From 3205c36cf7d96024626f92d65f560035df1abcb2 Mon Sep 17 00:00:00 2001 From: Libor Pechacek Date: Wed, 13 Apr 2016 11:06:12 +0930 Subject: [PATCH] module: Issue warnings when tainting kernel While most of the locations where a kernel taint bit is set are accompanied with a warning message, there are two which set their bits silently. If the tainting module gets unloaded later on, it is almost impossible to tell what was the reason for setting the flag. Signed-off-by: Libor Pechacek Signed-off-by: Rusty Russell --- kernel/module.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/kernel/module.c b/kernel/module.c index 9e04a4210a4a..0b4f3a85d4fc 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2919,8 +2919,12 @@ static int check_modinfo(struct module *mod, struct load_info *info, int flags) return -ENOEXEC; } - if (!get_modinfo(info, "intree")) + if (!get_modinfo(info, "intree")) { + if (!test_taint(TAINT_OOT_MODULE)) + pr_warn("%s: loading out-of-tree module taints kernel.\n", + mod->name); add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); + } if (get_modinfo(info, "staging")) { add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); @@ -3089,6 +3093,8 @@ static int move_module(struct module *mod, struct load_info *info) static int check_module_license_and_versions(struct module *mod) { + int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); + /* * ndiswrapper is under GPL by itself, but loads proprietary modules. * Don't use add_taint_module(), as it would prevent ndiswrapper from @@ -3107,6 +3113,9 @@ static int check_module_license_and_versions(struct module *mod) add_taint_module(mod, TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); + if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) + pr_warn("%s: module license taints kernel.\n", mod->name); + #ifdef CONFIG_MODVERSIONS if ((mod->num_syms && !mod->crcs) || (mod->num_gpl_syms && !mod->gpl_crcs)