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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id p25sm957961iol.48.2019.06.26.20.32.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Jun 2019 20:32:53 -0700 (PDT) Subject: Re: [Linux-kernel-mentees][PATCH v2] packet: Fix undefined behavior in bit shift To: Jiunn Chang Cc: linux-kernel-mentees@lists.linuxfoundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, davem@davemloft.net, "skh >> Shuah Khan" References: <20190627010137.5612-1-c0d1n61at3@gmail.com> <20190627032532.18374-2-c0d1n61at3@gmail.com> From: Shuah Khan Message-ID: <7f6f44b2-3fe4-85f6-df3c-ad59f2eadba2@linuxfoundation.org> Date: Wed, 26 Jun 2019 21:32:52 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190627032532.18374-2-c0d1n61at3@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/26/19 9:25 PM, Jiunn Chang wrote: > Shifting signed 32-bit value by 31 bits is undefined. Changing most > significant bit to unsigned. > > Changes included in v2: > - use subsystem specific subject lines > - CC required mailing lists > These version change lines don't belong in the change log. > Signed-off-by: Jiunn Chang > --- Move them here. > include/uapi/linux/if_packet.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h > index 467b654bd4c7..3d884d68eb30 100644 > --- a/include/uapi/linux/if_packet.h > +++ b/include/uapi/linux/if_packet.h > @@ -123,7 +123,7 @@ struct tpacket_auxdata { > /* Rx and Tx ring - header status */ > #define TP_STATUS_TS_SOFTWARE (1 << 29) > #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */ > -#define TP_STATUS_TS_RAW_HARDWARE (1 << 31) > +#define TP_STATUS_TS_RAW_HARDWARE (1U << 31) > > /* Rx ring - feature request bits */ > #define TP_FT_REQ_FILL_RXHASH 0x1 > thanks, -- Shuah