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| author | Jiri Olsa <jolsa@kernel.org> | 2024-11-08 14:45:33 +0100 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2024-11-11 08:18:00 -0800 |
| commit | f505005bc7426f4309880da94cfbfc37efa225bd (patch) | |
| tree | ed33b18093c1fd543b3d9085c799a949ab04faac /kernel/trace | |
| parent | 17c4b65a24938c6dd79496cce5df15f70d9c253c (diff) | |
| download | lwn-f505005bc7426f4309880da94cfbfc37efa225bd.tar.gz lwn-f505005bc7426f4309880da94cfbfc37efa225bd.zip | |
bpf: Force uprobe bpf program to always return 0
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@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241108134544.480660-3-jolsa@kernel.org
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 88fd628850ca..db9e2792b42b 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3229,7 +3229,6 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, struct bpf_prog *prog = link->link.prog; bool sleepable = prog->sleepable; struct bpf_run_ctx *old_run_ctx; - int err = 0; if (link->task && !same_thread_group(current, link->task)) return 0; @@ -3242,7 +3241,7 @@ 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(); @@ -3251,7 +3250,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, rcu_read_unlock_trace(); else rcu_read_unlock(); - return err; + return 0; } static bool |