MarcoBuster/Magisk
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Fix random return value of faccessat() in x86

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faccessat() should return 0 when success, but it returns random number with errno == 0 in x86 platform.

It’s a side effect of commit bf80b08b5f when magisk binaries ‘corretly’ linked with library of API16 .. lol

Co-authored-by: John Wu <topjohnwu@gmail.com>
This commit is contained in:
Shaka Huang 2021-04-04 18:04:09 +08:00 committed by GitHub
parent dfe1f2c108
commit 3da318b48e
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 16 additions and 1 deletions
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2
native/jni/utils/files.cpp
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@ -108,7 +108,7 @@ void mv_dir(int src, int dest) {
for (dirent *entry; (entry = xreaddir(dir.get()));) {
switch (entry->d_type) {
case DT_DIR:
if (faccessat(dest, entry->d_name, F_OK, 0) == 0) {
if (xfaccessat(dest, entry->d_name) == 0) {
// Destination folder exists, needs recursive move
int newsrc = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
int newdest = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);

14
native/jni/utils/xwrap.cpp
View File

@ -359,6 +359,20 @@ ssize_t xreadlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz) {
#endif
}
int xfaccessat(int dirfd, const char *pathname) {
int ret = faccessat(dirfd, pathname, F_OK, 0);
if (ret < 0) {
PLOGE("faccessat %s", pathname);
}
#if defined(__i386__) || defined(__x86_64__)
if (ret > 0 && errno == 0) {
LOGD("faccessat success but ret is %d\n", ret);
ret = 0;
}
#endif
return ret;
}
int xsymlink(const char *target, const char *linkpath) {
int ret = symlink(target, linkpath);
if (ret < 0) {

1
native/jni/utils/xwrap.hpp
View File

@ -42,6 +42,7 @@ int xdup2(int oldfd, int newfd);
int xdup3(int oldfd, int newfd, int flags);
ssize_t xreadlink(const char *pathname, char *buf, size_t bufsiz);
ssize_t xreadlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
int xfaccessat(int dirfd, const char *pathname);
int xsymlink(const char *target, const char *linkpath);
int xsymlinkat(const char *target, int newdirfd, const char *linkpath);
int xlinkat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath, int flags);