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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45ef34b7d6bsm10805363f8f.10.2026.05.30.04.03.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 May 2026 04:03:05 -0700 (PDT) Date: Sat, 30 May 2026 12:03:03 +0100 From: David Laight To: Paul Moore Cc: Venkat Rao Bagalkote , linuxppc-dev , Madhavan Srinivasan , selinux@vger.kernel.org, rppt@kernel.org, LKML , Ritesh Harjani , "Christophe Leroy (CS GROUP)" Subject: Re: PowerPC: Random memory corruption causing kernel oops on Power11 Message-ID: <20260530120303.1b441fdc@pumpkin> In-Reply-To: References: <03e5151a-f420-46f9-ad5e-109420132021@linux.ibm.com> <8f0c86f7-eab4-4e82-97c1-5d190c390770@linux.ibm.com> <20260529171855.7966b752@pumpkin> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Fri, 29 May 2026 14:23:06 -0400 Paul Moore wrote: > On Fri, May 29, 2026 at 12:18=E2=80=AFPM David Laight ... > > PAGE_SIZE is not the length of the buffer. > > Should be PATH_MAX. =20 >=20 > Yes, as discussed earlier in the thread some additional work needs to > be done, and verified, but since we are at the end of -rc5 I simply > reverted the patch. We can chase this down next dev cycle. >=20 Emails crossed in the afternoon... Like many of these changes the buffer size should never have been PAGE_SIZE. Clearly here PATH_MAX is the best way to say 4096. But I suspect some of the others should be (say) BUF_4K. I wonder how much userspace code is left that does 'char buf[BUFSIZE]' and just assumes it is 'big enough'. -- David