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Message-ID: <20210413001738.20c8b2e0@xhacker>
Date: Tue, 13 Apr 2021 00:17:38 +0800
From: Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
To: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
Alexander Potapenko <glider@...gle.com>,
Andrey Konovalov <andreyknvl@...il.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
" Björn Töpel" <bjorn@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Luke Nelson <luke.r.nels@...il.com>,
Xi Wang <xi.wang@...il.com>, Anup Patel <anup@...infault.org>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 06/10] riscv: kprobes: Implement alloc_insn_page()
From: Jisheng Zhang <jszhang@...nel.org>
Allocate PAGE_KERNEL_READ_EXEC(read only, executable) page for kprobes
insn page. This is to prepare for STRICT_MODULE_RWX.
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
Reviewed-by: Anup Patel <anup@...infault.org>
---
arch/riscv/kernel/probes/kprobes.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
index 7e2c78e2ca6b..8c1f7a30aeed 100644
--- a/arch/riscv/kernel/probes/kprobes.c
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -84,6 +84,14 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
return 0;
}
+void *alloc_insn_page(void)
+{
+ return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
+ GFP_KERNEL, PAGE_KERNEL_READ_EXEC,
+ VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
+ __builtin_return_address(0));
+}
+
/* install breakpoint in text */
void __kprobes arch_arm_kprobe(struct kprobe *p)
{
--
2.31.0
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