]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
selftests/rseq: Play nice with binaries statically linked against glibc 2.35+
authorSean Christopherson <seanjc@google.com>
Fri, 21 Jul 2023 22:33:52 +0000 (15:33 -0700)
committerPaolo Bonzini <pbonzini@redhat.com>
Sat, 29 Jul 2023 15:05:28 +0000 (11:05 -0400)
commit3bcbc20942db5d738221cca31a928efc09827069
tree032fb1cd7c339c7006386df6a7a9bc10e35aced6
parentb439eb8ab578557263815ba8581d02c1b730e348
selftests/rseq: Play nice with binaries statically linked against glibc 2.35+

To allow running rseq and KVM's rseq selftests as statically linked
binaries, initialize the various "trampoline" pointers to point directly
at the expect glibc symbols, and skip the dlysm() lookups if the rseq
size is non-zero, i.e. the binary is statically linked *and* the libc
registered its own rseq.

Define weak versions of the symbols so as not to break linking against
libc versions that don't support rseq in any capacity.

The KVM selftests in particular are often statically linked so that they
can be run on targets with very limited runtime environments, i.e. test
machines.

Fixes: 233e667e1ae3 ("selftests/rseq: Uplift rseq selftests for compatibility with glibc-2.35")
Cc: Aaron Lewis <aaronlewis@google.com>
Cc: kvm@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20230721223352.2333911-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
tools/testing/selftests/rseq/rseq.c