nfsd: auth: Fix gid sorting when rootsquash enabled
Commitbdcf0a423e
("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:bdcf0a423e
("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>
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a0ec1ded22
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1995266727
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@ -60,10 +60,10 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
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gi->gid[i] = exp->ex_anon_gid;
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else
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gi->gid[i] = rqgi->gid[i];
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/* Each thread allocates its own gi, no race */
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groups_sort(gi);
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}
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/* Each thread allocates its own gi, no race */
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groups_sort(gi);
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} else {
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gi = get_group_info(rqgi);
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}
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