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When creating a file inside a directory that has the setgid flag set, give the new file the group ID of the parent, and also the setgid flag if it is a directory itself. Link: http://lkml.kernel.org/r/20171204192705.GA6101@debian.home Signed-off-by: Ernesto A. Fernandez <ernesto.mnd.fernandez@gmail.com> Reviewed-by: Vyacheslav Dubeyko <slava@dubeyko.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>