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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id c37-20020a631c65000000b0043949b480a8sm10914556pgm.29.2022.09.26.11.23.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Sep 2022 11:23:11 -0700 (PDT) Date: Mon, 26 Sep 2022 11:23:11 -0700 From: Kees Cook To: andrey.konovalov@linux.dev Cc: Marco Elver , Andrew Morton , Andrey Konovalov , Alexander Potapenko , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov , kernel test robot Subject: Re: [PATCH mm v3] kasan: fix array-bounds warnings in tests Message-ID: <202209261123.91B4E71B2F@keescook> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1664216593; a=rsa-sha256; cv=none; b=prcvgUQ2Py33frRIRlwTYDOpZ0CX38k0Rx+Kj0eCb4WM+lmsISH6hTFTKT/zABJIK0xCfG 4j1itwWttE7nrTkJD2e0uL1m+FB8CHgSU3xHGgqapBCf5d32vWhnaei6Twuk2Nkw8SAIah 55SyKRy+Zfx9TMSil4DmVE+rTXxLho0= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b="F7JV5x/0"; dmarc=pass (policy=none) header.from=chromium.org; spf=pass (imf01.hostedemail.com: domain of keescook@chromium.org designates 209.85.214.175 as permitted sender) smtp.mailfrom=keescook@chromium.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1664216593; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ZbRJ8mO2p4vx8AyTjHr+MwJ8AVi8WB920WfIqpKjyQw=; b=ozaqWWIRBdcVXwndgpOAcXZXQrG+YNQVBZmGq7l0gPRtF+9kxI6looZOnU4CZaMmhMoo9I Qz6FjEsXToxZdJdjCCsdgMsDHkZdtd7dldOLSREhT+AlIpoSABpFz7GVMQ/CUZhz+zig2c w0QO1qsnQRv28bOacUiw19CdwFsTz9Y= X-Stat-Signature: 5dwtk8je3t4kg7bpiypbh9sjzagtbj34 X-Rspam-User: X-Rspamd-Server: rspam04 Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b="F7JV5x/0"; dmarc=pass (policy=none) header.from=chromium.org; spf=pass (imf01.hostedemail.com: domain of keescook@chromium.org designates 209.85.214.175 as permitted sender) smtp.mailfrom=keescook@chromium.org X-Rspamd-Queue-Id: 8B48C4000A X-HE-Tag: 1664216593-236360 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Sep 26, 2022 at 08:08:47PM +0200, andrey.konovalov@linux.dev wrote: > From: Andrey Konovalov > > GCC's -Warray-bounds option detects out-of-bounds accesses to > statically-sized allocations in krealloc out-of-bounds tests. > > Use OPTIMIZER_HIDE_VAR to suppress the warning. > > Also change kmalloc_memmove_invalid_size to use OPTIMIZER_HIDE_VAR > instead of a volatile variable. > > Reported-by: kernel test robot > Signed-off-by: Andrey Konovalov Reviewed-by: Kees Cook -- Kees Cook