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[79.224.240.123]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b7e898b99sm49008435e9.19.2025.08.29.12.13.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Aug 2025 12:13:06 -0700 (PDT) Message-ID: Date: Fri, 29 Aug 2025 21:13:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] arm64: mm: Fix CFI failure due to kpti_ng_pgd_alloc function signature To: Kees Cook , Kevin Brodsky Cc: Ard Biesheuvel , Ryan Roberts , Mark Rutland , Catalin Marinas , Will Deacon , Anshuman Khandual , Oliver Upton , Yue Haibing , Marc Zyngier , Mark Brown , Andrew Morton , linux-arm-kernel@lists.infradead.org, Joey Gouly , Shameer Kolothum , Yeoreum Yun , James Morse , Hardevsinh Palaniya , Zhenhua Huang , Lorenzo Stoakes , Dev Jain , Yicong Yang , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org References: <20250829190721.it.373-kees@kernel.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20250829190721.it.373-kees@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 8AX_CRRuVbh2h1wwPZ1X_mzNXVv9v3qHTYUWnjPjEcg_1756494787 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250829_121311_899082_0F850D40 X-CRM114-Status: GOOD ( 20.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 29.08.25 21:07, Kees Cook wrote: > Seen during KPTI initialization: > > CFI failure at create_kpti_ng_temp_pgd+0x124/0xce8 (target: kpti_ng_pgd_alloc+0x0/0x14; expected type: 0xd61b88b6) > > The call site is alloc_init_pud() at arch/arm64/mm/mmu.c: > > pud_phys = pgtable_alloc(TABLE_PUD); > > alloc_init_pud() has the prototype: > > static void alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end, > phys_addr_t phys, pgprot_t prot, > phys_addr_t (*pgtable_alloc)(enum pgtable_type), > int flags) > > where the pgtable_alloc() prototype is declared. > > The target (kpti_ng_pgd_alloc) is used in arch/arm64/kernel/cpufeature.c: > > create_kpti_ng_temp_pgd(kpti_ng_temp_pgd, __pa(alloc), KPTI_NG_TEMP_VA, > PAGE_SIZE, PAGE_KERNEL, kpti_ng_pgd_alloc, 0); > > which is an alias for __create_pgd_mapping_locked() with prototype: > > extern __alias(__create_pgd_mapping_locked) > void create_kpti_ng_temp_pgd(pgd_t *pgdir, phys_addr_t phys, > unsigned long virt, > phys_addr_t size, pgprot_t prot, > phys_addr_t (*pgtable_alloc)(enum pgtable_type), > int flags); > > __create_pgd_mapping_locked() passes the function pointer down: > > __create_pgd_mapping_locked() -> alloc_init_p4d() -> alloc_init_pud() > > But the target function (kpti_ng_pgd_alloc) has the wrong signature: > > static phys_addr_t __init kpti_ng_pgd_alloc(int shift); > > The "int" should be "enum pgtable_type". > > To make "enum pgtable_type" available to cpufeature.c, move > enum pgtable_type definition from arch/arm64/mm/mmu.c to > arch/arm64/include/asm/mmu.h. > > Adjust kpti_ng_pgd_alloc to use "enum pgtable_type" instead of "int". > The function behavior remains identical (parameter is unused). > > Fixes: c64f46ee1377 ("arm64: mm: use enum to identify pgtable level instead of *_SHIFT") > Signed-off-by: Kees Cook > --- > v2: Fixed the Fixes line. ;) > v1: https://lore.kernel.org/lkml/20250829154913.work.943-kees@kernel.org/ > Cc: Kevin Brodsky > Cc: Ard Biesheuvel > Cc: Ryan Roberts > Cc: Mark Rutland > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Anshuman Khandual > Cc: Oliver Upton > Cc: Yue Haibing > Cc: Marc Zyngier > Cc: Mark Brown > Cc: Andrew Morton > Cc: > --- > arch/arm64/include/asm/mmu.h | 7 +++++++ > arch/arm64/kernel/cpufeature.c | 5 +++-- > arch/arm64/mm/mmu.c | 7 ------- > 3 files changed, 10 insertions(+), 9 deletions(-) > > diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h > index 6e8aa8e72601..49f1a810df16 100644 > --- a/arch/arm64/include/asm/mmu.h > +++ b/arch/arm64/include/asm/mmu.h > @@ -17,6 +17,13 @@ > #include > #include > > +enum pgtable_type { > + TABLE_PTE, > + TABLE_PMD, > + TABLE_PUD, > + TABLE_P4D, > +}; Just noting that we now have "enum pgtable_level" in include/linux/pgtable.h that could at some point possibly be used here instead (not in this fix). -- Cheers David / dhildenb