Commit Graph

7 Commits

Author SHA1 Message Date
Rich Felker 368ba4a0a9 keep track of which dsos have been relocated 2011-06-25 00:18:19 -04:00
Rich Felker b7f6e0c6f8 prepare support for LD_LIBRARY_PATH (checking suid/sgid safety)
the use of this test will be much stricter than glibc and other
typical implementations; the environment will not be honored
whatsoever unless the program is confirmed non-suid/sgid by the aux
vector the kernel passed in. no fallback to slow syscall-based
checking is used if the kernel fails to provide the information; we
simply assume the worst (suid) in this case and refuse to honor
environment.
2011-06-23 22:04:06 -04:00
Rich Felker d19adeec52 make ldso asm more uniform with rest of codebase (no unnecessary suffixes) 2011-06-19 22:42:10 -04:00
Rich Felker 779165e6d4 x86_64: ensure that dtor pointer passed to app is 0 so it won't be used
leaving it uninitialized caused unpredictable crashes or worse due to
calling an indeterminate function pointer.
2011-06-19 08:33:27 -04:00
Rich Felker 596d60c565 dynamic linker 64bit fix: hash table entries are always 32bit 2011-06-18 22:52:01 -04:00
Rich Felker 51e2d83102 experimental dynamic linker!
some notes:
- library search path is hard coded
- x86_64 code is untested and may not work
- dlopen/dlsym is not yet implemented
- relocations in read-only memory won't work
2011-06-18 19:48:42 -04:00
Rich Felker 41d518360f various changes in preparation for dynamic linking support
prefer using visibility=hidden for __libc internal data, rather than
an accessor function, if the compiler has visibility.

optimize with -O3 for PIC targets (shared library). without heavy
inlining, reloading the GOT register in small functions kills
performance. 20-30% size increase for a single libc.so is not a big
deal, compared to comparaible size increase in every static binaries.

use -Bsymbolic-functions, not -Bsymbolic. global variables are subject
to COPY relocations, and thus binding their addresses in the library
at link time will cause library functions to read the wrong (original)
copies instead of the copies made in the main program's bss section.

add entry point, _start, for dynamic linker.
2011-02-24 16:37:21 -05:00