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riscv: kprobes: Implement alloc_insn_page()

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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>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Jisheng Zhang 2021-03-30 02:24:21 +08:00 committed by Palmer Dabbelt
parent 300f62c37d
commit cdd1b2bd35
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1 changed files with 8 additions and 0 deletions
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8
arch/riscv/kernel/probes/kprobes.c
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@ -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)
{