From 10d5e97c1bf816facbc7c431c6caf47ee35fc1ed Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 25 Jun 2020 20:30:43 -0700
Subject: [PATCH] arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page
Use PAGE_KERNEL_ROX directly instead of allocating RWX and setting the
page read-only just after the allocation.
Link: http://lkml.kernel.org/r/20200618064307.32739-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/arm64/kernel/probes/kprobes.c | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index d1c95dcf1d783..cbe49cd117cfe 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -120,15 +120,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
void *alloc_insn_page(void)
{
- void *page;
-
- page = vmalloc_exec(PAGE_SIZE);
- if (page) {
- set_memory_ro((unsigned long)page, 1);
- set_vm_flush_reset_perms(page);
- }
-
- return page;
+ return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
+ GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS,
+ NUMA_NO_NODE, __func__);
}
/* arm kprobe: install breakpoint in text */
--
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