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Date: Mon, 22 Mar 2021 00:23:05 +0100 From: Emil Lenngren <emil.lenngren@...il.com> To: Luiz Augusto von Dentz <luiz.dentz@...il.com> Cc: 马麟 <linma@....edu.cn>, Marcel Holtmann <marcel@...tmann.org>, Johan Hedberg <johan.hedberg@...il.com>, David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>, "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, yajin_zhou@....edu.cn, syzkaller@...glegroups.com Subject: Re: BUG: Out of bounds read in hci_le_ext_adv_report_evt() Hi, Den mån 22 mars 2021 kl 00:01 skrev Luiz Augusto von Dentz <luiz.dentz@...il.com>: > Or we do something like > https://lore.kernel.org/linux-bluetooth/20201024002251.1389267-1-luiz.dentz@gmail.com/, > that said the reason we didn't applied my patches was that the > controller would be the one generating invalid data, but it seems you > are reproducing with vhci controller which is only used for emulating > a controller and requires root privileges so it is unlikely these > conditions would happens with hardware itself, in the other hand as > there seems to be more and more reports using vhci to emulate broken > events it perhaps more productive to introduce proper checks for all > events so we don't have to deal with more reports like this in the > future. Keep in mind that when using the H4 uart protocol without any error correction (as H5 has), it is possible that random bit errors occur on the wire. I wouldn't like my kernel to crash due to this. Bit errors happen all the time on RPi 4 for example at the default baud rate if you just do some heavy stress testing, or use an application that transfers a lot of data over Bluetooth. /Emil
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