Isn't joining an existing PAG just Wrong? I can see how it would be
convenient to do certain thing, but are you really supposed to be doing
those things? This seems like a back door to me. -- Todd Lewis
Christopher Allen Wing wrote:
Yep, this is due to the fact that linux 2.6 now supports an arbitrary
number of supplemental groups (instead of the fixed array in earlier
versions).
I had various similar hacks in the past that also broke.
I think if you want to make this work you might consider writing a
kernel module or something that just modifies the group list directly.
Or you could propose a cross-platform interface for OpenAFS to offer a
means of joining existing PAGs.
-Chris Wing
[EMAIL PROTECTED]
On Fri, 14 Jul 2006, David Thompson wrote:
I have a "pag manager" I'm trying to migrate from linux 2.4 to linux
2.6, and
I seem to have hit a wall.
The manager's function is to select an appropriate (preexisting) pag
based on
the user's identity, cause it to become the pag for the current process,
and exec a target program.
Under linux 2.4, if I happened to know the group IDs for a given pag,
sample
code like the following allowed a euid=0 process to acquire that pag:
int joinpag (int g0, int g1)
{
int res, ngroups;
gid_t grouplist[NGROUPS_MAX];
if ((ngroups = getgroups (NGROUPS_MAX, grouplist))<0) { return -1; }
grouplist[0] = (gid_t)g0;
grouplist[1] = (gid_t)g1;
if ((res = setgroups (ngroups, grouplist)) < 0) { return -2; }
return 0;
}
If I try this with a 2.6 kernel, the groups g0 and g1 end up at the
_end_ of
the groups list, and the original pag remains active.
Have other people run into this? Is there an alternative method to
joining an
existing pag?
Thanks in advance.
Dave Thompson
UW-Madison
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