From nobody Sun Oct 5 10:47:06 2025 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (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 B85111A23BB for ; Tue, 5 Aug 2025 16:21:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754410919; cv=none; b=R5oikDpfMODag0WtnNItP4svzTbIw88jin4ou8f3y58l0irSzntrOlM65ONi5Sj2R1GBUnqDEe26gc3l3iTzALcz7S9XsEFK6GZihD6lhG4O0z7I9ZkKlX93hPo4ipu+IqKRMTKoxaKCrC+wt+8gV2VNgM4+2q2KFjv38xFGSyw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754410919; c=relaxed/simple; bh=b2dhbaF/pk/NFPcdxLdEyKbE+xfcHsMrSQj7Hev2whc=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=hYP/C7Mw9KrT59C2MUZxL4Kcj1kFsfZ6yUsEMwLe2LFmCmen7SL2VGBtKltdRP4k0YZVRoklOey84cujbSamRgMnKHOilRSzsZzlq2dsAfC7uWv5z9jYSNXMDOaERFCGBDRArwOpWw8ZabYj4v19SL686C2wpGf0ZQ68uASjlLo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--wakel.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=nc5M2gkK; arc=none smtp.client-ip=209.85.210.202 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--wakel.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="nc5M2gkK" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-76bb73b63d2so5532104b3a.1 for ; Tue, 05 Aug 2025 09:21:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1754410917; x=1755015717; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=36rRNVwGvNB+pofkD3n2pIQi/fX7BoFaKjjYFA4l3XQ=; b=nc5M2gkKcABCotNaga0bPyrrqqD/HUMaGAmaFkFINWj5umLoEa2qrtd2XAAH2zr18t tHSfoLJnyfcHryyQiVN2yjyGdjQG02t0Eg/rsP8jMkTHg+AKKf3oGNmFUHs9u5k0wNJ7 WgjorgJDnezchEzPl1cX01xY2oqYjzKSs0k/i4Dmshnex/hgnJd8dnyFjS5N50HOMOwB oo+h7HBNmtq8Ih1LxJThXITOv0YHeucx60pIDp3hVX1FUr15Pnd+H3/V9QcF2OAz49Cp /FeVCROvXLEKx03jKc6cXbB9b0QAw3o85ObALgETuCLavS/BFJhZA80G9pOr3LxRwWDe B/Ow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754410917; x=1755015717; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=36rRNVwGvNB+pofkD3n2pIQi/fX7BoFaKjjYFA4l3XQ=; b=eCCJF8ZMEwh93euq83cT/hrX8IyDxi88G4qQgv07yIHBjH1RcqWzoIRHhWfNg5Ij05 wZZdc2+lFPZB/DVt/1V/DpM+UvsoYLj8beNYFsxbZO5+Gr9Gs1pqDWd14qaj+Ns8IWNz 82zJrnice3GFWn7acfs3Dwb4p6IQiHJ9INCaYtbXsSxpmRMZ+9t8QThJT39rjqv6LIm0 Wjn09sn/NmbP2fuDqvum/ILV97q3wtPeezWVL7hOtRL6uGOLgusErb0tcLB26Pt73BUW 9zPOc1eTmtk6yPRDS5q3lnKxUViUUJC2uZghg2d2P2mzDR3vTBtAj3L3PJkbMzzV3lFt GKyw== X-Gm-Message-State: AOJu0Yylh6h3LBatsTehnWfQPimutlBNwwSwNm0zXLxEi8kjb1jP5Dn+ eLIpoRal5AUWepuq5d+61v7A+Bof2UVKLcwmV2GMC9KrRwv7kibz0r7pS9VGeBf6UTujLdFNaEf NqA== X-Google-Smtp-Source: AGHT+IH5QrhATp0WCD7uvxonfSLxedpAQyiufvtJEilNswrIwiqKRnjZHsZ8Nh4aaH+sfHB7nbmi5JmkrA== X-Received: from pfbmc8.prod.google.com ([2002:a05:6a00:7688:b0:76b:c7ca:49ed]) (user=wakel job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:939e:b0:240:50d:4285 with SMTP id adf61e73a8af0-240050d4b8cmr14866691637.38.1754410917060; Tue, 05 Aug 2025 09:21:57 -0700 (PDT) Date: Wed, 6 Aug 2025 00:21:53 +0800 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 2.50.1.565.gc32cd1483b-goog Message-ID: <20250805162153.952693-1-wakel@google.com> Subject: [PATCH] vdso: Define NSEC_PER_SEC as 64-bit to prevent overflow From: Wake Liu To: Andy Lutomirski , Thomas Gleixner , Vincenzo Frascino Cc: linux-kernel@vger.kernel.org, wakel@google.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The constant NSEC_PER_SEC (1,000,000,000) is defined as a long literal. On 32-bit systems like arm32, where long is 32 bits, this value can overflow when used in 64-bit calculations. This can lead to incorrect time calculations within the VDSO. To fix this, define NSEC_PER_SEC as a long long literal (1000000000LL), ensuring it is treated as a 64-bit value on all architectures and preventing potential overflows. Signed-off-by: Wake Liu --- include/vdso/time64.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/vdso/time64.h b/include/vdso/time64.h index b40cfa2aa33c..07641b27d139 100644 --- a/include/vdso/time64.h +++ b/include/vdso/time64.h @@ -8,7 +8,7 @@ #define NSEC_PER_USEC 1000L #define NSEC_PER_MSEC 1000000L #define USEC_PER_SEC 1000000L -#define NSEC_PER_SEC 1000000000L +#define NSEC_PER_SEC 1000000000LL #define PSEC_PER_SEC 1000000000000LL #define FSEC_PER_SEC 1000000000000000LL =20 --=20 2.50.1.565.gc32cd1483b-goog