[Bug 2003892] Re: libcap2 seems to not work correctly when linked with -Bsymbolic-functions

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~danilogondolfo/ubuntu/+source/libcap2/+git/libcap2/+merge/436344

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Title:
  libcap2 seems to not work correctly when linked with -Bsymbolic-
  functions

Status in libcap2 package in Ubuntu:
  New

Bug description:
  Ubuntu will include -Wl,-Bsymbolic-functions in the build flags by
  default. This option seems to break libcap2.

  One of the autopkgtests that is supposed to prevent an exploitation
  instance using capabilities fails:
  https://autopkgtest.ubuntu.com/results/autopkgtest-
  lunar/lunar/amd64/libc/libcap2/20230123_094238_95088@/log.gz

  The solution is to exclude this flag from the set of flags:

  debian/rules:
  export DEB_LDFLAGS_MAINT_STRIP = -Wl,-Bsymbolic-functions

  Debian seems to not be affected by that as they don't include this
  flag in their build:
  https://buildd.debian.org/status/fetch.php?pkg=libcap2&arch=amd64&ver=1%3A2.66-3&stamp=1671660323&raw=0

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