[for_v23,v2,0/9] x86/sgx: Misc page related fixes

Message

Sean Christopherson Oct. 10, 2019, 11:20 p.m. UTC

Two critical bug fixes for a memory leak in sgx_encl_destroy() and a
livelock due to the EPC page free count getting corrupted.  The rest of
the patches are minor bug fixes and enhancements I collected in the
process of hunting down the livelock.

v2: Fully fix the memory leak, which was hilariously worse than originally
    thought.  Fun fact, the leak has existed since v18, i.e. nearly a year.

Sean Christopherson (9):
  x86/sgx: WARN once if an enclave is released with unfreed EPC pages
  x86/sgx: Do not EWB SECS if the enclave is dead
  x86/sgx: Fix a memory leak in sgx_encl_destroy()
  x86/sgx: WARN on any non-zero return from __eremove()
  x86/sgx: WARN only once if EREMOVE fails
  x86/sgx: Split second half of sgx_free_page() to a separate helper
  x86/sgx: Use the post-reclaim variant of __sgx_free_page()
  x86/sgx: Don't update free page count if EPC section allocation fails
  x86/sgx: Reinstate per EPC section free page counts

 arch/x86/kernel/cpu/sgx/encl.c    | 34 ++++++++++++-------
 arch/x86/kernel/cpu/sgx/ioctl.c   |  6 ++--
 arch/x86/kernel/cpu/sgx/main.c    | 54 ++++++++++++++++++++++---------
 arch/x86/kernel/cpu/sgx/reclaim.c | 25 +++++++-------
 arch/x86/kernel/cpu/sgx/sgx.h     | 19 ++++++++++-
 5 files changed, 96 insertions(+), 42 deletions(-)