORT_SYMBOL_GPL(firmware_config_table);
#endif