From patchwork Fri Nov 8 13:45:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13868220 X-Patchwork-Delegate: mhiramat@kernel.org 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 BC6B21EF098; Fri, 8 Nov 2024 13:46:52 +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=1731073612; cv=none; b=AATXtPLZakWq8cS5tsOgFeb00PuhQ+KJp/x5nyfM9qfqO0Yz06ziKTNviqMw2GUAJKB3CD/1h1jQediBth0jE6N1DSGAbG2VDWNSdGm7g2YOw/aBKhbjEdtKYeDveVDZj631PBe4UsA+Mdp1ipo9w3vVNAgZzZcSpr1McGcQ85Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731073612; c=relaxed/simple; bh=ZWTmD8ZM8J7T3zsvMkBvLrH1MCjRXUoNEp/NzcoHEvY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=V4ohNKCiRWl8pcyavRRoTCNig/3uE+YIabebFeDSMMu6Hg2mDZgxB34P23gtqdhNtYHAj+sNiGeKgv85xdVpaQiUrMGAN/j83Y7no3iwnoP5akIzf+tKpoQU6UYH7Z9UdFFCcetBApw/a/+nzb9+1vYf6CqNUUYwmlsTkUHkkPc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ffyh4FbU; 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="Ffyh4FbU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5987FC4CECD; Fri, 8 Nov 2024 13:46:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731073612; bh=ZWTmD8ZM8J7T3zsvMkBvLrH1MCjRXUoNEp/NzcoHEvY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ffyh4FbULga/CiSuIWTJv3WTBSuT0weFYaXUuZYlNNTIBLt7V8pbNTDAZ95UhpbvR iZCtayI4HqtmoQLKJlGkPqRgbm2ih3d2rj5xvRUPjDcrBl9qFho8L9opGgvfcYjtuI kQag8bxnQQOcIr1K/gHWPC8zL6WDpu23hjWu0GpHEEqqxxPhG8I913js15zYwDnRlj pV0YsXrw44bRSk4Lw3BJN3RZWmyODhI4mpJPU11wOUxIGGvyORCeoYsStTxof7JGFo rfcXPB/jffRpjGMlT/j2W6oEPE/StGsBNhs4fnZVx1EkzolfRBZ43RAepz8NEt1E3g G2cIb4/IB56bw== 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: [PATCHv9 bpf-next 04/13] bpf: Add support for uprobe multi session context Date: Fri, 8 Nov 2024 14:45:35 +0100 Message-ID: <20241108134544.480660-5-jolsa@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241108134544.480660-1-jolsa@kernel.org> References: <20241108134544.480660-1-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 | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 9c04b1364de2..949a3870946c 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3120,7 +3120,7 @@ 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; }; @@ -3231,16 +3231,22 @@ 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, }; struct bpf_prog *prog = link->link.prog; bool sleepable = prog->sleepable; struct bpf_run_ctx *old_run_ctx; + int err; if (link->task && !same_thread_group(current, link->task)) return 0; @@ -3252,8 +3258,8 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, migrate_disable(); - old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); - bpf_prog_run(link->link.prog, regs); + 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); migrate_enable(); @@ -3262,7 +3268,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, rcu_read_unlock_trace(); else rcu_read_unlock(); - return 0; + return err; } static bool @@ -3282,7 +3288,7 @@ 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 : 0; return 0; @@ -3295,7 +3301,7 @@ uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long func, s struct bpf_uprobe *uprobe; uprobe = container_of(con, struct bpf_uprobe, consumer); - uprobe_prog_run(uprobe, func, regs); + uprobe_prog_run(uprobe, func, regs, true, data); return 0; } @@ -3303,7 +3309,8 @@ 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; } @@ -3311,7 +3318,8 @@ 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; } @@ -3505,7 +3513,7 @@ 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;