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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
687 lines
18 KiB
C
687 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2008 Michael Ellerman, IBM Corporation.
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/cpuhotplug.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/page.h>
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#include <asm/code-patching.h>
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#include <asm/setup.h>
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static int __patch_instruction(unsigned int *exec_addr, unsigned int instr,
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unsigned int *patch_addr)
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{
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int err = 0;
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__put_user_asm(instr, patch_addr, err, "stw");
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if (err)
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return err;
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asm ("dcbst 0, %0; sync; icbi 0,%1; sync; isync" :: "r" (patch_addr),
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"r" (exec_addr));
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return 0;
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}
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int raw_patch_instruction(unsigned int *addr, unsigned int instr)
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{
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return __patch_instruction(addr, instr, addr);
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}
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#ifdef CONFIG_STRICT_KERNEL_RWX
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static DEFINE_PER_CPU(struct vm_struct *, text_poke_area);
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static int text_area_cpu_up(unsigned int cpu)
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{
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struct vm_struct *area;
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area = get_vm_area(PAGE_SIZE, VM_ALLOC);
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if (!area) {
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WARN_ONCE(1, "Failed to create text area for cpu %d\n",
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cpu);
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return -1;
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}
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this_cpu_write(text_poke_area, area);
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return 0;
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}
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static int text_area_cpu_down(unsigned int cpu)
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{
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free_vm_area(this_cpu_read(text_poke_area));
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return 0;
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}
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/*
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* Run as a late init call. This allows all the boot time patching to be done
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* simply by patching the code, and then we're called here prior to
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* mark_rodata_ro(), which happens after all init calls are run. Although
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* BUG_ON() is rude, in this case it should only happen if ENOMEM, and we judge
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* it as being preferable to a kernel that will crash later when someone tries
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* to use patch_instruction().
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*/
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static int __init setup_text_poke_area(void)
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{
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BUG_ON(!cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
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"powerpc/text_poke:online", text_area_cpu_up,
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text_area_cpu_down));
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return 0;
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}
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late_initcall(setup_text_poke_area);
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/*
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* This can be called for kernel text or a module.
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*/
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static int map_patch_area(void *addr, unsigned long text_poke_addr)
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{
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unsigned long pfn;
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int err;
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if (is_vmalloc_addr(addr))
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pfn = vmalloc_to_pfn(addr);
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else
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pfn = __pa_symbol(addr) >> PAGE_SHIFT;
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err = map_kernel_page(text_poke_addr, (pfn << PAGE_SHIFT), PAGE_KERNEL);
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pr_devel("Mapped addr %lx with pfn %lx:%d\n", text_poke_addr, pfn, err);
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if (err)
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return -1;
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return 0;
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}
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static inline int unmap_patch_area(unsigned long addr)
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{
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pte_t *ptep;
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pmd_t *pmdp;
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pud_t *pudp;
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pgd_t *pgdp;
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pgdp = pgd_offset_k(addr);
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if (unlikely(!pgdp))
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return -EINVAL;
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pudp = pud_offset(pgdp, addr);
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if (unlikely(!pudp))
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return -EINVAL;
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pmdp = pmd_offset(pudp, addr);
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if (unlikely(!pmdp))
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return -EINVAL;
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ptep = pte_offset_kernel(pmdp, addr);
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if (unlikely(!ptep))
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return -EINVAL;
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pr_devel("clearing mm %p, pte %p, addr %lx\n", &init_mm, ptep, addr);
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/*
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* In hash, pte_clear flushes the tlb, in radix, we have to
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*/
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pte_clear(&init_mm, addr, ptep);
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flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
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return 0;
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}
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static int do_patch_instruction(unsigned int *addr, unsigned int instr)
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{
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int err;
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unsigned int *patch_addr = NULL;
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unsigned long flags;
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unsigned long text_poke_addr;
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unsigned long kaddr = (unsigned long)addr;
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/*
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* During early early boot patch_instruction is called
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* when text_poke_area is not ready, but we still need
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* to allow patching. We just do the plain old patching
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*/
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if (!this_cpu_read(text_poke_area))
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return raw_patch_instruction(addr, instr);
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local_irq_save(flags);
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text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr;
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if (map_patch_area(addr, text_poke_addr)) {
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err = -1;
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goto out;
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}
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patch_addr = (unsigned int *)(text_poke_addr) +
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((kaddr & ~PAGE_MASK) / sizeof(unsigned int));
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__patch_instruction(addr, instr, patch_addr);
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err = unmap_patch_area(text_poke_addr);
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if (err)
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pr_warn("failed to unmap %lx\n", text_poke_addr);
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out:
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local_irq_restore(flags);
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return err;
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}
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#else /* !CONFIG_STRICT_KERNEL_RWX */
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static int do_patch_instruction(unsigned int *addr, unsigned int instr)
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{
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return raw_patch_instruction(addr, instr);
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}
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#endif /* CONFIG_STRICT_KERNEL_RWX */
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int patch_instruction(unsigned int *addr, unsigned int instr)
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{
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/* Make sure we aren't patching a freed init section */
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if (init_mem_is_free && init_section_contains(addr, 4)) {
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pr_debug("Skipping init section patching addr: 0x%px\n", addr);
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return 0;
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}
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return do_patch_instruction(addr, instr);
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}
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NOKPROBE_SYMBOL(patch_instruction);
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int patch_branch(unsigned int *addr, unsigned long target, int flags)
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{
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return patch_instruction(addr, create_branch(addr, target, flags));
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}
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bool is_offset_in_branch_range(long offset)
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{
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/*
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* Powerpc branch instruction is :
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*
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* 0 6 30 31
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* +---------+----------------+---+---+
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* | opcode | LI |AA |LK |
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* +---------+----------------+---+---+
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* Where AA = 0 and LK = 0
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*
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* LI is a signed 24 bits integer. The real branch offset is computed
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* by: imm32 = SignExtend(LI:'0b00', 32);
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*
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* So the maximum forward branch should be:
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* (0x007fffff << 2) = 0x01fffffc = 0x1fffffc
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* The maximum backward branch should be:
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* (0xff800000 << 2) = 0xfe000000 = -0x2000000
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*/
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return (offset >= -0x2000000 && offset <= 0x1fffffc && !(offset & 0x3));
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}
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/*
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* Helper to check if a given instruction is a conditional branch
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* Derived from the conditional checks in analyse_instr()
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*/
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bool is_conditional_branch(unsigned int instr)
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{
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unsigned int opcode = instr >> 26;
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if (opcode == 16) /* bc, bca, bcl, bcla */
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return true;
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if (opcode == 19) {
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switch ((instr >> 1) & 0x3ff) {
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case 16: /* bclr, bclrl */
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case 528: /* bcctr, bcctrl */
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case 560: /* bctar, bctarl */
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return true;
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}
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}
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return false;
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}
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NOKPROBE_SYMBOL(is_conditional_branch);
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unsigned int create_branch(const unsigned int *addr,
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unsigned long target, int flags)
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{
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unsigned int instruction;
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long offset;
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offset = target;
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if (! (flags & BRANCH_ABSOLUTE))
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offset = offset - (unsigned long)addr;
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/* Check we can represent the target in the instruction format */
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if (!is_offset_in_branch_range(offset))
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return 0;
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/* Mask out the flags and target, so they don't step on each other. */
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instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC);
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return instruction;
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}
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unsigned int create_cond_branch(const unsigned int *addr,
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unsigned long target, int flags)
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{
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unsigned int instruction;
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long offset;
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offset = target;
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if (! (flags & BRANCH_ABSOLUTE))
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offset = offset - (unsigned long)addr;
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/* Check we can represent the target in the instruction format */
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if (offset < -0x8000 || offset > 0x7FFF || offset & 0x3)
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return 0;
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/* Mask out the flags and target, so they don't step on each other. */
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instruction = 0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC);
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return instruction;
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}
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static unsigned int branch_opcode(unsigned int instr)
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{
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return (instr >> 26) & 0x3F;
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}
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static int instr_is_branch_iform(unsigned int instr)
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{
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return branch_opcode(instr) == 18;
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}
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static int instr_is_branch_bform(unsigned int instr)
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{
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return branch_opcode(instr) == 16;
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}
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int instr_is_relative_branch(unsigned int instr)
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{
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if (instr & BRANCH_ABSOLUTE)
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return 0;
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return instr_is_branch_iform(instr) || instr_is_branch_bform(instr);
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}
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int instr_is_relative_link_branch(unsigned int instr)
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{
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return instr_is_relative_branch(instr) && (instr & BRANCH_SET_LINK);
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}
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static unsigned long branch_iform_target(const unsigned int *instr)
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{
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signed long imm;
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imm = *instr & 0x3FFFFFC;
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/* If the top bit of the immediate value is set this is negative */
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if (imm & 0x2000000)
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imm -= 0x4000000;
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if ((*instr & BRANCH_ABSOLUTE) == 0)
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imm += (unsigned long)instr;
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return (unsigned long)imm;
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}
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static unsigned long branch_bform_target(const unsigned int *instr)
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{
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signed long imm;
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imm = *instr & 0xFFFC;
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/* If the top bit of the immediate value is set this is negative */
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if (imm & 0x8000)
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imm -= 0x10000;
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if ((*instr & BRANCH_ABSOLUTE) == 0)
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imm += (unsigned long)instr;
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return (unsigned long)imm;
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}
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unsigned long branch_target(const unsigned int *instr)
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{
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if (instr_is_branch_iform(*instr))
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return branch_iform_target(instr);
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else if (instr_is_branch_bform(*instr))
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return branch_bform_target(instr);
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return 0;
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}
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int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr)
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{
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if (instr_is_branch_iform(*instr) || instr_is_branch_bform(*instr))
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return branch_target(instr) == addr;
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return 0;
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}
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unsigned int translate_branch(const unsigned int *dest, const unsigned int *src)
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{
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unsigned long target;
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target = branch_target(src);
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if (instr_is_branch_iform(*src))
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return create_branch(dest, target, *src);
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else if (instr_is_branch_bform(*src))
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return create_cond_branch(dest, target, *src);
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return 0;
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}
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#ifdef CONFIG_PPC_BOOK3E_64
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void __patch_exception(int exc, unsigned long addr)
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{
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extern unsigned int interrupt_base_book3e;
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unsigned int *ibase = &interrupt_base_book3e;
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/* Our exceptions vectors start with a NOP and -then- a branch
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* to deal with single stepping from userspace which stops on
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* the second instruction. Thus we need to patch the second
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* instruction of the exception, not the first one
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*/
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patch_branch(ibase + (exc / 4) + 1, addr, 0);
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}
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#endif
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#ifdef CONFIG_CODE_PATCHING_SELFTEST
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static void __init test_trampoline(void)
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{
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asm ("nop;\n");
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}
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#define check(x) \
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if (!(x)) printk("code-patching: test failed at line %d\n", __LINE__);
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static void __init test_branch_iform(void)
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{
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unsigned int instr;
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unsigned long addr;
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addr = (unsigned long)&instr;
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/* The simplest case, branch to self, no flags */
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check(instr_is_branch_iform(0x48000000));
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/* All bits of target set, and flags */
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check(instr_is_branch_iform(0x4bffffff));
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/* High bit of opcode set, which is wrong */
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check(!instr_is_branch_iform(0xcbffffff));
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/* Middle bits of opcode set, which is wrong */
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check(!instr_is_branch_iform(0x7bffffff));
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/* Simplest case, branch to self with link */
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check(instr_is_branch_iform(0x48000001));
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/* All bits of targets set */
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check(instr_is_branch_iform(0x4bfffffd));
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/* Some bits of targets set */
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check(instr_is_branch_iform(0x4bff00fd));
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/* Must be a valid branch to start with */
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check(!instr_is_branch_iform(0x7bfffffd));
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/* Absolute branch to 0x100 */
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instr = 0x48000103;
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check(instr_is_branch_to_addr(&instr, 0x100));
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/* Absolute branch to 0x420fc */
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instr = 0x480420ff;
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check(instr_is_branch_to_addr(&instr, 0x420fc));
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/* Maximum positive relative branch, + 20MB - 4B */
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instr = 0x49fffffc;
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check(instr_is_branch_to_addr(&instr, addr + 0x1FFFFFC));
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/* Smallest negative relative branch, - 4B */
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instr = 0x4bfffffc;
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check(instr_is_branch_to_addr(&instr, addr - 4));
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/* Largest negative relative branch, - 32 MB */
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instr = 0x4a000000;
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check(instr_is_branch_to_addr(&instr, addr - 0x2000000));
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/* Branch to self, with link */
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instr = create_branch(&instr, addr, BRANCH_SET_LINK);
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check(instr_is_branch_to_addr(&instr, addr));
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/* Branch to self - 0x100, with link */
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instr = create_branch(&instr, addr - 0x100, BRANCH_SET_LINK);
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check(instr_is_branch_to_addr(&instr, addr - 0x100));
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/* Branch to self + 0x100, no link */
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instr = create_branch(&instr, addr + 0x100, 0);
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check(instr_is_branch_to_addr(&instr, addr + 0x100));
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/* Maximum relative negative offset, - 32 MB */
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instr = create_branch(&instr, addr - 0x2000000, BRANCH_SET_LINK);
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check(instr_is_branch_to_addr(&instr, addr - 0x2000000));
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/* Out of range relative negative offset, - 32 MB + 4*/
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instr = create_branch(&instr, addr - 0x2000004, BRANCH_SET_LINK);
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check(instr == 0);
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/* Out of range relative positive offset, + 32 MB */
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instr = create_branch(&instr, addr + 0x2000000, BRANCH_SET_LINK);
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check(instr == 0);
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/* Unaligned target */
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instr = create_branch(&instr, addr + 3, BRANCH_SET_LINK);
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check(instr == 0);
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/* Check flags are masked correctly */
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instr = create_branch(&instr, addr, 0xFFFFFFFC);
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check(instr_is_branch_to_addr(&instr, addr));
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check(instr == 0x48000000);
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}
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static void __init test_create_function_call(void)
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{
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unsigned int *iptr;
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unsigned long dest;
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/* Check we can create a function call */
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iptr = (unsigned int *)ppc_function_entry(test_trampoline);
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dest = ppc_function_entry(test_create_function_call);
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patch_instruction(iptr, create_branch(iptr, dest, BRANCH_SET_LINK));
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check(instr_is_branch_to_addr(iptr, dest));
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}
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static void __init test_branch_bform(void)
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{
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unsigned long addr;
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unsigned int *iptr, instr, flags;
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iptr = &instr;
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addr = (unsigned long)iptr;
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/* The simplest case, branch to self, no flags */
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check(instr_is_branch_bform(0x40000000));
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/* All bits of target set, and flags */
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check(instr_is_branch_bform(0x43ffffff));
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/* High bit of opcode set, which is wrong */
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check(!instr_is_branch_bform(0xc3ffffff));
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/* Middle bits of opcode set, which is wrong */
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check(!instr_is_branch_bform(0x7bffffff));
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/* Absolute conditional branch to 0x100 */
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instr = 0x43ff0103;
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check(instr_is_branch_to_addr(&instr, 0x100));
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/* Absolute conditional branch to 0x20fc */
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instr = 0x43ff20ff;
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check(instr_is_branch_to_addr(&instr, 0x20fc));
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/* Maximum positive relative conditional branch, + 32 KB - 4B */
|
|
instr = 0x43ff7ffc;
|
|
check(instr_is_branch_to_addr(&instr, addr + 0x7FFC));
|
|
/* Smallest negative relative conditional branch, - 4B */
|
|
instr = 0x43fffffc;
|
|
check(instr_is_branch_to_addr(&instr, addr - 4));
|
|
/* Largest negative relative conditional branch, - 32 KB */
|
|
instr = 0x43ff8000;
|
|
check(instr_is_branch_to_addr(&instr, addr - 0x8000));
|
|
|
|
/* All condition code bits set & link */
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|
flags = 0x3ff000 | BRANCH_SET_LINK;
|
|
|
|
/* Branch to self */
|
|
instr = create_cond_branch(iptr, addr, flags);
|
|
check(instr_is_branch_to_addr(&instr, addr));
|
|
|
|
/* Branch to self - 0x100 */
|
|
instr = create_cond_branch(iptr, addr - 0x100, flags);
|
|
check(instr_is_branch_to_addr(&instr, addr - 0x100));
|
|
|
|
/* Branch to self + 0x100 */
|
|
instr = create_cond_branch(iptr, addr + 0x100, flags);
|
|
check(instr_is_branch_to_addr(&instr, addr + 0x100));
|
|
|
|
/* Maximum relative negative offset, - 32 KB */
|
|
instr = create_cond_branch(iptr, addr - 0x8000, flags);
|
|
check(instr_is_branch_to_addr(&instr, addr - 0x8000));
|
|
|
|
/* Out of range relative negative offset, - 32 KB + 4*/
|
|
instr = create_cond_branch(iptr, addr - 0x8004, flags);
|
|
check(instr == 0);
|
|
|
|
/* Out of range relative positive offset, + 32 KB */
|
|
instr = create_cond_branch(iptr, addr + 0x8000, flags);
|
|
check(instr == 0);
|
|
|
|
/* Unaligned target */
|
|
instr = create_cond_branch(iptr, addr + 3, flags);
|
|
check(instr == 0);
|
|
|
|
/* Check flags are masked correctly */
|
|
instr = create_cond_branch(iptr, addr, 0xFFFFFFFC);
|
|
check(instr_is_branch_to_addr(&instr, addr));
|
|
check(instr == 0x43FF0000);
|
|
}
|
|
|
|
static void __init test_translate_branch(void)
|
|
{
|
|
unsigned long addr;
|
|
unsigned int *p, *q;
|
|
void *buf;
|
|
|
|
buf = vmalloc(PAGE_ALIGN(0x2000000 + 1));
|
|
check(buf);
|
|
if (!buf)
|
|
return;
|
|
|
|
/* Simple case, branch to self moved a little */
|
|
p = buf;
|
|
addr = (unsigned long)p;
|
|
patch_branch(p, addr, 0);
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
q = p + 1;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
|
|
/* Maximum negative case, move b . to addr + 32 MB */
|
|
p = buf;
|
|
addr = (unsigned long)p;
|
|
patch_branch(p, addr, 0);
|
|
q = buf + 0x2000000;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
check(*q == 0x4a000000);
|
|
|
|
/* Maximum positive case, move x to x - 32 MB + 4 */
|
|
p = buf + 0x2000000;
|
|
addr = (unsigned long)p;
|
|
patch_branch(p, addr, 0);
|
|
q = buf + 4;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
check(*q == 0x49fffffc);
|
|
|
|
/* Jump to x + 16 MB moved to x + 20 MB */
|
|
p = buf;
|
|
addr = 0x1000000 + (unsigned long)buf;
|
|
patch_branch(p, addr, BRANCH_SET_LINK);
|
|
q = buf + 0x1400000;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
|
|
/* Jump to x + 16 MB moved to x - 16 MB + 4 */
|
|
p = buf + 0x1000000;
|
|
addr = 0x2000000 + (unsigned long)buf;
|
|
patch_branch(p, addr, 0);
|
|
q = buf + 4;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
|
|
|
|
/* Conditional branch tests */
|
|
|
|
/* Simple case, branch to self moved a little */
|
|
p = buf;
|
|
addr = (unsigned long)p;
|
|
patch_instruction(p, create_cond_branch(p, addr, 0));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
q = p + 1;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
|
|
/* Maximum negative case, move b . to addr + 32 KB */
|
|
p = buf;
|
|
addr = (unsigned long)p;
|
|
patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC));
|
|
q = buf + 0x8000;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
check(*q == 0x43ff8000);
|
|
|
|
/* Maximum positive case, move x to x - 32 KB + 4 */
|
|
p = buf + 0x8000;
|
|
addr = (unsigned long)p;
|
|
patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC));
|
|
q = buf + 4;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
check(*q == 0x43ff7ffc);
|
|
|
|
/* Jump to x + 12 KB moved to x + 20 KB */
|
|
p = buf;
|
|
addr = 0x3000 + (unsigned long)buf;
|
|
patch_instruction(p, create_cond_branch(p, addr, BRANCH_SET_LINK));
|
|
q = buf + 0x5000;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
|
|
/* Jump to x + 8 KB moved to x - 8 KB + 4 */
|
|
p = buf + 0x2000;
|
|
addr = 0x4000 + (unsigned long)buf;
|
|
patch_instruction(p, create_cond_branch(p, addr, 0));
|
|
q = buf + 4;
|
|
patch_instruction(q, translate_branch(q, p));
|
|
check(instr_is_branch_to_addr(p, addr));
|
|
check(instr_is_branch_to_addr(q, addr));
|
|
|
|
/* Free the buffer we were using */
|
|
vfree(buf);
|
|
}
|
|
|
|
static int __init test_code_patching(void)
|
|
{
|
|
printk(KERN_DEBUG "Running code patching self-tests ...\n");
|
|
|
|
test_branch_iform();
|
|
test_branch_bform();
|
|
test_create_function_call();
|
|
test_translate_branch();
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(test_code_patching);
|
|
|
|
#endif /* CONFIG_CODE_PATCHING_SELFTEST */
|