From nobody Mon Feb 9 15:07:58 2026 Received: from mail-pg1-f172.google.com (mail-pg1-f172.google.com [209.85.215.172]) (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 562F1146904 for ; Fri, 16 Feb 2024 23:27:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708126069; cv=none; b=k41uAX1uhtcAwUQMe5IV3n2xiR2EgKYJRBQh9zCOD5oHheswhaKUpp4eRVAuw1EAlD4Im2H9PJ8u8AOObvzdvJGdD3cDB4jwqmYVt4qafr6oE/nu9B3Ctt1RRxcWzWWnSUBD3qAJ9gMqIEM7t3mh3PBtLAONvYCwVPmopXK0G5c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708126069; c=relaxed/simple; bh=RNT0g0cgXQrcIvbNgrkk3LhFhJNchXw4WLd58eWGTyM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=WMym5lUPTwVNTSChcJoMOhB++PV8eHIvO6E2inXQhdJ+AKjis8O/KOkxfDbKTBUxzZ5a+Lvf30EcGIZNrSNNnzFwJx9TdOVa76z6uISohtJSKLwApIE5WcQgdKyqDalPi6CchfFHTEmHqHZREeUF6mm1iVBH630ejsPeMYirvRE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=SRBq0NJN; arc=none smtp.client-ip=209.85.215.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="SRBq0NJN" Received: by mail-pg1-f172.google.com with SMTP id 41be03b00d2f7-5d42e7ab8a9so1946700a12.3 for ; Fri, 16 Feb 2024 15:27:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1708126067; x=1708730867; 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=lLi9PHtxZsuZz7e5RQdykX5MWOEl3dE9qrCPIM1hrRo=; b=SRBq0NJNtAZ6jpCpaDoDq0gS2MIV1sFPCquA0NnTAn0Bn4+TCURcDgAjIDwJ5oVser eeounGyiNP722gPZ4vqG3zFwHZeCT5zHIZZj/QNwLUB/DA6U5ImtNn8MuYPeAyPRlbzK /OVmhGvYIXJeeObYRBrFPapXbsXeD2Yx0EVHo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708126067; x=1708730867; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=lLi9PHtxZsuZz7e5RQdykX5MWOEl3dE9qrCPIM1hrRo=; b=CSvE0fP+aWFSdkgYtiLU4we1ekgB7LZ0nCk2PsyoAfzh+o5NWWr1I0MMGfqOOqhMMT l+jmjlJOwChiuMkewUTSIkVJgZq8FKZtpLCTPgz6YSdY/reiKsG9zGw4CLIIALqhjYSt I2H+ZDoW0qC0YEFVaHth9Hnr3OKV77dYaPyVx53el6zxY13EjEg22clDZAEZi+8yyu8v hzj2vm9pq2vwtKTrZZz8PBBMcvcU58TUw82zMFlz5GO/LgjkFIyNdUR6ok7EDo10iUqT RGUFU8BYUX1uLoBS2FrMFAPogzrbLgawox+zV3W228C0HUn3uFNHh58hMSUIl8FVR0Kd Sy1w== X-Forwarded-Encrypted: i=1; AJvYcCWjB3+FQSfAxQ4YtHCovdFdPtMGvvCFJo8+Rrb2GcygA+R5j1SeIeYsvYXBPhKUvjmEo6oJtMiUPOhDzlHq1L69WYe2e/Bnx/h1/Ir+ X-Gm-Message-State: AOJu0YyPAZB0cxEtTFi2rRBKGAod9zd6NZTex82VEUkzBu7VE5xUCIy6 mz6a77jjw4tdoURB6Uw03zkKZ/9i0VuC19gLMlr8Yz92Go7uSJKobBf+s7zxmg== X-Google-Smtp-Source: AGHT+IGPCpilatN+troOQhhuhZJ1ZyJIP1f1BukTAiQCIoKk/LNCdR5GS6r7rJFOX+rcu0p3vRbu7Q== X-Received: by 2002:a05:6a20:4fa2:b0:19e:a9bf:d51a with SMTP id gh34-20020a056a204fa200b0019ea9bfd51amr5455247pzb.32.1708126067651; Fri, 16 Feb 2024 15:27:47 -0800 (PST) Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id kn14-20020a170903078e00b001d8f82c61cdsm369379plb.231.2024.02.16.15.27.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Feb 2024 15:27:47 -0800 (PST) From: Kees Cook To: Jakub Kicinski Cc: Kees Cook , Jamal Hadi Salim , Cong Wang , Jiri Pirko , "David S. Miller" , Eric Dumazet , Paolo Abeni , "Gustavo A. R. Silva" , netdev@vger.kernel.org, linux-hardening@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] net: sched: Annotate struct tc_pedit with __counted_by Date: Fri, 16 Feb 2024 15:27:44 -0800 Message-Id: <20240216232744.work.514-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2338; i=keescook@chromium.org; h=from:subject:message-id; bh=RNT0g0cgXQrcIvbNgrkk3LhFhJNchXw4WLd58eWGTyM=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlz+9w9qSnRo2mb+YJM+Gu1IwPUsAtgHSw+l89v SbeoLT1YpuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZc/vcAAKCRCJcvTf3G3A JgMGD/9xRXBIxLCBH7+ga8H8o/WOsCi9LCOVzwWZDpHbh6TZefl0ftvDhBHx7fg1n4l61k6f3w9 1El1BpQBebgi7nX+Ets4Ub4/N8660HPXoRbAz6As6Ne5h8z2F1kw3ZBn6ITb7uqN2izMxRfy3/T 8XA/eTuICYCEYDIQa4FqnmhVLh6WkR8mN0/N+LTAymXxd00ECGrhXlJW2dhrUhhTbhkzdvUF3WB XEWJGtf4nP0kA3omfRN5CDGZ0YjDY2GS1mKIvj6eoJZrXXb+a09jCGPm9Y7qU1MB0F5A8pVlwNF hK3T5yvnAdsN2FsboC223ZEzRd9XnGjM+xA+ZoQtpE5cKpu/HX80H11TmqAw/RZZtwbycKZ3MN1 VAlI70Igu9n71hjMCRL6of2MjZud4bPUAduFb42FOvZvXqiKkkwRD0LAy0+R2VX8/KsB2E4TrUA vKh4f615Zd5qR3DKd3mjl1F5VnBxqa7oW67YYU/f+MCg86r+pT9RYj3Yl2tLNnjtBTLG+ePv8rK otI00CvwQ2/R2IU/zEL5jtJqM9y+xTTP4Y2MVa2Mv/3RJSPHSSV8x40Hrpc+RA6rIjMFj19BWI5 oKc5WEPBofLAACgXz8fhUrXfyuUZfg0qeE0JqzukNFzqWGCbGESpOyHoQBYnslPSqhqGdZ3oJjl TVrnnPI y3rX9jFg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct tc_pedit. Additionally, since the element count member must be set before accessing the annotated flexible array member, move its initialization earlier. Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/c= ounted_by.cocci [1] Signed-off-by: Kees Cook Acked-by: Jamal Hadi Salim Reviewed-by: Gustavo A. R. Silva --- Cc: Jakub Kicinski Cc: Jamal Hadi Salim Cc: Cong Wang Cc: Jiri Pirko Cc: "David S. Miller" Cc: Eric Dumazet Cc: Paolo Abeni Cc: "Gustavo A. R. Silva" Cc: netdev@vger.kernel.org Cc: linux-hardening@vger.kernel.org --- include/uapi/linux/tc_act/tc_pedit.h | 2 +- net/sched/act_pedit.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/tc_act/tc_pedit.h b/include/uapi/linux/tc_a= ct/tc_pedit.h index f3e61b04fa01..f5cab7fc96ab 100644 --- a/include/uapi/linux/tc_act/tc_pedit.h +++ b/include/uapi/linux/tc_act/tc_pedit.h @@ -62,7 +62,7 @@ struct tc_pedit_sel { tc_gen; unsigned char nkeys; unsigned char flags; - struct tc_pedit_key keys[0]; + struct tc_pedit_key keys[] __counted_by(nkeys); }; =20 #define tc_pedit tc_pedit_sel diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c index 2ef22969f274..21e863d2898c 100644 --- a/net/sched/act_pedit.c +++ b/net/sched/act_pedit.c @@ -515,11 +515,11 @@ static int tcf_pedit_dump(struct sk_buff *skb, struct= tc_action *a, spin_unlock_bh(&p->tcf_lock); return -ENOBUFS; } + opt->nkeys =3D parms->tcfp_nkeys; =20 memcpy(opt->keys, parms->tcfp_keys, flex_array_size(opt, keys, parms->tcfp_nkeys)); opt->index =3D p->tcf_index; - opt->nkeys =3D parms->tcfp_nkeys; opt->flags =3D parms->tcfp_flags; opt->action =3D p->tcf_action; opt->refcnt =3D refcount_read(&p->tcf_refcnt) - ref; --=20 2.34.1