linux-kernel - [PATCH 2/2] x86/modules: Make x86 allocs to flush when free

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Message-Id: <20181128000754.18056-3-rick.p.edgecombe@intel.com>
Date:   Tue, 27 Nov 2018 16:07:54 -0800
From:   Rick Edgecombe <rick.p.edgecombe@...el.com>
To:     akpm@...ux-foundation.org, luto@...nel.org, will.deacon@....com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com,
        naveen.n.rao@...ux.vnet.ibm.com, anil.s.keshavamurthy@...el.com,
        davem@...emloft.net, mhiramat@...nel.org, rostedt@...dmis.org,
        mingo@...hat.com, ast@...nel.org, daniel@...earbox.net,
        jeyu@...nel.org, netdev@...r.kernel.org, ard.biesheuvel@...aro.org,
        jannh@...gle.com
Cc:     kristen@...ux.intel.com, dave.hansen@...el.com,
        deneen.t.dock@...el.com,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: [PATCH 2/2] x86/modules: Make x86 allocs to flush when free

Change the module allocations to flush before freeing the pages.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
 arch/x86/kernel/module.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index b052e883dd8c..1694daf256b3 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -87,8 +87,8 @@ void *module_alloc(unsigned long size)
 	p = __vmalloc_node_range(size, MODULE_ALIGN,
 				    MODULES_VADDR + get_module_load_offset(),
 				    MODULES_END, GFP_KERNEL,
-				    PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
-				    __builtin_return_address(0));
+				    PAGE_KERNEL_EXEC, VM_IMMEDIATE_UNMAP,
+				    NUMA_NO_NODE, __builtin_return_address(0));
 	if (p && (kasan_module_alloc(p, size) < 0)) {
 		vfree(p);
 		return NULL;
-- 
2.17.1