From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy2-f41.google.com (mail-dy2-f41.google.com [74.125.229.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 264224E4302 for ; Thu, 1 Oct 2026 09:35:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.229.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790847353; cv=none; b=a55rdrGyw13OLvr4FMJf3FcH+n8gBGc8IJIJbHsXuIrS9jIrI8BkGlCyjy8D2GOrknwg7/IB6NhNj+PqityV7eEWDvSxf6jCVRY3x2v37YtSpf/DKpU9BewMrtmeLzpZ5H47Ly2oFTinv4ViZnHUs3r3NJHT8cAA3Tlcs30Z4g0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790847353; c=relaxed/simple; bh=mpG8mcoI/dDXU0KSIMfFTBXxDshCigaoUbowi5yjPoQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CxKoOHqbfEz3XfIN4DZdGU2IUIotypEp4dn2ogwsxTIEmMgYva5lN5Ub3CGCQw5mY/1Bl1VZV7x8Y2zr5Db8zlsOQ4XGisMwqOZOKansUdGiDV6DA7r8KzyrldkdiaapFXjOqX/hSVej2l5nLrzGimRcQjaHEdexEYR0EfBd7/Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=W0CDQ0R+; arc=none smtp.client-ip=74.125.229.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="W0CDQ0R+" Received: by mail-dy2-f41.google.com with SMTP id 5a478bee46e88-34daf1b9a1fso612359eec.2 for ; Thu, 01 Oct 2026 02:35:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790847350; x=1791452150; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=aAz5snqfAkudHA86VdYviv8NA1pdaM+oDlkyjTBWf/k=; b=W0CDQ0R+nQZy+sDOU875sl6D6LuZphpsKBm/MF98EiPSnnZLNwZHKCsLGmpN8PHJG3 5K4YUWvC96uYuip++uQw6bqVjmOWB0KIG3gPK1D/2Bwa58RaCnQNAIrHsOK0Oh9tOFOX sVetehrqZigqy3V4ngB6QG/n6ZxZr0hq2Af2sCY1+CmWErAe5VMWAUS7F+JoQkpmr1Tc pZxcOzhinTkKUeHNhc+tLgdWRNJAEu+H7ESbgjhVef8j01dqCBtIaZvQQmPTUBr1PjtA uXcalO0VkJoEVhqrjP83vdWDLPMkz/2Yu8iK/jsb7Te73N+XWGMMJUAh096G3uHLy3qc /3+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790847350; x=1791452150; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=aAz5snqfAkudHA86VdYviv8NA1pdaM+oDlkyjTBWf/k=; b=Rw9H42e5C7wA5TXnmlV9DtPVzfJlvOWFx+Ysjk8u2mEZGyd6HdwOYsNPMkgLiiO9l2 0EFmpQZn3/ZIs/sR1HJGYXjqiF6/hp8zT3SS4qQRFURLbm04r1RclbSendcE/cL3fwY/ zNPzyycpwJjKKSRRB73t/nEl2THhdGbFKEPDbq/aGVWzZ4CgDVQjXy9uBG4gkb0bapI7 u5tgSG1tK9BFweyZyiidpwGZnj6ggYnwM3tTdfoM/o25kw9WVBc5w07UwqxRSX5JdVSs gzwXMmM9U6o50bDPTU3e1+vNcy/PGfBej5zNF/z4JtDw3E+yRn2pNgVweUVpjdOgElEF LAIA== X-Forwarded-Encrypted: i=1; AKwUvByf9Q2dU5mvelu39pEmXuscdB6gcvp26N6RUJPZpOZdRCAMOSn6JBKpiPlBJ71QEbU11MWyfsQmLsQg2AKrZYk=@vger.kernel.org X-Gm-Message-State: AFq9FYJVd0K9cf5qJd+XugKueVsPHBZi1yJ6YYXwFSPrceaJr9AfZ/7z nMsUlnTstoMhLA/hW/655kkPL6pEKy+FYBbejrt+QHLPN1/QR5ddVSjK X-Gm-Gg: AYBFou00okW45laVGgb3F9WRvc0lziZkBaJr4jq0QBApkYkd81wixA0ckSnheJTnMU5 vriM5kGQjKeYH+B6iqz/GsCayDAK7rXa2J+6VIEeR0HYwBYLoezoD+uhmG3bFWdUnwdc3Y8XvCV 0syIAZPGJseYP99TANtqvoI0G80KO9GvVPenpaoFwD8wIUTIfByQ+/ypovqFQeqVqJlVJ0spql2 XMUMzUoe5rpdH9qODPyoNNu4ja32qXlrhegM35uCup+CpxSfhxQYmoEi+v3XjAiKBB3jEIdc4cd UYxpYJcKAssAo3Bf2Kvh7LJbbwR90N8L4YIXiwQvB+U4bQF9ehMzCtHWXIS15X1uP9nqWdL8yNY JI+QJWtj7DJouu7R2hJ81zVwsQHXc/bXKEMiBMOFdut2H3Bc5H1lrMN3DlrY5k0Cvmj8y9RKVvy pbwd+wjKn+aZ+nyACbXJx4lL8cqEbaLSdRNs52dqLrcA0OmDxwuj0BbgYFrEPDUbW9ySABneZrJ 5i3Og== X-Received: by 2002:a05:693c:8948:10b0:33a:f8c8:1d47 with SMTP id 5a478bee46e88-34cdc9bd06emr4263009eec.28.1790847350110; Thu, 01 Oct 2026 02:35:50 -0700 (PDT) Received: from [127.0.1.1] ([23.254.208.9]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-34db37507a7sm6003982eec.13.2026.10.01.02.35.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Oct 2026 02:35:49 -0700 (PDT) From: Qiliang Yuan Date: Thu, 01 Oct 2026 17:35:33 +0800 Subject: [PATCH bpf-next 2/4] bpf: Queue the rewrites of bpf_do_misc_fixups() and apply them at once Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261001-bpf-verifier-patch-batch-v1-2-a12df8a09160@gmail.com> References: <20261001-bpf-verifier-patch-batch-v1-0-a12df8a09160@gmail.com> In-Reply-To: <20261001-bpf-verifier-patch-batch-v1-0-a12df8a09160@gmail.com> To: Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Shuah Khan Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Qiliang Yuan X-Mailer: b4 0.13.0 Each rewrite in the main loop of bpf_do_misc_fixups() patches the program right away, which costs O(prog->len) per rewrite. Queue them with bpf_patch_list_add() instead and commit them once the loop is done, before the stack of subprogs is initialized for may_goto. The loop now walks the unpatched program, delta stays 0. A rewrite that fixes up the helper call after queueing it goes on to patch_call_imm with insn pointing to the queued copy of the call, so step insn from the program by index instead of incrementing it. Signed-off-by: Qiliang Yuan --- kernel/bpf/fixups.c | 228 +++++++++++++++++----------------------------------- 1 file changed, 72 insertions(+), 156 deletions(-) diff --git a/kernel/bpf/fixups.c b/kernel/bpf/fixups.c index 39566f3825108..4b96f4ee9b3d8 100644 --- a/kernel/bpf/fixups.c +++ b/kernel/bpf/fixups.c @@ -2099,13 +2099,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = patch - insn_buf; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2190,13 +2186,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = patch - insn_buf; } - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2220,13 +2212,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) *patch++ = BPF_MOV64_IMM(insn->dst_reg, 0); cnt = patch - insn_buf; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2240,13 +2228,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) return -EFAULT; } - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2293,13 +2277,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) *patch++ = BPF_ALU64_IMM(BPF_MUL, off_reg, -1); cnt = patch - insn_buf; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2336,13 +2316,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = may_goto_expand(insn_buf, insn->off, stack_off_cnt, tail, ARRAY_SIZE(tail)); - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } else if (bpf_is_may_goto_insn(insn)) { int stack_off = -stack_depth - 8; @@ -2355,13 +2331,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = may_goto_expand(insn_buf, insn->off, stack_off, tail, ARRAY_SIZE(tail)); - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2392,13 +2364,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = 2; i++; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2413,13 +2381,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) if (cnt == 0) goto next_insn; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2500,13 +2464,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) map)->index_mask); insn_buf[2] = *insn; cnt = 3; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2534,13 +2494,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[2] = *insn; cnt = 3; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto patch_call_imm; } @@ -2553,13 +2509,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[1] = *insn; cnt = 2; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto patch_call_imm; } @@ -2596,14 +2548,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) if (bpf_map_is_percpu_map(map_ptr->map_type)) prog->jit_required = true; - new_prog = bpf_patch_insn_data(env, i + delta, - insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2679,14 +2626,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) BPF_REG_0, 0); cnt = 3; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, - cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2709,13 +2651,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[0] = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); cnt = 1; #endif - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2728,13 +2666,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[2] = BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0); cnt = 3; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } #endif @@ -2762,13 +2696,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[cnt++] = BPF_JMP_A(1); insn_buf[cnt++] = BPF_MOV64_IMM(BPF_REG_0, -EINVAL); - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2794,13 +2724,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = 1; } - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2820,13 +2746,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) cnt = 2; } - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2836,12 +2758,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) /* Load IP address from ctx - 16 */ insn_buf[0] = BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -16); - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, 1); - if (!new_prog) - return -ENOMEM; - - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, 1); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2891,13 +2810,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[10] = BPF_MOV64_IMM(BPF_REG_0, -ENOENT); cnt = 11; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } @@ -2909,13 +2824,9 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) insn_buf[1] = BPF_ATOMIC_OP(BPF_DW, BPF_XCHG, BPF_REG_1, BPF_REG_0, 0); cnt = 2; - new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt); - if (!new_prog) - return -ENOMEM; - - delta += cnt - 1; - env->prog = prog = new_prog; - insn = new_prog->insnsi + i + delta; + insn = bpf_patch_list_add(env, i + delta, insn_buf, cnt); + if (IS_ERR(insn)) + return PTR_ERR(insn); goto next_insn; } patch_call_imm: @@ -2946,9 +2857,14 @@ int bpf_do_misc_fixups(struct bpf_verifier_env *env) stack_depth_extra = 0; } i++; - insn++; + insn = &prog->insnsi[i + delta]; } + ret = bpf_patch_list_commit(env); + if (ret) + return ret; + prog = env->prog; + env->prog->aux->stack_depth = subprogs[0].stack_depth; for (i = 0; i < env->subprog_cnt; i++) { int delta = bpf_jit_supports_timed_may_goto() ? 2 : 1; -- 2.43.0