[PATCH 5/9] riscv: kprobes: Implement alloc_insn_page()
From: Jisheng Zhang <hidden>
Date: 2021-03-29 18:30:12
Also in:
linux-riscv, lkml, netdev
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
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