[PATCH 00/15] v2 kernel core refcount conversions

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. If you want to test with refcount_t protection enabled, CONFIG_REFCOUNT_FULL must be enabled. * The respective change is currently merged into -next as "locking/refcount: Create unchecked atomic_t implementation". Elena Reshetova (15): kernel: convert sighand_struct.count from atomic_t to refcount_t kernel: convert signal_struct.sigcnt from atomic_t to refcount_t kernel: convert user_struct.__count from atomic_t to refcount_t kernel: convert task_struct.usage from atomic_t to refcount_t kernel: convert task_struct.stack_refcount from atomic_t to refcount_t kernel: convert perf_event_context.refcount from atomic_t to refcount_t kernel: convert ring_buffer.refcount from atomic_t to refcount_t kernel: convert ring_buffer.aux_refcount from atomic_t to refcount_t kernel: convert uprobe.ref from atomic_t to refcount_t kernel: convert nsproxy.count from atomic_t to refcount_t kernel: convert group_info.usage from atomic_t to refcount_t kernel: convert cred.usage from atomic_t to refcount_t kernel: convert numa_group.refcount from atomic_t to refcount_t kernel: convert futex_pi_state.refcount from atomic_t to refcount_t kernel: convert kcov.refcount from atomic_t 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 | 8 +++---- kernel/user.c | 8 +++---- 23 files changed, 110 insertions(+), 101 deletions(-) -- 2.7.4