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nfsd: auth: Fix gid sorting when rootsquash enabled 

commit 1995266727fa8143897e89b55f5d3c79aa828420 upstream.

Commit bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility
group_info allocators") appears to break nfsd rootsquash in a pretty
major way.

It adds a call to groups_sort() inside the loop that copies/squashes
gids, which means the valid gids are sorted along with the following
garbage.  The net result is that the highest numbered valid gids are
replaced with any lower-valued garbage gids, possibly including 0.

We should sort only once, after filling in all the gids.

Fixes: bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility ...")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Ben Hutchings 2018-01-22 20:11:06 +00:00 committed by syphyr
parent 079cf0277b
commit d8bfd2f23b
1 changed files with 3 additions and 3 deletions
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6
fs/nfsd/auth.c
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@ -61,10 +61,10 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
GROUP_AT(gi, i) = exp->ex_anon_gid;
else
GROUP_AT(gi, i) = GROUP_AT(rqgi, i);
/* Each thread allocates its own gi, no race */
groups_sort(gi);
}
/* Each thread allocates its own gi, no race */
groups_sort(gi);
} else {
gi = get_group_info(rqgi);
}