Resending this with latest rebases. Now we have at least x86 support for ARCH_HAS_REFCOUNT merged and arm and others on their way. Changes in v4: * just rebase and corrections on linux-next/master Changes in v3: * SoB chain corrected * minor corrections based on v2 feedback * rebase on linux-next/master as of today Changes in v2: * dropped already merged patches * rebase on top of linux-next/master * Now by default refcount_t = atomic_t (*) and uses all atomic standard operations unless CONFIG_REFCOUNT_FULL is enabled. This is a compromise for the systems that are critical on performance (such as net) and cannot accept even slight delay on the refcounter operations. This series, for core kernel components, replaces atomic_t reference counters with the new refcount_t type and API (see include/linux/refcount.h). By doing this we prevent intentional or accidental underflows or overflows that can led to use-after-free vulnerabilities. The patches are fully independent and can be cherry-picked separately. If there are no objections to the patches, please merge them via respective trees. Elena Reshetova (15): sched: convert sighand_struct.count to refcount_t sched: convert signal_struct.sigcnt to refcount_t sched: convert user_struct.__count to refcount_t sched: convert numa_group.refcount to refcount_t sched/task_struct: convert task_struct.usage to refcount_t sched/task_struct: convert task_struct.stack_refcount to refcount_t perf: convert perf_event_context.refcount to refcount_t perf/ring_buffer: convert ring_buffer.refcount to refcount_t perf/ring_buffer: convert ring_buffer.aux_refcount to refcount_t uprobes: convert uprobe.ref to refcount_t nsproxy: convert nsproxy.count to refcount_t groups: convert group_info.usage to refcount_t creds: convert cred.usage to refcount_t futex: convert futex_pi_state.refcount to refcount_t kcov: convert kcov.refcount to refcount_t fs/exec.c | 4 ++-- fs/proc/task_nommu.c | 2 +- include/linux/cred.h | 13 ++++++------ include/linux/init_task.h | 7 +++--- include/linux/nsproxy.h | 6 +++--- include/linux/perf_event.h | 3 ++- include/linux/sched.h | 5 +++-- include/linux/sched/signal.h | 5 +++-- include/linux/sched/task.h | 4 ++-- include/linux/sched/task_stack.h | 2 +- include/linux/sched/user.h | 5 +++-- kernel/cred.c | 46 ++++++++++++++++++++-------------------- kernel/events/core.c | 18 ++++++++-------- kernel/events/internal.h | 5 +++-- kernel/events/ring_buffer.c | 8 +++---- kernel/events/uprobes.c | 8 +++---- kernel/fork.c | 24 ++++++++++----------- kernel/futex.c | 13 ++++++------ kernel/groups.c | 2 +- kernel/kcov.c | 9 ++++---- kernel/nsproxy.c | 6 +++--- kernel/sched/fair.c | 12 +++++------ kernel/user.c | 8 +++---- 23 files changed, 112 insertions(+), 103 deletions(-) -- 2.7.4
