Messages in this thread Patch in this message | | | Date | Fri, 11 Jan 2013 20:44:53 +1100 | From | Chris Samuel <> | Subject | [PATCH] MODSIGN: Warn when sign check fails due to -ENOKEY |
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Currently if a signature check fails on module load due to not having the appropriate key (-ENOKEY) and we are not doing strict checking there is no information provided to the user other than the lock debug taint warning:
Disabling lock debugging due to kernel taint
This patch causes a single warning to be emitted to explain why the kernel is being tainted, before the above taint warning occurs.
Module verification failed, required key not present, tainting kernel
Found whilst trying to work out why all the 3.8 development kernels I was building and testing were warning about taints and why all modules were listed as forced load (F) in /proc/modules when that wasn't the case in the 3.5, 3.6 or 3.7 kernels I'd tried.
Signed-off-by: Christopher Samuel <chris@csamuel.org> --- kernel/module.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/module.c b/kernel/module.c index 250092c..27de534 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2443,8 +2443,10 @@ static int module_sig_check(struct load_info *info) if (err < 0 && fips_enabled) panic("Module verification failed with error %d in FIPS mode\n", err); - if (err == -ENOKEY && !sig_enforce) + if (err == -ENOKEY && !sig_enforce) { + printk_once(KERN_DEBUG "Module verification failed, required key not present, tainting kernel\n"); err = 0; + } return err; } -- 1.7.10.4
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