From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f169.google.com (mail-pl1-f169.google.com [209.85.214.169]) (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 897F21B26D for ; Fri, 15 Sep 2023 20:14:16 +0000 (UTC) Received: by mail-pl1-f169.google.com with SMTP id d9443c01a7336-1c43b4b02c1so7454285ad.3 for ; Fri, 15 Sep 2023 13:14:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1694808856; x=1695413656; 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=9t4c7iG7BwJixU6psOPlOQYO3J4oZ/NM5PDqz6Jeo04=; b=YgRd6n/fKL/oPE7NqctKiD2yg7mZqXCK2Biabn2I1WhRcYZVetIGS57dTpUR9A0CZN kgU67ak9wk8letx/8AycRFNf7FT2nQOKyNEnIVaKjWhV3iEqors0NQa6xBv7VYFdYptR jj1C73ow1A+r3EqKqaPLDPuEyZpH9oPCR6kEo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694808856; x=1695413656; 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=9t4c7iG7BwJixU6psOPlOQYO3J4oZ/NM5PDqz6Jeo04=; b=kw0j8LDpArTBN958vQPxdyW7jx3rH4KLRyjvaI81XQd5/1QW/KLA6vxRuvc6oXQZX0 F1Ii1VQuJL8GfeipaXli9EiBny4TFQQbIVGRPA1zF8ytCeNWKKgt2OzoQXeIaczWaeEZ pU4otNAEr5qDsjRgjEJxPA8P6Bz9vTcSAmKIYY1whbGUzJMRliug9Flcwwdd5NTHe7VJ kUhlybvzS9ehNMJI5xppLZeVVKG47HTF2jCkLoNm2y3ABM6GEZXP93sLqbwiIkutWuK3 Kgjt0rIGuC/7OVONUsWAD2tif7zjIz1ScqpvDwFWKtcvJm1WZrsZtcFvJOWerK7oL6nh ZtEw== X-Gm-Message-State: AOJu0YwErUij0IMbM8v3/2E4MelE5e3pN44eMsd2F89aT7zqLEtg5wrt QTkUWN/r/ktaCndAH/a/6zMyXg== X-Google-Smtp-Source: AGHT+IGgXyGAghZv7pszt8rqPpCweXXdiMo6SZzmmUtM+9AUGmv0Zkuf+i1pa/kjEbWVyhBGaegRbw== X-Received: by 2002:a17:902:8691:b0:1c4:a16:f88f with SMTP id g17-20020a170902869100b001c40a16f88fmr2591006plo.36.1694808855939; Fri, 15 Sep 2023 13:14:15 -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 kg14-20020a170903060e00b001c41e1e9ca7sm3059479plb.215.2023.09.15.13.14.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 13:14:15 -0700 (PDT) From: Kees Cook To: Benjamin LaHaise Cc: Kees Cook , Alexander Viro , Christian Brauner , linux-aio@kvack.org, linux-fsdevel@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] aio: Annotate struct kioctx_table with __counted_by Date: Fri, 15 Sep 2023 13:14:14 -0700 Message-Id: <20230915201413.never.881-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=1127; i=keescook@chromium.org; h=from:subject:message-id; bh=1qAoiZuMRAuvDZRUcSDPW5lLo0Ae9xZ4UiTXDEh1mTE=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlBLsWaTUS2aPe9DYGUrDZPo05lmzAICnFfTNt4 TuHABaIVB+JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZQS7FgAKCRCJcvTf3G3A JoNvD/wI9Ez/xecwMst1xwqWO5PzTIz1ZADRxzr2MoMrg+bF+zVBEO3uiWXoI4pY9farlKnMZOW F5S+SAgyURn2G3c6PN1WVEuc3Y9424hN2if8MTSVs0Nbk2EYZYm06r4Douy2vRy0YkSAWpssZ4v kymW916TdLMSRQ/VlhTwIqb/EogyHshGE7Zu0yDtUhDbfNo/bgJHm1Eb6BVnfWOYPkexC2wepRA /2J8yT+u4nZPjAW/UCwuRiP1zLd+xRXCtOQ9gm8mzijyKmqsRVlbzYa5UgI1Qr2byEv0P+KjR+K y6G/DhhriaqRy0FKJe0VObtQR56fWtLn/iUbIXW1qHAqKOVt3+/Xx/Qy+k6d9q+FucGZchog81Y 2br884EAL0MMUhCaLcwaFg4xWRh29AeG8bLDSSNwC9EIOIo6FlJdiPX8HsYfDRb2OkHYBrsCpUi suZXovmTwkZpy/XU8KHgnb7LmtJc2yZDea0oHJJbmJudfvmiUROsu2gT6uXwwCfFTZxacyfSznc ASqN8epE+clvMgEB/6HAUJXqXXb33j045MB2iUYymLfTnXHdblZnb/8GXLjn8Vs2KlOKemgOj3C lfmwn7j/b71qoQYPbLyXrt6loyYO6Zx7zzMnblLcq56S/LCrSIUYj5v7p70QXU/45+14jBKbzhy hj/G1EM dIHavvSg== 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 kioctx_table. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Benjamin LaHaise Cc: Alexander Viro Cc: Christian Brauner Cc: linux-aio@kvack.org Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Kees Cook --- fs/aio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/aio.c b/fs/aio.c index a4c2a6bac72c..f8589caef9c1 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -80,7 +80,7 @@ struct aio_ring { struct kioctx_table { struct rcu_head rcu; unsigned nr; - struct kioctx __rcu *table[]; + struct kioctx __rcu *table[] __counted_by(nr); }; struct kioctx_cpu { -- 2.34.1