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[31.46.240.76]) by smtp.gmail.com with ESMTPSA id z18-20020adfec92000000b0033e7de97214sm16642393wrn.40.2024.03.21.02.05.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Mar 2024 02:05:10 -0700 (PDT) Sender: Ingo Molnar Date: Thu, 21 Mar 2024 10:05:08 +0100 From: Ingo Molnar To: Joan Bruguera =?iso-8859-1?Q?Mic=F3?= Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Thomas Gleixner , Uros Bizjak , Borislav Petkov , Dave Hansen , Peter Zijlstra , "H. Peter Anvin" Subject: Re: [PATCH 2/2] x86/bpf: Fix IP for relocating call depth accounting Message-ID: References: <20240316232104.368561-1-joanbrugueram@gmail.com> <20240316232104.368561-3-joanbrugueram@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240316232104.368561-3-joanbrugueram@gmail.com> * Joan Bruguera Mic? wrote: > The recently introduced support for %rip-relative relocations in the > call thunk template assumes that the code is being patched in-place, > so the destination of the relocation matches the address of the code. > This is not true for the call depth accounting emitted by the BPF JIT, > so the calculated address is wrong and usually causes a page fault. > > Pass the destination IP when the BPF JIT emits call depth accounting. > > Fixes: 17bce3b2ae2d ("x86/callthunks: Handle %rip-relative relocations in call thunk template") > Signed-off-by: Joan Bruguera Mic? > --- > arch/x86/include/asm/alternative.h | 4 ++-- > arch/x86/kernel/callthunks.c | 4 ++-- For the generic x86 changes - I guess you want to push this upstream via the networking tree: Acked-by: Ingo Molnar Thanks, Ingo