From nobody Thu Dec 18 23:00:18 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D446E7D0A5 for ; Thu, 21 Sep 2023 18:37:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230310AbjIUSha (ORCPT ); Thu, 21 Sep 2023 14:37:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230098AbjIUSgs (ORCPT ); Thu, 21 Sep 2023 14:36:48 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2C40DB649 for ; Thu, 21 Sep 2023 11:32:39 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-59eea906b40so18811267b3.0 for ; Thu, 21 Sep 2023 11:32:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1695321158; x=1695925958; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=KBlJtLtsdI3hK0QdaI1JvF2kBovJQMFIeF0KITJB/xY=; b=nOPHjrqBIGpQvEbyjHLhjS5j3oSFzKWpRTNcXv3ZiTZ1QUn6QonySbCQLpW7zhr5cV 8hSf6ZQZoaw3bkIxeWhJpBzVvtdJ5XIEnqJDx9i6edYps8+9FgYx3cM7ZfwQQV6oo6nN +TbOf+P6/LCHwpAwxjbpvAzFFD8e9YFpK4ZkU1zXxLKYg6YToajfXo1DPzS0YeBBZfF/ +WPpNCcN5zZ96FrI7H8YCktWklcudsIv52xBup4Zs27ucI6cmf1q4QIcx3am0n2RvedR X73itWfmcZW8FkDxPgES7hO3rnlBSQLglRatZCLQfoZcfQLZOfX+iOhGArxc9j80PmcC q4IA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695321158; x=1695925958; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=KBlJtLtsdI3hK0QdaI1JvF2kBovJQMFIeF0KITJB/xY=; b=YrIg83NqjqOWRqFXyhQA767Ruo/nE32HEE7MyMMGTVSKkyM9Rr7p9AEccCPXZ9A4PX NGHoauhDkFMCkX68pkjcJhX6R/6XL4mHSw/lRFWUaiV7eZcSfpMfDNnKzW1oD9/2DV/I Oo+1rGpizm/MNmI2hYeHxuV/8w3DlOdHa/VFQvx4Adfim861sciKqGJihNgmboC7iw9h shfEcPm00OnpsgqJUgA4zSXILCbYY6sM/7/9aVoVXEsA/SCJcR+ba+cr99sbl9wd66YF iX124s6bZZKeAIsH3wvx27+5uwcmYQLazr0KTIDdbYmU50uXCEIrasoHcp6kEoUUTlop joSg== X-Gm-Message-State: AOJu0Yx97i+qV5Hz4HlWQV2icnw4YlilKJaWsk1gGx86xRU/bAbsNUBB QvdwstRQUnpq2Fttmxmn7HVaY6Pg6P5xWtAqIA== X-Google-Smtp-Source: AGHT+IHI098EEpqO6htZ6MTc85xWWh3YpKsnqENPUYf7F/xvLGI92lITJbHV0USw1ADPIZbp1s0JkljinpuKkIaDuQ== X-Received: from jstitt-linux1.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:23b5]) (user=justinstitt job=sendgmr) by 2002:a25:4082:0:b0:d80:1391:1f1 with SMTP id n124-20020a254082000000b00d80139101f1mr63208yba.1.1695272040719; Wed, 20 Sep 2023 21:54:00 -0700 (PDT) Date: Thu, 21 Sep 2023 04:54:00 +0000 Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAGfMC2UC/x2NSwqEMBAFryK9tsEkw4BeRVzk05nphVG6RRTx7 gZ3VbV47wIlYVIYmguEdlZeShXTNhD/vvwIOVUH21nX9dagblLiemIS3kkUmRf0KdY+O/tSRBN y777+k3MIUJdWoczH+zJO9/0A10IdAXUAAAA= X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1695272040; l=2097; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=wxLohCJ8OZyT4ckFvNL/ySlACAagL4RRycYgRdRDcQE=; b=FJozEDATUZfUMAdvAUx5oyW6ZiVUThemIA/jnMSx8yNUj5AxeA4RjStYDSxol7J7+D4rXF5CQ KDXN5IlUqusC1qJ5YHBdUIOWRiGU0IIeYHvhB5gxVpdkMBQYmxwb0L3 X-Mailer: b4 0.12.3 Message-ID: <20230921-strncpy-drivers-iio-adc-stm32-adc-c-v1-1-c50eca098597@google.com> Subject: [PATCH] iio: adc: stm32-adc: replace deprecated strncpy From: Justin Stitt To: Jonathan Cameron , Lars-Peter Clausen , Maxime Coquelin , Alexandre Torgue Cc: linux-iio@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Content-Type: text/plain; charset="utf-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable `strncpy` is deprecated for use on NUL-terminated destination strings [1]. We should prefer more robust and less ambiguous string interfaces. We expect adc->chan_name[val] to be NUL-terminated based on ch_name's use within functions that expect NUL-terminated strings like strncmp and printf-likes: | if (!strncmp(stm32_adc_ic[i].name, ch_name, STM32_ADC_CH_SZ)) { | /* Check internal channel availability */ | switch (i) { | case STM32_ADC_INT_CH_VDDCORE: | if (!adc->cfg->regs->or_vddcore.reg) | dev_warn(&indio_dev->dev, | "%s channel not available\n", ch_name); ... There is no evidence that NUL-padding is needed either. Considering the above, a suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. If, for any reason, NUL-padding _is_ required we should go for `strscpy_pad`. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncp= y-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.htm= l [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- Note: build-tested --- drivers/iio/adc/stm32-adc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index f7613efb870d..9cdcf396d901 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -2209,7 +2209,7 @@ static int stm32_adc_generic_chan_init(struct iio_dev= *indio_dev, ret =3D -EINVAL; goto err; } - strncpy(adc->chan_name[val], name, STM32_ADC_CH_SZ); + strscpy(adc->chan_name[val], name, STM32_ADC_CH_SZ); ret =3D stm32_adc_populate_int_ch(indio_dev, name, val); if (ret =3D=3D -ENOENT) continue; --- base-commit: 2cf0f715623872823a72e451243bbf555d10d032 change-id: 20230921-strncpy-drivers-iio-adc-stm32-adc-c-1bf936a4ffbb Best regards, -- Justin Stitt