From patchwork Tue Sep 17 08:50:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13806009 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 DD2D514BFBF; Tue, 17 Sep 2024 08:51:22 +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=1726563083; cv=none; b=W+WydSc0aF/aPoVB1tPQUqByUa7//NtVg2XBPohonIq8MwKUbeNlHt/tg0t7DQ0M9a0m9kMhwCo7q9X8oK7PcvjrQB55S8pMoFuYGfhK7Qeoisc1/mVZZsRxkmHl9kQmkTFgoqUovRcHG7VS6Sfkzlc0EWs+5SDWqyzY+hP3DDY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563083; c=relaxed/simple; bh=E5ksyVpxSxCr84wbzqQecnCcRAmkbzdRXeqaxZgzDAk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hjHKFudTedRDUOXuc7PRczjODkr+l7FyRk8IQUZWl3huRI7MAlMus1ADlDEztBwiHwgC+R8ekRDy1v9OQYdPDajMx6qMNS6Ukjna022Cv75FBTOapaYcUx9Q2EClVTZUXNorH6nWFGxKSW/zDNKCnRJr+LrV5cJ5Z7IisifyudU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HV4undIu; 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="HV4undIu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A74D8C4CEC5; Tue, 17 Sep 2024 08:51:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563082; bh=E5ksyVpxSxCr84wbzqQecnCcRAmkbzdRXeqaxZgzDAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HV4undIuFFhagswIduRHdKj+/C0WeX/RVy8WqGPRx0pIJH6ZlwwYOAmC2FOq9YAfF paiFkPLgG4D5OCt7n8yXI/ZFdHXbJalZLoXm0UnVGzXAgm8anExBBPPL3c/whrw8UG bkCFQfYJa+F7eCO19NMdW03vJIXjTJotB4CpF0lszHEoJkU6dVI+8wqWrexcIurWs4 rs/ZbmY1u2OmRQyQle5vBtd8i7YKJNSH72OTRoJbj9RLs5387uoon1DF5YzhickQMQ 4tBUYzP+WAeEK2wO72JnY/wf0lOrlDWbH6dA17gkrNORBjYw4UTDj2rOJU9Jsm9HU1 NMIH5c7P85oxg== 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: [PATCHv4 04/14] bpf: Add support for uprobe multi session context Date: Tue, 17 Sep 2024 10:50:14 +0200 Message-ID: <20240917085024.765883-5-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Placing bpf_session_run_ctx layer in between bpf_run_ctx and bpf_uprobe_multi_run_ctx, so the session data can be retrieved from uprobe_multi link. Plus granting session kfuncs access to uprobe session programs. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- kernel/trace/bpf_trace.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 63ea457af16a..b6f377f1ce5f 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3186,7 +3186,7 @@ struct bpf_uprobe_multi_link { }; struct bpf_uprobe_multi_run_ctx { - struct bpf_run_ctx run_ctx; + struct bpf_session_run_ctx session_ctx; unsigned long entry_ip; struct bpf_uprobe *uprobe; }; @@ -3299,10 +3299,15 @@ static const struct bpf_link_ops bpf_uprobe_multi_link_lops = { static int uprobe_prog_run(struct bpf_uprobe *uprobe, unsigned long entry_ip, - struct pt_regs *regs) + struct pt_regs *regs, + bool is_return, void *data) { struct bpf_uprobe_multi_link *link = uprobe->link; struct bpf_uprobe_multi_run_ctx run_ctx = { + .session_ctx = { + .is_return = is_return, + .data = data, + }, .entry_ip = entry_ip, .uprobe = uprobe, }; @@ -3321,7 +3326,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, migrate_disable(); - old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); + old_run_ctx = bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx); err = bpf_prog_run(link->link.prog, regs); bpf_reset_run_ctx(old_run_ctx); @@ -3351,7 +3356,7 @@ uprobe_multi_link_handler(struct uprobe_consumer *con, struct pt_regs *regs, int ret; uprobe = container_of(con, struct bpf_uprobe, consumer); - ret = uprobe_prog_run(uprobe, instruction_pointer(regs), regs); + ret = uprobe_prog_run(uprobe, instruction_pointer(regs), regs, false, data); if (uprobe->session) return ret ? UPROBE_HANDLER_IGNORE : UPROBE_HANDLER_IWANTMYCOOKIE; return ret; @@ -3370,14 +3375,15 @@ uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long func, s */ if (uprobe->session && !data) return 0; - return uprobe_prog_run(uprobe, func, regs); + return uprobe_prog_run(uprobe, func, regs, true, data); } static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) { struct bpf_uprobe_multi_run_ctx *run_ctx; - run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, run_ctx); + run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, + session_ctx.run_ctx); return run_ctx->entry_ip; } @@ -3385,7 +3391,8 @@ static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) { struct bpf_uprobe_multi_run_ctx *run_ctx; - run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, run_ctx); + run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, + session_ctx.run_ctx); return run_ctx->uprobe->cookie; } @@ -3579,7 +3586,7 @@ static int bpf_kprobe_multi_filter(const struct bpf_prog *prog, u32 kfunc_id) if (!btf_id_set8_contains(&kprobe_multi_kfunc_set_ids, kfunc_id)) return 0; - if (!is_kprobe_session(prog)) + if (!is_kprobe_session(prog) && !is_uprobe_session(prog)) return -EACCES; return 0;