Messages in this thread Patch in this message | | | Date | Thu, 1 Apr 2021 00:27:24 +0800 | From | Jisheng Zhang <> | Subject | [PATCH v2 5/9] riscv: kprobes: Implement alloc_insn_page() |
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From: Jisheng Zhang <jszhang@kernel.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@kernel.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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