From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793213694; b=d0ixZhm3PBCOlp/wHm3DtmNzITS43ylBhbIWJ78WdOHRuUN4xHm2JnbXTgGPT7d/DwGo EswwQMv9bPEcyHTynBzGboRU8fHjAuNSpI2XAKA2GG85k6R1wfjO7sxOqVufgpZ4lDo6c IxvRt+dG3WFDya9/MZtEGgRhEr9fOxDpPv4ijykRDmUdZDgqWMxsX2foxZ60TFYTXL9kl saeqSyfoTW2Y7r3Q+3RJ3W4kuc57Hr9vu7NoYTB0wqTLR9OPxKfE2M947muv6mq1PsG8o G4ufMj21InfKjauxN4t62p7QPDPN4MBkGtjIQxcbNI142DB1Rncf4b+Uuyzq9PmmAGw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793213694; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=eL5obuI8WSwCGy2SZvpBHMK+CYe0aYu1tlyzOkyOn14=; b=Aw06UYNtp3XKptvoedYcNNEB3l6dBee6aUbNKl0Of82dS9umdeMKmBFkFGmcmZEITtrl 2zOlGL+7rz4vKzcIarpwgPf9AFw0cTzeV3+acCBojl7Exhcsb8DQMVoRTQDjq7Jgnsi9e ajGF7mnJXBK76fAnwW61YihvvkWib04yEg9CiCzVOOjP56GeD4N5Hg9OgpGfBTTQ1SupW NbIoz2Qq12x1Eini/Ew1hHX9S5iI100woOB44IXkGtLRkIzF20iDao0SRgR0ZN+tcdzy3 AYL4amNUTg1g1BsFhvDikJC7MIBic4mscO8iXNKKAl44BbstpYIyQtx9z1IsoffKmLA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=mAWCj5t9; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D127E606A31F; Wed, 28 Oct 2026 18:54:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=mAWCj5t9 Received: by smtp.kernel.org (Postfix) with ESMTPSA id F17BF1F01825; Wed, 28 Oct 2026 18:54:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793213693; bh=eL5obuI8WSwCGy2SZvpBHMK+CYe0aYu1tlyzOkyOn14=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mAWCj5t9fLR3GsYZOjd1XZxo1Bui/vBYpUKn7oQBdRRIbtzDplVacAiey+QzSV8/c NLuiJx1HwghyAACp1rVky52KyhBmvWecGpqF+PrctKq8D9gzk4VPnP6Z+ddlCn/+Yo B701u+apJVEgpGrRQpdV94cySYmvaJ7xgcYtsnCI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mike Rapoport , Yongqiang Liu , "Russell King (Oracle)" , Sasha Levin Subject: [PATCH 6.1 0596/1887] ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses Date: Wed, 28 Oct 2026 17:44:52 +0100 Message-ID: <20261028170512.979747687@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170459.200466217@linuxfoundation.org> References: <20261028170459.200466217@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev 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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yongqiang Liu [ Upstream commit 0c66c6f4e21cb22220cbd8821c5c73fc157d20dc ] 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 --- arch/arm/mm/flush.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 7ff9feea13a6a..b19ecc307ad46 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -280,6 +280,8 @@ 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