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/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>
This commit is contained in:
Linus Torvalds 2017-11-12 18:44:23 -08:00
parent 277642dcca
commit 516fb7f2e7
3 changed files with 27 additions and 9 deletions
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8
include/linux/kallsyms.h
View File

@ -14,6 +14,14 @@
#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
/* How and when do we show kallsyms values? */
extern int kallsyms_show_value(void);
#ifndef CONFIG_64BIT
# define KALLSYM_FMT "%08lx"
#else
# define KALLSYM_FMT "%016lx"
#endif
struct module;
#ifdef CONFIG_KALLSYMS

8
kernel/kallsyms.c
View File

@ -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:

20
kernel/module.c
View File

@ -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 = {