From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (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 370B61B26D for ; Fri, 15 Sep 2023 20:15:13 +0000 (UTC) Received: by mail-pl1-f172.google.com with SMTP id d9443c01a7336-1c1ff5b741cso23500155ad.2 for ; Fri, 15 Sep 2023 13:15:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1694808912; x=1695413712; darn=lists.linux.dev; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=DD0PB0X4P5RpnzepdYBK20P6YgyKEeTbO8VvW3SzPE0=; b=G7JWx2QD222Z2e9SpslAnv1K13nQ6jarMgru0SCQs7Cx/tVX9UYu9ib6AUaKpL2Wvk sphPLD1sFxtRzUPhEayRGOZRyMXk5lbHKDs9KSp5ZMrS+DZArMnQLTvHRxwDM2C7WlBw v9r4P6ZYKoNm4CvSr+TgR818DOdhLxhumjmp4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694808912; x=1695413712; 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=DD0PB0X4P5RpnzepdYBK20P6YgyKEeTbO8VvW3SzPE0=; b=w6DYwd1sLMpAqMBl/bn7aNFyn1CYDiHPZLdoT7wblTwc469UJ6iVc3phNWH5fH6Esl 7oLoRDiU6n2Q15RlEWOeFcRk9AkLS1fXrNbcsSXfh56dlYjLvUWatA8SQvma5pmA/1a1 JyR6N6QhsX1arSL2HFNmg9pS5y2NgcptDTodt6LgGzu3wuH9OlnFxhWgaajNcK0DZYeq CDUWDIVvVKQE90Q2aFp3h2SOr2c7NDbVdB8aOsYEAlKG2Kvr5HI2kbc2E1szBDg7IW9i Kcl1kwDYF6I6734O0Iam3fYF9xy1+TVKOk0DOvV1V5imcAwO7fEoZqoATl7Llg0wbZto 4JZQ== X-Gm-Message-State: AOJu0YyaaU81tU27m7GIBT3hCsmKJQi2u14AsYuvM2AdMtNLbILbz4w3 WWuucpF/NypX1ajVt0M3dLGfZg== X-Google-Smtp-Source: AGHT+IFr13PLzk1XhNPHi5wQPBvpKN+JrCaS1AIy+WjDkGW+MxaOGCJr4sl9jUsUrz+Gxv7u4wWN9Q== X-Received: by 2002:a17:902:dac7:b0:1bf:4582:90d with SMTP id q7-20020a170902dac700b001bf4582090dmr3499033plx.46.1694808912608; Fri, 15 Sep 2023 13:15:12 -0700 (PDT) Received: from www.outflux.net (198-0-35-241-static.hfc.comcastbusiness.net. [198.0.35.241]) by smtp.gmail.com with ESMTPSA id u5-20020a170902b28500b001bb750189desm3860366plr.255.2023.09.15.13.15.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 13:15:12 -0700 (PDT) From: Kees Cook To: Ilya Dryomov Cc: Kees Cook , Xiubo Li , Jeff Layton , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , ceph-devel@vger.kernel.org, netdev@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH] ceph: Annotate struct ceph_monmap with __counted_by Date: Fri, 15 Sep 2023 13:15:10 -0700 Message-Id: <20230915201510.never.365-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2263; i=keescook@chromium.org; h=from:subject:message-id; bh=459xt744zpKd86AyMgpOkR51nqx31Cb+Bg+uK/o0T7M=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlBLtO5BRclquwJun9hzXP0EWlZ+GoTdZhGJ3lG aGjx/Zz1HyJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZQS7TgAKCRCJcvTf3G3A JsmGEACL2A1XKUQWibswLmpq3EltVpG/A8eKgv6ea2LwVOAXy0x4SXG4cHd9Cu0nk/qHBUbSafm /LRlD5lO/9C+ATYOdVAn9t0V3au/VIjn21sAW1gMsSMXTEBt4RYva6+8ekRrcCE6zJyxKRcZ8FV 1TP0oLZ+aZEmq83/afsOUMhAKZ73EU1YJrP2y7qEuhd9AasIKJxUVGM7DVcfrya6r/JmudEniQ/ slYEzs/iOWTdsEj98u6gHbxVZWi3l4+Z2chqEOmaA47jYTbgLzIPmPYPYPcWB1kjzGWo7sTENSL snWzCkLtSJUMzl4dC2P8qEjNTs9Z97Zfy+yyMAePSR5RQLGtIWKXITcZgFCekUIF7vLjevaPaV1 +LaCKf+sOzA2EWId/vEIG/kxz8h8dHLkrY/QRUmyY/uVFzbwLiOZE7DHTIBX2RKoIZGZEJUzBeR WNBaLF/w+lrRYldhG58wFjnEbGbgvVMya2tw0RpvwrbwceT8tHUcSV7MEFW5AduNfn/W80+XcU3 WDRvge5QEdCUPgTXx/dF6CwMbzLuJM8bVq/JMoDpnZhUBciUwbOy/Mj2aVFC17+IUS36d5chuol RHp8X04Aun56SGx2HOl8Y46SbRFH50UsjBo4xWwVLeRAjb1uW/Qjq7Ps3DWovxlJ5RdT/+l0n1p IJga5Lu zADa1NNA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit 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 ceph_monmap. Additionally, since the element count member must be set before accessing the annotated flexible array member, move its initialization earlier. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Ilya Dryomov Cc: Xiubo Li Cc: Jeff Layton Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: ceph-devel@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- include/linux/ceph/mon_client.h | 2 +- net/ceph/mon_client.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/ceph/mon_client.h b/include/linux/ceph/mon_client.h index b658961156a0..7a9a40163c0f 100644 --- a/include/linux/ceph/mon_client.h +++ b/include/linux/ceph/mon_client.h @@ -19,7 +19,7 @@ struct ceph_monmap { struct ceph_fsid fsid; u32 epoch; u32 num_mon; - struct ceph_entity_inst mon_inst[]; + struct ceph_entity_inst mon_inst[] __counted_by(num_mon); }; struct ceph_mon_client; diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c index faabad6603db..f263f7e91a21 100644 --- a/net/ceph/mon_client.c +++ b/net/ceph/mon_client.c @@ -1136,6 +1136,7 @@ static int build_initial_monmap(struct ceph_mon_client *monc) GFP_KERNEL); if (!monc->monmap) return -ENOMEM; + monc->monmap->num_mon = num_mon; for (i = 0; i < num_mon; i++) { struct ceph_entity_inst *inst = &monc->monmap->mon_inst[i]; @@ -1147,7 +1148,6 @@ static int build_initial_monmap(struct ceph_mon_client *monc) inst->name.type = CEPH_ENTITY_TYPE_MON; inst->name.num = cpu_to_le64(i); } - monc->monmap->num_mon = num_mon; return 0; } -- 2.34.1