Re: [PATCH] module: Add more error message for failed kernel module loading

[Jessica Yu]

+++ Qu Wenruo [02/09/20 14:46 +0800]:
> When kernel module loading failed, user space only get one of the
> following error messages:
>
> - ENOEXEC
>  This is the most confusing one. From corrupted ELF header to bad
>  WRITE|EXEC flags check introduced by in module_enforce_rwx_sections()
>  all returns this error number.
>
> - EPERM
>  This is for blacklisted modules. But mod doesn't do extra explain
>  on this error either.
>
> - ENOMEM
>  The only error which needs no explain.
>
> This means, if a user got "Exec format error" from modprobe, it provides
> no meaningful way for the user to debug, and will take extra time
> communicating to get extra info.
>
> So this patch will add extra error messages for -ENOEXEC and -EPERM
> errors, allowing user to do better debugging and reporting.
>
> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
> Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>

Applied, thanks.

Jessica