I have a piece of code that checks for access to a non-root user to perform a
recursive chown operation on a directory with its child directory having 0
permissions(all permission bits set to zero)
It uses the` fts_info` flags of FTSENT structure returned by fts_read().For
s390x architecture(big endian), it is seen that the value of fts_info for the
unreadable directory is set as 6 (FTS_DP) corresponding to postorder directory
instead of 6 (FTS_DNR) which is an Unreadable directory . For x86 architecture
(little endian), expected behaviour is observed as fts_info is FTS_DNR.
Architecture: s390x
Version: 8.25-2ubuntu2
Here is the test code
os::mkdir("one/two"));
os::chmod("one/two", 0));
// Recursive chown should now fail to fully recurse due to
// the lack of permission on "one/two".
EXPECT_ERROR(os::chown(uid.get(), gid.get(), "one", true));
EXPECT_ERROR(os::chown(uid.get(), gid.get(), "one/two", true));
I am using fts_info for the above test as shown below
char* path_[] = {const_cast<char*>(path.c_str()), nullptr};
FTS* tree = ::fts_open(
path_, FTS_NOCHDIR | FTS_PHYSICAL, nullptr);
if (tree == nullptr) {
return ErrnoError();
}
FTSENT *node;
while ((node = ::fts_read(tree)) != nullptr) {
switch (node->fts_info) {
Best,
Prajakta Bhatekar <prajakta_bhate...@persistent.com>
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