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In the small window between strnlen_user() and copy_from_user() userspace could alter the terminating `\0' character. Signed-off-by: Davi Arnaut <[email protected]> Cc: David Howells <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>