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authorLibor Pechacek <lpechacek@suse.com>2016-04-13 11:06:12 +0930
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-10 09:27:14 +0100
commitc819a67f7ee9fafb4dca98c95e4dedfc80b985ad (patch)
parent7e35bc655ec1981b95e0cc97a397c77d437e4eec (diff)
module: Issue warnings when tainting kernel
commit 3205c36cf7d96024626f92d65f560035df1abcb2 upstream. 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 <lpechacek@suse.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 95e73c30fc03..0a56098d3738 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2888,8 +2888,12 @@ 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);
@@ -3054,6 +3058,8 @@ 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
@@ -3072,6 +3078,9 @@ static int check_module_license_and_versions(struct module *mod)
add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
+ if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE))
+ pr_warn("%s: module license taints kernel.\n", mod->name);
if ((mod->num_syms && !mod->crcs)
|| (mod->num_gpl_syms && !mod->gpl_crcs)