From patchwork Fri Sep 20 07:49:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Ambardar X-Patchwork-Id: 13808209 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (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 185874F218; Fri, 20 Sep 2024 07:49:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726818581; cv=none; b=oi9oWwTeEYvKJY0hv1B2X9vrklxUyR7KctZ8TnyNWzd8HULG9PkwEKhqWKrlUbkcBhk+/2XlQvXWMatrNvfqPNnc1GIHymmR9a6V1MWwxiSdze1SYkPD3LOYcdYeR9l1cwMgnzldbnHtHLjgSDPKJetvvaQzVCroo+Hmm7LP8N8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726818581; c=relaxed/simple; bh=E5TyztQhkUzZwMxV++0nI5EoQonMvNCb2Tdg38mkhYk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=CFdb3kRd+Cq77/tZhADALb1rtCVY9cWwL1nVDo6kJbdFr++AbQV2xvk+CWdNmeHjjXQy4nYH9+3pEmVM6l0HLmcv4GYTjiV73fSqBMOJSvTrDxdKT/b11XpbKHZBPjy9qZbvwp4RIhqSiH9sk5fyiJJGEUtXmYtyOUncX7Ss6p8= 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=kAQ9NI6X; arc=none smtp.client-ip=209.85.214.182 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="kAQ9NI6X" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-2055a3f80a4so12167685ad.2; Fri, 20 Sep 2024 00:49:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1726818579; x=1727423379; 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=noFg1mq/xrw7o2KWB3ZfepYrijjvn8fHawORzc/mm6c=; b=kAQ9NI6X1KbOfCVt02ADc9XAlpvWObHXDWK1qI80PY+DxVBBy/y3w673lrT32r94z8 o9stwZtnnFLSoPZ/JdbpnNvmZgPl3MEO/GIxVXhDOQKaxGVFvVpimBdzdv36FNFYJW/e kQEFfU+plrE37XOyEk5Jms/9NaN8Q1BiRIvzgisD0iI/hqK1U7uIL7VYpd2IAQ5B3Ylc Q28w2jinVMD0N/p8Km9HM56mqOhvCYRNiKzn3jkjt1F32bLkQl9tkyEEy2n/hz5F3EuQ rgENrT8iwgInRHhlUEefvlszL6lSTxW3+Ku5tEwdCweLHDtSvvk7tInaRKjYYP3LULu8 +mqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726818579; x=1727423379; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=noFg1mq/xrw7o2KWB3ZfepYrijjvn8fHawORzc/mm6c=; b=pLxt4GfAAF5rAgJhiXaN2XUasGnijHF2VIgLsxUTWLCDme199b9pHzkgLc/JskwehE 9B4UK2YD5XaLugmQmynbbeJn7gjfEtY2r8MdvhtFsUDiJG5gTvpKYU0V4kUduWvnuPHH rHp010zonKwAwup4ThBN6/rZe209sljNh/Pqhnvwe9uqDX4QXTYnxNPiVNPTGk4PYBj7 fRXwbLhwkOKC+VDJBhvT5LUWq+xJH2JXRf4vOmMgYgP7PnouSCOCjOaMMS9G4WTprxPN xD2R4lL4YgNIhWxthzi1AhQcpXyhM4ffV/ezNmCyqBLdXCzwWkVf68+aAke4tYGqZuSg gKrg== X-Forwarded-Encrypted: i=1; AJvYcCWZ4HCSsjAlEYQHuDuwiPhWfHRV5lzEMo9+PKYFM+IfpbckY3xRE45fttJbOV+PXLDEoHAO4l9E6+VdmLsxWqo=@vger.kernel.org X-Gm-Message-State: AOJu0YzoJBIKp88ITtyOSx4n8DDYlLW7bWJ6CvZD3zU2U1iLTnrHs5/n dDNGrJ0ysYo3dEGWDcMnXR4sDinaCfS5YIUlSFnZn4zVZHwsQV0AHMpXXg== X-Google-Smtp-Source: AGHT+IGJCPJ129JgNLt8JKJ4cnLDrd+a6uNiFccng6gWpt6GReTy81+QgyBIrdEUlkJwBxYTq4Wzgw== X-Received: by 2002:a17:903:41d2:b0:206:d69d:9ca6 with SMTP id d9443c01a7336-208d97f32dfmr18860205ad.10.1726818579097; Fri, 20 Sep 2024 00:49:39 -0700 (PDT) Received: from localhost.localdomain (69-172-146-21.cable.teksavvy.com. [69.172.146.21]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20794600fe8sm90481625ad.68.2024.09.20.00.49.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Sep 2024 00:49:38 -0700 (PDT) From: Tony Ambardar To: bpf@vger.kernel.org Cc: Tony Ambardar , linux-kselftest@vger.kernel.org, Andrii Nakryiko , Eduard Zingerman , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan , Jean-Philippe Brucker , Viktor Malik Subject: [PATCH bpf-next v1 2/3] bpf: btf: Ensure natural alignment of .BTF_ids section Date: Fri, 20 Sep 2024 00:49:12 -0700 Message-Id: <714d7ab8a48172c67ddc027c85b2a0dad0312a74.1726806756.git.tony.ambardar@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 While building of vmlinux employs a linker script to align the .BTF_ids section to 4 bytes, other usage leaves .BTF_ids unaligned and may lead to problems (e.g. [1]). Post-processing and libelf-based endian translation by resolve_btfids may also potentially suffer from misalignment. Update encoding macros in btf_ids.h to always align BTF ID data to 4 bytes. [1]: 3effc06a4dde ("selftests/bpf: Fix alignment of .BTF_ids") Signed-off-by: Tony Ambardar --- include/linux/btf_ids.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h index c0e3e1426a82..c10b163dc340 100644 --- a/include/linux/btf_ids.h +++ b/include/linux/btf_ids.h @@ -89,6 +89,7 @@ word \ #define __BTF_ID_LIST(name, scope) \ asm( \ ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ +".balign 4, 0; \n" \ "." #scope " " #name "; \n" \ #name ":; \n" \ ".popsection; \n");