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

Ben Hutchings
2011-10-24T13:12:43Z

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>
---
Debian has been carrying this for the last few kernel versions. The
recent thread '[RFC] virtualbox tainting.' and discussions at KS suggest
that this might be more generally useful.

Ben.

include/linux/kernel.h | 1 +
kernel/module.c | 5 +++++
kernel/panic.c | 2 ++
scripts/mod/modpost.c | 7 +++++++
4 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 46ac9a5..2c05967 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -369,6 +369,7 @@ 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 04379f92..c0872f1 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,"
@@ -3257,6 +3260,8 @@ 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 d7bb697..b2659360 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 a509ff8..2bd594e 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);
--
1.7.7