From patchwork Fri Oct 18 20:40:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13842352 X-Patchwork-Delegate: bpf@iogearbox.net Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 73A4618C35F; Fri, 18 Oct 2024 20:41:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729284103; cv=none; b=QzfIh9LyX2Ih4E5p0yxDFqlV7wMpmLBpxntb+FZ+7vRP0ajZnfIcbQg6p1lcRVEo+2xIYyJXoRQm4+vbKCWER4Lzu3DCg0o3r2f62+viMF1U/afBdYUBIFvmnJgJJUd1SYUGXVWSj46ObLMbkU4kM+8iSNfoSeqefHwfq/iem8A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729284103; c=relaxed/simple; bh=1HQNG9iWWO3wV8At9GP/jjQuJFQ7TICtEW1ksq9n0g0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q9GxqxfeKS5lQ80kmdd6oSwLRubyonjZNW7jOIsqecc/jIzoHcIqVoi82HHv7RQ0ogeSWL+YBza8dxEgg4aXaufRQ8dVDAwp9nrkRiVQT+E6Fj7ySfac+kKvXWWfABxCDaWKrOIyudx2h+c2mClv/scqjeeOlgyHeyXU9KjMCWw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KlcSv6rB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="KlcSv6rB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0D7DAC4CEC3; Fri, 18 Oct 2024 20:41:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729284103; bh=1HQNG9iWWO3wV8At9GP/jjQuJFQ7TICtEW1ksq9n0g0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KlcSv6rByKSeGI5t1xyThHi3wv/uhdTSddZUpO7unvqsFzXz2q+kYzcfbIV+uhfdG kLznR+hqvwpppSsZpKK3mhdWYq2tbjhIhY75Kr7oPREjrJJQSJFZHcqSa0I+xEhDgZ Q3fewB10CVt72DGeqlZLmqni8FKX1k9+yEu4sFpIdO26Egl4vmntV8P7AJLlZHwOi2 11cpxxwQlCwfhMbcu25mGmjKcZk1JGhjUW42JerCSXQ8OZ6b6XJ6KkeafPmh4eJB4Z APFM+U5N06mgn1VDUAvldoyysibASurPcZ+I8TsHSWEOXKyGfm0Ocjsw8uQm46Reo4 29AStF+WFTFnA== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv8 bpf-next 02/13] bpf: Force uprobe bpf program to always return 0 Date: Fri, 18 Oct 2024 22:40:58 +0200 Message-ID: <20241018204109.713820-3-jolsa@kernel.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241018204109.713820-1-jolsa@kernel.org> References: <20241018204109.713820-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net 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 Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- 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 fdab7ecd8dfa..3c1e5a561df4 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3209,7 +3209,6 @@ 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; @@ -3222,7 +3221,7 @@ 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(); @@ -3231,7 +3230,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, rcu_read_unlock_trace(); else rcu_read_unlock(); - return err; + return 0; } static bool