module,bug: Add TAINT_OOT_MODULE flag for modules not built in-tree

Use of the GPL or a compatible licence doesn't necessarily make the code
any good.  We already consider staging modules to be suspect, and this
should also be true for out-of-tree modules which may receive very
little review.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reviewed-by: Dave Jones <davej@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (patched oops-tracing.txt)

5 files changed, 17 insertions, 0 deletions

diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt
index 6fe9001b9263..13032c0140d4 100644
--- a/Documentation/oops-tracing.txt
+++ b/Documentation/oops-tracing.txt
@@ -263,6 +263,8 @@ characters, each representing a particular tainted value.
  12: 'I' if the kernel is working around a severe bug in the platform
      firmware (BIOS or similar).
 
+ 13: 'O' if an externally-built ("out-of-tree") module has been loaded.
+
 The primary reason for the 'Tainted: ' string is to tell kernel
 debuggers if this is a clean kernel or if anything unusual has
 occurred.  Tainting is permanent: even if an offending module is
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4c0d3b2fd5fc..e8b1597b5cf2 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -371,6 +371,7 @@ extern enum system_states {
 #define TAINT_WARN                      9
 #define TAINT_CRAP                      10
 #define TAINT_FIRMWARE_WORKAROUND       11
+#define TAINT_OOT_MODULE                12
 
 extern const char hex_asc[];
 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
diff --git a/kernel/module.c b/kernel/module.c
index 3c5509642847..ef8cb70c6996 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2487,6 +2487,9 @@ static int check_modinfo(struct module *mod, struct load_info *info)
                 return -ENOEXEC;
         }
 
+        if (!get_modinfo(info, "intree"))
+                add_taint_module(mod, TAINT_OOT_MODULE);
+
         if (get_modinfo(info, "staging")) {
                 add_taint_module(mod, TAINT_CRAP);
                 printk(KERN_WARNING "%s: module is from the staging directory,"
@@ -3255,6 +3258,8 @@ static char *module_flags(struct module *mod, char *buf)
                 buf[bx++] = '(';
                 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
                         buf[bx++] = 'P';
+                else if (mod->taints & (1 << TAINT_OOT_MODULE))
+                        buf[bx++] = 'O';
                 if (mod->taints & (1 << TAINT_FORCED_MODULE))
                         buf[bx++] = 'F';
                 if (mod->taints & (1 << TAINT_CRAP))
diff --git a/kernel/panic.c b/kernel/panic.c
index d7bb6974efb5..b26593604214 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -177,6 +177,7 @@ static const struct tnt tnts[] = {
         { TAINT_WARN,                   'W', ' ' },
         { TAINT_CRAP,                   'C', ' ' },
         { TAINT_FIRMWARE_WORKAROUND,    'I', ' ' },
+        { TAINT_OOT_MODULE,             'O', ' ' },
 };
 
 /**
@@ -194,6 +195,7 @@ static const struct tnt tnts[] = {
  *  'W' - Taint on warning.
  *  'C' - modules from drivers/staging are loaded.
  *  'I' - Working around severe firmware bug.
+ *  'O' - Out-of-tree module has been loaded.
  *
  *      The string is overwritten by the next call to print_tainted().
  */
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index a509ff8f32fa..2bd594e6d1b4 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1849,6 +1849,12 @@ static void add_header(struct buffer *b, struct module *mod)
         buf_printf(b, "};\n");
 }
 
+static void add_intree_flag(struct buffer *b, int is_intree)
+{
+        if (is_intree)
+                buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
+}
+
 static void add_staging_flag(struct buffer *b, const char *name)
 {
         static const char *staging_dir = "drivers/staging";
@@ -2169,6 +2175,7 @@ int main(int argc, char **argv)
                 buf.pos = 0;
 
                 add_header(&buf, mod);
+                add_intree_flag(&buf, !external_module);
                 add_staging_flag(&buf, mod->name);
                 err |= add_versions(&buf, mod);
                 add_depends(&buf, mod, modules);