src/libexec, branch release/8.0.0

MFC r197931:

2009-10-20T13:26:58Z

Apply relocations for PIE binary ELF data structures pointers in rtld. Approved by: re (kensmith)

MFC r196787

2009-09-07T14:10:55Z

Do the first step in removing lukemftpd from the base system. Disconnect it from the build. If you are using the FTP daemon, please consider using the port ftp/tnftpd which is the same FTP server, but newer and might have more/better functionality. This results in us providing only one ftp daemon by default. Reviewed by: bz Approved by: imp (mentor, implicit) MFC after: 3 days Silence from: obrien Approved by: re (kib), imp (mentor, implicit)

Implement RTLD_NOLOAD flag for dlopen(3).

2009-07-17T19:45:42Z

Requested and tested by: jkim Reviewed by: kan Approved by: re (kensmith)

Only perform .bss mapping and cleaning operations when segment file size

2009-07-17T19:32:04Z

is not equal to its memory size. This eliminates unneeded clearing of the text segment that often happens due to text end not being page-aligned. For instance, $ readelf -l /lib/libedit.so.6 Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align LOAD 0x000000 0x00000000 0x00000000 0x139e1 0x139e1 R E 0x1000 LOAD 0x014000 0x00014000 0x00014000 0x00f04 0x00f14 RW 0x1000 DYNAMIC 0x014cc4 0x00014cc4 0x00014cc4 0x000d0 0x000d0 RW 0x4 $ procstat -v $$ (for /bin/sh) 68585 0x28097000 0x280aa000 r-x 6 0 21 14 CN vn /lib/libedit.so.6 68585 0x280aa000 0x280ab000 r-x 1 0 1 0 CN vn /lib/libedit.so.6 <== 68585 0x280ab000 0x280ac000 rwx 1 0 1 0 CN vn /lib/libedit.so.6 Note the splitted map entry marked by '<=='. Reviewed by: kan Approved by: re (kensmith) MFC after: 1 month

Second attempt at eliminating .text relocations in shared libraries

2009-07-14T21:19:13Z

compiled with stack protector. Use libssp_nonshared library to pull __stack_chk_fail_local symbol into each library that needs it instead of pulling it from libc. GCC generates local calls to this function which result in absolute relocations put into position-independent code segment, making dynamic loader do extra work every time given shared library is being relocated and making affected text pages non-shareable. Reviewed by: kib Approved by: re (kib)

Back out previous revision until better tested fix is ready.

2009-06-29T01:33:59Z

Approved by: re (impliciti, by approving previos check-in)

Eliminate .text relocations in shared libraries compiled with stack protector.

2009-06-28T23:51:39Z

Use libssp_nonshared library to pull __stack_chk_fail_local symbol into each library that needs it instead of pulling it from libc. GCC generates local calls to this function which result in absolute relocations put into position-independent code segment, making dynamic loader do extra work everys time given shared library is being relocated and making affected text pages non-shareable. Reviewed by: kib Approved by: re (kensmith)

Fix a typo in the same comment, one line below.

2009-06-23T14:12:49Z

Submitted by: bf1783 googlemail com

Fix typo in comment.

2009-06-23T09:50:50Z

Submitted by: Christoph Mallon

Allow order of initialization of loaded shared objects to be

2009-06-20T14:16:41Z

altered through their .init code. This might happen if init vector calls dlopen on its own and that dlopen causes some not yet initialized object to be initialized earlier as part of that dlopened DAG. Do not reset module reference counts to zero on final fini vector run when process is exiting. Just add an additional parameter to force fini vector invocation regardless of current reference count value if object was not destructed yet. This allows dlclose called from fini vector to proceed normally instead of failing with handle validation error. Reviewed by: kib Reported by: venki kaps