#include <linux/kernel.h>#include <linux/kprobes.h>#include <linux/stop_machine.h> #include <asm/cacheflush.h>#include <asm/smp_plat.h>#include <asm/opcodes.h> #include "patch.h" struct patch { void *addr; unsigned int insn;}; void __kprobes __patch_text(void *addr, unsigned int insn){ bool thumb2 = IS_ENABLED(CONFIG_THUMB2_KERNEL); int size; if (thumb2 && __opcode_is_thumb16(insn)) { *(u16 *)addr = __opcode_to_mem_thumb16(insn); size = sizeof(u16); } else if (thumb2 && ((uintptr_t)addr & 2)) { u16 first = __opcode_thumb32_first(insn); u16 second = __opcode_thumb32_second(insn); u16 *addrh = addr; addrh[0] = __opcode_to_mem_thumb16(first); addrh[1] = __opcode_to_mem_thumb16(second); size = sizeof(u32); } else { if (thumb2) insn = __opcode_to_mem_thumb32(insn); else insn = __opcode_to_mem_arm(insn); *(u32 *)addr = insn; size = sizeof(u32); } flush_icache_range((uintptr_t)(addr), (uintptr_t)(addr) + size);} static int __kprobes patch_text_stop_machine(void *data){ struct patch *patch = data; __patch_text(patch->addr, patch->insn); return 0;} void __kprobes patch_text(void *addr, unsigned int insn){ struct patch patch = { .addr = addr, .insn = insn, }; if (cache_ops_need_broadcast()) { stop_machine(patch_text_stop_machine, &patch, cpu_online_mask); } else { bool straddles_word = IS_ENABLED(CONFIG_THUMB2_KERNEL) && __opcode_is_thumb32(insn) && ((uintptr_t)addr & 2); if (straddles_word) stop_machine(patch_text_stop_machine, &patch, NULL); else __patch_text(addr, insn); }}
#include <linux/kernel.h>
#include <linux/kprobes.h>
#include <linux/stop_machine.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/opcodes.h>
#include "patch.h"
struct patch {
void *addr;
unsigned int insn;
};
void __kprobes __patch_text(void *addr, unsigned int insn)
{
bool thumb2 = IS_ENABLED(CONFIG_THUMB2_KERNEL);
int size;
if (thumb2 && __opcode_is_thumb16(insn)) {
*(u16 *)addr = __opcode_to_mem_thumb16(insn);
size = sizeof(u16);
} else if (thumb2 && ((uintptr_t)addr & 2)) {
u16 first = __opcode_thumb32_first(insn);
u16 second = __opcode_thumb32_second(insn);
u16 *addrh = addr;
addrh[0] = __opcode_to_mem_thumb16(first);
addrh[1] = __opcode_to_mem_thumb16(second);
size = sizeof(u32);
} else {
if (thumb2)
insn = __opcode_to_mem_thumb32(insn);
else
insn = __opcode_to_mem_arm(insn);
*(u32 *)addr = insn;
size = sizeof(u32);
}
flush_icache_range((uintptr_t)(addr),
(uintptr_t)(addr) + size);
}
static int __kprobes patch_text_stop_machine(void *data)
{
struct patch *patch = data;
__patch_text(patch->addr, patch->insn);
return 0;
}
void __kprobes patch_text(void *addr, unsigned int insn)
{
struct patch patch = {
.addr = addr,
.insn = insn,
};
if (cache_ops_need_broadcast()) {
stop_machine(patch_text_stop_machine, &patch, cpu_online_mask);
} else {
bool straddles_word = IS_ENABLED(CONFIG_THUMB2_KERNEL)
&& __opcode_is_thumb32(insn)
&& ((uintptr_t)addr & 2);
if (straddles_word)
stop_machine(patch_text_stop_machine, &patch, NULL);
else
__patch_text(addr, insn);
}
}