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-rw-r--r--kernel/bpf/btf.c24
-rw-r--r--kernel/bpf/cpumask.c20
-rw-r--r--kernel/bpf/hashtab.c22
-rw-r--r--kernel/bpf/map_iter.c39
-rw-r--r--kernel/bpf/memalloc.c378
-rw-r--r--kernel/bpf/preload/iterators/Makefile2
-rw-r--r--kernel/bpf/preload/iterators/iterators.bpf.c9
-rw-r--r--kernel/bpf/preload/iterators/iterators.lskel-little-endian.h526
-rw-r--r--kernel/bpf/ringbuf.c26
-rw-r--r--kernel/bpf/syscall.c180
-rw-r--r--kernel/bpf/verifier.c42
-rw-r--r--kernel/rcu/rcu.h2
-rw-r--r--kernel/trace/bpf_trace.c49
-rw-r--r--kernel/trace/trace_kprobe.c13
-rw-r--r--kernel/trace/trace_uprobe.c3
15 files changed, 897 insertions, 438 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 817204d53372..ef9581a580e2 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6133,8 +6133,9 @@ static int btf_struct_walk(struct bpf_verifier_log *log, const struct btf *btf,
const char *tname, *mname, *tag_value;
u32 vlen, elem_id, mid;
- *flag = 0;
again:
+ if (btf_type_is_modifier(t))
+ t = btf_type_skip_modifiers(btf, t->type, NULL);
tname = __btf_name_by_offset(btf, t->name_off);
if (!btf_type_is_struct(t)) {
bpf_log(log, "Type '%s' is not a struct\n", tname);
@@ -6142,6 +6143,14 @@ again:
}
vlen = btf_type_vlen(t);
+ if (BTF_INFO_KIND(t->info) == BTF_KIND_UNION && vlen != 1 && !(*flag & PTR_UNTRUSTED))
+ /*
+ * walking unions yields untrusted pointers
+ * with exception of __bpf_md_ptr and other
+ * unions with a single member
+ */
+ *flag |= PTR_UNTRUSTED;
+
if (off + size > t->size) {
/* If the last element is a variable size array, we may
* need to relax the rule.
@@ -6302,15 +6311,6 @@ error:
* of this field or inside of this struct
*/
if (btf_type_is_struct(mtype)) {
- if (BTF_INFO_KIND(mtype->info) == BTF_KIND_UNION &&
- btf_type_vlen(mtype) != 1)
- /*
- * walking unions yields untrusted pointers
- * with exception of __bpf_md_ptr and other
- * unions with a single member
- */
- *flag |= PTR_UNTRUSTED;
-
/* our field must be inside that union or struct */
t = mtype;
@@ -6368,7 +6368,7 @@ error:
* that also allows using an array of int as a scratch
* space. e.g. skb->cb[].
*/
- if (off + size > mtrue_end) {
+ if (off + size > mtrue_end && !(*flag & PTR_UNTRUSTED)) {
bpf_log(log,
"access beyond the end of member %s (mend:%u) in struct %s with off %u size %u\n",
mname, mtrue_end, tname, off, size);
@@ -6476,7 +6476,7 @@ bool btf_struct_ids_match(struct bpf_verifier_log *log,
bool strict)
{
const struct btf_type *type;
- enum bpf_type_flag flag;
+ enum bpf_type_flag flag = 0;
int err;
/* Are we already done? */
diff --git a/kernel/bpf/cpumask.c b/kernel/bpf/cpumask.c
index 938a60ff4295..6983af8e093c 100644
--- a/kernel/bpf/cpumask.c
+++ b/kernel/bpf/cpumask.c
@@ -9,7 +9,6 @@
/**
* struct bpf_cpumask - refcounted BPF cpumask wrapper structure
* @cpumask: The actual cpumask embedded in the struct.
- * @rcu: The RCU head used to free the cpumask with RCU safety.
* @usage: Object reference counter. When the refcount goes to 0, the
* memory is released back to the BPF allocator, which provides
* RCU safety.
@@ -25,7 +24,6 @@
*/
struct bpf_cpumask {
cpumask_t cpumask;
- struct rcu_head rcu;
refcount_t usage;
};
@@ -82,16 +80,6 @@ __bpf_kfunc struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask)
return cpumask;
}
-static void cpumask_free_cb(struct rcu_head *head)
-{
- struct bpf_cpumask *cpumask;
-
- cpumask = container_of(head, struct bpf_cpumask, rcu);
- migrate_disable();
- bpf_mem_cache_free(&bpf_cpumask_ma, cpumask);
- migrate_enable();
-}
-
/**
* bpf_cpumask_release() - Release a previously acquired BPF cpumask.
* @cpumask: The cpumask being released.
@@ -102,8 +90,12 @@ static void cpumask_free_cb(struct rcu_head *head)
*/
__bpf_kfunc void bpf_cpumask_release(struct bpf_cpumask *cpumask)
{
- if (refcount_dec_and_test(&cpumask->usage))
- call_rcu(&cpumask->rcu, cpumask_free_cb);
+ if (!refcount_dec_and_test(&cpumask->usage))
+ return;
+
+ migrate_disable();
+ bpf_mem_cache_free_rcu(&bpf_cpumask_ma, cpumask);
+ migrate_enable();
}
/**
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 56d3da7d0bc6..a8c7e1c5abfa 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -302,6 +302,7 @@ static struct htab_elem *prealloc_lru_pop(struct bpf_htab *htab, void *key,
struct htab_elem *l;
if (node) {
+ bpf_map_inc_elem_count(&htab->map);
l = container_of(node, struct htab_elem, lru_node);
memcpy(l->key, key, htab->map.key_size);
return l;
@@ -510,12 +511,16 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
htab->n_buckets > U32_MAX / sizeof(struct bucket))
goto free_htab;
+ err = bpf_map_init_elem_count(&htab->map);
+ if (err)
+ goto free_htab;
+
err = -ENOMEM;
htab->buckets = bpf_map_area_alloc(htab->n_buckets *
sizeof(struct bucket),
htab->map.numa_node);
if (!htab->buckets)
- goto free_htab;
+ goto free_elem_count;
for (i = 0; i < HASHTAB_MAP_LOCK_COUNT; i++) {
htab->map_locked[i] = bpf_map_alloc_percpu(&htab->map,
@@ -593,6 +598,8 @@ free_map_locked:
bpf_map_area_free(htab->buckets);
bpf_mem_alloc_destroy(&htab->pcpu_ma);
bpf_mem_alloc_destroy(&htab->ma);
+free_elem_count:
+ bpf_map_free_elem_count(&htab->map);
free_htab:
lockdep_unregister_key(&htab->lockdep_key);
bpf_map_area_free(htab);
@@ -804,6 +811,7 @@ static bool htab_lru_map_delete_node(void *arg, struct bpf_lru_node *node)
if (l == tgt_l) {
hlist_nulls_del_rcu(&l->hash_node);
check_and_free_fields(htab, l);
+ bpf_map_dec_elem_count(&htab->map);
break;
}
@@ -900,6 +908,8 @@ static bool is_map_full(struct bpf_htab *htab)
static void inc_elem_count(struct bpf_htab *htab)
{
+ bpf_map_inc_elem_count(&htab->map);
+
if (htab->use_percpu_counter)
percpu_counter_add_batch(&htab->pcount, 1, PERCPU_COUNTER_BATCH);
else
@@ -908,6 +918,8 @@ static void inc_elem_count(struct bpf_htab *htab)
static void dec_elem_count(struct bpf_htab *htab)
{
+ bpf_map_dec_elem_count(&htab->map);
+
if (htab->use_percpu_counter)
percpu_counter_add_batch(&htab->pcount, -1, PERCPU_COUNTER_BATCH);
else
@@ -920,6 +932,7 @@ static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l)
htab_put_fd_value(htab, l);
if (htab_is_prealloc(htab)) {
+ bpf_map_dec_elem_count(&htab->map);
check_and_free_fields(htab, l);
__pcpu_freelist_push(&htab->freelist, &l->fnode);
} else {
@@ -1000,6 +1013,7 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
if (!l)
return ERR_PTR(-E2BIG);
l_new = container_of(l, struct htab_elem, fnode);
+ bpf_map_inc_elem_count(&htab->map);
}
} else {
if (is_map_full(htab))
@@ -1168,6 +1182,7 @@ err:
static void htab_lru_push_free(struct bpf_htab *htab, struct htab_elem *elem)
{
check_and_free_fields(htab, elem);
+ bpf_map_dec_elem_count(&htab->map);
bpf_lru_push_free(&htab->lru, &elem->lru_node);
}
@@ -1357,8 +1372,10 @@ static long __htab_lru_percpu_map_update_elem(struct bpf_map *map, void *key,
err:
htab_unlock_bucket(htab, b, hash, flags);
err_lock_bucket:
- if (l_new)
+ if (l_new) {
+ bpf_map_dec_elem_count(&htab->map);
bpf_lru_push_free(&htab->lru, &l_new->lru_node);
+ }
return ret;
}
@@ -1523,6 +1540,7 @@ static void htab_map_free(struct bpf_map *map)
prealloc_destroy(htab);
}
+ bpf_map_free_elem_count(map);
free_percpu(htab->extra_elems);
bpf_map_area_free(htab->buckets);
bpf_mem_alloc_destroy(&htab->pcpu_ma);
diff --git a/kernel/bpf/map_iter.c b/kernel/bpf/map_iter.c
index b0fa190b0979..d06d3b7150e5 100644
--- a/kernel/bpf/map_iter.c
+++ b/kernel/bpf/map_iter.c
@@ -93,7 +93,7 @@ static struct bpf_iter_reg bpf_map_reg_info = {
.ctx_arg_info_size = 1,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__bpf_map, map),
- PTR_TO_BTF_ID_OR_NULL },
+ PTR_TO_BTF_ID_OR_NULL | PTR_TRUSTED },
},
.seq_info = &bpf_map_seq_info,
};
@@ -193,3 +193,40 @@ static int __init bpf_map_iter_init(void)
}
late_initcall(bpf_map_iter_init);
+
+__diag_push();
+__diag_ignore_all("-Wmissing-prototypes",
+ "Global functions as their definitions will be in vmlinux BTF");
+
+__bpf_kfunc s64 bpf_map_sum_elem_count(struct bpf_map *map)
+{
+ s64 *pcount;
+ s64 ret = 0;
+ int cpu;
+
+ if (!map || !map->elem_count)
+ return 0;
+
+ for_each_possible_cpu(cpu) {
+ pcount = per_cpu_ptr(map->elem_count, cpu);
+ ret += READ_ONCE(*pcount);
+ }
+ return ret;
+}
+
+__diag_pop();
+
+BTF_SET8_START(bpf_map_iter_kfunc_ids)
+BTF_ID_FLAGS(func, bpf_map_sum_elem_count, KF_TRUSTED_ARGS)
+BTF_SET8_END(bpf_map_iter_kfunc_ids)
+
+static const struct btf_kfunc_id_set bpf_map_iter_kfunc_set = {
+ .owner = THIS_MODULE,
+ .set = &bpf_map_iter_kfunc_ids,
+};
+
+static int init_subsystem(void)
+{
+ return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_map_iter_kfunc_set);
+}
+late_initcall(init_subsystem);
diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c
index 0668bcd7c926..51d6389e5152 100644
--- a/kernel/bpf/memalloc.c
+++ b/kernel/bpf/memalloc.c
@@ -98,11 +98,23 @@ struct bpf_mem_cache {
int free_cnt;
int low_watermark, high_watermark, batch;
int percpu_size;
+ bool draining;
+ struct bpf_mem_cache *tgt;
- struct rcu_head rcu;
+ /* list of objects to be freed after RCU GP */
struct llist_head free_by_rcu;
+ struct llist_node *free_by_rcu_tail;
struct llist_head waiting_for_gp;
+ struct llist_node *waiting_for_gp_tail;
+ struct rcu_head rcu;
atomic_t call_rcu_in_progress;
+ struct llist_head free_llist_extra_rcu;
+
+ /* list of objects to be freed after RCU tasks trace GP */
+ struct llist_head free_by_rcu_ttrace;
+ struct llist_head waiting_for_gp_ttrace;
+ struct rcu_head rcu_ttrace;
+ atomic_t call_rcu_ttrace_in_progress;
};
struct bpf_mem_caches {
@@ -153,59 +165,83 @@ static struct mem_cgroup *get_memcg(const struct bpf_mem_cache *c)
#endif
}
+static void inc_active(struct bpf_mem_cache *c, unsigned long *flags)
+{
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ /* In RT irq_work runs in per-cpu kthread, so disable
+ * interrupts to avoid preemption and interrupts and
+ * reduce the chance of bpf prog executing on this cpu
+ * when active counter is busy.
+ */
+ local_irq_save(*flags);
+ /* alloc_bulk runs from irq_work which will not preempt a bpf
+ * program that does unit_alloc/unit_free since IRQs are
+ * disabled there. There is no race to increment 'active'
+ * counter. It protects free_llist from corruption in case NMI
+ * bpf prog preempted this loop.
+ */
+ WARN_ON_ONCE(local_inc_return(&c->active) != 1);
+}
+
+static void dec_active(struct bpf_mem_cache *c, unsigned long flags)
+{
+ local_dec(&c->active);
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ local_irq_restore(flags);
+}
+
+static void add_obj_to_free_list(struct bpf_mem_cache *c, void *obj)
+{
+ unsigned long flags;
+
+ inc_active(c, &flags);
+ __llist_add(obj, &c->free_llist);
+ c->free_cnt++;
+ dec_active(c, flags);
+}
+
/* Mostly runs from irq_work except __init phase. */
static void alloc_bulk(struct bpf_mem_cache *c, int cnt, int node)
{
struct mem_cgroup *memcg = NULL, *old_memcg;
- unsigned long flags;
void *obj;
int i;
- memcg = get_memcg(c);
- old_memcg = set_active_memcg(memcg);
for (i = 0; i < cnt; i++) {
/*
- * free_by_rcu is only manipulated by irq work refill_work().
- * IRQ works on the same CPU are called sequentially, so it is
- * safe to use __llist_del_first() here. If alloc_bulk() is
- * invoked by the initial prefill, there will be no running
- * refill_work(), so __llist_del_first() is fine as well.
- *
- * In most cases, objects on free_by_rcu are from the same CPU.
- * If some objects come from other CPUs, it doesn't incur any
- * harm because NUMA_NO_NODE means the preference for current
- * numa node and it is not a guarantee.
+ * For every 'c' llist_del_first(&c->free_by_rcu_ttrace); is
+ * done only by one CPU == current CPU. Other CPUs might
+ * llist_add() and llist_del_all() in parallel.
*/
- obj = __llist_del_first(&c->free_by_rcu);
- if (!obj) {
- /* Allocate, but don't deplete atomic reserves that typical
- * GFP_ATOMIC would do. irq_work runs on this cpu and kmalloc
- * will allocate from the current numa node which is what we
- * want here.
- */
- obj = __alloc(c, node, GFP_NOWAIT | __GFP_NOWARN | __GFP_ACCOUNT);
- if (!obj)
- break;
- }
- if (IS_ENABLED(CONFIG_PREEMPT_RT))
- /* In RT irq_work runs in per-cpu kthread, so disable
- * interrupts to avoid preemption and interrupts and
- * reduce the chance of bpf prog executing on this cpu
- * when active counter is busy.
- */
- local_irq_save(flags);
- /* alloc_bulk runs from irq_work which will not preempt a bpf
- * program that does unit_alloc/unit_free since IRQs are
- * disabled there. There is no race to increment 'active'
- * counter. It protects free_llist from corruption in case NMI
- * bpf prog preempted this loop.
+ obj = llist_del_first(&c->free_by_rcu_ttrace);
+ if (!obj)
+ break;
+ add_obj_to_free_list(c, obj);
+ }
+ if (i >= cnt)
+ return;
+
+ for (; i < cnt; i++) {
+ obj = llist_del_first(&c->waiting_for_gp_ttrace);
+ if (!obj)
+ break;
+ add_obj_to_free_list(c, obj);
+ }
+ if (i >= cnt)
+ return;
+
+ memcg = get_memcg(c);
+ old_memcg = set_active_memcg(memcg);
+ for (; i < cnt; i++) {
+ /* Allocate, but don't deplete atomic reserves that typical
+ * GFP_ATOMIC would do. irq_work runs on this cpu and kmalloc
+ * will allocate from the current numa node which is what we
+ * want here.
*/
- WARN_ON_ONCE(local_inc_return(&c->active) != 1);
- __llist_add(obj, &c->free_llist);
- c->free_cnt++;
- local_dec(&c->active);
- if (IS_ENABLED(CONFIG_PREEMPT_RT))
- local_irq_restore(flags);
+ obj = __alloc(c, node, GFP_NOWAIT | __GFP_NOWARN | __GFP_ACCOUNT);
+ if (!obj)
+ break;
+ add_obj_to_free_list(c, obj);
}
set_active_memcg(old_memcg);
mem_cgroup_put(memcg);
@@ -222,20 +258,24 @@ static void free_one(void *obj, bool percpu)
kfree(obj);
}
-static void free_all(struct llist_node *llnode, bool percpu)
+static int free_all(struct llist_node *llnode, bool percpu)
{
struct llist_node *pos, *t;
+ int cnt = 0;
- llist_for_each_safe(pos, t, llnode)
+ llist_for_each_safe(pos, t, llnode) {
free_one(pos, percpu);
+ cnt++;
+ }
+ return cnt;
}
static void __free_rcu(struct rcu_head *head)
{
- struct bpf_mem_cache *c = container_of(head, struct bpf_mem_cache, rcu);
+ struct bpf_mem_cache *c = container_of(head, struct bpf_mem_cache, rcu_ttrace);
- free_all(llist_del_all(&c->waiting_for_gp), !!c->percpu_size);
- atomic_set(&c->call_rcu_in_progress, 0);
+ free_all(llist_del_all(&c->waiting_for_gp_ttrace), !!c->percpu_size);
+ atomic_set(&c->call_rcu_ttrace_in_progress, 0);
}
static void __free_rcu_tasks_trace(struct rcu_head *head)
@@ -254,60 +294,128 @@ static void enque_to_free(struct bpf_mem_cache *c, void *obj)
struct llist_node *llnode = obj;
/* bpf_mem_cache is a per-cpu object. Freeing happens in irq_work.
- * Nothing races to add to free_by_rcu list.
+ * Nothing races to add to free_by_rcu_ttrace list.
*/
- __llist_add(llnode, &c->free_by_rcu);
+ llist_add(llnode, &c->free_by_rcu_ttrace);
}
-static void do_call_rcu(struct bpf_mem_cache *c)
+static void do_call_rcu_ttrace(struct bpf_mem_cache *c)
{
struct llist_node *llnode, *t;
- if (atomic_xchg(&c->call_rcu_in_progress, 1))
+ if (atomic_xchg(&c->call_rcu_ttrace_in_progress, 1)) {
+ if (unlikely(READ_ONCE(c->draining))) {
+ llnode = llist_del_all(&c->free_by_rcu_ttrace);
+ free_all(llnode, !!c->percpu_size);
+ }
return;
+ }
+
+ WARN_ON_ONCE(!llist_empty(&c->waiting_for_gp_ttrace));
+ llist_for_each_safe(llnode, t, llist_del_all(&c->free_by_rcu_ttrace))
+ llist_add(llnode, &c->waiting_for_gp_ttrace);
+
+ if (unlikely(READ_ONCE(c->draining))) {
+ __free_rcu(&c->rcu_ttrace);
+ return;
+ }
- WARN_ON_ONCE(!llist_empty(&c->waiting_for_gp));
- llist_for_each_safe(llnode, t, __llist_del_all(&c->free_by_rcu))
- /* There is no concurrent __llist_add(waiting_for_gp) access.
- * It doesn't race with llist_del_all either.
- * But there could be two concurrent llist_del_all(waiting_for_gp):
- * from __free_rcu() and from drain_mem_cache().
- */
- __llist_add(llnode, &c->waiting_for_gp);
/* Use call_rcu_tasks_trace() to wait for sleepable progs to finish.
* If RCU Tasks Trace grace period implies RCU grace period, free
* these elements directly, else use call_rcu() to wait for normal
* progs to finish and finally do free_one() on each element.
*/
- call_rcu_tasks_trace(&c->rcu, __free_rcu_tasks_trace);
+ call_rcu_tasks_trace(&c->rcu_ttrace, __free_rcu_tasks_trace);
}
static void free_bulk(struct bpf_mem_cache *c)
{
+ struct bpf_mem_cache *tgt = c->tgt;
struct llist_node *llnode, *t;
unsigned long flags;
int cnt;
+ WARN_ON_ONCE(tgt->unit_size != c->unit_size);
+
do {
- if (IS_ENABLED(CONFIG_PREEMPT_RT))
- local_irq_save(flags);
- WARN_ON_ONCE(local_inc_return(&c->active) != 1);
+ inc_active(c, &flags);
llnode = __llist_del_first(&c->free_llist);
if (llnode)
cnt = --c->free_cnt;
else
cnt = 0;
- local_dec(&c->active);
- if (IS_ENABLED(CONFIG_PREEMPT_RT))
- local_irq_restore(flags);
+ dec_active(c, flags);
if (llnode)
- enque_to_free(c, llnode);
+ enque_to_free(tgt, llnode);
} while (cnt > (c->high_watermark + c->low_watermark) / 2);
/* and drain free_llist_extra */
llist_for_each_safe(llnode, t, llist_del_all(&c->free_llist_extra))
- enque_to_free(c, llnode);
- do_call_rcu(c);
+ enque_to_free(tgt, llnode);
+ do_call_rcu_ttrace(tgt);
+}
+
+static void __free_by_rcu(struct rcu_head *head)
+{
+ struct bpf_mem_cache *c = container_of(head, struct bpf_mem_cache, rcu);
+ struct bpf_mem_cache *tgt = c->tgt;
+ struct llist_node *llnode;
+
+ llnode = llist_del_all(&c->waiting_for_gp);
+ if (!llnode)
+ goto out;
+
+ llist_add_batch(llnode, c->waiting_for_gp_tail, &tgt->free_by_rcu_ttrace);
+
+ /* Objects went through regular RCU GP. Send them to RCU tasks trace */
+ do_call_rcu_ttrace(tgt);
+out:
+ atomic_set(&c->call_rcu_in_progress, 0);
+}
+
+static void check_free_by_rcu(struct bpf_mem_cache *c)
+{
+ struct llist_node *llnode, *t;
+ unsigned long flags;
+
+ /* drain free_llist_extra_rcu */
+ if (unlikely(!llist_empty(&c->free_llist_extra_rcu))) {
+ inc_active(c, &flags);
+ llist_for_each_safe(llnode, t, llist_del_all(&c->free_llist_extra_rcu))
+ if (__llist_add(llnode, &c->free_by_rcu))
+ c->free_by_rcu_tail = llnode;
+ dec_active(c, flags);
+ }
+
+ if (llist_empty(&c->free_by_rcu))
+ return;
+
+ if (atomic_xchg(&c->call_rcu_in_progress, 1)) {
+ /*
+ * Instead of kmalloc-ing new rcu_head and triggering 10k
+ * call_rcu() to hit rcutree.qhimark and force RCU to notice
+ * the overload just ask RCU to hurry up. There could be many
+ * objects in free_by_rcu list.
+ * This hint reduces memory consumption for an artificial
+ * benchmark from 2 Gbyte to 150 Mbyte.
+ */
+ rcu_request_urgent_qs_task(current);
+ return;
+ }
+
+ WARN_ON_ONCE(!llist_empty(&c->waiting_for_gp));
+
+ inc_active(c, &flags);
+ WRITE_ONCE(c->waiting_for_gp.first, __llist_del_all(&c->free_by_rcu));
+ c->waiting_for_gp_tail = c->free_by_rcu_tail;
+ dec_active(c, flags);
+
+ if (unlikely(READ_ONCE(c->draining))) {
+ free_all(llist_del_all(&c->waiting_for_gp), !!c->percpu_size);
+ atomic_set(&c->call_rcu_in_progress, 0);
+ } else {
+ call_rcu_hurry(&c->rcu, __free_by_rcu);
+ }
}
static void bpf_mem_refill(struct irq_work *work)
@@ -324,6 +432,8 @@ static void bpf_mem_refill(struct irq_work *work)
alloc_bulk(c, c->batch, NUMA_NO_NODE);
else if (cnt > c->high_watermark)
free_bulk(c);
+
+ check_free_by_rcu(c);
}
static void notrace irq_work_raise(struct bpf_mem_cache *c)
@@ -406,6 +516,7 @@ int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu)
c->unit_size = unit_size;
c->objcg = objcg;
c->percpu_size = percpu_size;
+ c->tgt = c;
prefill_mem_cache(c, cpu);
}
ma->cache = pc;
@@ -428,6 +539,7 @@ int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu)
c = &cc->cache[i];
c->unit_size = sizes[i];
c->objcg = objcg;
+ c->tgt = c;
prefill_mem_cache(c, cpu);
}
}
@@ -441,19 +553,57 @@ static void drain_mem_cache(struct bpf_mem_cache *c)
/* No progs are using this bpf_mem_cache, but htab_map_free() called
* bpf_mem_cache_free() for all remaining elements and they can be in
- * free_by_rcu or in waiting_for_gp lists, so drain those lists now.
+ * free_by_rcu_ttrace or in waiting_for_gp_ttrace lists, so drain those lists now.
*
- * Except for waiting_for_gp list, there are no concurrent operations
+ * Except for waiting_for_gp_ttrace list, there are no concurrent operations
* on these lists, so it is safe to use __llist_del_all().
*/
- free_all(__llist_del_all(&c->free_by_rcu), percpu);
- free_all(llist_del_all(&c->waiting_for_gp), percpu);
+ free_all(llist_del_all(&c->free_by_rcu_ttrace), percpu);
+ free_all(llist_del_all(&c->waiting_for_gp_ttrace), percpu);
free_all(__llist_del_all(&c->free_llist), percpu);
free_all(__llist_del_all(&c->free_llist_extra), percpu);
+ free_all(__llist_del_all(&c->free_by_rcu), percpu);
+ free_all(__llist_del_all(&c->free_llist_extra_rcu), percpu);
+ free_all(llist_del_all(&c->waiting_for_gp), percpu);
+}
+
+static void check_mem_cache(struct bpf_mem_cache *c)
+{
+ WARN_ON_ONCE(!llist_empty(&c->free_by_rcu_ttrace));
+ WARN_ON_ONCE(!llist_empty(&c->waiting_for_gp_ttrace));
+ WARN_ON_ONCE(!llist_empty(&c->free_llist));
+ WARN_ON_ONCE(!llist_empty(&c->free_llist_extra));
+ WARN_ON_ONCE(!llist_empty(&c->free_by_rcu));
+ WARN_ON_ONCE(!llist_empty(&c->free_llist_extra_rcu));
+ WARN_ON_ONCE(!llist_empty(&c->waiting_for_gp));
+}
+
+static void check_leaked_objs(struct bpf_mem_alloc *ma)
+{
+ struct bpf_mem_caches *cc;
+ struct bpf_mem_cache *c;
+ int cpu, i;
+
+ if (ma->cache) {
+ for_each_possible_cpu(cpu) {
+ c = per_cpu_ptr(ma->cache, cpu);
+ check_mem_cache(c);
+ }
+ }
+ if (ma->caches) {
+ for_each_possible_cpu(cpu) {
+ cc = per_cpu_ptr(ma->caches, cpu);
+ for (i = 0; i < NUM_CACHES; i++) {
+ c = &cc->cache[i];
+ check_mem_cache(c);
+ }
+ }
+ }
}
static void free_mem_alloc_no_barrier(struct bpf_mem_alloc *ma)
{
+ check_leaked_objs(ma);
free_percpu(ma->cache);
free_percpu(ma->caches);
ma->cache = NULL;
@@ -462,8 +612,8 @@ static void free_mem_alloc_no_barrier(struct bpf_mem_alloc *ma)
static void free_mem_alloc(struct bpf_mem_alloc *ma)
{
- /* waiting_for_gp lists was drained, but __free_rcu might
- * still execute. Wait for it now before we freeing percpu caches.
+ /* waiting_for_gp[_ttrace] lists were drained, but RCU callbacks
+ * might still execute. Wait for them.
*
* rcu_barrier_tasks_trace() doesn't imply synchronize_rcu_tasks_trace(),
* but rcu_barrier_tasks_trace() and rcu_barrier() below are only used
@@ -472,7 +622,8 @@ static void free_mem_alloc(struct bpf_mem_alloc *ma)
* rcu_trace_implies_rcu_gp(), it will be OK to skip rcu_barrier() by
* using rcu_trace_implies_rcu_gp() as well.
*/
- rcu_barrier_tasks_trace();
+ rcu_barrier(); /* wait for __free_by_rcu */
+ rcu_barrier_tasks_trace(); /* wait for __free_rcu */
if (!rcu_trace_implies_rcu_gp())
rcu_barrier();
free_mem_alloc_no_barrier(ma);
@@ -498,7 +649,7 @@ static void destroy_mem_alloc(struct bpf_mem_alloc *ma, int rcu_in_progress)
return;
}
- copy = kmalloc(sizeof(*ma), GFP_KERNEL);
+ copy = kmemdup(ma, sizeof(*ma), GFP_KERNEL);
if (!copy) {
/* Slow path with inline barrier-s */
free_mem_alloc(ma);
@@ -506,10 +657,7 @@ static void destroy_mem_alloc(struct bpf_mem_alloc *ma, int rcu_in_progress)
}
/* Defer barriers into worker to let the rest of map memory to be freed */
- copy->cache = ma->cache;
- ma->cache = NULL;
- copy->caches = ma->caches;
- ma->caches = NULL;
+ memset(ma, 0, sizeof(*ma));
INIT_WORK(&copy->work, free_mem_alloc_deferred);
queue_work(system_unbound_wq, &copy->work);
}
@@ -524,17 +672,10 @@ void bpf_mem_alloc_destroy(struct bpf_mem_alloc *ma)
rcu_in_progress = 0;
for_each_possible_cpu(cpu) {
c = per_cpu_ptr(ma->cache, cpu);
- /*
- * refill_work may be unfinished for PREEMPT_RT kernel
- * in which irq work is invoked in a per-CPU RT thread.
- * It is also possible for kernel with
- * arch_irq_work_has_interrupt() being false and irq
- * work is invoked in timer interrupt. So waiting for
- * the completion of irq work to ease the handling of
- * concurrency.
- */
+ WRITE_ONCE(c->draining, true);
irq_work_sync(&c->refill_work);
drain_mem_cache(c);
+ rcu_in_progress += atomic_read(&c->call_rcu_ttrace_in_progress);
rcu_in_progress += atomic_read(&c->call_rcu_in_progress);
}
/* objcg is the same across cpus */
@@ -548,8 +689,10 @@ void bpf_mem_alloc_destroy(struct bpf_mem_alloc *ma)
cc = per_cpu_ptr(ma->caches, cpu);
for (i = 0; i < NUM_CACHES; i++) {
c = &cc->cache[i];
+ WRITE_ONCE(c->draining, true);
irq_work_sync(&c->refill_work);
drain_mem_cache(c);
+ rcu_in_progress += atomic_read(&c->call_rcu_ttrace_in_progress);
rcu_in_progress += atomic_read(&c->call_rcu_in_progress);
}
}
@@ -581,8 +724,10 @@ static void notrace *unit_alloc(struct bpf_mem_cache *c)
local_irq_save(flags);
if (local_inc_return(&c->active) == 1) {
llnode = __llist_del_first(&c->free_llist);
- if (llnode)
+ if (llnode) {
cnt = --c->free_cnt;
+ *(struct bpf_mem_cache **)llnode = c;
+ }
}
local_dec(&c->active);
local_irq_restore(flags);
@@ -606,6 +751,12 @@ static void notrace unit_free(struct bpf_mem_cache *c, void *ptr)
BUILD_BUG_ON(LLIST_NODE_SZ > 8);
+ /*
+ * Remember bpf_mem_cache that allocated this object.
+ * The hint is not accurate.
+ */
+ c->tgt = *(struct bpf_mem_cache **)llnode;
+
local_irq_save(flags);
if (local_inc_return(&c->active) == 1) {
__llist_add(llnode, &c->free_llist);
@@ -627,6 +778,27 @@ static void notrace unit_free(struct bpf_mem_cache *c, void *ptr)
irq_work_raise(c);
}
+static void notrace unit_free_rcu(struct bpf_mem_cache *c, void *ptr)
+{
+ struct llist_node *llnode = ptr - LLIST_NODE_SZ;
+ unsigned long flags;
+
+ c->tgt = *(struct bpf_mem_cache **)llnode;
+
+ local_irq_save(flags);
+ if (local_inc_return(&c->active) == 1) {
+ if (__llist_add(llnode, &c->free_by_rcu))
+ c->free_by_rcu_tail = llnode;
+ } else {
+ llist_add(llnode, &c->free_llist_extra_rcu);
+ }
+ local_dec(&c->active);
+ local_irq_restore(flags);
+
+ if (!atomic_read(&c->call_rcu_in_progress))
+ irq_work_raise(c);
+}
+
/* Called from BPF program or from sys_bpf syscall.
* In both cases migration is disabled.
*/
@@ -660,6 +832,20 @@ void notrace bpf_mem_free(struct bpf_mem_alloc *ma, void *ptr)
unit_free(this_cpu_ptr(ma->caches)->cache + idx, ptr);
}
+void notrace bpf_mem_free_rcu(struct bpf_mem_alloc *ma, void *ptr)
+{
+ int idx;
+
+ if (!ptr)
+ return;
+
+ idx = bpf_mem_cache_idx(ksize(ptr - LLIST_NODE_SZ));
+ if (idx < 0)
+ return;
+
+ unit_free_rcu(this_cpu_ptr(ma->caches)->cache + idx, ptr);
+}
+
void notrace *bpf_mem_cache_alloc(struct bpf_mem_alloc *ma)
{
void *ret;
@@ -676,6 +862,14 @@ void notrace bpf_mem_cache_free(struct bpf_mem_alloc *ma, void *ptr)
unit_free(this_cpu_ptr(ma->cache), ptr);
}
+void notrace bpf_mem_cache_free_rcu(struct bpf_mem_alloc *ma, void *ptr)
+{
+ if (!ptr)
+ return;
+
+ unit_free_rcu(this_cpu_ptr(ma->cache), ptr);
+}
+
/* Directly does a kfree() without putting 'ptr' back to the free_llist
* for reuse and without waiting for a rcu_tasks_trace gp.
* The caller must first go through the rcu_tasks_trace gp for 'ptr'
diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile
index 8937dc6bc8d0..b83c2f5e9be1 100644
--- a/kernel/bpf/preload/iterators/Makefile
+++ b/kernel/bpf/preload/iterators/Makefile
@@ -50,7 +50,7 @@ iterators.lskel-%.h: $(OUTPUT)/%/iterators.bpf.o | $(BPFTOOL)
$(OUTPUT)/%/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
$(call msg,BPF,$@)
$(Q)mkdir -p $(@D)
- $(Q)$(CLANG) -g -O2 -target bpf -m$* $(INCLUDES) \
+ $(Q)$(CLANG) -g -O2 --target=bpf -m$* $(INCLUDES) \
-c $(filter %.c,$^) -o $@ && \
$(LLVM_STRIP) -g $@
diff --git a/kernel/bpf/preload/iterators/iterators.bpf.c b/kernel/bpf/preload/iterators/iterators.bpf.c
index 03af863314ea..b78968b63fab 100644
--- a/kernel/bpf/preload/iterators/iterators.bpf.c
+++ b/kernel/bpf/preload/iterators/iterators.bpf.c
@@ -73,6 +73,8 @@ static const char *get_name(struct btf *btf, long btf_id, const char *fallback)
return str + name_off;
}
+__s64 bpf_map_sum_elem_count(struct bpf_map *map) __ksym;
+
SEC("iter/bpf_map")
int dump_bpf_map(struct bpf_iter__bpf_map *ctx)
{
@@ -84,9 +86,12 @@ int dump_bpf_map(struct bpf_iter__bpf_map *ctx)
return 0;
if (seq_num == 0)
- BPF_SEQ_PRINTF(seq, " id name max_entries\n");
+ BPF_SEQ_PRINTF(seq, " id name max_entries cur_entries\n");
+
+ BPF_SEQ_PRINTF(seq, "%4u %-16s %10d %10lld\n",
+ map->id, map->name, map->max_entries,
+ bpf_map_sum_elem_count(map));
- BPF_SEQ_PRINTF(seq, "%4u %-16s%6d\n", map->id, map->name, map->max_entries);
return 0;
}
diff --git a/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h
index 70f236a82fe1..5b98ab02025e 100644
--- a/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h
+++ b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h
@@ -1,5 +1,5 @@
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
-/* THIS FILE IS AUTOGENERATED! */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
#ifndef __ITERATORS_BPF_SKEL_H__
#define __ITERATORS_BPF_SKEL_H__
@@ -18,8 +18,6 @@ struct iterators_bpf {
int dump_bpf_map_fd;
int dump_bpf_prog_fd;
} links;
- struct iterators_bpf__rodata {
- } *rodata;
};
static inline int
@@ -68,7 +66,6 @@ iterators_bpf__destroy(struct iterators_bpf *skel)
iterators_bpf__detach(skel);
skel_closenz(skel->progs.dump_bpf_map.prog_fd);
skel_closenz(skel->progs.dump_bpf_prog.prog_fd);
- skel_free_map_data(skel->rodata, skel->maps.rodata.initial_value, 4096);
skel_closenz(skel->maps.rodata.map_fd);
skel_free(skel);
}
@@ -81,15 +78,6 @@ iterators_bpf__open(void)
if (!skel)
goto cleanup;
skel->ctx.sz = (void *)&skel->links - (void *)skel;
- skel->rodata = skel_prep_map_data((void *)"\
-\x20\x20\x69\x64\x20\x6e\x61\x6d\x65\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\
-\x20\x20\x20\x6d\x61\x78\x5f\x65\x6e\x74\x72\x69\x65\x73\x0a\0\x25\x34\x75\x20\
-\x25\x2d\x31\x36\x73\x25\x36\x64\x0a\0\x20\x20\x69\x64\x20\x6e\x61\x6d\x65\x20\
-\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x61\x74\x74\x61\x63\x68\x65\
-\x64\x0a\0\x25\x34\x75\x20\x25\x2d\x31\x36\x73\x20\x25\x73\x20\x25\x73\x0a\0", 4096, 98);
- if (!skel->rodata)
- goto cleanup;
- skel->maps.rodata.initial_value = (__u64) (long) skel->rodata;
return skel;
cleanup:
iterators_bpf__destroy(skel);
@@ -103,7 +91,7 @@ iterators_bpf__load(struct iterators_bpf *skel)
int err;
opts.ctx = (struct bpf_loader_ctx *)skel;
- opts.data_sz = 6056;
+ opts.data_sz = 6208;
opts.data = (void *)"\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
@@ -138,190 +126,197 @@ iterators_bpf__load(struct iterators_bpf *skel)
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x9f\xeb\x01\0\
-\x18\0\0\0\0\0\0\0\x1c\x04\0\0\x1c\x04\0\0\xf9\x04\0\0\0\0\0\0\0\0\0\x02\x02\0\
+\x18\0\0\0\0\0\0\0\x80\x04\0\0\x80\x04\0\0\x31\x05\0\0\0\0\0\0\0\0\0\x02\x02\0\
\0\0\x01\0\0\0\x02\0\0\x04\x10\0\0\0\x13\0\0\0\x03\0\0\0\0\0\0\0\x18\0\0\0\x04\
\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x08\0\0\0\0\0\0\0\0\0\0\x02\x0d\0\0\0\0\0\0\
\0\x01\0\0\x0d\x06\0\0\0\x1c\0\0\0\x01\0\0\0\x20\0\0\0\0\0\0\x01\x04\0\0\0\x20\
-\0\0\x01\x24\0\0\0\x01\0\0\x0c\x05\0\0\0\xa3\0\0\0\x03\0\0\x04\x18\0\0\0\xb1\0\
-\0\0\x09\0\0\0\0\0\0\0\xb5\0\0\0\x0b\0\0\0\x40\0\0\0\xc0\0\0\0\x0b\0\0\0\x80\0\
-\0\0\0\0\0\0\0\0\0\x02\x0a\0\0\0\xc8\0\0\0\0\0\0\x07\0\0\0\0\xd1\0\0\0\0\0\0\
-\x08\x0c\0\0\0\xd7\0\0\0\0\0\0\x01\x08\0\0\0\x40\0\0\0\x94\x01\0\0\x03\0\0\x04\
-\x18\0\0\0\x9c\x01\0\0\x0e\0\0\0\0\0\0\0\x9f\x01\0\0\x11\0\0\0\x20\0\0\0\xa4\
-\x01\0\0\x0e\0\0\0\xa0\0\0\0\xb0\x01\0\0\0\0\0\x08\x0f\0\0\0\xb6\x01\0\0\0\0\0\
-\x01\x04\0\0\0\x20\0\0\0\xc3\x01\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\x01\0\0\0\0\0\
-\0\0\x03\0\0\0\0\x10\0\0\0\x12\0\0\0\x10\0\0\0\xc8\x01\0\0\0\0\0\x01\x04\0\0\0\
-\x20\0\0\0\0\0\0\0\0\0\0\x02\x14\0\0\0\x2c\x02\0\0\x02\0\0\x04\x10\0\0\0\x13\0\
-\0\0\x03\0\0\0\0\0\0\0\x3f\x02\0\0\x15\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x18\0\
-\0\0\0\0\0\0\x01\0\0\x0d\x06\0\0\0\x1c\0\0\0\x13\0\0\0\x44\x02\0\0\x01\0\0\x0c\
-\x16\0\0\0\x90\x02\0\0\x01\0\0\x04\x08\0\0\0\x99\x02\0\0\x19\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\x02\x1a\0\0\0\xea\x02\0\0\x06\0\0\x04\x38\0\0\0\x9c\x01\0\0\x0e\0\0\
-\0\0\0\0\0\x9f\x01\0\0\x11\0\0\0\x20\0\0\0\xf7\x02\0\0\x1b\0\0\0\xc0\0\0\0\x08\
-\x03\0\0\x15\0\0\0\0\x01\0\0\x11\x03\0\0\x1d\0\0\0\x40\x01\0\0\x1b\x03\0\0\x1e\
-\0\0\0\x80\x01\0\0\0\0\0\0\0\0\0\x02\x1c\0\0\0\0\0\0\0\0\0\0\x0a\x10\0\0\0\0\0\
-\0\0\0\0\0\x02\x1f\0\0\0\0\0\0\0\0\0\0\x02\x20\0\0\0\x65\x03\0\0\x02\0\0\x04\
-\x08\0\0\0\x73\x03\0\0\x0e\0\0\0\0\0\0\0\x7c\x03\0\0\x0e\0\0\0\x20\0\0\0\x1b\
-\x03\0\0\x03\0\0\x04\x18\0\0\0\x86\x03\0\0\x1b\0\0\0\0\0\0\0\x8e\x03\0\0\x21\0\
-\0\0\x40\0\0\0\x94\x03\0\0\x23\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\x02\x22\0\0\0\0\0\
-\0\0\0\0\0\x02\x24\0\0\0\x98\x03\0\0\x01\0\0\x04\x04\0\0\0\xa3\x03\0\0\x0e\0\0\
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-\0\0\0\0";
- opts.insns_sz = 2216;
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+ opts.insns_sz = 2456;
opts.insns = (void *)"\
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@@ -331,79 +326,83 @@ iterators_bpf__load(struct iterators_bpf *skel)
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+\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\
+\0\0\x01\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\
+\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x80\x12\0\0\x61\x01\0\0\0\0\0\0\
+\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x2c\xff\
+\0\0\0\0\x63\x7a\x80\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xd0\x12\0\0\x18\
+\x61\0\0\0\0\0\0\0\0\0\0\xa8\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\
+\0\0\0\xd8\x12\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xa0\x17\0\0\x7b\x01\0\0\0\0\0\0\
+\x18\x60\0\0\0\0\0\0\0\0\0\0\xe0\x14\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xe8\x17\0\
+\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xe8\x14\0\0\x18\x61\0\0\0\0\
+\0\0\0\0\0\0\xf8\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x78\
+\x16\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x18\x18\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x10\x18\0\0\x7b\x01\0\0\
+\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xb0\x17\0\0\x63\x01\
+\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xb4\x17\0\0\x63\
+\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xb8\x17\0\0\
+\x7b\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xe0\
+\x17\0\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x28\x18\0\0\xb7\x02\0\
+\0\x12\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\
+\x07\0\0\0\0\0\0\xc5\x07\xf5\xfe\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x98\x17\0\
+\0\x63\x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\
+\0\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x98\x17\0\0\xb7\x03\0\0\x8c\0\0\0\x85\
+\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x08\x18\0\0\
+\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\
+\0\0\xc5\x07\xe3\xfe\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\
+\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\
+\0\0\0\0\x63\x06\x28\0\0\0\0\0\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\0\0\0\0\0\
+\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\0\0\
+\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
err = bpf_load_and_run(&opts);
if (err < 0)
return err;
- skel->rodata = skel_finalize_map_data(&skel->maps.rodata.initial_value,
- 4096, PROT_READ, skel->maps.rodata.map_fd);
- if (!skel->rodata)
- return -ENOMEM;
return 0;
}
@@ -422,4 +421,15 @@ iterators_bpf__open_and_load(void)
return skel;
}
+__attribute__((unused)) static void
+iterators_bpf__assert(struct iterators_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
#endif /* __ITERATORS_BPF_SKEL_H__ */
diff --git a/kernel/bpf/ringbuf.c b/kernel/bpf/ringbuf.c
index 875ac9b698d9..f045fde632e5 100644
--- a/kernel/bpf/ringbuf.c
+++ b/kernel/bpf/ringbuf.c
@@ -23,15 +23,6 @@
#define RINGBUF_MAX_RECORD_SZ (UINT_MAX/4)
-/* Maximum size of ring buffer area is limited by 32-bit page offset within
- * record header, counted in pages. Reserve 8 bits for extensibility, and take
- * into account few extra pages for consumer/producer pages and
- * non-mmap()'able parts. This gives 64GB limit, which seems plenty for single
- * ring buffer.
- */
-#define RINGBUF_MAX_DATA_SZ \
- (((1ULL << 24) - RINGBUF_POS_PAGES - RINGBUF_PGOFF) * PAGE_SIZE)
-
struct bpf_ringbuf {
wait_queue_head_t waitq;
struct irq_work work;
@@ -161,6 +152,17 @@ static void bpf_ringbuf_notify(struct irq_work *work)
wake_up_all(&rb->waitq);
}
+/* Maximum size of ring buffer area is limited by 32-bit page offset within
+ * record header, counted in pages. Reserve 8 bits for extensibility, and
+ * take into account few extra pages for consumer/producer pages and
+ * non-mmap()'able parts, the current maximum size would be:
+ *
+ * (((1ULL << 24) - RINGBUF_POS_PAGES - RINGBUF_PGOFF) * PAGE_SIZE)
+ *
+ * This gives 64GB limit, which seems plenty for single ring buffer. Now
+ * considering that the maximum value of data_sz is (4GB - 1), there
+ * will be no overflow, so just note the size limit in the comments.
+ */
static struct bpf_ringbuf *bpf_ringbuf_alloc(size_t data_sz, int numa_node)
{
struct bpf_ringbuf *rb;
@@ -193,12 +195,6 @@ static struct bpf_map *ringbuf_map_alloc(union bpf_attr *attr)
!PAGE_ALIGNED(attr->max_entries))
return ERR_PTR(-EINVAL);
-#ifdef CONFIG_64BIT
- /* on 32-bit arch, it's impossible to overflow record's hdr->pgoff */
- if (attr->max_entries > RINGBUF_MAX_DATA_SZ)
- return ERR_PTR(-E2BIG);
-#endif
-
rb_map = bpf_map_area_alloc(sizeof(*rb_map), NUMA_NO_NODE);
if (!rb_map)
return ERR_PTR(-ENOMEM);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index a2aef900519c..ee8cb1a174aa 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -3295,6 +3295,25 @@ static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
raw_tp_link->btp->tp->name);
}
+static int bpf_copy_to_user(char __user *ubuf, const char *buf, u32 ulen,
+ u32 len)
+{
+ if (ulen >= len + 1) {
+ if (copy_to_user(ubuf, buf, len + 1))
+ return -EFAULT;
+ } else {
+ char zero = '\0';
+
+ if (copy_to_user(ubuf, buf, ulen - 1))
+ return -EFAULT;
+ if (put_user(zero, ubuf + ulen - 1))
+ return -EFAULT;
+ return -ENOSPC;
+ }
+
+ return 0;
+}
+
static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
struct bpf_link_info *info)
{
@@ -3313,20 +3332,7 @@ static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
if (!ubuf)
return 0;
- if (ulen >= tp_len + 1) {
- if (copy_to_user(ubuf, tp_name, tp_len + 1))
- return -EFAULT;
- } else {
- char zero = '\0';
-
- if (copy_to_user(ubuf, tp_name, ulen - 1))
- return -EFAULT;
- if (put_user(zero, ubuf + ulen - 1))
- return -EFAULT;
- return -ENOSPC;
- }
-
- return 0;
+ return bpf_copy_to_user(ubuf, tp_name, ulen, tp_len);
}
static const struct bpf_link_ops bpf_raw_tp_link_lops = {
@@ -3358,9 +3364,155 @@ static void bpf_perf_link_dealloc(struct bpf_link *link)
kfree(perf_link);
}
+static int bpf_perf_link_fill_common(const struct perf_event *event,
+ char __user *uname, u32 ulen,
+ u64 *probe_offset, u64 *probe_addr,
+ u32 *fd_type)
+{
+ const char *buf;
+ u32 prog_id;
+ size_t len;
+ int err;
+
+ if (!ulen ^ !uname)
+ return -EINVAL;
+ if (!uname)
+ return 0;
+
+ err = bpf_get_perf_event_info(event, &prog_id, fd_type, &buf,
+ probe_offset, probe_addr);
+ if (err)
+ return err;
+
+ if (buf) {
+ len = strlen(buf);
+ err = bpf_copy_to_user(uname, buf, ulen, len);
+ if (err)
+ return err;
+ } else {
+ char zero = '\0';
+
+ if (put_user(zero, uname))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_KPROBE_EVENTS
+static int bpf_perf_link_fill_kprobe(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ char __user *uname;
+ u64 addr, offset;
+ u32 ulen, type;
+ int err;
+
+ uname = u64_to_user_ptr(info->perf_event.kprobe.func_name);
+ ulen = info->perf_event.kprobe.name_len;
+ err = bpf_perf_link_fill_common(event, uname, ulen, &offset, &addr,
+ &type);
+ if (err)
+ return err;
+ if (type == BPF_FD_TYPE_KRETPROBE)
+ info->perf_event.type = BPF_PERF_EVENT_KRETPROBE;
+ else
+ info->perf_event.type = BPF_PERF_EVENT_KPROBE;
+
+ info->perf_event.kprobe.offset = offset;
+ if (!kallsyms_show_value(current_cred()))
+ addr = 0;
+ info->perf_event.kprobe.addr = addr;
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_UPROBE_EVENTS
+static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ char __user *uname;
+ u64 addr, offset;
+ u32 ulen, type;
+ int err;
+
+ uname = u64_to_user_ptr(info->perf_event.uprobe.file_name);
+ ulen = info->perf_event.uprobe.name_len;
+ err = bpf_perf_link_fill_common(event, uname, ulen, &offset, &addr,
+ &type);
+ if (err)
+ return err;
+
+ if (type == BPF_FD_TYPE_URETPROBE)
+ info->perf_event.type = BPF_PERF_EVENT_URETPROBE;
+ else
+ info->perf_event.type = BPF_PERF_EVENT_UPROBE;
+ info->perf_event.uprobe.offset = offset;
+ return 0;
+}
+#endif
+
+static int bpf_perf_link_fill_probe(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+#ifdef CONFIG_KPROBE_EVENTS
+ if (event->tp_event->flags & TRACE_EVENT_FL_KPROBE)
+ return bpf_perf_link_fill_kprobe(event, info);
+#endif
+#ifdef CONFIG_UPROBE_EVENTS
+ if (event->tp_event->flags & TRACE_EVENT_FL_UPROBE)
+ return bpf_perf_link_fill_uprobe(event, info);
+#endif
+ return -EOPNOTSUPP;
+}
+
+static int bpf_perf_link_fill_tracepoint(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ char __user *uname;
+ u32 ulen;
+
+ uname = u64_to_user_ptr(info->perf_event.tracepoint.tp_name);
+ ulen = info->perf_event.tracepoint.name_len;
+ info->perf_event.type = BPF_PERF_EVENT_TRACEPOINT;
+ return bpf_perf_link_fill_common(event, uname, ulen, NULL, NULL, NULL);
+}
+
+static int bpf_perf_link_fill_perf_event(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ info->perf_event.event.type = event->attr.type;
+ info->perf_event.event.config = event->attr.config;
+ info->perf_event.type = BPF_PERF_EVENT_EVENT;
+ return 0;
+}
+
+static int bpf_perf_link_fill_link_info(const struct bpf_link *link,
+ struct bpf_link_info *info)
+{
+ struct bpf_perf_link *perf_link;
+ const struct perf_event *event;
+
+ perf_link = container_of(link, struct bpf_perf_link, link);
+ event = perf_get_event(perf_link->perf_file);
+ if (IS_ERR(event))
+ return PTR_ERR(event);
+
+ switch (event->prog->type) {
+ case BPF_PROG_TYPE_PERF_EVENT:
+ return bpf_perf_link_fill_perf_event(event, info);
+ case BPF_PROG_TYPE_TRACEPOINT:
+ return bpf_perf_link_fill_tracepoint(event, info);
+ case BPF_PROG_TYPE_KPROBE:
+ return bpf_perf_link_fill_probe(event, info);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
static const struct bpf_link_ops bpf_perf_link_lops = {
.release = bpf_perf_link_release,
.dealloc = bpf_perf_link_dealloc,
+ .fill_link_info = bpf_perf_link_fill_link_info,
};
static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 930b5555cfd3..0b9da95331d7 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -25,6 +25,7 @@
#include <linux/btf_ids.h>
#include <linux/poison.h>
#include <linux/module.h>
+#include <linux/cpumask.h>
#include "disasm.h"
@@ -6067,6 +6068,11 @@ static int check_ptr_to_btf_access(struct bpf_verifier_env *env,
type_is_rcu_or_null(env, reg, field_name, btf_id)) {
/* __rcu tagged pointers can be NULL */
flag |= MEM_RCU | PTR_MAYBE_NULL;
+
+ /* We always trust them */
+ if (type_is_rcu_or_null(env, reg, field_name, btf_id) &&
+ flag & PTR_UNTRUSTED)
+ flag &= ~PTR_UNTRUSTED;
} else if (flag & (MEM_PERCPU | MEM_USER)) {
/* keep as-is */
} else {
@@ -9117,19 +9123,33 @@ static void do_refine_retval_range(struct bpf_reg_state *regs, int ret_type,
{
struct bpf_reg_state *ret_reg = &regs[BPF_REG_0];
- if (ret_type != RET_INTEGER ||
- (func_id != BPF_FUNC_get_stack &&
- func_id != BPF_FUNC_get_task_stack &&
- func_id != BPF_FUNC_probe_read_str &&
- func_id != BPF_FUNC_probe_read_kernel_str &&
- func_id != BPF_FUNC_probe_read_user_str))
+ if (ret_type != RET_INTEGER)
return;
- ret_reg->smax_value = meta->msize_max_value;
- ret_reg->s32_max_value = meta->msize_max_value;
- ret_reg->smin_value = -MAX_ERRNO;
- ret_reg->s32_min_value = -MAX_ERRNO;
- reg_bounds_sync(ret_reg);
+ switch (func_id) {
+ case BPF_FUNC_get_stack:
+ case BPF_FUNC_get_task_stack:
+ case BPF_FUNC_probe_read_str:
+ case BPF_FUNC_probe_read_kernel_str:
+ case BPF_FUNC_probe_read_user_str:
+ ret_reg->smax_value = meta->msize_max_value;
+ ret_reg->s32_max_value = meta->msize_max_value;
+ ret_reg->smin_value = -MAX_ERRNO;
+ ret_reg->s32_min_value = -MAX_ERRNO;
+ reg_bounds_sync(ret_reg);
+ break;
+ case BPF_FUNC_get_smp_processor_id:
+ ret_reg->umax_value = nr_cpu_ids - 1;
+ ret_reg->u32_max_value = nr_cpu_ids - 1;
+ ret_reg->smax_value = nr_cpu_ids - 1;
+ ret_reg->s32_max_value = nr_cpu_ids - 1;
+ ret_reg->umin_value = 0;
+ ret_reg->u32_min_value = 0;
+ ret_reg->smin_value = 0;
+ ret_reg->s32_min_value = 0;
+ reg_bounds_sync(ret_reg);
+ break;
+ }
}
static int
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 98c1544cf572..f95cfb5bf2ee 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -493,7 +493,6 @@ static inline void rcu_expedite_gp(void) { }
static inline void rcu_unexpedite_gp(void) { }
static inline void rcu_async_hurry(void) { }
static inline void rcu_async_relax(void) { }
-static inline void rcu_request_urgent_qs_task(struct task_struct *t) { }
#else /* #ifdef CONFIG_TINY_RCU */
bool rcu_gp_is_normal(void); /* Internal RCU use. */
bool rcu_gp_is_expedited(void); /* Internal RCU use. */
@@ -508,7 +507,6 @@ void show_rcu_tasks_gp_kthreads(void);
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
static inline void show_rcu_tasks_gp_kthreads(void) {}
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */
-void rcu_request_urgent_qs_task(struct task_struct *t);
#endif /* #else #ifdef CONFIG_TINY_RCU */
#define RCU_SCHEDULER_INACTIVE 0
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 5f2dcabad202..c92eb8c6ff08 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2369,9 +2369,13 @@ int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
if (is_tracepoint || is_syscall_tp) {
*buf = is_tracepoint ? event->tp_event->tp->name
: event->tp_event->name;
- *fd_type = BPF_FD_TYPE_TRACEPOINT;
- *probe_offset = 0x0;
- *probe_addr = 0x0;
+ /* We allow NULL pointer for tracepoint */
+ if (fd_type)
+ *fd_type = BPF_FD_TYPE_TRACEPOINT;
+ if (probe_offset)
+ *probe_offset = 0x0;
+ if (probe_addr)
+ *probe_addr = 0x0;
} else {
/* kprobe/uprobe */
err = -EOPNOTSUPP;
@@ -2384,7 +2388,7 @@ int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
#ifdef CONFIG_UPROBE_EVENTS
if (flags & TRACE_EVENT_FL_UPROBE)
err = bpf_get_uprobe_info(event, fd_type, buf,
- probe_offset,
+ probe_offset, probe_addr,
event->attr.type == PERF_TYPE_TRACEPOINT);
#endif
}
@@ -2469,6 +2473,7 @@ struct bpf_kprobe_multi_link {
u32 cnt;
u32 mods_cnt;
struct module **mods;
+ u32 flags;
};
struct bpf_kprobe_multi_run_ctx {
@@ -2558,9 +2563,44 @@ static void bpf_kprobe_multi_link_dealloc(struct bpf_link *link)
kfree(kmulti_link);
}
+static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link,
+ struct bpf_link_info *info)
+{
+ u64 __user *uaddrs = u64_to_user_ptr(info->kprobe_multi.addrs);
+ struct bpf_kprobe_multi_link *kmulti_link;
+ u32 ucount = info->kprobe_multi.count;
+ int err = 0, i;
+
+ if (!uaddrs ^ !ucount)
+ return -EINVAL;
+
+ kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link);
+ info->kprobe_multi.count = kmulti_link->cnt;
+ info->kprobe_multi.flags = kmulti_link->flags;
+
+ if (!uaddrs)
+ return 0;
+ if (ucount < kmulti_link->cnt)
+ err = -ENOSPC;
+ else
+ ucount = kmulti_link->cnt;
+
+ if (kallsyms_show_value(current_cred())) {
+ if (copy_to_user(uaddrs, kmulti_link->addrs, ucount * sizeof(u64)))
+ return -EFAULT;
+ } else {
+ for (i = 0; i < ucount; i++) {
+ if (put_user(0, uaddrs + i))
+ return -EFAULT;
+ }
+ }
+ return err;
+}
+
static const struct bpf_link_ops bpf_kprobe_multi_link_lops = {
.release = bpf_kprobe_multi_link_release,
.dealloc = bpf_kprobe_multi_link_dealloc,
+ .fill_link_info = bpf_kprobe_multi_link_fill_link_info,
};
static void bpf_kprobe_multi_cookie_swap(void *a, void *b, int size, const void *priv)
@@ -2874,6 +2914,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
link->addrs = addrs;
link->cookies = cookies;
link->cnt = cnt;
+ link->flags = flags;
if (cookies) {
/*
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 23dba01831f7..17c21c0b2dd1 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1561,15 +1561,10 @@ int bpf_get_kprobe_info(const struct perf_event *event, u32 *fd_type,
*fd_type = trace_kprobe_is_return(tk) ? BPF_FD_TYPE_KRETPROBE
: BPF_FD_TYPE_KPROBE;
- if (tk->symbol) {
- *symbol = tk->symbol;
- *probe_offset = tk->rp.kp.offset;
- *probe_addr = 0;
- } else {
- *symbol = NULL;
- *probe_offset = 0;
- *probe_addr = (unsigned long)tk->rp.kp.addr;
- }
+ *probe_offset = tk->rp.kp.offset;
+ *probe_addr = kallsyms_show_value(current_cred()) ?
+ (unsigned long)tk->rp.kp.addr : 0;
+ *symbol = tk->symbol;
return 0;
}
#endif /* CONFIG_PERF_EVENTS */
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index fa09b33ee731..eaa800530e92 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1417,7 +1417,7 @@ static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type,
const char **filename, u64 *probe_offset,
- bool perf_type_tracepoint)
+ u64 *probe_addr, bool perf_type_tracepoint)
{
const char *pevent = trace_event_name(event->tp_event);
const char *group = event->tp_event->class->system;
@@ -1434,6 +1434,7 @@ int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type,
: BPF_FD_TYPE_UPROBE;
*filename = tu->filename;
*probe_offset = tu->offset;
+ *probe_addr = 0;
return 0;
}
#endif /* CONFIG_PERF_EVENTS */
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