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Fix potential crash when traversing cpio entries

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This commit is contained in:
topjohnwu 2019-09-22 06:15:19 -04:00
parent 748a35774f
commit 0fcd0de0d1
1 changed files with 12 additions and 15 deletions
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25
native/jni/magiskboot/ramdisk.cpp
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@ -44,11 +44,8 @@ void magisk_cpio::patch() {
fprintf(stderr, "Patch with flag KEEPVERITY=[%s] KEEPFORCEENCRYPT=[%s]\n",
keepverity ? "true" : "false", keepforceencrypt ? "true" : "false");
auto next = entries.begin();
decltype(next) cur;
while (next != entries.end()) {
cur = next;
++next;
for (auto it = entries.begin(); it != entries.end();) {
auto cur = it++;
bool fstab = (!keepverity || !keepforceencrypt) &&
!str_starts(cur->first, ".backup") &&
str_contains(cur->first, "fstab") && S_ISREG(cur->second->mode);
@ -140,19 +137,19 @@ for (str = (char *) buf; str < (char *) buf + size; str = str += strlen(str) + 1
void magisk_cpio::restore() {
decompress();
if (auto it = entries.find(".backup/.rmlist"); it != entries.end()) {
char *file;
auto next = entries.begin();
decltype(next) cur;
while (next != entries.end()) {
cur = next;
++next;
for_each_str(file, it->second->data, it->second->filesize)
rm(file, false);
rm(it);
}
for (auto it = entries.begin(); it != entries.end();) {
auto cur = it++;
if (str_starts(cur->first, ".backup")) {
if (cur->first.length() == 7 || cur->first.substr(8) == ".magisk") {
rm(cur);
} else if (cur->first.substr(8) == ".rmlist") {
for_each_str(file, cur->second->data, cur->second->filesize)
rm(file, false);
rm(cur);
} else {
mv(cur, &cur->first[8]);
}