- fix parsing of BIND_NOW with older readelf
- add _IO_stdin_used to ignored exports
For details see: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#109
- add check-symbols and check-security make targets
These are not added to the default checks because some of them depend on
release-build configs.
- always link librt for glibc back-compat builds
glibc absorbed clock_gettime in 2.17. librt (its previous location) is safe to
link in anyway for back-compat.
Fixes#7420
- add security/symbol checks to gitian
Github-Pull: #7424
Rebased-From: cd27bf51e06a8d79790a631696355bd05751b0aa 475813ba5b208eb9a5d027eb628a717cc123ef4f f3d3eaf78eb51238d799d8f20a585550d1567719 a8ce872118c4807465629aecb9e4f3d72d999ccb a81c87fafce43e49cc2307947e3951b84be7ca9a
Perform the following ELF security checks:
- PIE: Check for position independent executable (PIE), allowing for address space randomization
- NX: Check that no sections are writable and executable (including the stack)
- RELRO: Check for read-only relocations, binding at startup
- Canary: Check for use of stack canary
Also add a check to symbol-check.py that checks that only the subset of
allowed libraries is imported (to avoid incompatibilities).
