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AJvYcCX62Cs64qYJ3GOOUV+eICm+rBy2Ii2v1pHs0TXOAEDbT8Owco3nI1tZfxRS1CxJMj4hZU+5s7KQV9SUUm0=@vger.kernel.org X-Gm-Message-State: AOJu0Yw43LQwKwCg2r2PDsgsG91HZihhCk7byef6tH3WDl9qcqYBkDQu dIGat54OudCAth3nRpuLeK7q0G4xI9mJw4jCybYSCAfsTQex0wVA X-Google-Smtp-Source: AGHT+IHMaGoJod9V7kdVUIxYTBfPtnmvUpb1uVIbjECmp/fAn5mHECQvrwe1vftSgzrPcmkOjQYBxg== X-Received: by 2002:a05:6808:1819:b0:3e6:3205:1a71 with SMTP id 5614622812f47-3e794699f41mr2047858b6e.15.1731043026129; Thu, 07 Nov 2024 21:17:06 -0800 (PST) Received: from [192.168.0.235] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7f41f643a60sm2482568a12.56.2024.11.07.21.17.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Nov 2024 21:17:05 -0800 (PST) Message-ID: <961720ed43b3df26042efc260d433fb6ddf5c44e.camel@gmail.com> Subject: Re: CVE-2023-52920: bpf: support non-r10 register spill/fill to/from stack in precision tracking From: Eduard Zingerman To: Shung-Hsi Yu , Andrii Nakryiko , cve@kernel.org Cc: Tao Lyu , Greg Kroah-Hartman , linux-kernel@vger.kernel.org Date: Thu, 07 Nov 2024 21:17:00 -0800 In-Reply-To: References: <2024110518-CVE-2023-52920-17f6@gregkh> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2024-11-08 at 12:42 +0800, Shung-Hsi Yu wrote: > Hi Andrii and Eduard, Hi Shung-Hsi, > I'm trying to determine the security implication of CVE-2023-52920, or > more specifically, what does commit 41f6f64e6999 ("bpf: support non-r10 > register spill/fill to/from stack in precision tracking") fix. > Superficially this looks more like an improvement to the verifier. It is my understanding as well, that this commit is an optimization to avoid some precision marks. I do not see any security implications. Thanks, Eduard [...]