What's the memory region with r--p permission of a shared library?

[Dongping84]

Hi,

When I checked the /proc/pid/maps, I found that there was a memory region with r--p access permission for every shared libraries. As far as I know, the memory region with r-xp corresponds to the text segment, and the memory region with with rw-p corresponds to the data segment, so what's this r--p memory region???

...
0065d000-00660000 r-xp 00000000 fd:00 375        /lib/libdl-2.11.1.so
00660000-00661000 r--p 00002000 fd:00 375        /lib/libdl-2.11.1.so
00661000-00662000 rw-p 00003000 fd:00 375        /lib/libdl-2.11.1.so
0073c000-00746000 r-xp 00000000 fd:00 10699      /lib/libnss_nis-2.11.1.so
00746000-00747000 r--p 00009000 fd:00 10699      /lib/libnss_nis-2.11.1.so
00747000-00748000 rw-p 0000a000 fd:00 10699      /lib/libnss_nis-2.11.1.so
...

[Dongping84]

Does anyone know it?