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AJvYcCU9dktu9P1i/C7Qn4OfC5krhFw3XnTvmdYNBzSFKP1wqpx8JfgfxhVpUYVhF/RRua4SR5E6K9gwBw==@kvack.org X-Gm-Message-State: AOJu0Yzbo+8hx2Kl3jfBq2Z0i8slPhR62Bw/qEUsfWbUIyYSfgvTXNg9 hGS2/TJHk0SdH52JzxshQulDeSN7CK3vERILgeGtf4vDY1XZqfcGc9xgZ9TdzuvbB4PtzMjVi+5 rxQo/0D0Qy4bF1rABg+8mxuPGUPzH6Tf64XOp4/+N X-Gm-Gg: ASbGnctgPrHQaNopcpp/+iWm4oVQ6tgZJRuyVL594pSLOuDf3N8sJL/G3F9LhAXvKMR isuBTjUwOm/JTD9BLrtQZ5G+QKOXOQgPXmvXkfhABKOhUrvsg6tid3P+mzi1vnasRJ/CahvKFew bWMSTkuHL2HFWm+9PYlz9tIh5zDUE6LJUeQH0nas47+tZu+/6b2qWaCYBFhjJGYAsKuOonXh3WR CUKrr380kr5X+ae3/iibtefj949qkX55azP8fSaiIoZ3oNKBGDUUPlXbAim7Shh5Qb6/edsf0tB cA4YDcS06EdetZ8= X-Google-Smtp-Source: AGHT+IHeuRC7ChrdFjjxvcWC3ajdMKHJ+Azj7LDyTH5BCluSFj1o6p4ZSWP6EGrRrokOPiEV3z2rvlDUhI4wexrXKNM= X-Received: by 2002:a0c:e00a:0:b0:882:4660:3724 with SMTP id 6a1803df08f44-88246605291mr69808466d6.63.1762795978283; Mon, 10 Nov 2025 09:32:58 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Alexander Potapenko Date: Mon, 10 Nov 2025 18:32:21 +0100 X-Gm-Features: AWmQ_bmUvxxbg_c-XB1Dy80QL57feg4coPRIZHNTl9ervff8Rzi8S1pGrWY59Fo Message-ID: Subject: Re: [PATCH v6 01/18] kasan: Unpoison pcpu chunks with base address tag To: Maciej Wieczor-Retman Cc: xin@zytor.com, peterz@infradead.org, kaleshsingh@google.com, kbingham@kernel.org, akpm@linux-foundation.org, nathan@kernel.org, ryabinin.a.a@gmail.com, dave.hansen@linux.intel.com, bp@alien8.de, morbo@google.com, jeremy.linton@arm.com, smostafa@google.com, kees@kernel.org, baohua@kernel.org, vbabka@suse.cz, justinstitt@google.com, wangkefeng.wang@huawei.com, leitao@debian.org, jan.kiszka@siemens.com, fujita.tomonori@gmail.com, hpa@zytor.com, urezki@gmail.com, ubizjak@gmail.com, ada.coupriediaz@arm.com, nick.desaulniers+lkml@gmail.com, ojeda@kernel.org, brgerst@gmail.com, elver@google.com, pankaj.gupta@amd.com, mark.rutland@arm.com, trintaeoitogc@gmail.com, jpoimboe@kernel.org, thuth@redhat.com, pasha.tatashin@soleen.com, dvyukov@google.com, jhubbard@nvidia.com, catalin.marinas@arm.com, yeoreum.yun@arm.com, mhocko@suse.com, lorenzo.stoakes@oracle.com, samuel.holland@sifive.com, vincenzo.frascino@arm.com, bigeasy@linutronix.de, surenb@google.com, ardb@kernel.org, Liam.Howlett@oracle.com, nicolas.schier@linux.dev, ziy@nvidia.com, kas@kernel.org, tglx@linutronix.de, mingo@redhat.com, broonie@kernel.org, corbet@lwn.net, andreyknvl@gmail.com, maciej.wieczor-retman@intel.com, david@redhat.com, maz@kernel.org, rppt@kernel.org, will@kernel.org, luto@kernel.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-kbuild@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, linux-doc@vger.kernel.org, stable@vger.kernel.org, Baoquan He Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: AC8E312000F X-Stat-Signature: juhoauq9whg5zneza1ixfyurfyc651pw X-HE-Tag: 1762795979-967489 X-HE-Meta: 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 oyYJCbLB wvAc9TLCKZTsdafarS39oAOstJZERXdP40Mxmz6qCbgIQLbzY9yHEvJ09AF/2wtvGJKhy8GZ1ujsKwxYDIuK+0s8mIKa2ncBz1HaPbD/xukDTAv8elDhy3pJX1exzQOQIL2nxoLVcxiSifOq10M6j+A1KuFwrhQJM7E7ZQEsAV+uWYYrZScYPy4P1F/rH1Q1syfPOVEyifrQhbqba7KbIVa7aH+43jj198mWzuAG0a+xugCgr+q3IChCXL7vvbt6vQpNvDdyNAsbiuZqn19XW6zUkMLP9cvHon5mT9v4VBIzorjAaRQQ5TDFBYiyzY9ERgF6+WKMwRGG1zBY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Oct 29, 2025 at 8:05=E2=80=AFPM Maciej Wieczor-Retman wrote: > > From: Maciej Wieczor-Retman > > The problem presented here is related to NUMA systems and tag-based > KASAN modes - software and hardware ones. It can be explained in the > following points: > > 1. There can be more than one virtual memory chunk. > 2. Chunk's base address has a tag. > 3. The base address points at the first chunk and thus inherits > the tag of the first chunk. > 4. The subsequent chunks will be accessed with the tag from the > first chunk. > 5. Thus, the subsequent chunks need to have their tag set to > match that of the first chunk. > > Refactor code by moving it into a helper in preparation for the actual > fix. The code in the helper function: > +void __kasan_unpoison_vmap_areas(struct vm_struct **vms, int nr_vms) > +{ > + int area; > + > + for (area =3D 0 ; area < nr_vms ; area++) { > + kasan_poison(vms[area]->addr, vms[area]->size, > + arch_kasan_get_tag(vms[area]->addr), false); > + } > +} is different from what was originally called: > - for (area =3D 0; area < nr_vms; area++) > - vms[area]->addr =3D kasan_unpoison_vmalloc(vms[area]->add= r, > - vms[area]->size, KASAN_VMALLOC_PROT_NORMA= L); > + kasan_unpoison_vmap_areas(vms, nr_vms); , so the patch description is a bit misleading. Please also ensure you fix the errors reported by kbuild test robot.