[PATCH 0/2] KVM: selftests: guest_memfd close() fix and hardening

[Sean Christopherson <seanjc@google.com>]

Fix a bug where freeing a VM attempts to close an invalid guest_memfd instance
due to checking if a u32 value is non-negative.  Then harden closing of fds in
kvm_util by invalidating fds after they are closed, e.g. so that freeing an fd
multiple times will fail instead of silently closing the wrong file.

Sean Christopherson (2):
  KVM: selftests: Cast guest_memfd fd to a signed int when checking for
    >= 0
  KVM: selftests: Add and use kvm_free_fd() to harden against fd goofs

 .../selftests/kvm/include/kvm_syscalls.h      |  6 +++++
 tools/testing/selftests/kvm/lib/kvm_util.c    | 25 +++++++++----------
 2 files changed, 18 insertions(+), 13 deletions(-)


base-commit: 66939c1603bd5579e63278f9dc72cba5b79da9b5
-- 
2.54.0.794.g4f17f83d09-goog