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[84.3.50.134]) by smtp.gmail.com with ESMTPSA id t18sm9577563edr.79.2020.08.15.10.46.42 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Aug 2020 10:46:42 -0700 (PDT) Date: Sat, 15 Aug 2020 19:46:40 +0200 From: Ingo Molnar To: stable kernel team Subject: [edumazet@google.com: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task] Message-ID: <20200815174640.GA2718256@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org hi Greg, Please apply upstream 8ab49526b53d to all stable kernels containing 07e1d88adaae, which should be v4.20 and higher stable kernels. Thanks, Ingo ----- Forwarded message from Eric Dumazet ----- Date: Sat, 15 Aug 2020 10:38:58 -0700 From: Eric Dumazet To: Ingo Molnar Cc: linux-kernel , Eric Dumazet , Jann Horn , syzbot , Andy Lutomirski , "Chang S . Bae" , Andy Lutomirski , Borislav Petkov , Brian Gerst , Dave Hansen , Denys Vlasenko , "H . Peter Anvin" , Linus Torvalds , Markus T Metzger , Peter Zijlstra , Ravi Shankar , Rik van Riel , Thomas Gleixner Subject: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task On Sat, Aug 15, 2020 at 4:48 AM Ingo Molnar wrote: > > > * Eric Dumazet wrote: > > > syzbot found its way in 86_fsgsbase_read_task() [1] > > > > Fix is to make sure ldt pointer is not NULL. > > Thanks for this fix. Linus has picked it up (inclusive the typos to > the x86_fsgsbase_read_task() function name ;-), it's now upstream > under: > > 8ab49526b53d: ("x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task") > > By the fixes tag it looks like this should probably be backported all > the way back to ~v4.20 or so? This is absolutely right, sorry about the lack of a stable tag. Most of my patches usually land into David Miller trees, where the stable tag is not welcomed. We use Fixes: tags to convey the exact information needed for stable backports. Thanks. ----- End forwarded message -----