From nobody Thu Dec 18 04:30:32 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 C3539CDB47E for ; Fri, 13 Oct 2023 20:34:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232109AbjJMUdw (ORCPT ); Fri, 13 Oct 2023 16:33:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231468AbjJMUdu (ORCPT ); Fri, 13 Oct 2023 16:33:50 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6856D83 for ; Fri, 13 Oct 2023 13:33:49 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-5a7ac9c1522so39508927b3.0 for ; Fri, 13 Oct 2023 13:33:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1697229228; x=1697834028; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=eG6A8LXGdf5DishXidGUjCut3MBs3ddn444r7C+ElXE=; b=2GLPtszDPum7mvEFFd7ZG16lA3MmeTdMHTlFft9GmpFMwSsT9ZZKIfhGdlCfmHi2FX ZjuZMfsxXLbPvhhi9NdsObNaE1pZl3cT2P3AACBXiPkjpHetoMx+yFIlOBfPq0rHmE6m Q0bEOF9BoBUd4FAmDDRMlCIMmHn93EOhLLtbGVCIlJbTXnOpPFNOX+wWDSXZD2xMsZbt gsa7AgLr/5atERjPTKUu+h1H4OB6LMzbK19DxVYEST6XziN3W2B36hLiSY/N83IIXsYp eS6l0gdaGQtgaooXyrDGtquM0gA2prIzokC3X/Xu7upj5Q96JW1+ZiHNPIs8Hol87akv 4exw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697229228; x=1697834028; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=eG6A8LXGdf5DishXidGUjCut3MBs3ddn444r7C+ElXE=; b=Ibto03Sl/BX45rviClaaxcynW/dgiApZxv62kf+hS849UyWRaHcQh/T/qZnvZis65+ DNXh1JpMWbqd2yJNlMDRHzpihsSeBO3m34Sh25WYTn/d0gn09VLGEPWgWVzpkZoW95rr WlSmi6V+ow3ztRbg55njSavORrcLPlmy2c5p+HDKFLgFKDcGLQ06X7gBDEO8/1Whz0+9 Vx67uUhf/0vSpBlgyLNG/qqD7WIwPQIU6124fyMmfInuJJG+1NO4WFABnT7GxQAWpiPx WSJtQYfeO1JMIl9ZTyV/HN4CJ2ktfvXMO0o4ybL8BPDYAJDuZ5Cl0kzLqlRjFMTz2OTN fRxg== X-Gm-Message-State: AOJu0Yw3zDCjRpqs28tCpMAoLs/a4+f6kcpAtyRByxXo0QTEeDKJu16Q D001kYWlfH4dq7/Cnz8M8mPha7uVU8/mGtiMAw== X-Google-Smtp-Source: AGHT+IE1DLGODvnUeOyBO95DQWbeWAG3EQH/FQzqvAHpAtiVubf5eiiRi9rEMF1X30r6/tRVippKDNEtWmsLOAHylw== X-Received: from jstitt-linux1.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:23b5]) (user=justinstitt job=sendgmr) by 2002:a25:5056:0:b0:d9a:3dac:6c1a with SMTP id e83-20020a255056000000b00d9a3dac6c1amr284177ybb.11.1697229228652; Fri, 13 Oct 2023 13:33:48 -0700 (PDT) Date: Fri, 13 Oct 2023 20:33:48 +0000 Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAKupKWUC/x2NQQrCMBBFr1Jm7UDS0AheRVyE9GsHNZaZ0Cqld zfK4y/e5r+NDCowOnUbKRYxeZUm/tBRnlK5gWVsTr3rg3c+sFUtef7wqLJAjQsqr6J4wIxTnX7 z7s7PlLlxDGkYYoyIidrnrLjK+987X/b9C0V4zo5/AAAA X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1697229227; l=2804; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=bIMAUwS6tKmB9c3Rk81R/5V5UUFo1cBwPXaV7yFWMoA=; b=CMqSCYBAwjGQ8NqCJLEe3oWu/b2U+C4UYTWSlc/PUeeYHnfx5MQOccK4vtSKlHLLgk37gUzWa wuqPSkQzuGcBq8W/yBQzKG3d3WsDrMe0sr4hx8u6ZKodNLkDgwsgk/2 X-Mailer: b4 0.12.3 Message-ID: <20231013-strncpy-drivers-net-wireless-ath-ath10k-mac-c-v1-1-24e40201afa3@google.com> Subject: [PATCH] ath10k: replace deprecated strncpy with strtomem_pad From: Justin Stitt To: Kalle Valo , Jeff Johnson Cc: ath10k@lists.infradead.org, linux-wireless@vger.kernel.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 [1] and we should prefer less ambiguous interfaces. In this case, arvif->u.ap.ssid has its length maintained by arvif->u.ap.ssid_len which indicates it may not need to be NUL-terminated, although by virtue of using strtomem_pad (with NUL-byte pad character) and having a destination size larger than the source, ssid will, incidentally, be NUL-terminated here. As strtomem_pad() docs say: * @dest: Pointer of destination character array (marked as __nonstring) * @src: Pointer to NUL-terminated string * @pad: Padding character to fill any remaining bytes of @dest after copy * * This is a replacement for strncpy() uses where the destination is not * a NUL-terminated string, but with bounds checking on the source size, and * an explicit padding character. If padding is not required, use strtomem(= ). Let's also mark ath10k_vif.u.ap.ssid as __nonstring. It is unclear to me whether padding is strictly necessary. Perhaps we should opt for just strtomem() -- padding certainly doesn't hurt, though. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncp= y-on-nul-terminated-strings [1] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Acked-by: Jeff Johnson Reviewed-by: Kees Cook --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/net/wireless/ath/ath10k/core.h | 2 +- drivers/net/wireless/ath/ath10k/mac.c | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/= ath/ath10k/core.h index 4b5239de4018..ba9795a8378a 100644 --- a/drivers/net/wireless/ath/ath10k/core.h +++ b/drivers/net/wireless/ath/ath10k/core.h @@ -607,7 +607,7 @@ struct ath10k_vif { u8 tim_bitmap[64]; u8 tim_len; u32 ssid_len; - u8 ssid[IEEE80211_MAX_SSID_LEN]; + u8 ssid[IEEE80211_MAX_SSID_LEN] __nonstring; bool hidden_ssid; /* P2P_IE with NoA attribute for P2P_GO case */ u32 noa_len; diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/a= th/ath10k/mac.c index 03e7bc5b6c0b..7daa007bd8b3 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -6125,8 +6125,7 @@ static void ath10k_bss_info_changed(struct ieee80211_= hw *hw, =20 if (ieee80211_vif_is_mesh(vif)) { /* mesh doesn't use SSID but firmware needs it */ - strncpy(arvif->u.ap.ssid, "mesh", - sizeof(arvif->u.ap.ssid)); + strtomem_pad(arvif->u.ap.ssid, "mesh", '\0'); arvif->u.ap.ssid_len =3D 4; } } --- base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2 change-id: 20231013-strncpy-drivers-net-wireless-ath-ath10k-mac-c-c73a55666= e6a Best regards, -- Justin Stitt