Re: fatal: Could not get current working directory: Permission denied | affected 2.10,2.11,2.12, but not 1.9.5 |

From: René Scharfe <l.s.r@web.de>
Date: Mar 21, 2017, 19:04 UTC
Message-ID: <3e8b756c-81bd-0a29-e032-d5733a8b3ed0@web.de>
In-Reply-To: <bcrjmkhdzucyoncxqruj@gkuh>

Am 21.03.2017 um 14:29 schrieb Zenobiusz Kunegunda:

Show 10 quoted lines

> I think I found a way to reproduce this error.
> I installed FreeBSD 10.3 under qemu with zfs partitioning.
> Test program did not report any access errors.
> Then I did chmod 711 /usr/home
> Now program started reporting permission denied errors just like this:
>    $ ./a.out
>    len = 0, errno = 22, Invalid argument
>    len = 1, errno = 34, Result too large
>    len = 2, errno = 13, Permission denied
>    len = 20, errno = 0, No error: 0

Yes, and I think we can take ZFS out of the equation. As a regular user I get this with UFS and for $mode values of 000, 100 or 400 (with umask 0022):

	$ mkdir -p /tmp/a/b && cd /tmp/a/b

	$ chmod $mode /tmp/a && getcwdtest
	len = 0, errno = 22, Invalid argument
	len = 1, errno = 34, Result too large
	len = 2, errno = 13, Permission denied
	len = 9, errno = 0, No error: 0

Only with both read and execute/search permissions for the intermediate directory I get rid of that irritating permission error for small buffers:

	$ chmod 500 /tmp/a && getcwdtest
	len = 0, errno = 22, Invalid argument
	len = 1, errno = 34, Result too large
	len = 9, errno = 0, No error: 0

So a workaround for you would be to run "chmod a+rx" (or similar) against all parent directories of your repository. Another one would be to keep the path length below 128 characters (that's the initial buffer size in strbuf_getcwd()).

Have you been able to test the patch I sent on Friday by any chance?

Thanks, René