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fs/mnt_idmapping.c: Return -EINVAL when no map is written
Currently, it is possible to create an idmapped mount using a user namespace without any mappings. However, this yields an idmapped mount that doesn't actually map the ids. With the following change, it will no longer be possible to create an idmapped mount when using a user namespace with no mappings, and will instead return EINVAL, an “invalid argument” error code. Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Taylor Jackson <taylor.a.jackson@me.com> Link: https://lore.kernel.org/r/20240208-mnt-idmap-inval-v2-1-58ef26d194e0@me.com Signed-off-by: Christian Brauner <brauner@kernel.org>
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@ -214,7 +214,7 @@ static int copy_mnt_idmap(struct uid_gid_map *map_from,
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* anything at all.
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* anything at all.
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*/
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*/
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if (nr_extents == 0)
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if (nr_extents == 0)
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return 0;
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return -EINVAL;
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/*
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/*
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* Here we know that nr_extents is greater than zero which means
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* Here we know that nr_extents is greater than zero which means
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