user namespace: Add function that checks if the UID map is defined
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I49KW1 CVE: NA -------------------------------- Add function that checks if the UID map is defined. It will be used by ima to check if ID remapping in subject-based rules is necessary. Signed-off-by: NKrzysztof Struczynski <krzysztof.struczynski@huawei.com> Reviewed-by: NZhang Tianxing <zhangtianxing3@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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