This is a note to let you know that I've just added the patch titled
module: Issue warnings when tainting kernel
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
module-issue-warnings-when-tainting-kernel.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3205c36cf7d96024626f92d65f560035df1abcb2 Mon Sep 17 00:00:00 2001
From: Libor Pechacek <lpechacek@xxxxxxxx>
Date: Wed, 13 Apr 2016 11:06:12 +0930
Subject: module: Issue warnings when tainting kernel
From: Libor Pechacek <lpechacek@xxxxxxxx>
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@xxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/module.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2888,8 +2888,12 @@ static int check_modinfo(struct module *
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 *mo
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_vers
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)
Patches currently in stable-queue which might be from lpechacek@xxxxxxxx are
queue-4.4/module-issue-warnings-when-tainting-kernel.patch