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authorLinus Torvalds <torvalds@linux-foundation.org>2021-07-11 20:06:09 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-11 20:06:09 +0200
commit301c8b1d7c2373f85ed5d944a8e9264dad36064c (patch)
tree040ae2bf2a1d473e7019113fc1a8773fa59e0d40 /kernel
parentMerge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi (diff)
parentlocking/atomic: sparc: Fix arch_cmpxchg64_local() (diff)
downloadlinux-301c8b1d7c2373f85ed5d944a8e9264dad36064c.tar.xz
linux-301c8b1d7c2373f85ed5d944a8e9264dad36064c.zip
Merge tag 'locking-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Ingo Molnar: - Fix a Sparc crash - Fix a number of objtool warnings - Fix /proc/lockdep output on certain configs - Restore a kprobes fail-safe * tag 'locking-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/atomic: sparc: Fix arch_cmpxchg64_local() kprobe/static_call: Restore missing static_call_text_reserved() static_call: Fix static_call_text_reserved() vs __init jump_label: Fix jump_label_text_reserved() vs __init locking/lockdep: Fix meaningless /proc/lockdep output of lock classes on !CONFIG_PROVE_LOCKING
Diffstat (limited to 'kernel')
-rw-r--r--kernel/jump_label.c13
-rw-r--r--kernel/kprobes.c2
-rw-r--r--kernel/locking/lockdep_proc.c26
-rw-r--r--kernel/static_call.c13
4 files changed, 32 insertions, 22 deletions
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index bdb0681bece8..b156e152d6b4 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -316,14 +316,16 @@ static int addr_conflict(struct jump_entry *entry, void *start, void *end)
}
static int __jump_label_text_reserved(struct jump_entry *iter_start,
- struct jump_entry *iter_stop, void *start, void *end)
+ struct jump_entry *iter_stop, void *start, void *end, bool init)
{
struct jump_entry *iter;
iter = iter_start;
while (iter < iter_stop) {
- if (addr_conflict(iter, start, end))
- return 1;
+ if (init || !jump_entry_is_init(iter)) {
+ if (addr_conflict(iter, start, end))
+ return 1;
+ }
iter++;
}
@@ -562,7 +564,7 @@ static int __jump_label_mod_text_reserved(void *start, void *end)
ret = __jump_label_text_reserved(mod->jump_entries,
mod->jump_entries + mod->num_jump_entries,
- start, end);
+ start, end, mod->state == MODULE_STATE_COMING);
module_put(mod);
@@ -788,8 +790,9 @@ early_initcall(jump_label_init_module);
*/
int jump_label_text_reserved(void *start, void *end)
{
+ bool init = system_state < SYSTEM_RUNNING;
int ret = __jump_label_text_reserved(__start___jump_table,
- __stop___jump_table, start, end);
+ __stop___jump_table, start, end, init);
if (ret)
return ret;
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 471b1d18a92f..790a573bbe00 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -35,6 +35,7 @@
#include <linux/ftrace.h>
#include <linux/cpu.h>
#include <linux/jump_label.h>
+#include <linux/static_call.h>
#include <linux/perf_event.h>
#include <asm/sections.h>
@@ -1561,6 +1562,7 @@ static int check_kprobe_address_safe(struct kprobe *p,
if (!kernel_text_address((unsigned long) p->addr) ||
within_kprobe_blacklist((unsigned long) p->addr) ||
jump_label_text_reserved(p->addr, p->addr) ||
+ static_call_text_reserved(p->addr, p->addr) ||
find_bug((unsigned long)p->addr)) {
ret = -EINVAL;
goto out;
diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c
index 806978314496..b8d9a050c337 100644
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -70,26 +70,28 @@ static int l_show(struct seq_file *m, void *v)
#ifdef CONFIG_DEBUG_LOCKDEP
seq_printf(m, " OPS:%8ld", debug_class_ops_read(class));
#endif
-#ifdef CONFIG_PROVE_LOCKING
- seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
- seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
-#endif
+ if (IS_ENABLED(CONFIG_PROVE_LOCKING)) {
+ seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
+ seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
- get_usage_chars(class, usage);
- seq_printf(m, " %s", usage);
+ get_usage_chars(class, usage);
+ seq_printf(m, " %s", usage);
+ }
seq_printf(m, ": ");
print_name(m, class);
seq_puts(m, "\n");
- list_for_each_entry(entry, &class->locks_after, entry) {
- if (entry->distance == 1) {
- seq_printf(m, " -> [%p] ", entry->class->key);
- print_name(m, entry->class);
- seq_puts(m, "\n");
+ if (IS_ENABLED(CONFIG_PROVE_LOCKING)) {
+ list_for_each_entry(entry, &class->locks_after, entry) {
+ if (entry->distance == 1) {
+ seq_printf(m, " -> [%p] ", entry->class->key);
+ print_name(m, entry->class);
+ seq_puts(m, "\n");
+ }
}
+ seq_puts(m, "\n");
}
- seq_puts(m, "\n");
return 0;
}
diff --git a/kernel/static_call.c b/kernel/static_call.c
index 723fcc9d20db..43ba0b1e0edb 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -292,13 +292,15 @@ static int addr_conflict(struct static_call_site *site, void *start, void *end)
static int __static_call_text_reserved(struct static_call_site *iter_start,
struct static_call_site *iter_stop,
- void *start, void *end)
+ void *start, void *end, bool init)
{
struct static_call_site *iter = iter_start;
while (iter < iter_stop) {
- if (addr_conflict(iter, start, end))
- return 1;
+ if (init || !static_call_is_init(iter)) {
+ if (addr_conflict(iter, start, end))
+ return 1;
+ }
iter++;
}
@@ -324,7 +326,7 @@ static int __static_call_mod_text_reserved(void *start, void *end)
ret = __static_call_text_reserved(mod->static_call_sites,
mod->static_call_sites + mod->num_static_call_sites,
- start, end);
+ start, end, mod->state == MODULE_STATE_COMING);
module_put(mod);
@@ -459,8 +461,9 @@ static inline int __static_call_mod_text_reserved(void *start, void *end)
int static_call_text_reserved(void *start, void *end)
{
+ bool init = system_state < SYSTEM_RUNNING;
int ret = __static_call_text_reserved(__start_static_call_sites,
- __stop_static_call_sites, start, end);
+ __stop_static_call_sites, start, end, init);
if (ret)
return ret;