From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) (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 822F845C6E5 for ; Tue, 15 Sep 2026 08:30:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789461008; cv=none; b=kqM/dvQsAoLFalhE0YKsVgdndfIVF/N3Y7ItsOQwzoSSTGT4Ky8MUtiiuecak9dSL3fEgZvfQav1iyQjXAHEoa9L5cSpgCiKJWmr1Qv4Bo8AsZbS8YbJZJJERk8TnhAp1zxL8zT2EDF2RJGH6u8AV9Rhp9fJbjIM+1qknAJHTnk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789461008; c=relaxed/simple; bh=fIMzPvcr9X2eD4+Ac+cNHBPnvQriFstqx8IX88uxT8g=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=uTFZ0eQwbLEhrldD0cuBzK/a0PzQk2ISgCgfw22BOSrycyRAHDjOCP4E66q2KHXqKuH8akrNndyg8ehR6tcfngkWkI/CWL7uU+9c4QX+desr+PtJt3a9aTZelE15WBTzd4DZM5oQt99Hth9/Iwc8tqgB8bAoPP1XCm58WRRy0uc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--morbo.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=v2xXayXC; arc=none smtp.client-ip=209.85.160.197 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--morbo.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="v2xXayXC" Received: by mail-qt1-f197.google.com with SMTP id d75a77b69052e-530d912b923so78713511cf.2 for ; Tue, 15 Sep 2026 01:30:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1789461003; x=1790065803; darn=vger.kernel.org; h=content-transfer-encoding:content-type:cc:to:from:subject :message-id:references:mime-version:in-reply-to:date:from:to:cc :subject:date:message-id:reply-to:content-type; bh=uYw3XH3TVDlWH5yZkMBbor+NJ9bN2wpB4N7ncSus1u4=; b=v2xXayXCBjd86ih/bXx2xzIdcfHLHUSciE/XCdE9LgmQ7Y5Z30Qvfn/RXgYzub49UH X4CHcMCDSEt0B3RAr32wd6stXpCZRLQcyaaulBOlrl25QXc+PyyS7YKcmW/+vZ0b8TXF /z7XGQXJ5yfWPmVzSvlhBBd6f3af4tCZimeA9bDSlJzFrtPFvO9r2gIGEPOapPsUR9Aa VhvI2nyC98pl/6xaUQGc50/2MhtlvTZ+2UF/oVJtuzW3H02vAhr7dc3Bq/paJmRZm0b0 5Mc07/Hm3SqhcHJTsq2sLMhDrMB7NkG+AqIX7xrLf9oVOvIAVe+IP/SRe9T3CbOGvIWV oPPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789461003; x=1790065803; h=content-transfer-encoding:content-type:cc:to:from:subject :message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=uYw3XH3TVDlWH5yZkMBbor+NJ9bN2wpB4N7ncSus1u4=; b=swSgdKPkOQbVlJEyGWKBxRrB0+CxbGPaBVtP6BcrEpjUN9PuKixibvKX4q2ngUTeWB 6YC04bH4CKTjZNEgPO+p2vfZqDYsRfrCjY1qivZXY/jhyiuSdKOOahHH0bTN7CWpw765 P9tcFjSHSI4GRgBbMQITY2E0KzAC3CbG4NTZ4XR3F4oykMeORfmsiEcnMoGvesyVKGUo SmHlbmzwXlSozfJ0STzzH7bEYdb1447tgS/FAnkPkKnRr5m/EwMcWPUqAZI+Up+47Xpa +GPu8X74KI8TJUkdKguxMLSgZ27Hk7/x37dEMBxXje+ZICRrKt3fzjH+pVI1bmY01pdW qjcQ== X-Forwarded-Encrypted: i=1; AKwUvBxG8HZRPag+SIFpgLmeEPHEpGfyyDggDztwwm+ZgPctuPvssDAzFnv9epnHsYP/N6Uz3EJCEYoktx6EgCSPhOF/OA==@vger.kernel.org X-Gm-Message-State: AFuF++nRppfRqc0oYgAw1BEbjFPnTu3I/EPDPzT0ZkS7/HZ7hZQ4G1dZ FR7r24QjaNtndiYS5ubDdFESTroD7tYbqia3zZfjZlX8ygFN/88YeNvVWGBW1SQMxEvXJD3+yUz 5 X-Received: from pgap5.prod.google.com ([2002:a63:4205:0:b0:cc4:33fd:a4f7]) (user=morbo job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:6d8a:b0:3db:3e1c:8585 with SMTP id adf61e73a8af0-3db4063b18fmr14587917637.27.1789460412692; Tue, 15 Sep 2026 01:20:12 -0700 (PDT) Date: Tue, 15 Sep 2026 08:18:38 +0000 In-Reply-To: <20260915081910.4142719-1-morbo@google.com> Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260915081910.4142719-1-morbo@google.com> X-Mailer: git-send-email 2.55.0.1032.g73a4cd73de-goog Message-ID: <20260915081910.4142719-22-morbo@google.com> Subject: [PATCH 21/28] NFS: nfsroot: Refactor root_nfs_cat() to use snprintf() From: Bill Wendling To: linux-kernel@vger.kernel.org Cc: Bill Wendling , codemender-patching+linux@google.com, Russell King , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Ian Abbott , H Hartley Sweeten , Tony Luck , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matthew Brost , "=?UTF-8?q?Thomas=20Hellstr=C3=B6m?=" , Rodrigo Vivi , Dmitry Torokhov , Matthias Schwarzott , Mauro Carvalho Chehab , Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Arend van Spriel , Rob Herring , Saravana Kannan , Krzysztof Kozlowski , Sylwester Nawrocki , Peter Griffin , Alim Akhtar , Linus Walleij , Anil Gurumurthy , Sudarsana Kalluru , "Martin K. Petersen" , Trond Myklebust , Anna Schumaker , Mike Marshall , Martin Brandenburg , Kees Cook , Jiri Pirko , Simon Horman , Chuck Lever , Jeff Layton , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Jaroslav Kysela , Takashi Iwai , Andrew Morton , "Mike Rapoport (Microsoft)" , Kanglong Wang , Tiezhu Yang , Qiang Ma , Randy Dunlap , Pengpeng Hou , Ard Biesheuvel , Breno Leitao , Thorsten Blum , Harshit Mogalapalli , Greg Kroah-Hartman , Lyude Paul , Ashutosh Desai , Imre Deak , Dmitry Baryshkov , Johan Hovold , Johannes Berg , Miri Korenblit , Alexander Stein , Cryolitia PukNgae , Jiaming Zhang , Will Porter , Cen Zhang , "=?UTF-8?q?C=C3=A1ssio=20Gabriel?=" , Rong Zhang , Arun Raghavan , linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-edac@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-gpio@vger.kernel.org, linux-scsi@vger.kernel.org, linux-nfs@vger.kernel.org, devel@lists.orangefs.org, linux-hardening@vger.kernel.org, linux-sound@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable root_nfs_cat() computes the length of "dest" with strlen(), but then uses up to two strlcat() calls to append a comma separator and "src", rescanning "dest" each time. In preparation for removing the deprecated strlcat() API[1], use the already-computed length and a single snprintf() call to append the optional comma and "src", returning -1 if the result is truncated. Link: https://github.com/KSPP/linux/issues/370 [1] Cc: codemender-patching+linux@google.com Assisted-by: CoPilot:Claude-3.5-Sonnet [editor_update_file, make_kernel_bui= ld_single_file] Signed-off-by: Bill Wendling --- Cc: Russell King Cc: Huacai Chen Cc: WANG Xuerui Cc: Thomas Bogendoerfer Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: Ian Abbott Cc: H Hartley Sweeten Cc: Tony Luck Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: David Airlie Cc: Simona Vetter Cc: Matthew Brost Cc: "Thomas Hellstr=C3=B6m" Cc: Rodrigo Vivi Cc: Dmitry Torokhov Cc: Matthias Schwarzott Cc: Mauro Carvalho Chehab Cc: Tony Nguyen Cc: Przemek Kitszel Cc: Andrew Lunn Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Arend van Spriel Cc: Rob Herring Cc: Saravana Kannan Cc: Krzysztof Kozlowski Cc: Sylwester Nawrocki Cc: Peter Griffin Cc: Alim Akhtar Cc: Linus Walleij Cc: Anil Gurumurthy Cc: Sudarsana Kalluru Cc: "Martin K. Petersen" Cc: Trond Myklebust Cc: Anna Schumaker Cc: Mike Marshall Cc: Martin Brandenburg Cc: Kees Cook Cc: Jiri Pirko Cc: Simon Horman Cc: Chuck Lever Cc: Jeff Layton Cc: NeilBrown Cc: Olga Kornievskaia Cc: Dai Ngo Cc: Tom Talpey Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Bill Wendling Cc: Andrew Morton Cc: "Mike Rapoport (Microsoft)" Cc: Kanglong Wang Cc: Tiezhu Yang Cc: Qiang Ma Cc: Randy Dunlap Cc: Pengpeng Hou Cc: Ard Biesheuvel Cc: Breno Leitao Cc: Thorsten Blum Cc: Harshit Mogalapalli Cc: Greg Kroah-Hartman Cc: Lyude Paul Cc: Ashutosh Desai Cc: Imre Deak Cc: Dmitry Baryshkov Cc: Johan Hovold Cc: Johannes Berg Cc: Miri Korenblit Cc: Alexander Stein Cc: Cryolitia PukNgae Cc: Jiaming Zhang Cc: Will Porter Cc: Cen Zhang Cc: "C=C3=A1ssio Gabriel" Cc: Rong Zhang Cc: Arun Raghavan Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: loongarch@lists.linux.dev Cc: linux-mips@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linux-edac@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org Cc: linux-input@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: intel-wired-lan@lists.osuosl.org Cc: netdev@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: brcm80211@lists.linux.dev Cc: brcm80211-dev-list.pdl@broadcom.com Cc: devicetree@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-gpio@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: linux-nfs@vger.kernel.org Cc: devel@lists.orangefs.org Cc: linux-hardening@vger.kernel.org Cc: linux-sound@vger.kernel.org --- fs/nfs/nfsroot.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c index 432612d22437..a28208414aec 100644 --- a/fs/nfs/nfsroot.c +++ b/fs/nfs/nfsroot.c @@ -173,12 +173,15 @@ static int __init root_nfs_cat(char *dest, const char= *src, const size_t destlen) { size_t len =3D strlen(dest); + int ret; =20 - if (len && dest[len - 1] !=3D ',') - if (strlcat(dest, ",", destlen) >=3D destlen) - return -1; + if (len >=3D destlen) + return -1; =20 - if (strlcat(dest, src, destlen) >=3D destlen) + ret =3D snprintf(dest + len, destlen - len, "%s%s", + (len && dest[len - 1] !=3D ',') ? "," : "", src); + + if (ret < 0 || ret >=3D destlen - len) return -1; return 0; } --=20 2.55.0.1032.g73a4cd73de-goog