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namespace-util: add helper to get base UID from userns

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This commit is contained in:
Lennart Poettering
2025-01-07 23:55:34 +01:00
parent 5b14690a39
commit 3d57b6692f
5 changed files with 142 additions and 6 deletions
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src/basic/uid-range.c
+42 -6
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@@ -186,9 +186,6 @@ int uid_map_read_one(FILE *f, uid_t *ret_base, uid_t *ret_shift, uid_t *ret_rang
int r;
assert(f);
assert(ret_base);
assert(ret_shift);
assert(ret_range);
errno = 0;
r = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT "\n", &uid_base, &uid_shift, &uid_range);
@@ -197,10 +194,15 @@ int uid_map_read_one(FILE *f, uid_t *ret_base, uid_t *ret_shift, uid_t *ret_rang
assert(r >= 0);
if (r != 3)
return -EBADMSG;
if (uid_range <= 0)
return -EBADMSG;
*ret_base = uid_base;
*ret_shift = uid_shift;
*ret_range = uid_range;
if (ret_base)
*ret_base = uid_base;
if (ret_shift)
*ret_shift = uid_shift;
if (ret_range)
*ret_range = uid_range;
return 0;
}
@@ -360,3 +362,37 @@ bool uid_range_equal(const UIDRange *a, const UIDRange *b) {
return true;
}
int uid_map_search_root(pid_t pid, const char *filename, uid_t *ret) {
int r;
assert(pid_is_valid(pid));
assert(filename);
const char *p = procfs_file_alloca(pid, filename);
_cleanup_fclose_ FILE *f = fopen(p, "re");
if (!f) {
if (errno != ENOENT)
return -errno;
r = proc_mounted();
if (r < 0)
return -ENOENT; /* original error, if we can't determine /proc/ state */
return r ? -ENOPKG : -ENOSYS;
}
for (;;) {
uid_t uid_base = UID_INVALID, uid_shift = UID_INVALID;
r = uid_map_read_one(f, &uid_base, &uid_shift, /* ret_uid_range= */ NULL);
if (r < 0)
return r;
if (uid_base == 0) {
if (ret)
*ret = uid_shift;
return 0;
}
}
}