diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 3d478abf411c..1660039199b2 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -958,7 +958,7 @@ extern void __perf_event_task_sched_in(struct task_struct *prev, struct task_struct *task); extern void __perf_event_task_sched_out(struct task_struct *prev, struct task_struct *next); -extern int perf_event_init_task(struct task_struct *child); +extern int perf_event_init_task(struct task_struct *child, u64 clone_flags); extern void perf_event_exit_task(struct task_struct *child); extern void perf_event_free_task(struct task_struct *task); extern void perf_event_delayed_put(struct task_struct *task); @@ -1449,7 +1449,8 @@ perf_event_task_sched_in(struct task_struct *prev, static inline void perf_event_task_sched_out(struct task_struct *prev, struct task_struct *next) { } -static inline int perf_event_init_task(struct task_struct *child) { return 0; } +static inline int perf_event_init_task(struct task_struct *child, + u64 clone_flags) { return 0; } static inline void perf_event_exit_task(struct task_struct *child) { } static inline void perf_event_free_task(struct task_struct *task) { } static inline void perf_event_delayed_put(struct task_struct *task) { } diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index ad15e40d7f5d..813efb65fea8 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -389,7 +389,8 @@ struct perf_event_attr { cgroup : 1, /* include cgroup events */ text_poke : 1, /* include text poke events */ build_id : 1, /* use build id in mmap2 events */ - __reserved_1 : 29; + inherit_thread : 1, /* children only inherit if cloned with CLONE_THREAD */ + __reserved_1 : 28; union { __u32 wakeup_events; /* wakeup every n events */ diff --git a/kernel/events/core.c b/kernel/events/core.c index 10ed2cd434dc..3e3c00fd0b2e 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -11653,6 +11653,9 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr, (attr->sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) return -EINVAL; + if (!attr->inherit && attr->inherit_thread) + return -EINVAL; + out: return ret; @@ -12873,12 +12876,13 @@ static int inherit_task_group(struct perf_event *event, struct task_struct *parent, struct perf_event_context *parent_ctx, struct task_struct *child, int ctxn, - int *inherited_all) + u64 clone_flags, int *inherited_all) { int ret; struct perf_event_context *child_ctx; - if (!event->attr.inherit) { + if (!event->attr.inherit || + (event->attr.inherit_thread && !(clone_flags & CLONE_THREAD))) { *inherited_all = 0; return 0; } @@ -12910,7 +12914,8 @@ inherit_task_group(struct perf_event *event, struct task_struct *parent, /* * Initialize the perf_event context in task_struct */ -static int perf_event_init_context(struct task_struct *child, int ctxn) +static int perf_event_init_context(struct task_struct *child, int ctxn, + u64 clone_flags) { struct perf_event_context *child_ctx, *parent_ctx; struct perf_event_context *cloned_ctx; @@ -12950,7 +12955,8 @@ static int perf_event_init_context(struct task_struct *child, int ctxn) */ perf_event_groups_for_each(event, &parent_ctx->pinned_groups) { ret = inherit_task_group(event, parent, parent_ctx, - child, ctxn, &inherited_all); + child, ctxn, clone_flags, + &inherited_all); if (ret) goto out_unlock; } @@ -12966,7 +12972,8 @@ static int perf_event_init_context(struct task_struct *child, int ctxn) perf_event_groups_for_each(event, &parent_ctx->flexible_groups) { ret = inherit_task_group(event, parent, parent_ctx, - child, ctxn, &inherited_all); + child, ctxn, clone_flags, + &inherited_all); if (ret) goto out_unlock; } @@ -13008,7 +13015,7 @@ out_unlock: /* * Initialize the perf_event context in task_struct */ -int perf_event_init_task(struct task_struct *child) +int perf_event_init_task(struct task_struct *child, u64 clone_flags) { int ctxn, ret; @@ -13017,7 +13024,7 @@ int perf_event_init_task(struct task_struct *child) INIT_LIST_HEAD(&child->perf_event_list); for_each_task_context_nr(ctxn) { - ret = perf_event_init_context(child, ctxn); + ret = perf_event_init_context(child, ctxn, clone_flags); if (ret) { perf_event_free_task(child); return ret; diff --git a/kernel/fork.c b/kernel/fork.c index 0acc8ed1076b..3728a645771c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2078,7 +2078,7 @@ static __latent_entropy struct task_struct *copy_process( if (retval) goto bad_fork_cleanup_policy; - retval = perf_event_init_task(p); + retval = perf_event_init_task(p, clone_flags); if (retval) goto bad_fork_cleanup_policy; retval = audit_alloc(p);