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ebf8934652
freebsd-dev/libexec/rtld-elf
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Ed Maste ebf8934652 rtld: do not rely on a populated GOT on amd64 
On rela architectures GNU BFD ld and gold store the relocation addend
in GOT entries (in addition to the relocation's r_addend field).
rtld previously relied on this to access its own _DYNAMIC symbol in
order to apply its own relocations.

However, recording addends in the GOT is not specified by the ABI,
and some versions of LLVM's LLD linker leave the GOT uninitialized on
rela architectures.

BFD ld does not populate the GOT on sparc64, and sparc64 rtld has a
machine-dependent rtld_dynamic_addr() function that returns the
_DYNAMIC address. Use the same approach on amd64, obtaining the %rip-
relative _DYNAMIC address following a suggestion from Rafael Espíndola.

Architectures other than amd64 should be addressed in future work.

PR:		214972
Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D9180
2017-01-16 14:49:29 +00:00
..
aarch64 Retire long-broken/unused static rtld support 2016-12-02 14:23:26 +00:00
amd64 rtld: do not rely on a populated GOT on amd64 2017-01-16 14:49:29 +00:00
arm Adjust r308689 to make rtld compilable with either in-tree or 2016-11-21 14:13:57 +00:00
i386 Adjust r308689 to make rtld compilable with either in-tree or 2016-11-21 14:13:57 +00:00
mips Fix _mips_rtld_bind() to handle ELF filters. 2016-11-23 20:21:53 +00:00
powerpc Adjust r308689 to make rtld compilable with either in-tree or 2016-11-21 14:13:57 +00:00
powerpc64 Adjust r308689 to make rtld compilable with either in-tree or 2016-11-21 14:13:57 +00:00
riscv Retire long-broken/unused static rtld support 2016-12-02 14:23:26 +00:00
sparc64 Retire long-broken/unused static rtld support 2016-12-02 14:23:26 +00:00
tests DIRDEPS_BUILD: Add some missing dirctories to the build. 2016-08-31 19:30:59 +00:00
debug.c Do not call callbacks for dl_iterate_phdr(3) with the rtld bind and 2016-01-20 07:21:33 +00:00
debug.h Remove historical GNUC test 2015-05-06 15:29:11 +00:00
libmap.c Rather than using the #define for path names, indirect through a char * 2015-10-31 04:39:55 +00:00
libmap.h Make the directory mapping functionality, which was previously only 2013-09-21 21:03:52 +00:00
Makefile Assert that there is no unresolved symbols during rtld linking. 2016-11-15 09:40:03 +00:00
Makefile.depend new depends 2015-06-16 23:37:19 +00:00
malloc.c libexec: minor spelling fixes in comments. 2016-05-01 19:39:23 +00:00
map_object.c Fix handling of DT_TEXTREL for an object with more than one read-only 2016-03-02 16:36:24 +00:00
paths.h Convert casperd(8) daemon to the libcasper. 2016-02-25 18:23:40 +00:00
rtld_lock.c Fix acquisition of nested write compat rtld locks. 2017-01-10 19:26:55 +00:00
rtld_lock.h Change compiler setting to make default visibility of the symbols for 2015-03-29 18:53:21 +00:00
rtld_printf.c Add the LD_LIBRARY_PATH_FDS environmental variable. 2014-06-20 17:08:32 +00:00
rtld_printf.h Add the LD_LIBRARY_PATH_FDS environmental variable. 2014-06-20 17:08:32 +00:00
rtld_tls.h Change compiler setting to make default visibility of the symbols for 2015-03-29 18:53:21 +00:00
rtld_utrace.h Move defines common between rtld and libsysdecode into the header, 2016-08-12 19:31:41 +00:00
rtld.1 mdoc: remove superfluous paragraph macros. 2014-06-23 18:40:21 +00:00
rtld.c For the main binary, postpone enforcing relro read-only protection 2017-01-12 15:54:03 +00:00
rtld.h rtld: Ensure that dlopen() cannot obtain a reference on a doomed object. 2016-12-22 17:41:32 +00:00
Symbol.map Add rtld private interface for dso to detect dynamic loading 2015-01-03 18:09:53 +00:00
xmalloc.c Increase alignment to size of pointer if the alignment is too small. 2014-02-22 11:06:48 +00:00