From nobody Mon Jun 8 04:24:54 2026 Received: from mail-qt1-f173.google.com (mail-qt1-f173.google.com [209.85.160.173]) (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 D4F2E34A3BF for ; Tue, 2 Jun 2026 02:40:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780368040; cv=none; b=qyPvYy4wZ4KnEaqotBLBGVyfK+M+23mHX1pujypDEbwL12oCeVc4gaQHdwGlnCmdG3XfBPIunrKuUua60hhGQkp/l2mxgvd0eGmzFagqe4nFkKGlVMIq7icg4uL+n+hss+8nZ/yzGASdizR7BxkNud0CFNaNKLqz7fH0hovhT14= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780368040; c=relaxed/simple; bh=pu3l4so7HE/6aPov23DNyoo+QaCHW2xwcQuz5IOG1Ok=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=MP1/OKZBSVOO0ejXlA/wVV6TPL2cC45bYCZlhMDyDLt54WlikY06JPfab3xpcKAXY3a9AJECvXUYh4azQ73rEcJE5NLCF9zx6cKggrl87h2J+XmAjXY5cxjEcRB28njQGzbFK6tWm0HudFlUkTR82gpnduIa04+vEOP95F6IMcQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Uq1zRBmW; arc=none smtp.client-ip=209.85.160.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Uq1zRBmW" Received: by mail-qt1-f173.google.com with SMTP id d75a77b69052e-517654b8e28so5301411cf.3 for ; Mon, 01 Jun 2026 19:40:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1780368038; x=1780972838; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=AeohTwvd4oZnskIqWgfC2EYaBkDAYS0G0xQwLeBQASs=; b=Uq1zRBmWgW/XNimxHN5i/mO2fpLsbBUNuQgr9D1ouxijxK1UHkOQkeHTFCx7NBf3th JiXrGQG68zgCnky9Wh89yJzm9BwWzK5ZqIqvztBbIolF9Q2aCgzNAckfLrtnEN8J9BMi 46MmAYjt2IwLfVNA9mXjZdYxk6PbyhnJ6QEGMzWlc02bp+XwWbMJj5Xlar4QgrS6r+Ux qY85l88Frhm0tiLh6OQR0lFlRCMCrQenpULrU5r00NIOmiA7DeyoGV8g/dUXE5vVe0zG wb9RVZmZhqProfBKYAAbehyH/CXCUAsRyN+rdNjC0Hlg0vNcL8kvGbu+Lg6Irt5EIqzL K8Yw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780368038; x=1780972838; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=AeohTwvd4oZnskIqWgfC2EYaBkDAYS0G0xQwLeBQASs=; b=GhesVchc9wAeUUGnqnjdTEeAUjdokpcSgtyZa7cWShbXq7Ems4A42/voOj+XxFZJlK QlM/hDcqa+SasJ1iOXm7xlFsTw8fQZWrcUda+DEe36TsyMnW7X0SbrfnJeuuNv7z3XB7 1fPmlnTkFJrlEnYk1zi+5oeMG65KLbJccjM6/g6q2Pki7frzsRaSjGj4fcsNdEnLRdl7 ngpY54ecT1dbN0foy/6U4Za1KQKzG1cPXpx6F2edpFZVHheYqRZcusWrRfxiySfveo50 HdV829hli5m9Y2uoLrDCcaUOhzWTnaUm2dJr3w6BkzhwR9POMTzX6ufsIv4n+9cohwMr eGlw== X-Forwarded-Encrypted: i=1; AFNElJ8M7lECTdt3yhMiFzRzgEiSCfc0amPSYcSITCPGP+Ee4yg/N9m1hwJWsx91bGpK0d8HpVUuvz4fNy65LxA=@vger.kernel.org X-Gm-Message-State: AOJu0YyEjgJtxhUlvSXL4S9AprQlIZ3XhgjyF+E21kRU4L437wecC+VZ E0RmzpgWLc1yO9bdJbntx/DGlPlbqkbIURSa1TuemJmFVl0gSC3ljOCh X-Gm-Gg: Acq92OEX66/H5X78he4hg6VmUMrKiy2Jtwk+e/q0M7vQXyELD1zYYY1/IK5VT5Uoz0S FecLDnPUa0dV5hvDhvyN6yaCl3GcgygVB2OGf3SDjgNC7FSK6GMSMJHdGUoemkRHqxh++QZaeTI gXLoe9Yqw8tExSDIOU2WU22EHbdOCIWwTVRD24O7Ddn87hxEy6lX/EcsB8jnAGkiRAAh7KE0klY SCObh6BEeWv20nO8MDfky4jW4d95y7lrqjTQ5pKTVNyejlOhccimvHmijnsdC7nPOPDWn3QLnZP d1fCzJSonoCaTms1xBjIQyfHd/BYqXJ21vfDwrlsPODYRcVDac9ZAu5tRHpZxE7qYuh9O1IF0iy Kw2WVnZ8ZL9D929wiDowJjoDNlMUIXMwJsP3eRIORDuN15V2zUowhPobi3QYzGkz6QVjCEJXjB9 8vYtQKzYPyDIKCYqVeW3yZsUaiSX9AoA8bRn7+rqiGJI0iB3OjOWr+XQI6kqK/mmkRxmaS3rsHL DNE X-Received: by 2002:a05:622a:6843:10b0:516:ea2d:7c5a with SMTP id d75a77b69052e-5173a8232d8mr154097731cf.41.1780368037828; Mon, 01 Jun 2026 19:40:37 -0700 (PDT) Received: from aiden-laptop.bowlinghome.net ([207.174.150.233]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8ccea23e115sm108327466d6.42.2026.06.01.19.40.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jun 2026 19:40:37 -0700 (PDT) From: Aiden Bowling To: Lorenzo Stoakes Cc: Andrew Morton , David Hildenbrand , Vlastimil Babka , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Aiden Bowling Subject: [PATCH] kernel/sys.c: fix prctl_set_auxv to use sizeof instead of user-supplied len Date: Mon, 1 Jun 2026 22:40:02 -0400 Message-ID: <20260602024001.14119-2-aidenlbowling56@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" prctl_set_auxv() passed the user-supplied 'len' to memcpy() when copying into mm->saved_auxv, instead of sizeof(user_auxv). Since user_auxv is already sized to the full auxv buffer, using 'len' risks a partial write if the caller supplies a smaller value. Use sizeof(user_auxv) to always copy the full buffer after validation. Signed-off-by: Aiden Bowling --- kernel/sys.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sys.c b/kernel/sys.c index 62e842055cc9..d3f5229649e3 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2189,7 +2189,7 @@ static int prctl_set_auxv(struct mm_struct *mm, unsig= ned long addr, BUILD_BUG_ON(sizeof(user_auxv) !=3D sizeof(mm->saved_auxv)); =20 task_lock(current); - memcpy(mm->saved_auxv, user_auxv, len); + memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv)); task_unlock(current); =20 return 0; base-commit: e43ffb69e0438cddd72aaa30898b4dc446f664f8 --=20 2.54.0