From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 88C311891A9; Sun, 22 Feb 2026 14:21:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771770079; cv=none; b=FJschgLqYBDRI0kyDY9tyVODbMpBlQYCoi4v9F1ViUewQRuqLGzU2rpiEA9gN2aDvljyhSiUFqY2D8VLLitUdu2T9oiMNBIb2i9LQxw46KaR/QEtLKXKdc6rIE7/SG3QEYn3qErOdOXFLfH1kACjGOCjHtsMGggNYPF06CUaNYg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771770079; c=relaxed/simple; bh=MZx+NJBG9GYPs79COSdZaD+MCMhkJPIJL4OlAsjT/UU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Vi5Jwl+rYlzINtu/uyIsBEpThcvt3A3TeEpFhXUyzfAHU3qk4lo9BpfsIyIKJsCIXPU8K8jFS82ibmCMa6rmVZWC+yIafTO90HB9JKMXOFmKqGTcIlSqdntY+gR2Bo/B9tA3QnKq2698pRB+F1urVrlqTRh/hMNzVoiRNmn56SY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=j5u6ywZ+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="j5u6ywZ+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DCDEC116D0; Sun, 22 Feb 2026 14:21:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771770079; bh=MZx+NJBG9GYPs79COSdZaD+MCMhkJPIJL4OlAsjT/UU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j5u6ywZ+KOkNd5PVtpiIoFDo2Ja8qS/tr32diYnqcotkZ6jm3Sw2zDQoM0kpsGm2E dld/k8e7/5SQkJWJisV0E0BrF/RiUs+wCLhCVEuetnh2aP8prV4eai3Fy1esnDbfvL 2QO4SHcxA+K7TVDAt9484nQDjgB4NskZQdjimh9uvi2ZCJr4tm+O+ATXJcEjkKK9+N JwVcKThBgYYo7r3/rB7VKfVIUkgnuv/P3mkBQTmU3QnCgTGOkv5vxT+ZpvSaHDB/+s 3DJ5KyH3t/F5VmZneKniaEmcSFrKTeGDl0onDCbEAWb3vTcZkPDX2Ny19kKFOkAHII l0QTOou7ozvVQ== From: "Rafael J. Wysocki" To: Linux ACPI Cc: Alexandre Belloni , Danilo Krummrich , LKML Subject: [PATCH v0 3/6] ACPI: TAD: Update RT data validation checking Date: Sun, 22 Feb 2026 15:17:02 +0100 Message-ID: <3044192.e9J7NaK4W3@rafael.j.wysocki> Organization: Linux Kernel Development In-Reply-To: <4727679.LvFx2qVVIh@rafael.j.wysocki> References: <4727679.LvFx2qVVIh@rafael.j.wysocki> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" From: Rafael J. Wysocki Move RT data validation checks from acpi_tad_set_real_time() to a separate function called acpi_tad_rt_is_invalid() and use it also in acpi_tad_get_real_time() to validate data coming from the platform firmware. Also make acpi_tad_set_real_time() return -EINVAL when the RT data passed to it is invalid (instead of -ERANGE which is somewhat confusing) and introduce ACPI_TAD_TZ_UNSPEC to represent the "unspecified timezone" value. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpi_tad.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) --- a/drivers/acpi/acpi_tad.c +++ b/drivers/acpi/acpi_tad.c @@ -49,6 +49,9 @@ MODULE_AUTHOR("Rafael J. Wysocki"); /* Special value for disabled timer or expired timer wake policy. */ #define ACPI_TAD_WAKE_DISABLED (~(u32)0) +/* ACPI TAD RTC */ +#define ACPI_TAD_TZ_UNSPEC 2047 + struct acpi_tad_driver_data { u32 capabilities; }; @@ -67,6 +70,16 @@ struct acpi_tad_rt { u8 padding[3]; /* must be 0 */ } __packed; +static bool acpi_tad_rt_is_invalid(struct acpi_tad_rt *rt) +{ + return rt->year < 1900 || rt->year > 9999 || + rt->month < 1 || rt->month > 12 || + rt->hour > 23 || rt->minute > 59 || rt->second > 59 || + rt->tz < -1440 || + (rt->tz > 1440 && rt->tz != ACPI_TAD_TZ_UNSPEC) || + rt->daylight > 3; +} + static int acpi_tad_set_real_time(struct device *dev, struct acpi_tad_rt *rt) { acpi_handle handle = ACPI_HANDLE(dev); @@ -80,12 +93,8 @@ static int acpi_tad_set_real_time(struct unsigned long long retval; acpi_status status; - if (rt->year < 1900 || rt->year > 9999 || - rt->month < 1 || rt->month > 12 || - rt->hour > 23 || rt->minute > 59 || rt->second > 59 || - rt->tz < -1440 || (rt->tz > 1440 && rt->tz != 2047) || - rt->daylight > 3) - return -ERANGE; + if (acpi_tad_rt_is_invalid(rt)) + return -EINVAL; args[0].buffer.pointer = (u8 *)rt; args[0].buffer.length = sizeof(*rt); @@ -145,6 +154,9 @@ static int acpi_tad_get_real_time(struct if (ret) return ret; + if (acpi_tad_rt_is_invalid(rt)) + return -ENODATA; + return 0; }