diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kprobes.c | 9 | ||||
| -rw-r--r-- | kernel/locking/lockdep.c | 35 | ||||
| -rw-r--r-- | kernel/locking/lockdep_internals.h | 2 | ||||
| -rw-r--r-- | kernel/locking/percpu-rwsem.c | 4 | ||||
| -rw-r--r-- | kernel/stackleak.c | 2 | ||||
| -rw-r--r-- | kernel/sysctl.c | 8 | ||||
| -rw-r--r-- | kernel/trace/ftrace.c | 3 | ||||
| -rw-r--r-- | kernel/trace/trace_preemptirq.c | 4 |
8 files changed, 53 insertions, 14 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 287b263c9cb9..049da84e1952 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2140,6 +2140,9 @@ static void kill_kprobe(struct kprobe *p) lockdep_assert_held(&kprobe_mutex); + if (WARN_ON_ONCE(kprobe_gone(p))) + return; + p->flags |= KPROBE_FLAG_GONE; if (kprobe_aggrprobe(p)) { /* @@ -2419,7 +2422,10 @@ static int kprobes_module_callback(struct notifier_block *nb, mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; - hlist_for_each_entry(p, head, hlist) + hlist_for_each_entry(p, head, hlist) { + if (kprobe_gone(p)) + continue; + if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { @@ -2436,6 +2442,7 @@ static int kprobes_module_callback(struct notifier_block *nb, */ kill_kprobe(p); } + } } if (val == MODULE_STATE_GOING) remove_module_kprobe_blacklist(mod); diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 54b74fabf40c..2facbbd146ec 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -3969,13 +3969,18 @@ static int separate_irq_context(struct task_struct *curr, static int mark_lock(struct task_struct *curr, struct held_lock *this, enum lock_usage_bit new_bit) { - unsigned int new_mask = 1 << new_bit, ret = 1; + unsigned int old_mask, new_mask, ret = 1; if (new_bit >= LOCK_USAGE_STATES) { DEBUG_LOCKS_WARN_ON(1); return 0; } + if (new_bit == LOCK_USED && this->read) + new_bit = LOCK_USED_READ; + + new_mask = 1 << new_bit; + /* * If already set then do not dirty the cacheline, * nor do any checks: @@ -3988,13 +3993,22 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this, /* * Make sure we didn't race: */ - if (unlikely(hlock_class(this)->usage_mask & new_mask)) { - graph_unlock(); - return 1; - } + if (unlikely(hlock_class(this)->usage_mask & new_mask)) + goto unlock; + old_mask = hlock_class(this)->usage_mask; hlock_class(this)->usage_mask |= new_mask; + /* + * Save one usage_traces[] entry and map both LOCK_USED and + * LOCK_USED_READ onto the same entry. + */ + if (new_bit == LOCK_USED || new_bit == LOCK_USED_READ) { + if (old_mask & (LOCKF_USED | LOCKF_USED_READ)) + goto unlock; + new_bit = LOCK_USED; + } + if (!(hlock_class(this)->usage_traces[new_bit] = save_trace())) return 0; @@ -4008,6 +4022,7 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this, return 0; } +unlock: graph_unlock(); /* @@ -4942,12 +4957,20 @@ static void verify_lock_unused(struct lockdep_map *lock, struct held_lock *hlock { #ifdef CONFIG_PROVE_LOCKING struct lock_class *class = look_up_lock_class(lock, subclass); + unsigned long mask = LOCKF_USED; /* if it doesn't have a class (yet), it certainly hasn't been used yet */ if (!class) return; - if (!(class->usage_mask & LOCK_USED)) + /* + * READ locks only conflict with USED, such that if we only ever use + * READ locks, there is no deadlock possible -- RCU. + */ + if (!hlock->read) + mask |= LOCKF_USED_READ; + + if (!(class->usage_mask & mask)) return; hlock->class_idx = class - lock_classes; diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h index baca699b94e9..b0be1560ed17 100644 --- a/kernel/locking/lockdep_internals.h +++ b/kernel/locking/lockdep_internals.h @@ -19,6 +19,7 @@ enum lock_usage_bit { #include "lockdep_states.h" #undef LOCKDEP_STATE LOCK_USED, + LOCK_USED_READ, LOCK_USAGE_STATES }; @@ -40,6 +41,7 @@ enum { #include "lockdep_states.h" #undef LOCKDEP_STATE __LOCKF(USED) + __LOCKF(USED_READ) }; #define LOCKDEP_STATE(__STATE) LOCKF_ENABLED_##__STATE | diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c index 8bbafe3e5203..70a32a576f3f 100644 --- a/kernel/locking/percpu-rwsem.c +++ b/kernel/locking/percpu-rwsem.c @@ -45,7 +45,7 @@ EXPORT_SYMBOL_GPL(percpu_free_rwsem); static bool __percpu_down_read_trylock(struct percpu_rw_semaphore *sem) { - __this_cpu_inc(*sem->read_count); + this_cpu_inc(*sem->read_count); /* * Due to having preemption disabled the decrement happens on @@ -71,7 +71,7 @@ static bool __percpu_down_read_trylock(struct percpu_rw_semaphore *sem) if (likely(!atomic_read_acquire(&sem->block))) return true; - __this_cpu_dec(*sem->read_count); + this_cpu_dec(*sem->read_count); /* Prod writer to re-evaluate readers_active_check() */ rcuwait_wake_up(&sem->writer); diff --git a/kernel/stackleak.c b/kernel/stackleak.c index a8fc9ae1d03d..ce161a8e8d97 100644 --- a/kernel/stackleak.c +++ b/kernel/stackleak.c @@ -20,7 +20,7 @@ static DEFINE_STATIC_KEY_FALSE(stack_erasing_bypass); int stack_erasing_sysctl(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { int ret = 0; int state = !static_branch_unlikely(&stack_erasing_bypass); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 09e70ee2332e..afad085960b8 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2912,6 +2912,14 @@ static struct ctl_table vm_table[] = { .proc_handler = percpu_pagelist_fraction_sysctl_handler, .extra1 = SYSCTL_ZERO, }, + { + .procname = "page_lock_unfairness", + .data = &sysctl_page_lock_unfairness, + .maxlen = sizeof(sysctl_page_lock_unfairness), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + }, #ifdef CONFIG_MMU { .procname = "max_map_count", diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 275441254bb5..e9fa580f3083 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -7531,8 +7531,7 @@ static bool is_permanent_ops_registered(void) int ftrace_enable_sysctl(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, - loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { int ret = -ENODEV; diff --git a/kernel/trace/trace_preemptirq.c b/kernel/trace/trace_preemptirq.c index f10073e62603..f4938040c228 100644 --- a/kernel/trace/trace_preemptirq.c +++ b/kernel/trace/trace_preemptirq.c @@ -102,14 +102,14 @@ NOKPROBE_SYMBOL(trace_hardirqs_on_caller); __visible void trace_hardirqs_off_caller(unsigned long caller_addr) { + lockdep_hardirqs_off(CALLER_ADDR0); + if (!this_cpu_read(tracing_irq_cpu)) { this_cpu_write(tracing_irq_cpu, 1); tracer_hardirqs_off(CALLER_ADDR0, caller_addr); if (!in_nmi()) trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr); } - - lockdep_hardirqs_off(CALLER_ADDR0); } EXPORT_SYMBOL(trace_hardirqs_off_caller); NOKPROBE_SYMBOL(trace_hardirqs_off_caller); |