* [PATCH 6.6.y 2/2] bpf: support deferring bpf_link dealloc to after RCU grace period
2024-04-05 16:38 ` [PATCH 6.6.y 1/2] bpf: put uprobe link's path and task in release callback Andrii Nakryiko
@ 2024-04-05 16:38 ` Andrii Nakryiko
2024-04-08 11:41 ` [PATCH 6.6.y 1/2] bpf: put uprobe link's path and task in release callback Greg KH
1 sibling, 0 replies; 3+ messages in thread
From: Andrii Nakryiko @ 2024-04-05 16:38 UTC (permalink / raw)
To: stable
Cc: bpf, Andrii Nakryiko, Alexei Starovoitov,
syzbot+981935d9485a560bfbcb, syzbot+2cb5a6c573e98db598cc,
syzbot+62d8b26793e8a2bd0516, Jiri Olsa
BPF link for some program types is passed as a "context" which can be
used by those BPF programs to look up additional information. E.g., for
multi-kprobes and multi-uprobes, link is used to fetch BPF cookie values.
Because of this runtime dependency, when bpf_link refcnt drops to zero
there could still be active BPF programs running accessing link data.
This patch adds generic support to defer bpf_link dealloc callback to
after RCU GP, if requested. This is done by exposing two different
deallocation callbacks, one synchronous and one deferred. If deferred
one is provided, bpf_link_free() will schedule dealloc_deferred()
callback to happen after RCU GP.
BPF is using two flavors of RCU: "classic" non-sleepable one and RCU
tasks trace one. The latter is used when sleepable BPF programs are
used. bpf_link_free() accommodates that by checking underlying BPF
program's sleepable flag, and goes either through normal RCU GP only for
non-sleepable, or through RCU tasks trace GP *and* then normal RCU GP
(taking into account rcu_trace_implies_rcu_gp() optimization), if BPF
program is sleepable.
We use this for multi-kprobe and multi-uprobe links, which dereference
link during program run. We also preventively switch raw_tp link to use
deferred dealloc callback, as upcoming changes in bpf-next tree expose
raw_tp link data (specifically, cookie value) to BPF program at runtime
as well.
Fixes: 0dcac2725406 ("bpf: Add multi kprobe link")
Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Reported-by: syzbot+981935d9485a560bfbcb@syzkaller.appspotmail.com
Reported-by: syzbot+2cb5a6c573e98db598cc@syzkaller.appspotmail.com
Reported-by: syzbot+62d8b26793e8a2bd0516@syzkaller.appspotmail.com
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20240328052426.3042617-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
(cherry picked from commit 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce)
---
include/linux/bpf.h | 16 +++++++++++++++-
kernel/bpf/syscall.c | 35 ++++++++++++++++++++++++++++++++---
kernel/trace/bpf_trace.c | 4 ++--
3 files changed, 49 insertions(+), 6 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 9b08d792fa95..2ebb5d4d43dc 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1524,12 +1524,26 @@ struct bpf_link {
enum bpf_link_type type;
const struct bpf_link_ops *ops;
struct bpf_prog *prog;
- struct work_struct work;
+ /* rcu is used before freeing, work can be used to schedule that
+ * RCU-based freeing before that, so they never overlap
+ */
+ union {
+ struct rcu_head rcu;
+ struct work_struct work;
+ };
};
struct bpf_link_ops {
void (*release)(struct bpf_link *link);
+ /* deallocate link resources callback, called without RCU grace period
+ * waiting
+ */
void (*dealloc)(struct bpf_link *link);
+ /* deallocate link resources callback, called after RCU grace period;
+ * if underlying BPF program is sleepable we go through tasks trace
+ * RCU GP and then "classic" RCU GP
+ */
+ void (*dealloc_deferred)(struct bpf_link *link);
int (*detach)(struct bpf_link *link);
int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
struct bpf_prog *old_prog);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 4b7d186c7622..4902a7487f07 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2866,17 +2866,46 @@ void bpf_link_inc(struct bpf_link *link)
atomic64_inc(&link->refcnt);
}
+static void bpf_link_defer_dealloc_rcu_gp(struct rcu_head *rcu)
+{
+ struct bpf_link *link = container_of(rcu, struct bpf_link, rcu);
+
+ /* free bpf_link and its containing memory */
+ link->ops->dealloc_deferred(link);
+}
+
+static void bpf_link_defer_dealloc_mult_rcu_gp(struct rcu_head *rcu)
+{
+ if (rcu_trace_implies_rcu_gp())
+ bpf_link_defer_dealloc_rcu_gp(rcu);
+ else
+ call_rcu(rcu, bpf_link_defer_dealloc_rcu_gp);
+}
+
/* bpf_link_free is guaranteed to be called from process context */
static void bpf_link_free(struct bpf_link *link)
{
+ bool sleepable = false;
+
bpf_link_free_id(link->id);
if (link->prog) {
+ sleepable = link->prog->aux->sleepable;
/* detach BPF program, clean up used resources */
link->ops->release(link);
bpf_prog_put(link->prog);
}
- /* free bpf_link and its containing memory */
- link->ops->dealloc(link);
+ if (link->ops->dealloc_deferred) {
+ /* schedule BPF link deallocation; if underlying BPF program
+ * is sleepable, we need to first wait for RCU tasks trace
+ * sync, then go through "classic" RCU grace period
+ */
+ if (sleepable)
+ call_rcu_tasks_trace(&link->rcu, bpf_link_defer_dealloc_mult_rcu_gp);
+ else
+ call_rcu(&link->rcu, bpf_link_defer_dealloc_rcu_gp);
+ }
+ if (link->ops->dealloc)
+ link->ops->dealloc(link);
}
static void bpf_link_put_deferred(struct work_struct *work)
@@ -3381,7 +3410,7 @@ static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
static const struct bpf_link_ops bpf_raw_tp_link_lops = {
.release = bpf_raw_tp_link_release,
- .dealloc = bpf_raw_tp_link_dealloc,
+ .dealloc_deferred = bpf_raw_tp_link_dealloc,
.show_fdinfo = bpf_raw_tp_link_show_fdinfo,
.fill_link_info = bpf_raw_tp_link_fill_link_info,
};
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 4d49a9f47e68..1e79084a9d9d 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2639,7 +2639,7 @@ static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link,
static const struct bpf_link_ops bpf_kprobe_multi_link_lops = {
.release = bpf_kprobe_multi_link_release,
- .dealloc = bpf_kprobe_multi_link_dealloc,
+ .dealloc_deferred = bpf_kprobe_multi_link_dealloc,
.fill_link_info = bpf_kprobe_multi_link_fill_link_info,
};
@@ -3081,7 +3081,7 @@ static void bpf_uprobe_multi_link_dealloc(struct bpf_link *link)
static const struct bpf_link_ops bpf_uprobe_multi_link_lops = {
.release = bpf_uprobe_multi_link_release,
- .dealloc = bpf_uprobe_multi_link_dealloc,
+ .dealloc_deferred = bpf_uprobe_multi_link_dealloc,
};
static int uprobe_prog_run(struct bpf_uprobe *uprobe,
--
2.43.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH 6.6.y 1/2] bpf: put uprobe link's path and task in release callback
2024-04-05 16:38 ` [PATCH 6.6.y 1/2] bpf: put uprobe link's path and task in release callback Andrii Nakryiko
2024-04-05 16:38 ` [PATCH 6.6.y 2/2] bpf: support deferring bpf_link dealloc to after RCU grace period Andrii Nakryiko
@ 2024-04-08 11:41 ` Greg KH
1 sibling, 0 replies; 3+ messages in thread
From: Greg KH @ 2024-04-08 11:41 UTC (permalink / raw)
To: Andrii Nakryiko; +Cc: stable, bpf, Alexei Starovoitov
On Fri, Apr 05, 2024 at 09:38:05AM -0700, Andrii Nakryiko wrote:
> There is no need to delay putting either path or task to deallocation
> step. It can be done right after bpf_uprobe_unregister. Between release
> and dealloc, there could be still some running BPF programs, but they
> don't access either task or path, only data in link->uprobes, so it is
> safe to do.
>
> On the other hand, doing path_put() in dealloc callback makes this
> dealloc sleepable because path_put() itself might sleep. Which is
> problematic due to the need to call uprobe's dealloc through call_rcu(),
> which is what is done in the next bug fix patch. So solve the problem by
> releasing these resources early.
>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
> Link: https://lore.kernel.org/r/20240328052426.3042617-1-andrii@kernel.org
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
> (cherry picked from commit e9c856cabefb71d47b2eeb197f72c9c88e9b45b0)
> ---
> kernel/trace/bpf_trace.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
All now queued up, thanks.
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread