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| author | Jisheng Zhang <jszhang@kernel.org> | 2021-03-29 20:24:21 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-04-26 17:25:11 +0200 |
| commit | cdd1b2bd358ffda2638fe18ff47191e84e18525f (patch) | |
| tree | 085cee5bcf1449b889da7d91fcd83fccdbbd7e6e /arch/riscv | |
| parent | riscv: Constify sbi_ipi_ops (diff) | |
| download | linux-cdd1b2bd358ffda2638fe18ff47191e84e18525f.tar.xz linux-cdd1b2bd358ffda2638fe18ff47191e84e18525f.zip | |
riscv: kprobes: Implement alloc_insn_page()
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>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kernel/probes/kprobes.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c index a2ec18662fee..0b451ff76d55 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) { |