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Open Source and information security mailing list archives
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Date: Wed, 2 Mar 2022 12:18:45 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Kees Cook <keescook@...omium.org> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>, David Laight <David.Laight@...lab.com>, James Bottomley <James.Bottomley@...senpartnership.com>, linux-wireless <linux-wireless@...r.kernel.org>, "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>, KVM list <kvm@...r.kernel.org>, "Gustavo A. R. Silva" <gustavo@...eddedor.com>, "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>, "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>, dri-devel <dri-devel@...ts.freedesktop.org>, Cristiano Giuffrida <c.giuffrida@...nl>, "Bos, H.J." <h.j.bos@...nl>, "linux1394-devel@...ts.sourceforge.net" <linux1394-devel@...ts.sourceforge.net>, "drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>, linux-arch <linux-arch@...r.kernel.org>, CIFS <linux-cifs@...r.kernel.org>, "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>, linux-scsi <linux-scsi@...r.kernel.org>, linux-rdma <linux-rdma@...r.kernel.org>, "linux-staging@...ts.linux.dev" <linux-staging@...ts.linux.dev>, amd-gfx list <amd-gfx@...ts.freedesktop.org>, Jason Gunthorpe <jgg@...pe.ca>, "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>, "kgdb-bugreport@...ts.sourceforge.net" <kgdb-bugreport@...ts.sourceforge.net>, "bcm-kernel-feedback-list@...adcom.com" <bcm-kernel-feedback-list@...adcom.com>, Dan Carpenter <dan.carpenter@...cle.com>, Linux Media Mailing List <linux-media@...r.kernel.org>, Arnd Bergman <arnd@...db.de>, Linux PM <linux-pm@...r.kernel.org>, intel-gfx <intel-gfx@...ts.freedesktop.org>, Brian Johannesmeyer <bjohannesmeyer@...il.com>, Nathan Chancellor <nathan@...nel.org>, dma <dmaengine@...r.kernel.org>, Christophe JAILLET <christophe.jaillet@...adoo.fr>, Jakob Koschel <jakobkoschel@...il.com>, "v9fs-developer@...ts.sourceforge.net" <v9fs-developer@...ts.sourceforge.net>, linux-tegra <linux-tegra@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>, linux-block <linux-block@...r.kernel.org>, Netdev <netdev@...r.kernel.org>, "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux F2FS Dev Mailing List <linux-f2fs-devel@...ts.sourceforge.net>, "tipc-discussion@...ts.sourceforge.net" <tipc-discussion@...ts.sourceforge.net>, Linux Crypto Mailing List <linux-crypto@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>, Andrew Morton <akpm@...ux-foundation.org>, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, Christian König <christian.koenig@....com>, Mike Rapoport <rppt@...nel.org> Subject: Re: [PATCH 2/6] treewide: remove using list iterator after loop body as a ptr On Wed, Mar 2, 2022 at 12:07 PM Kees Cook <keescook@...omium.org> wrote: > > I've long wanted to change kfree() to explicitly set pointers to NULL on > free. https://github.com/KSPP/linux/issues/87 We've had this discussion with the gcc people in the past, and gcc actually has some support for it, but it's sadly tied to the actual function name (ie gcc has some special-casing for "free()") See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94527 for some of that discussion. Oh, and I see some patch actually got merged since I looked there last so that you can mark "deallocator" functions, but I think it's only for the context matching, not for actually killing accesses to the pointer afterwards. Linus
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