6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jiri Olsa <jolsa@xxxxxxxxxx>
[ Upstream commit f505005bc7426f4309880da94cfbfc37efa225bd ]
As suggested by Andrii make uprobe multi bpf programs to always return 0,
so they can't force uprobe removal.
Keeping the int return type for uprobe_prog_run, because it will be used
in following session changes.
Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Suggested-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20241108134544.480660-3-jolsa@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/trace/bpf_trace.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 9064f75de7e46..e8fb6ada323c1 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3098,7 +3098,6 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe,
struct bpf_prog *prog = link->link.prog;
bool sleepable = prog->aux->sleepable;
struct bpf_run_ctx *old_run_ctx;
- int err = 0;
if (link->task && current->mm != link->task->mm)
return 0;
@@ -3111,7 +3110,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe,
migrate_disable();
old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
- err = bpf_prog_run(link->link.prog, regs);
+ bpf_prog_run(link->link.prog, regs);
bpf_reset_run_ctx(old_run_ctx);
migrate_enable();
@@ -3120,7 +3119,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe,
rcu_read_unlock_trace();
else
rcu_read_unlock();
- return err;
+ return 0;
}
static bool
--
2.43.0
