[PATCH 20/27] Lock down module params that specify hardware parameters (eg. ioport)

[Matthew Garrett]

From: David Howells <dhowe...@redhat.com>

Provided an annotation for module parameters that specify hardware
parameters (such as io ports, iomem addresses, irqs, dma channels, fixed
dma buffers and other types).

Suggested-by: Alan Cox <gno...@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowe...@redhat.com>
---
 kernel/params.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/kernel/params.c b/kernel/params.c
index ce89f757e6da..8ac751c938f8 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -108,13 +108,19 @@ bool parameq(const char *a, const char *b)
        return parameqn(a, b, strlen(a)+1);
 }
 
-static void param_check_unsafe(const struct kernel_param *kp)
+static bool param_check_unsafe(const struct kernel_param *kp,
+                              const char *doing)
 {
        if (kp->flags & KERNEL_PARAM_FL_UNSAFE) {
                pr_notice("Setting dangerous option %s - tainting kernel\n",
                          kp->name);
                add_taint(TAINT_USER, LOCKDEP_STILL_OK);
        }
+
+       if (kp->flags & KERNEL_PARAM_FL_HWPARAM &&
+           kernel_is_locked_down("Command line-specified device addresses, 
irqs and dma channels"))
+               return false;
+       return true;
 }
 
 static int parse_one(char *param,
@@ -144,8 +150,10 @@ static int parse_one(char *param,
                        pr_debug("handling %s with %p\n", param,
                                params[i].ops->set);
                        kernel_param_lock(params[i].mod);
-                       param_check_unsafe(&params[i]);
-                       err = params[i].ops->set(val, &params[i]);
+                       if (param_check_unsafe(&params[i], doing))
+                               err = params[i].ops->set(val, &params[i]);
+                       else
+                               err = -EPERM;
                        kernel_param_unlock(params[i].mod);
                        return err;
                }
@@ -553,6 +561,12 @@ static ssize_t param_attr_show(struct module_attribute 
*mattr,
        return count;
 }
 
+#ifdef CONFIG_MODULES
+#define mod_name(mod) (mod)->name
+#else
+#define mod_name(mod) "unknown"
+#endif
+
 /* sysfs always hands a nul-terminated string in buf.  We rely on that. */
 static ssize_t param_attr_store(struct module_attribute *mattr,
                                struct module_kobject *mk,
@@ -565,8 +579,10 @@ static ssize_t param_attr_store(struct module_attribute 
*mattr,
                return -EPERM;
 
        kernel_param_lock(mk->mod);
-       param_check_unsafe(attribute->param);
-       err = attribute->param->ops->set(buf, attribute->param);
+       if (param_check_unsafe(attribute->param, mod_name(mk->mod)))
+               err = attribute->param->ops->set(buf, attribute->param);
+       else
+               err = -EPERM;
        kernel_param_unlock(mk->mod);
        if (!err)
                return len;
-- 
2.21.0.352.gf09ad66450-goog