forked from MarcoBuster/Magisk
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
#include <libfdt.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "magiskboot.h"
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#include "utils.h"
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static void print_props(const void *fdt, int node, int depth) {
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int prop;
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fdt_for_each_property_offset(prop, fdt, node) {
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for (int i = 0; i < depth; ++i) printf(" ");
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printf(" ");
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int size;
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const char *name;
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const char *value = fdt_getprop_by_offset(fdt, prop, &name, &size);
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printf("[%s]: [%s]\n", name, value);
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}
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}
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static void print_subnode(const void *fdt, int parent, int depth) {
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int node;
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fdt_for_each_subnode(node, fdt, parent) {
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for (int i = 0; i < depth; ++i) printf(" ");
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printf("#%d: %s\n", node, fdt_get_name(fdt, node, NULL));
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print_props(fdt, node, depth);
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print_subnode(fdt, node, depth + 1);
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}
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}
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static int find_fstab(const void *fdt, int parent) {
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int node, fstab;
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fdt_for_each_subnode(node, fdt, parent) {
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if (strcmp(fdt_get_name(fdt, node, NULL), "fstab") == 0)
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return node;
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fstab = find_fstab(fdt, node);
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if (fstab != -1)
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return fstab;
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}
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return -1;
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}
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static void dtb_dump(const char *file) {
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size_t size ;
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void *dtb, *fdt;
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fprintf(stderr, "Loading dtbs from [%s]\n", file);
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mmap_ro(file, &dtb, &size);
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// Loop through all the dtbs
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int dtb_num = 0;
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for (int i = 0; i < size; ++i) {
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if (memcmp(dtb + i, DTB_MAGIC, 4) == 0) {
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fdt = dtb + i;
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fprintf(stderr, "Dumping dtb.%04d\n", dtb_num++);
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print_subnode(fdt, 0, 0);
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}
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}
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fprintf(stderr, "\n");
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munmap(dtb, size);
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exit(0);
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}
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static void dtb_patch(const char *file, int patch) {
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size_t size ;
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void *dtb, *fdt;
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fprintf(stderr, "Loading dtbs from [%s]\n", file);
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if (patch)
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mmap_rw(file, &dtb, &size);
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else
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mmap_ro(file, &dtb, &size);
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// Loop through all the dtbs
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int dtb_num = 0, found = 0;
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for (int i = 0; i < size; ++i) {
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if (memcmp(dtb + i, DTB_MAGIC, 4) == 0) {
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fdt = dtb + i;
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int fstab = find_fstab(fdt, 0);
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if (fstab > 0) {
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fprintf(stderr, "Found fstab in dtb.%04d\n", dtb_num++);
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int block;
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fdt_for_each_subnode(block, fdt, fstab) {
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fprintf(stderr, "Found block [%s] in fstab\n", fdt_get_name(fdt, block, NULL));
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uint32_t value_size;
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void *value = (void *) fdt_getprop(fdt, block, "fsmgr_flags", &value_size);
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if (patch) {
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void *dup = xmalloc(value_size);
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memcpy(dup, value, value_size);
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memset(value, 0, value_size);
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found |= patch_verity(&dup, &value_size, 1);
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memcpy(value, dup, value_size);
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free(dup);
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} else {
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found |= patch_verity(&value, &value_size, 0);
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}
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}
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}
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}
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}
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munmap(dtb, size);
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exit(!found);
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}
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int dtb_commands(const char *cmd, int argc, char *argv[]) {
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if (argc == 0) return 1;
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if (strcmp(cmd, "dump") == 0)
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dtb_dump(argv[0]);
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else if (strcmp(cmd, "patch") == 0)
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dtb_patch(argv[0], 1);
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else if (strcmp(cmd, "test") == 0)
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dtb_patch(argv[0], 0);
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return 0;
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}
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