This is the mail archive of the
glibc-bugs@sourceware.org
mailing list for the glibc project.
[Bug libc/14578] fchmodat(..., AT_SYMLINK_NOFOLLOW) returns ENOTSUP on non-symlinks
- From: "bugdal at aerifal dot cx" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Thu, 13 Sep 2012 23:16:43 +0000
- Subject: [Bug libc/14578] fchmodat(..., AT_SYMLINK_NOFOLLOW) returns ENOTSUP on non-symlinks
- Auto-submitted: auto-generated
- References: <bug-14578-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=14578
--- Comment #6 from Rich Felker <bugdal at aerifal dot cx> 2012-09-13 23:16:43 UTC ---
Joseph, you're right; actually, I was unfortunately testing on a pre-O_PATH
kernel and didn't notice this, so I can't say for sure yet whether the code
does what's desired on a new kernel with O_PATH. I can confirm your fear about
older kernels though; the kernel happily opens the underlying file, which could
be bad if it's a device file, etc. In order to test for working O_PATH, one
could first open "/" with O_PATH and attempt to call getdents on the resulting
fd. Assuming the open succeeded, that would work if and only if O_PATH support
is missing. If the open failed due to missing permissions, that would also mean
O_PATH support is missing. If it failed for another reason, we probably have a
resource exhaustion issue and can just pass the error up.
--
Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.