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Fri, 30 Oct 2026 00:02:11 -0700 (PDT) Received: from localhost.localdomain ([78.40.184.2]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3acbbf31c35sm1413961fa.36.2026.10.30.00.02.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 00:02:11 -0700 (PDT) From: Roman Demidov To: stable@vger.kernel.org, Greg Kroah-Hartman Cc: Roman Demidov , Russell King , Mike Rapoport , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lvc-project@linuxtesting.org, Mike Rapoport , Yongqiang Liu , "Russell King (Oracle)" , Sasha Levin Subject: [PATCH 5.15/6.1 v3] ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses Date: Fri, 30 Oct 2026 10:01:51 +0300 Message-ID: <20261030070155.9857-1-roman.demidov.nn@gmail.com> X-Mailer: git-send-email 2.53.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Yongqiang Liu commit 0c66c6f4e21cb22220cbd8821c5c73fc157d20dc upstream. Since commit a4d5613c4dc6 ("arm: extend pfn_valid to take into account freed memory map alignment") changes the semantics of pfn_valid() to check presence of the memory map for a PFN. A valid page for an address which is reserved but not mapped by the kernel[1], the system crashed during some uio test with the following memory layout: node 0: [mem 0x00000000c0a00000-0x00000000cc8fffff] node 0: [mem 0x00000000d0000000-0x00000000da1fffff] the uio layout is：0xc0900000, 0x100000 the crash backtrace like: Unable to handle kernel paging request at virtual address bff00000 [...] CPU: 1 PID: 465 Comm: startapp.bin Tainted: G O 5.10.0 #1 Hardware name: Generic DT based system PC is at b15_flush_kern_dcache_area+0x24/0x3c LR is at __sync_icache_dcache+0x6c/0x98 [...] (b15_flush_kern_dcache_area) from (__sync_icache_dcache+0x6c/0x98) (__sync_icache_dcache) from (set_pte_at+0x28/0x54) (set_pte_at) from (remap_pfn_range+0x1a0/0x274) (remap_pfn_range) from (uio_mmap+0x184/0x1b8 [uio]) (uio_mmap [uio]) from (__mmap_region+0x264/0x5f4) (__mmap_region) from (__do_mmap_mm+0x3ec/0x440) (__do_mmap_mm) from (do_mmap+0x50/0x58) (do_mmap) from (vm_mmap_pgoff+0xfc/0x188) (vm_mmap_pgoff) from (ksys_mmap_pgoff+0xac/0xc4) (ksys_mmap_pgoff) from (ret_fast_syscall+0x0/0x5c) Code: e0801001 e2423001 e1c00003 f57ff04f (ee070f3e) ---[ end trace 09cf0734c3805d52 ]--- Kernel panic - not syncing: Fatal exception So check if PG_reserved was set to solve this issue. [1]: https://lore.kernel.org/lkml/Zbtdue57RO0QScJM@linux.ibm.com/ Fixes: a4d5613c4dc6 ("arm: extend pfn_valid to take into account freed memory map alignment") Suggested-by: Mike Rapoport Signed-off-by: Yongqiang Liu Signed-off-by: Russell King (Oracle) Signed-off-by: Sasha Levin [ Roman: folio_test_reserved() replaced by PageReserved() because commit 8b5989f33337 ("arm: implement the new page table range API") and folio infrastructure are not backported to this branch. ] Signed-off-by: Roman Demidov --- Backport fix for CVE-2024-26947 arch/arm/mm/flush.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 6d89db7895d1..ef848bf0df28 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -280,6 +280,9 @@ void __sync_icache_dcache(pte_t pteval) return; page = pfn_to_page(pfn); + if (PageReserved(page)) + return; + if (cache_is_vipt_aliasing()) mapping = page_mapping_file(page); else -- 2.53.0