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Date: Sat, 1 Aug 2020 08:38:33 +0300 From: Leon Romanovsky <leon@...nel.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Jason Gunthorpe <jgg@...pe.ca>, Peilin Ye <yepeilin.cs@...il.com>, Santosh Shilimkar <santosh.shilimkar@...cle.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Dan Carpenter <dan.carpenter@...cle.com>, Arnd Bergmann <arnd@...db.de>, linux-kernel-mentees@...ts.linuxfoundation.org, netdev@...r.kernel.org, linux-rdma@...r.kernel.org, rds-devel@....oracle.com, linux-kernel@...r.kernel.org Subject: Re: [Linux-kernel-mentees] [PATCH net] rds: Prevent kernel-infoleak in rds_notify_queue_get() On Fri, Jul 31, 2020 at 07:19:24PM +0200, Greg Kroah-Hartman wrote: > On Fri, Jul 31, 2020 at 11:36:04AM -0300, Jason Gunthorpe wrote: > > On Fri, Jul 31, 2020 at 04:21:48PM +0200, Greg Kroah-Hartman wrote: > > > > > > The spec was updated in C11 to require zero'ing padding when doing > > > > partial initialization of aggregates (eg = {}) > > > > > > > > """if it is an aggregate, every member is initialized (recursively) > > > > according to these rules, and any padding is initialized to zero > > > > bits;""" > > > > > > But then why does the compilers not do this? > > > > Do you have an example? > > At the moment, no, but we have had them in the past due to security > issues we have had to fix for this. Is it still relevant after bump of required GCC version to build kernel? I afraid that without solid example such changes will start to be treated with cargo cult. Jason, I'm using {} instead of {0} because of this GCC bug. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119 Thanks
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