| From | Sasha Levin <> | Subject | [PATCH 4.19 083/109] module: limit enabling module.sig_enforce | Date | Mon, 28 Jun 2021 10:32:39 -0400 |
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From: Mimi Zohar <zohar@linux.ibm.com>
[ Upstream commit 0c18f29aae7ce3dadd26d8ee3505d07cc982df75 ]
Irrespective as to whether CONFIG_MODULE_SIG is configured, specifying "module.sig_enforce=1" on the boot command line sets "sig_enforce". Only allow "sig_enforce" to be set when CONFIG_MODULE_SIG is configured.
This patch makes the presence of /sys/module/module/parameters/sig_enforce dependent on CONFIG_MODULE_SIG=y.
Fixes: fda784e50aac ("module: export module signature enforcement status") Reported-by: Nayna Jain <nayna@linux.ibm.com> Tested-by: Mimi Zohar <zohar@linux.ibm.com> Tested-by: Jessica Yu <jeyu@kernel.org> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Jessica Yu <jeyu@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- kernel/module.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/kernel/module.c b/kernel/module.c index 92d8610742c7..68637e661d75 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -268,9 +268,18 @@ static void module_assert_mutex_or_preempt(void) #endif } +#ifdef CONFIG_MODULE_SIG static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); module_param(sig_enforce, bool_enable_only, 0644); +void set_module_sig_enforced(void) +{ + sig_enforce = true; +} +#else +#define sig_enforce false +#endif + /* * Export sig_enforce kernel cmdline parameter to allow other subsystems rely * on that instead of directly to CONFIG_MODULE_SIG_FORCE config. -- 2.30.2
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