lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 11 Aug 2020 13:15:51 +0200 From: Christoph Hellwig <hch@....de> To: Miles Chen <miles.chen@...iatek.com> Cc: Christoph Hellwig <hch@....de>, "David S . Miller" <davem@...emloft.net>, linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com Subject: Re: [PATCH] net: untag pointer in sockptr_is_kernel On Tue, Aug 11, 2020 at 06:27:04PM +0800, Miles Chen wrote: > From: Miles Chen <miles.chen@...iatek.com> > > sockptr_is_kernel() uses (sockptr.kernel >= TASK_SIZE) to tell > if the pointer is kernel space or user space. When user space uses > the "top byte ignored" feature such as HWAsan, we must untag > the pointer before checking against TASK_SIZE. > > sockptr_is_kernel() will view a tagged user pointer as a kernel pointer > and use memcpy directly and causes a kernel crash. Dave merged a patch from me to rever the optimized sockptr implementation for now. If we bring it back we should fold in your fix.
Powered by blists - more mailing lists