modules: return licensing information from find_symbol

commit ef1dac6021cc8ec5de02ce31722bf26ac4ed5523 upstream.

Report the GPLONLY status through a new argument.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/module.h b/include/linux/module.h
index 4fbee306ea82a8ed8de545f5bd4715df4ca7640b..93392b24b8475d8d5caa8b9b22a71a962b2d33d0 100644 (file)
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -529,7 +529,7 @@ struct module *find_module(const char *name);
 struct symsearch {
        const struct kernel_symbol *start, *stop;
        const s32 *crcs;
-       enum {
+       enum mod_license {
                NOT_GPL_ONLY,
                GPL_ONLY,
                WILL_BE_GPL_ONLY,

diff --git a/kernel/module.c b/kernel/module.c
index 14f81291c6828fbd87115e161105bc370ac467c7..4a2fa74fa7f8feb159843e76d1e027c11305d37f 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -487,6 +487,7 @@ struct find_symbol_arg {
        struct module *owner;
        const s32 *crc;
        const struct kernel_symbol *sym;
+       enum mod_license license;
 };
 
 static bool check_symbol(const struct symsearch *syms,
@@ -520,6 +521,7 @@ static bool check_symbol(const struct symsearch *syms,
        fsa->owner = owner;
        fsa->crc = symversion(syms->crcs, symnum);
        fsa->sym = &syms->start[symnum];
+       fsa->license = syms->license;
        return true;
 }
 
@@ -570,6 +572,7 @@ static bool find_symbol_in_section(const struct symsearch *syms,
 static const struct kernel_symbol *find_symbol(const char *name,
                                        struct module **owner,
                                        const s32 **crc,
+                                       enum mod_license *license,
                                        bool gplok,
                                        bool warn)
 {
@@ -584,6 +587,8 @@ static const struct kernel_symbol *find_symbol(const char *name,
                        *owner = fsa.owner;
                if (crc)
                        *crc = fsa.crc;
+               if (license)
+                       *license = fsa.license;
                return fsa.sym;
        }
 
@@ -1056,7 +1061,7 @@ void __symbol_put(const char *symbol)
        struct module *owner;
 
        preempt_disable();
-       if (!find_symbol(symbol, &owner, NULL, true, false))
+       if (!find_symbol(symbol, &owner, NULL, NULL, true, false))
                BUG();
        module_put(owner);
        preempt_enable();
@@ -1334,7 +1339,7 @@ static inline int check_modstruct_version(const struct load_info *info,
         * locking is necessary -- use preempt_disable() to placate lockdep.
         */
        preempt_disable();
-       if (!find_symbol("module_layout", NULL, &crc, true, false)) {
+       if (!find_symbol("module_layout", NULL, &crc, NULL, true, false)) {
                preempt_enable();
                BUG();
        }
@@ -1383,6 +1388,7 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod,
        struct module *owner;
        const struct kernel_symbol *sym;
        const s32 *crc;
+       enum mod_license license;
        int err;
 
        /*
@@ -1392,7 +1398,7 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod,
         */
        sched_annotate_sleep();
        mutex_lock(&module_mutex);
-       sym = find_symbol(name, &owner, &crc,
+       sym = find_symbol(name, &owner, &crc, &license,
                          !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
        if (!sym)
                goto unlock;
@@ -2222,7 +2228,7 @@ void *__symbol_get(const char *symbol)
        const struct kernel_symbol *sym;
 
        preempt_disable();
-       sym = find_symbol(symbol, &owner, NULL, true, true);
+       sym = find_symbol(symbol, &owner, NULL, NULL, true, true);
        if (sym && strong_try_module_get(owner))
                sym = NULL;
        preempt_enable();
@@ -2258,7 +2264,7 @@ static int verify_export_symbols(struct module *mod)
        for (i = 0; i < ARRAY_SIZE(arr); i++) {
                for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
                        if (find_symbol(kernel_symbol_name(s), &owner, NULL,
-                                       true, false)) {
+                                       NULL, true, false)) {
                                pr_err("%s: exports duplicate symbol %s"
                                       " (owned by %s)\n",
                                       mod->name, kernel_symbol_name(s),