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arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page

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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>
This commit is contained in:
Christoph Hellwig 2020-06-25 20:30:43 -07:00 • committed by Linus Torvalds
parent 800e26b813
commit 10d5e97c1b
1 changed files with 3 additions and 9 deletions
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12
arch/arm64/kernel/probes/kprobes.c
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@ -120,15 +120,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
void *alloc_insn_page(void) void *alloc_insn_page(void)
{ {
void *page; return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS,
page = vmalloc_exec(PAGE_SIZE); NUMA_NO_NODE, __func__);
if (page) {
set_memory_ro((unsigned long)page, 1);
set_vm_flush_reset_perms(page);
}
return page;
} }
/* arm kprobe: install breakpoint in text */ /* arm kprobe: install breakpoint in text */