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| author | fanquake <fanquake@gmail.com> | 2019-12-17 15:58:55 -0500 |
|---|---|---|
| committer | fanquake <fanquake@gmail.com> | 2019-12-17 16:32:18 -0500 |
| commit | 47f45b677653c496a40acff00d11bd0e175ee058 (patch) | |
| tree | bdf6fe54382ecd807aed818eb3b756c18df4d400 | |
| parent | ab4e6ad7629430d02d101417e010228c1099f0ae (diff) | |
| parent | c78b123982d59fe2d633659f23d6893de627f3f6 (diff) | |
Merge #17686: build: add -bind_at_load to macOS hardened LDFLAGS
c78b123982d59fe2d633659f23d6893de627f3f6 build: add -bind_at_load to hardened LDFLAGS (fanquake)
Pull request description:
This performs the same function as `-Wl,-z,now`, except for ld on macOS.
You can check the binaries using `otool -l`, and looking for the `LC_DYLD_INFO_ONLY` section; `lazy_bind_off` and `lazy_bind_size` should both be 0.
This seems to be the case with our current release binaries. However we can make the check, and applying the flag explicit in configure.
man ld:
```bash
-bind_at_load
Sets a bit in the mach header of the resulting binary which tells dyld
to bind all symbols when the binary is loaded, rather than lazily.
```
TODO:
- [ ] Follow up with `MH_BINDATLOAD` flag.
ACKs for top commit:
theuni:
ACK c78b123982d59fe2d633659f23d6893de627f3f6.
Tree-SHA512: 12259558b84f7e3d75d6fcde63b517685e42b18fcf8e8cfcf347483c5ba089d3b4b6d330e7b7f61f83a328fe4d141b771e8e52ddee9cac6da87dfc073ab1183d
| -rw-r--r-- | configure.ac | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index b8cb4f2812..0df416ae3b 100644 --- a/configure.ac +++ b/configure.ac @@ -778,6 +778,7 @@ dnl this flag screws up non-darwin gcc even when the check fails. special-case i if test x$TARGET_OS = xdarwin; then AX_CHECK_LINK_FLAG([[-Wl,-dead_strip]], [LDFLAGS="$LDFLAGS -Wl,-dead_strip"]) AX_CHECK_LINK_FLAG([[-Wl,-dead_strip_dylibs]], [LDFLAGS="$LDFLAGS -Wl,-dead_strip_dylibs"]) + AX_CHECK_LINK_FLAG([[-Wl,-bind_at_load]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-bind_at_load"]) fi AC_CHECK_HEADERS([endian.h sys/endian.h byteswap.h stdio.h stdlib.h unistd.h strings.h sys/types.h sys/stat.h sys/select.h sys/prctl.h sys/sysctl.h vm/vm_param.h sys/vmmeter.h sys/resources.h]) |