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module: Issue warnings when tainting kernel

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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>
This commit is contained in:
Libor Pechacek 2016-04-13 11:06:12 +09:30 committed by Rusty Russell
parent c75b590d60
commit 3205c36cf7
1 changed files with 10 additions and 1 deletions
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11
kernel/module.c
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@ -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)