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

[Danilo Egea Gondolfo]

Public bug reported:

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

** Affects: libcap2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: update-excuse

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to libcap2 in Ubuntu.
https://bugs.launchpad.net/bugs/2003892

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libcap2/+bug/2003892/+subscriptions