linux-kernel - [PATCH] modpost: detect modules without a MODULE

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Date:   Sun, 12 Nov 2017 11:21:45 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH] modpost: detect modules without a MODULE_LICENSE

From: Randy Dunlap <rdunlap@...radead.org>

Partially revert commit 2fa365682943 (kbuild: soften MODULE_LICENSE check)
so that modpost detects modules that do not have a MODULE_LICENSE.

Sam's commit also changed the fatal error to a warning, which I am
leaving as is.

This gives advance notice of when a module has no license and will taint
the kernel if the module is loaded.

This produces the following warnings on x86_64 allmodconfig:

  MODPOST 6520 modules
WARNING: modpost: missing MODULE_LICENSE() in drivers/auxdisplay/img-ascii-lcd.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/gpio/gpio-ath79.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/gpio/gpio-iop.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/iio/accel/kxsd9-i2c.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/iio/adc/qcom-vadc-common.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/media/platform/mtk-vcodec/mtk-vcodec-common.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/media/platform/soc_camera/soc_scale_crop.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/mtd/nand/denali_pci.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/net/phy/cortina.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/pinctrl/pxa/pinctrl-pxa2xx.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/power/reset/zx-reboot.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/rpmsg/qcom_glink_native.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/staging/comedi/drivers/ni_atmio.o
WARNING: modpost: missing MODULE_LICENSE() in net/9p/9pnet_xen.o
WARNING: modpost: missing MODULE_LICENSE() in sound/soc/codecs/snd-soc-pcm512x-spi.o

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Sam Ravnborg <sam@...nborg.org>
---
 scripts/mod/modpost.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- lnx-414-rc8.orig/scripts/mod/modpost.c
+++ lnx-414-rc8/scripts/mod/modpost.c
@@ -1963,7 +1963,7 @@ static void read_symbols(char *modname)
 	}
 
 	license = get_modinfo(info.modinfo, info.modinfo_len, "license");
-	if (info.modinfo && !license && !is_vmlinux(modname))
+	if (!license && !is_vmlinux(modname))
 		warn("modpost: missing MODULE_LICENSE() in %s\n"
 		     "see include/linux/module.h for "
 		     "more information\n", modname);