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

[Danilo Egea Gondolfo]

The problem is reproducible on Focal (kernel 5.4) in an armhf LXD
container. The armhf architecture seems to be the only one using hosts
with kernel 5.4. I believe the best approach is to skip only the test
that is failing rather than the entire test script. So we will need to
patch d/t/upstream-root. Once we upgrade the hosts used for armhf tests
we can drop the patch.

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

Status in libcap2 package in Ubuntu:
  In Progress

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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