From nobody Wed Dec 17 11:01:14 2025 Received: from mail-il1-f201.google.com (mail-il1-f201.google.com [209.85.166.201]) (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 A3A4C1EE7BE for ; Tue, 10 Dec 2024 22:44:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733870680; cv=none; b=tmTpIyqfWTiMscNlnSOn6PUa9qufaqK9yNwkj1AV8SOj2AnITucOpwnIVf6WO4lXFrfcvPrsJpiIN1PFbEhgjJ0TmG/KrajiOYkD2i5wtG1xbndqAFdQGnl+LWK7QviPma4QwU5oXIeQE6tZOUPTSm9GUDItOELwgjyEV2AIR7Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733870680; c=relaxed/simple; bh=u9leJh1meIuUaI/1M+S+UmdCfL/JpflDsWChpBlbaQ0=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=lRByAkk8wKrXob+JLIKxhUdOadhGxFpFTIIYYLHUow1c0BNTZT1hijVCyC5NhkOw4eU46IKZ0UygLv1tan8OEsVYCeACSDGHgWDoBrs2N1JMw3y8HTXDM5VhO6bUw2oKICpL4f4MXoGMRy93hBqmp2U4Xnkv1QgCHm9VhurY7zk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--rananta.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=yekHXpLX; arc=none smtp.client-ip=209.85.166.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--rananta.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="yekHXpLX" Received: by mail-il1-f201.google.com with SMTP id e9e14a558f8ab-3a9d57cff85so43232305ab.2 for ; Tue, 10 Dec 2024 14:44:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1733870678; x=1734475478; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=qqk+CWWqN5rq/MGB/yHuis8ZQybMADaRH3hk0OV3uFc=; b=yekHXpLX+E2jJHHo8MvEQkcunPSy8qjbKcTNBtQErx6td5w0k5BQJOGkPiTDDYFT5Z b++cL5CA7hgHl5U0DnU6ENsvXL/iK5lptiXXFVmTJZhb+zvuK2fDMan4CdeEHZVyIwmA bnEddXaS7N0X+TbVbVv+Dh0hMTqJwRAEokdCznWiuI3Ly+XTKHPaQH8HtAXrjIAp7i2c uW6BqdBC7cHpacBsbziD3qZaEsu8+9q3zU7Z5pud8YYqe/frP49nh8UsVNFAtcPqRoZN qYanLMURSLIFIu6v2Fu0ex2Wf0BQzX9GpHUgfAxz1HCr37PbL64GbVOAO5oq+3c/wpmA 7k4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733870678; x=1734475478; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=qqk+CWWqN5rq/MGB/yHuis8ZQybMADaRH3hk0OV3uFc=; b=PPWJ6eYoCscw81qmdUB/DjsaWW1KEp2rGRIIntlplOiypO6Z2SsCcAUdcv9SCUcOUj /3pZXTmdGalrGh+LDBdjSn5yMaqJllHAUfxOFiDWiXGF+hmP7Q8OBT8kf4+RNxOikOdF r9nDAwU0vkQMuXjYTSiobbTHW+3CL44b9WUn2+hgI5qAAbH6k/rGufwjQR3xQ1JJe5w0 G107RBEMxNXCbDRX8XA/uzi78+nOvty3Jp2lj3XmLhxo9dOCXLvtBlPMzE2I7cx26/1p b+uugKqZKtzhmBikDq94EsjcJraasoUZThYRybMs//z3yaoTnhd2G6A9z7Kn0Gtyh0Gs GG5g== X-Forwarded-Encrypted: i=1; AJvYcCXZZgDQhonPMtQsLpNTPeL2+GQpOjpP/FIttiUVjyA+E6vziuFIgMUbZAvBt5RewJakpcgH6BsaqxPNXF0=@vger.kernel.org X-Gm-Message-State: AOJu0YwJVkA0LGEXb8GPHStAJvJSnt470QSAnpg1HTUXnImIoYdgsl09 PkwyzTbPJz86T6ZkDgA73tmqs8UXNe1jHqpi7UqjLB1Q5YSjA31wsBe6SGW2FfkfOe8ghBYKOJb 3KK53oQ== X-Google-Smtp-Source: AGHT+IET+QW/GxpL9rCtfukOBZmUY2qfXT9xKNqc21i3LI6O4efNul9iMc8xel/3eEjF4fnde26kqvcpA/Uu X-Received: from ilgm9.prod.google.com ([2002:a92:4b09:0:b0:3a7:cfdb:57d]) (user=rananta job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6e02:1384:b0:3a7:5cda:2769 with SMTP id e9e14a558f8ab-3aa06bee07cmr8003405ab.12.1733870677912; Tue, 10 Dec 2024 14:44:37 -0800 (PST) Date: Tue, 10 Dec 2024 22:44:35 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241210224435.15206-1-rananta@google.com> Subject: [PATCH] selftests/rseq: Fix rseq for cases without glibc support From: Raghavendra Rao Ananta To: Mathieu Desnoyers Cc: Raghavendra Rao Anata , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently the rseq constructor, rseq_init(), assumes that glibc always has the support for rseq symbols (__rseq_size for instance). However, glibc supports rseq from version 2.35 onwards. As a result, for the systems that run glibc less than 2.35, the global rseq_size remains initialized to -1U. When a thread then tries to register for rseq, get_rseq_min_alloc_size() would end up returning -1U, which is incorrect. Hence, initialize rseq_size for the cases where glibc doesn't have the support for rseq symbols. Cc: stable@vger.kernel.org Fixes: 73a4f5a704a2 ("selftests/rseq: Fix mm_cid test failure") Signed-off-by: Raghavendra Rao Ananta --- tools/testing/selftests/rseq/rseq.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/rseq/rseq.c b/tools/testing/selftests/= rseq/rseq.c index 5b9772cdf265..9eb5356f25fa 100644 --- a/tools/testing/selftests/rseq/rseq.c +++ b/tools/testing/selftests/rseq/rseq.c @@ -142,6 +142,16 @@ unsigned int get_rseq_kernel_feature_size(void) return ORIG_RSEQ_FEATURE_SIZE; } =20 +static void set_default_rseq_size(void) +{ + unsigned int rseq_kernel_feature_size =3D get_rseq_kernel_feature_size(); + + if (rseq_kernel_feature_size < ORIG_RSEQ_ALLOC_SIZE) + rseq_size =3D rseq_kernel_feature_size; + else + rseq_size =3D ORIG_RSEQ_ALLOC_SIZE; +} + int rseq_register_current_thread(void) { int rc; @@ -219,12 +229,7 @@ void rseq_init(void) fallthrough; case ORIG_RSEQ_ALLOC_SIZE: { - unsigned int rseq_kernel_feature_size =3D get_rseq_kernel_feature_size(= ); - - if (rseq_kernel_feature_size < ORIG_RSEQ_ALLOC_SIZE) - rseq_size =3D rseq_kernel_feature_size; - else - rseq_size =3D ORIG_RSEQ_ALLOC_SIZE; + set_default_rseq_size(); break; } default: @@ -239,8 +244,10 @@ void rseq_init(void) rseq_size =3D 0; return; } + rseq_offset =3D (void *)&__rseq_abi - rseq_thread_pointer(); rseq_flags =3D 0; + set_default_rseq_size(); } =20 static __attribute__((destructor)) base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37 --=20 2.47.0.338.g60cca15819-goog