kallsyms_show_value return false if KALLSYMS is disabled,
but it's used in module.c also.
Thus when KALLSYMS is disabled, system will not print module
load address:
/ # insmod crash.ko
/ # lsmod
crash 12288 0 - Live 0x0000000000000000 (O)
After change (making definition generic)
============
/ # lsmod
crash 12288 0 - Live 0xffff800000ec0000 (O)
/ # cat /proc/modules
crash 12288 0 - Live 0xffff800000ec0000 (O)
/ #
Co-developed-by: Onkarnath <[email protected]>
Signed-off-by: Onkarnath <[email protected]>
Signed-off-by: Maninder Singh <[email protected]>
---
include/linux/kallsyms.h | 11 +++--------
kernel/kallsyms.c | 35 -----------------------------------
lib/vsprintf.c | 36 ++++++++++++++++++++++++++++++++++++
3 files changed, 39 insertions(+), 43 deletions(-)
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index e5ad6e31697d..efabb8c18492 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -24,6 +24,9 @@
struct cred;
struct module;
+/* How and when do we show kallsyms values? */
+extern bool kallsyms_show_value(const struct cred *cred);
+
static inline int is_kernel_text(unsigned long addr)
{
if (__is_kernel_text(addr))
@@ -93,9 +96,6 @@ extern int sprint_backtrace_build_id(char *buffer, unsigned long address);
int lookup_symbol_name(unsigned long addr, char *symname);
int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
-/* How and when do we show kallsyms values? */
-extern bool kallsyms_show_value(const struct cred *cred);
-
#else /* !CONFIG_KALLSYMS */
static inline unsigned long kallsyms_lookup_name(const char *name)
@@ -158,11 +158,6 @@ static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, u
return -ERANGE;
}
-static inline bool kallsyms_show_value(const struct cred *cred)
-{
- return false;
-}
-
#endif /*CONFIG_KALLSYMS*/
static inline void print_ip_sym(const char *loglvl, unsigned long ip)
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index e8d2262ef2d2..71ef15ba20c7 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -818,41 +818,6 @@ static const struct seq_operations kallsyms_op = {
.show = s_show
};
-static inline int kallsyms_for_perf(void)
-{
-#ifdef CONFIG_PERF_EVENTS
- extern int sysctl_perf_event_paranoid;
- if (sysctl_perf_event_paranoid <= 1)
- return 1;
-#endif
- return 0;
-}
-
-/*
- * We show kallsyms information even to normal users if we've enabled
- * kernel profiling and are explicitly not paranoid (so kptr_restrict
- * is clear, and sysctl_perf_event_paranoid isn't set).
- *
- * Otherwise, require CAP_SYSLOG (assuming kptr_restrict isn't set to
- * block even that).
- */
-bool kallsyms_show_value(const struct cred *cred)
-{
- switch (kptr_restrict) {
- case 0:
- if (kallsyms_for_perf())
- return true;
- fallthrough;
- case 1:
- if (security_capable(cred, &init_user_ns, CAP_SYSLOG,
- CAP_OPT_NOAUDIT) == 0)
- return true;
- fallthrough;
- default:
- return false;
- }
-}
-
static int kallsyms_open(struct inode *inode, struct file *file)
{
/*
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 49ef55ffabd7..4bc96a4f3a00 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -870,6 +870,42 @@ static char *default_pointer(char *buf, char *end, const void *ptr,
int kptr_restrict __read_mostly;
+static inline int kallsyms_for_perf(void)
+{
+#ifdef CONFIG_PERF_EVENTS
+ extern int sysctl_perf_event_paranoid;
+
+ if (sysctl_perf_event_paranoid <= 1)
+ return 1;
+#endif
+ return 0;
+}
+
+/*
+ * We show kallsyms information even to normal users if we've enabled
+ * kernel profiling and are explicitly not paranoid (so kptr_restrict
+ * is clear, and sysctl_perf_event_paranoid isn't set).
+ *
+ * Otherwise, require CAP_SYSLOG (assuming kptr_restrict isn't set to
+ * block even that).
+ */
+bool kallsyms_show_value(const struct cred *cred)
+{
+ switch (kptr_restrict) {
+ case 0:
+ if (kallsyms_for_perf())
+ return true;
+ fallthrough;
+ case 1:
+ if (security_capable(cred, &init_user_ns, CAP_SYSLOG,
+ CAP_OPT_NOAUDIT) == 0)
+ return true;
+ fallthrough;
+ default:
+ return false;
+ }
+}
+
static noinline_for_stack
char *restricted_pointer(char *buf, char *end, const void *ptr,
struct printf_spec spec)
--
2.17.1