mirror of
https://github.com/topjohnwu/Magisk.git
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67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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#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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/* Left here for debugging */
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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_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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void dtb_patch(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\n", file);
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mmap_rw(file, &dtb, &size);
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// Loop through all the dtbs
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int dtb_num = 0, patched = 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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int skip, value_size;
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char *value = (char *) fdt_getprop(fdt, block, "fsmgr_flags", &value_size);
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for (int i = 0; i < value_size; ++i) {
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if ((skip = check_verity_pattern(value + i)) > 0) {
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fprintf(stderr, "Remove pattern [%.*s] in [fsmgr_flags]\n", skip, value + i);
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memcpy(value + i, value + i + skip, value_size - i - skip);
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memset(value + value_size - skip, '\0', skip);
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patched = 1;
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}
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}
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}
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}
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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(!patched);
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}
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