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Message-Id: <20210520092123.834642529@linuxfoundation.org>
Date: Thu, 20 May 2021 11:20:01 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
Jessica Yu <jeyu@...nel.org>
Subject: [PATCH 4.14 109/323] modules: return licensing information from find_symbol
From: Christoph Hellwig <hch@....de>
commit ef1dac6021cc8ec5de02ce31722bf26ac4ed5523 upstream.
Report the GPLONLY status through a new argument.
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jessica Yu <jeyu@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
include/linux/module.h | 2 +-
kernel/module.c | 16 +++++++++++-----
2 files changed, 12 insertions(+), 6 deletions(-)
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -522,7 +522,7 @@ struct module *find_module(const char *n
struct symsearch {
const struct kernel_symbol *start, *stop;
const s32 *crcs;
- enum {
+ enum mod_license {
NOT_GPL_ONLY,
GPL_ONLY,
WILL_BE_GPL_ONLY,
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -502,6 +502,7 @@ 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,
@@ -535,6 +536,7 @@ static bool check_symbol(const struct sy
fsa->owner = owner;
fsa->crc = symversion(syms->crcs, symnum);
fsa->sym = &syms->start[symnum];
+ fsa->license = syms->license;
return true;
}
@@ -567,6 +569,7 @@ static bool find_symbol_in_section(const
static const struct kernel_symbol *find_symbol(const char *name,
struct module **owner,
const s32 **crc,
+ enum mod_license *license,
bool gplok,
bool warn)
{
@@ -581,6 +584,8 @@ static const struct kernel_symbol *find_
*owner = fsa.owner;
if (crc)
*crc = fsa.crc;
+ if (license)
+ *license = fsa.license;
return fsa.sym;
}
@@ -1055,7 +1060,7 @@ 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_versio
*/
preempt_disable();
if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
- &crc, true, false)) {
+ &crc, NULL, true, false)) {
preempt_enable();
BUG();
}
@@ -1384,6 +1389,7 @@ static const struct kernel_symbol *resol
struct module *owner;
const struct kernel_symbol *sym;
const s32 *crc;
+ enum mod_license license;
int err;
/*
@@ -1393,7 +1399,7 @@ static const struct kernel_symbol *resol
*/
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;
@@ -2197,7 +2203,7 @@ 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();
@@ -2232,7 +2238,7 @@ static int verify_export_symbols(struct
for (i = 0; i < ARRAY_SIZE(arr); i++) {
for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
- if (find_symbol(s->name, &owner, NULL, true, false)) {
+ if (find_symbol(s->name, &owner, NULL, NULL, true, false)) {
pr_err("%s: exports duplicate symbol %s"
" (owned by %s)\n",
mod->name, s->name, module_name(owner));
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