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MaxsTechReview
b9dbd006be
* fix(storage): Windows installs on a natively mounted card no longer ask for an administrator Cards mounted directly as FAT, exFAT or NTFS were not treated as Android storage, so wineserver reported an Anonymous owner and refused permission changes. Its chmod on these volumes also no longer fails the request. * fix(storage): keep NTFS owners and the chmod error
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <errno.h>
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#include <limits.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <unistd.h>
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#define FUSE_MAGIC 0x65735546
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#define SDCARDFS_MAGIC 0x5dca2df5
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#define FAT_MAGIC 0x4d44
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#define EXFAT_MAGIC 0x2011bab0
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static int is_wineserver(void) {
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static int cached = -1;
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char exe[PATH_MAX];
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const char *base;
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ssize_t n;
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if (cached >= 0) return cached;
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n = readlink("/proc/self/exe", exe, sizeof(exe) - 1);
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if (n <= 0) {
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cached = 0;
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return cached;
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}
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exe[n] = '\0';
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base = strrchr(exe, '/');
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cached = strcmp(base ? base + 1 : exe, "wineserver") == 0;
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return cached;
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}
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static int has_no_unix_owner(int fd) {
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struct statfs fs;
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if (fstatfs(fd, &fs) != 0) return 0;
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return fs.f_type == FUSE_MAGIC || fs.f_type == SDCARDFS_MAGIC || fs.f_type == FAT_MAGIC ||
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(unsigned int)fs.f_type == EXFAT_MAGIC;
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}
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__attribute__((visibility("hidden")))
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void bl_storage_owner(int fd, struct stat *st) {
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int saved = errno;
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uid_t uid;
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if (st != NULL && is_wineserver()) {
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uid = getuid();
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if (st->st_uid != uid && has_no_unix_owner(fd)) st->st_uid = uid;
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}
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errno = saved;
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}
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int fchmod(int fd, mode_t mode) {
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static int (*next_fchmod)(int, mode_t);
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int saved = errno, result;
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if (next_fchmod == NULL) next_fchmod = dlsym(RTLD_NEXT, "fchmod");
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if (next_fchmod == NULL) {
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errno = ENOSYS;
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return -1;
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}
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result = next_fchmod(fd, mode);
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if (result != 0 && errno == EPERM && is_wineserver()) {
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if (has_no_unix_owner(fd)) {
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errno = saved;
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return 0;
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}
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errno = EPERM;
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}
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return result;
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}
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