From nobody Tue Dec 16 21:10:24 2025 Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (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 E85B0313534 for ; Mon, 8 Dec 2025 06:24:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765175059; cv=none; b=sVqX9sZtA3YI5315UgdNenTuPgy7F1tfe60bI7WNw67F1yGgN3OzpLHgVBcgTy4UMdGtCJb0t5Cp3WwzxPoVzGtp03lOAS0VGKQjxyEEYvH8IS1G7J+lS9V3ujrwa6Z0skPrhdxEpwPH9oRAq8VXpyDOOt2LDhk1A60qRIqtvEg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765175059; c=relaxed/simple; bh=8hsjVTc4iHNm8LdtJrSwh8RnQyLo12TybfR54C1ppls=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BXKoi+iRXNPF93W7En3H9nOpbPVcloy+NkufbK3N5qbmVpwgD6Xf1u5E0oLQctY7CZqsV+lqsY3uKdcqERQw9XPHCmKbNzZITjSzbwXUkO/vXZMIvtzEVIeBGYd1jgO+Lhatbbxyd72avfP1e6iOXJnzI+k83y6bJ20QeOoiow0= 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=YYUWxGDO; arc=none smtp.client-ip=209.85.214.174 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="YYUWxGDO" Received: by mail-pl1-f174.google.com with SMTP id d9443c01a7336-297e239baecso37713385ad.1 for ; Sun, 07 Dec 2025 22:24:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1765175057; x=1765779857; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=xAB27SW8ze5pe2PA9+A7ZhKextxDBm6v0Soq1ZoL2Ng=; b=YYUWxGDO1vJ0tq4hnYCw3RgR0onyHkO/7yCOOwiusJrR0XTPvcVksqdiY6tD8WHzCe zVe1WAXdN+CjuWVTrkvdYoWCj1bCrzoSCe26kLxUAAzoABvZp2cdzlA9zpFKsnbbgDlU 1YkBwHLhAOcfIyjA2aDpiWlWU2Vs4vUMzfpl5wXuuovqiKwzhqU6biWVU3AYItsb2v3O NqOmGUr8u7Jwbd7t+rX0V7gKCibdcd6B59ArUoT5jOVFE+u6Izrmf5/rQ1MCouQ9q/sk S+LGsEDayugxdbrrf93+oVIXLoatd8da4zDHeaSEvGzm/f1QlEvnqp5dopACwoo8ol27 RmdQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765175057; x=1765779857; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=xAB27SW8ze5pe2PA9+A7ZhKextxDBm6v0Soq1ZoL2Ng=; b=OY/YUAxf2AKTOyy3JRBTW7vpKKQmxdlnbEchwk9Up2FyrNuo4cR/HAe65+a6/4fKqt 4X5p6YjGGs+KCQUT3uvqa4mt/L9MgOVh/kyL7tmWd9o8sbWaZ923coIU7ZLfe4aYhytS /Z/fJHk7pBW/mYiNzfqYl7a2c1foedG9LeWBm9R8RLRFXardiLEprYPZvp0FDbRLspAN q6cB5OF4Xb+r/WIQWgvGl0Rns1M61Pw0x4DlKi05VUFmFo3PIE3wTU9pyUDs3bD+HXHi Nshk389rtBOVXhcqpRSqRacecNs6lb3t1JEZo4AFcg2X99hXVxmf+eI2I67cwhp8r5cO AA4w== X-Forwarded-Encrypted: i=1; AJvYcCUp00Q6vr8IrYTHLfrdvbr9oNnuUT9qy0oulMxKroe3kkIUu9zxYmcQZM7JI7WnDR5pQPLk3ABBxhFnZWk=@vger.kernel.org X-Gm-Message-State: AOJu0YxJ0vKY4RbxwhA6X52771SP1UM2WD8ykwBhHVFu3JTeDYNYamCC XFGupLxJ3qtcJ84NErjsPKu5PzmeLFA0NiPL7YbSAk8ApR2DNtyDmDSw X-Gm-Gg: ASbGncv9ZI96VqqnCrE8h7FWBuAUC4NZsQ3M6pwb7qI8P+QvgL/AXV+mTPcY/QnIkV5 zUAuLzwcES7l809dMrhJjhZkfHNLdpS/Ub4G81ATNxRX4OunbClKyPhyGWzTBvmXxfw1+0zmGG2 /0EdeZrBhhM6MjaS3tj547a7AurfiyGB03i8HHrqD5dlwrWJ0wrJC6bP9YGImlJvKDDn3aC9Ho8 h4+SYgBez9J+YH3vdosgJd1ffPGPu0nPk0+loSpXPuKMMf7tr/cabvN4amDpQAH2UKRvG6KJeA/ 8wvVOGw3Kq9job7mowWASAfogeJEw1W170qXQ738OoXZb2Sbu0PbLediDKp5PRXAW4nStWUE1x/ 25Z/NPFEzUCYsYdNSZ4Mt7ALyZ7HhffffaymCo0hpmJUfNJj2Tvlzy1ERwO/h0yuEguOErCqvAq iQ2PNV3YaH+oT7yRrOujFGadUMtXg= X-Google-Smtp-Source: AGHT+IE+5YDDDuQsk4AB/Xv49ebPh4yjqmdlSSxW7j/cMhZAbaKPySX/s4q4XWI8x+qvn7t4NxuZzg== X-Received: by 2002:a17:902:fc46:b0:297:eafd:5c19 with SMTP id d9443c01a7336-29d9ec50fbfmr143611025ad.10.1765175057265; Sun, 07 Dec 2025 22:24:17 -0800 (PST) Received: from pengdl-pc.mioffice.cn ([43.224.245.249]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29dae49ca1esm112555855ad.2.2025.12.07.22.24.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 07 Dec 2025 22:24:15 -0800 (PST) From: Donglin Peng To: ast@kernel.org, andrii.nakryiko@gmail.com Cc: eddyz87@gmail.com, zhangxiaoqin@xiaomi.com, ihor.solodrai@linux.dev, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, pengdonglin , Alan Maguire Subject: [PATCH bpf-next v9 05/10] libbpf: Verify BTF Sorting Date: Mon, 8 Dec 2025 14:23:48 +0800 Message-Id: <20251208062353.1702672-6-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251208062353.1702672-1-dolinux.peng@gmail.com> References: <20251208062353.1702672-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: pengdonglin This patch checks whether the BTF is sorted by name in ascending order. If sorted, binary search will be used when looking up types. Cc: Eduard Zingerman Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Alan Maguire Cc: Ihor Solodrai Cc: Xiaoqin Zhang Signed-off-by: pengdonglin --- tools/lib/bpf/btf.c | 46 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c index 7f150c869bf6..a53d24704857 100644 --- a/tools/lib/bpf/btf.c +++ b/tools/lib/bpf/btf.c @@ -899,6 +899,49 @@ int btf__resolve_type(const struct btf *btf, __u32 typ= e_id) return type_id; } =20 +/* + * Assuming that types are sorted by name in ascending order. + */ +static int btf_compare_type_names(const void *a, const void *b, void *priv) +{ + struct btf *btf =3D (struct btf *)priv; + struct btf_type *ta =3D btf_type_by_id(btf, *(__u32 *)a); + struct btf_type *tb =3D btf_type_by_id(btf, *(__u32 *)b); + const char *na, *nb; + + na =3D btf__str_by_offset(btf, ta->name_off); + nb =3D btf__str_by_offset(btf, tb->name_off); + return strcmp(na, nb); +} + +static void btf_check_sorted(struct btf *btf) +{ + const struct btf_type *t; + int i, k =3D 0, n; + __u32 sorted_start_id =3D 0; + + if (btf->nr_types < 2) + return; + + n =3D btf__type_cnt(btf) - 1; + for (i =3D btf->start_id; i < n; i++) { + k =3D i + 1; + if (btf_compare_type_names(&i, &k, btf) > 0) + return; + t =3D btf_type_by_id(btf, i); + if (sorted_start_id =3D=3D 0 && + !str_is_empty(btf__str_by_offset(btf, t->name_off))) + sorted_start_id =3D i; + } + + t =3D btf_type_by_id(btf, k); + if (sorted_start_id =3D=3D 0 && + !str_is_empty(btf__str_by_offset(btf, t->name_off))) + sorted_start_id =3D k; + if (sorted_start_id) + btf->sorted_start_id =3D sorted_start_id; +} + static __s32 btf_find_by_name_bsearch(const struct btf *btf, const char *n= ame, __s32 start_id, __s32 end_id) { @@ -935,7 +978,7 @@ static __s32 btf_find_by_name_kind(const struct btf *bt= f, int start_id, =20 if (start_id < btf->start_id) { idx =3D btf_find_by_name_kind(btf->base_btf, start_id, - type_name, kind); + type_name, kind); if (idx >=3D 0) return idx; start_id =3D btf->start_id; @@ -1147,6 +1190,7 @@ static struct btf *btf_new(const void *data, __u32 si= ze, struct btf *base_btf, b err =3D err ?: btf_sanity_check(btf); if (err) goto done; + btf_check_sorted(btf); =20 done: if (err) { --=20 2.34.1