From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f198.google.com (mail-pl1-f198.google.com [209.85.214.198]) (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 D90A146AA8B for ; Tue, 15 Sep 2026 08:20:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789460442; cv=none; b=BWUhnubdbgCwDSy2JrAJakn+g+W0pabudU1O6tnFSPlQKEUSCZySX6gSaKsskB4K2mVpxJcOmIxpRec5ka6/4gjDkREpbmb2aJ5bF0vhH4/NskcGktrgn4s472R9J16/ht/0tJNAWVS0IWlA6iq0tvqIh1G2KOEhf89U2vy1InM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789460442; c=relaxed/simple; bh=Hf8Hcf3/GVCrKP3bnfnvDYzjoz8pInTEuZeXHBnhpZg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=dwJP8LRq8MeyUL3HXC6C7ZgRxIopX5EEQeIfkAVpTuQEQgm8fxdmj3eH67mRFl8SVhqwibw39rU7GPyAbSi9g3gj3yeaGxq4nDq7NVYwfNI3I7Vp3BZJ3B8dxDOFb9l3ZPf3UHpuZJEDZWhnV1yIXvBy9abViJ1yLaprqrPZEh4= 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=IN8XvKKU; arc=none smtp.client-ip=209.85.214.198 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="IN8XvKKU" Received: by mail-pl1-f198.google.com with SMTP id d9443c01a7336-2dc7337e2a7so52771585ad.0 for ; Tue, 15 Sep 2026 01:20:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1789460397; x=1790065197; darn=lists.linux.dev; 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=q9qHU7CDEu6zWWmniYe9q2ucwWYfoa3UieeTJM1aJto=; b=IN8XvKKU++txrYJhJ/ohNQXbhmwbm8UunR1n9RC+teTsI6kQ76jccJNpAUEYMBaloN k/NsSe2Yg5BSZeW7/N7Sal0MbkX+EgIrUzKcP9g6lVrlfcWaLCQqXTXV1jb9ojLKjZ9y L6H3HV+g2Lp+4DHkFC9APG+8IZA+UORicxQTVTi2M8W2YCo2gQzXexJAwaJI661gUh0k UUofXS54RZ4tBq5UptpFt8dSjDer0HXXmVyRNc0tkENG8DVpt716gf2VkYIwIQBAPtzQ TcDeyiV4EaFdFnJ12GdzLoqjurzep6jeBwZnNWjiEzs3CjkmmcQrq9zXNEssYatTCMbj SG6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789460397; x=1790065197; 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=q9qHU7CDEu6zWWmniYe9q2ucwWYfoa3UieeTJM1aJto=; b=bstjIFNqFdbBpqjffylVUsuhTuq/5IP9gVzcxrLZSKbnS/W/uIKNhNsyMPrdoKVGT/ FYrXcwIJUb7xC8sxbUpjcF7F71qC+QfswfL3PBeq7oJv+2QWISz2opPFsRiq+phnBQHq qfQBOndP0YzNEnKOjvwml5fyEBKrJORGRA6O1/GY+J7MVpEGi8/MZUkelihDBTqt6H61 FcV81IAVIXi4pAAz5H/iRRhEq5qdkTkv7rLTJFd7FtzbxjRdcKj8fqbI++cLMFlxarUd iBfjJsu1cUoZc0BwsetbisP1CYUij7/ZthqHIE8t6h5rUQLPAxQdb1/08xQlqwOfM0Ue lysw== X-Forwarded-Encrypted: i=1; AKwUvBzhSEpV2zcnYKBxxVYSbKDJFgmV24svTE0RmZhssFcO0qj/kyGhtYtMRbkgd7PkGn6rKG32hfurcdo=@lists.linux.dev X-Gm-Message-State: AFuF++lnSFYkl6voEx1CxairrNxArRQW8bf+fjZhVGlNgqcD6qiABl1w eSJmlcRNvpFnTiyxbz8kw8vSK8bbFKYqUoLGFc2wuLZr0Yyt2b3f21o0zcj2tiy9qoy/Qnn3kDT e X-Received: from plhc17.prod.google.com ([2002:a17:903:2351:b0:2cf:ca4d:25e3]) (user=morbo job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:2408:b0:2d8:d4ce:9f32 with SMTP id d9443c01a7336-2dd83869ae3mr512075ad.16.1789460397125; Tue, 15 Sep 2026 01:19:57 -0700 (PDT) Date: Tue, 15 Sep 2026 08:18:27 +0000 In-Reply-To: <20260915081910.4142719-1-morbo@google.com> Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev 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: <20260915081910.4142719-11-morbo@google.com> Subject: [PATCH 10/28] of/fdt: Replace strlcat() with snprintf() in early_init_dt_scan_chosen() 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 When CONFIG_CMDLINE_EXTEND is enabled, early_init_dt_scan_chosen() uses two strlcat() calls to append a space and CONFIG_CMDLINE to the command line buffer. In preparation for removing the deprecated strlcat() API[1], replace the strlcat() calls with a single snprintf() call using the existing string length. Additionally, check for a NULL initial_boot_params pointer and jump to "handle_cmdline" so that CONFIG_CMDLINE handling still occurs without dereferencing a NULL FDT pointer in fdt_path_offset(). Link: https://github.com/KSPP/linux/issues/370 [1] Cc: codemender-patching+linux@google.com Assisted-by: Assistant:Claude-3.5-Sonnet [editor_update_file, shell_command= _run] 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 --- drivers/of/fdt.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index a64afc3ded3d..311021a83f03 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1095,6 +1095,9 @@ int __init early_init_dt_scan_chosen(char *cmdline) const void *rng_seed; const void *fdt =3D initial_boot_params; =20 + if (!fdt) + goto handle_cmdline; + node =3D fdt_path_offset(fdt, "/chosen"); if (node < 0) node =3D fdt_path_offset(fdt, "/chosen@0"); @@ -1133,8 +1136,12 @@ int __init early_init_dt_scan_chosen(char *cmdline) */ #ifdef CONFIG_CMDLINE #if defined(CONFIG_CMDLINE_EXTEND) - strlcat(cmdline, " ", COMMAND_LINE_SIZE); - strlcat(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE); + { + size_t len =3D strlen(cmdline); + + if (len < COMMAND_LINE_SIZE) + snprintf(cmdline + len, COMMAND_LINE_SIZE - len, " %s", CONFIG_CMDLINE)= ; + } #elif defined(CONFIG_CMDLINE_FORCE) strscpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE); #else --=20 2.55.0.1032.g73a4cd73de-goog