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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-12 18:44:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-12 19:01:23 -0800
commit516fb7f2e73dcc303fb97fc3593209fcacf2d982 (patch)
tree9ce9a22e13c85739215c9ceed067a15cd3210cb5 /kernel
parent277642dcca765a1955d4c753a5a315ff7f2eb09d (diff)
download96b-common-516fb7f2e73dcc303fb97fc3593209fcacf2d982.tar.gz
/proc/module: use the same logic as /proc/kallsyms for address exposure
The (alleged) users of the module addresses are the same: kernel profiling. So just expose the same helper and format macros, and unify the logic. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/kallsyms.c8
-rw-r--r--kernel/module.c20
2 files changed, 19 insertions, 9 deletions
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 51b49ed452e4..1e6ae66c6244 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -581,12 +581,6 @@ static void s_stop(struct seq_file *m, void *p)
{
}
-#ifndef CONFIG_64BIT
-# define KALLSYM_FMT "%08lx"
-#else
-# define KALLSYM_FMT "%016lx"
-#endif
-
static int s_show(struct seq_file *m, void *p)
{
unsigned long value;
@@ -640,7 +634,7 @@ static inline int kallsyms_for_perf(void)
* Otherwise, require CAP_SYSLOG (assuming kptr_restrict isn't set to
* block even that).
*/
-static int kallsyms_show_value(void)
+int kallsyms_show_value(void)
{
switch (kptr_restrict) {
case 0:
diff --git a/kernel/module.c b/kernel/module.c
index fdb3a6aca363..0122747ba150 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4147,6 +4147,7 @@ static int m_show(struct seq_file *m, void *p)
{
struct module *mod = list_entry(p, struct module, list);
char buf[MODULE_FLAGS_BUF_SIZE];
+ unsigned long value;
/* We always ignore unformed modules. */
if (mod->state == MODULE_STATE_UNFORMED)
@@ -4162,7 +4163,8 @@ static int m_show(struct seq_file *m, void *p)
mod->state == MODULE_STATE_COMING ? "Loading" :
"Live");
/* Used by oprofile and other similar tools. */
- seq_printf(m, " 0x%pK", mod->core_layout.base);
+ value = m->private ? 0 : (unsigned long)mod->core_layout.base;
+ seq_printf(m, " 0x" KALLSYM_FMT, value);
/* Taints info */
if (mod->taints)
@@ -4184,9 +4186,23 @@ static const struct seq_operations modules_op = {
.show = m_show
};
+/*
+ * This also sets the "private" pointer to non-NULL if the
+ * kernel pointers should be hidden (so you can just test
+ * "m->private" to see if you should keep the values private).
+ *
+ * We use the same logic as for /proc/kallsyms.
+ */
static int modules_open(struct inode *inode, struct file *file)
{
- return seq_open(file, &modules_op);
+ int err = seq_open(file, &modules_op);
+
+ if (!err) {
+ struct seq_file *m = file->private_data;
+ m->private = kallsyms_show_value() ? NULL : (void *)8ul;
+ }
+
+ return 0;
}
static const struct file_operations proc_modules_operations = {