• Sasha Levin's avatar
    vfs: read file_handle only once in handle_to_path · 161f873b
    Sasha Levin authored
    We used to read file_handle twice.  Once to get the amount of extra
    bytes, and once to fetch the entire structure.
    This may be problematic since we do size verifications only after the
    first read, so if the number of extra bytes changes in userspace between
    the first and second calls, we'll have an incoherent view of
    Instead, read the constant size once, and copy that over to the final
    structure without having to re-read it again.
    Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
fhandle.c 6.47 KB