From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD33922060; Tue, 23 Jan 2024 01:56:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974963; cv=none; b=sDNni3qoAsKyGyJpI3zlAqD+QTICSG37TZo0WB0W+53AuQtaMQfwpd/iVdF6TwJKzJpDTNxiaMJzwaFTGGXM/FbYbH/UYP3BqrzL+MHAgutwfuF097ECPfj94w3wYmWPuShkWn9gNmGGSj5MHgbe6j5rVKhaD3xdx2KW1E1o/2s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974963; c=relaxed/simple; bh=kLB7FB1XPXgI9LuUwLGVHicJ1iTbR5aMotFWOiY0US8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OKbJPiggZnWOP9OC9p83f7T49WbLVuXbpEOtGZn0WryCsdkXGlHsrw27fvIolLZ5GLdms4sOrICNYF6YYCvnKYiIO+v/A0ixW6TnQdQwBGSrvfehQabDP8zkWRT0Qx4WDCfJyjcC94kgzSZsMlh6Mlnurx2uo20GTklee3jzG6M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lBPXq0sT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="lBPXq0sT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73655C433F1; Tue, 23 Jan 2024 01:56:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705974963; bh=kLB7FB1XPXgI9LuUwLGVHicJ1iTbR5aMotFWOiY0US8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lBPXq0sTFvm/mqKmjvxxfFjkfNaVrhPk35c1S9SVy0WwLieAyfp1LrOhu/eeiulLC FerIMaKGl/ntWHLsI1Ndp1fRsqnfIVRAHZXDaad0QGmsco+7CxDQ1Y/JnfY9a9M9XR kL/5jRGi9Jg9zpr5CezX1HYgnPkw2f3a59skyuao= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexandre Ghiti , Palmer Dabbelt , Sasha Levin Subject: [PATCH 5.15 298/374] riscv: Fix module_alloc() that did not reset the linear mapping permissions Date: Mon, 22 Jan 2024 15:59:14 -0800 Message-ID: <20240122235755.152313531@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235744.598274724@linuxfoundation.org> References: <20240122235744.598274724@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexandre Ghiti [ Upstream commit 749b94b08005929bbc636df21a23322733166e35 ] After unloading a module, we must reset the linear mapping permissions, see the example below: Before unloading a module: 0xffffaf809d65d000-0xffffaf809d6dc000 0x000000011d65d000 508K PTE . .. .. D A G . . W R V 0xffffaf809d6dc000-0xffffaf809d6dd000 0x000000011d6dc000 4K PTE . .. .. D A G . . . R V 0xffffaf809d6dd000-0xffffaf809d6e1000 0x000000011d6dd000 16K PTE . .. .. D A G . . W R V 0xffffaf809d6e1000-0xffffaf809d6e7000 0x000000011d6e1000 24K PTE . .. .. D A G . X . R V After unloading a module: 0xffffaf809d65d000-0xffffaf809d6e1000 0x000000011d65d000 528K PTE . .. .. D A G . . W R V 0xffffaf809d6e1000-0xffffaf809d6e7000 0x000000011d6e1000 24K PTE . .. .. D A G . X W R V The last mapping is not reset and we end up with WX mappings in the linear mapping. So add VM_FLUSH_RESET_PERMS to our module_alloc() definition. Fixes: 0cff8bff7af8 ("riscv: avoid the PIC offset of static percpu data in module beyond 2G limits") Signed-off-by: Alexandre Ghiti Link: https://lore.kernel.org/r/20231213134027.155327-2-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/kernel/module.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c index 4a48287513c3..24c3883c80d0 100644 --- a/arch/riscv/kernel/module.c +++ b/arch/riscv/kernel/module.c @@ -423,7 +423,8 @@ void *module_alloc(unsigned long size) { return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL, - PAGE_KERNEL, 0, NUMA_NO_NODE, + PAGE_KERNEL, VM_FLUSH_RESET_PERMS, + NUMA_NO_NODE, __builtin_return_address(0)); } #endif -- 2.43.0