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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fixes from Thomas Gleixner:

 - Prevent a potential inconistency in the perf user space access which
   might lead to evading sanity checks.

 - Prevent perf recording function trace entries twice

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/ftrace: Fix double traces of perf on ftrace:function
  perf/core: Fix potential double-fetch bug
This commit is contained in:
Linus Torvalds 2017-09-03 09:23:23 -07:00
commit e92d51aff5
7 changed files with 22 additions and 13 deletions
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2
include/linux/perf_event.h
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@ -1201,7 +1201,7 @@ extern void perf_event_init(void);
extern void perf_tp_event(u16 event_type, u64 count, void *record,
int entry_size, struct pt_regs *regs,
struct hlist_head *head, int rctx,
struct task_struct *task);
struct task_struct *task, struct perf_event *event);
extern void perf_bp_event(struct perf_event *event, void *data);
#ifndef perf_misc_flags

4
include/linux/trace_events.h
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@ -508,9 +508,9 @@ void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
static inline void
perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
u64 count, struct pt_regs *regs, void *head,
struct task_struct *task)
struct task_struct *task, struct perf_event *event)
{
perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
perf_tp_event(type, count, raw_data, size, regs, head, rctx, task, event);
}
#endif

15
kernel/events/core.c
View File

@ -7906,16 +7906,15 @@ void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
}
}
perf_tp_event(call->event.type, count, raw_data, size, regs, head,
rctx, task);
rctx, task, NULL);
}
EXPORT_SYMBOL_GPL(perf_trace_run_bpf_submit);
void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
struct pt_regs *regs, struct hlist_head *head, int rctx,
struct task_struct *task)
struct task_struct *task, struct perf_event *event)
{
struct perf_sample_data data;
struct perf_event *event;
struct perf_raw_record raw = {
.frag = {
@ -7929,9 +7928,15 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
perf_trace_buf_update(record, event_type);
hlist_for_each_entry_rcu(event, head, hlist_entry) {
/* Use the given event instead of the hlist */
if (event) {
if (perf_tp_event_match(event, &data, regs))
perf_swevent_event(event, count, &data, regs);
} else {
hlist_for_each_entry_rcu(event, head, hlist_entry) {
if (perf_tp_event_match(event, &data, regs))
perf_swevent_event(event, count, &data, regs);
}
}
/*
@ -9611,6 +9616,8 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
if (ret)
return -EFAULT;
attr->size = size;
if (attr->__reserved_1)
return -EINVAL;

4
kernel/trace/trace_event_perf.c
View File

@ -306,6 +306,7 @@ static void
perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *ops, struct pt_regs *pt_regs)
{
struct perf_event *event;
struct ftrace_entry *entry;
struct hlist_head *head;
struct pt_regs regs;
@ -329,8 +330,9 @@ perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,
entry->ip = ip;
entry->parent_ip = parent_ip;
event = container_of(ops, struct perf_event, ftrace_ops);
perf_trace_buf_submit(entry, ENTRY_SIZE, rctx, TRACE_FN,
1, &regs, head, NULL);
1, &regs, head, NULL, event);
#undef ENTRY_SIZE
}

4
kernel/trace/trace_kprobe.c
View File

@ -1200,7 +1200,7 @@ kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
memset(&entry[1], 0, dsize);
store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
head, NULL);
head, NULL, NULL);
}
NOKPROBE_SYMBOL(kprobe_perf_func);
@ -1236,7 +1236,7 @@ kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
entry->ret_ip = (unsigned long)ri->ret_addr;
store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
head, NULL);
head, NULL, NULL);
}
NOKPROBE_SYMBOL(kretprobe_perf_func);
#endif /* CONFIG_PERF_EVENTS */

4
kernel/trace/trace_syscalls.c
View File

@ -596,7 +596,7 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
(unsigned long *)&rec->args);
perf_trace_buf_submit(rec, size, rctx,
sys_data->enter_event->event.type, 1, regs,
head, NULL);
head, NULL, NULL);
}
static int perf_sysenter_enable(struct trace_event_call *call)
@ -667,7 +667,7 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
rec->nr = syscall_nr;
rec->ret = syscall_get_return_value(current, regs);
perf_trace_buf_submit(rec, size, rctx, sys_data->exit_event->event.type,
1, regs, head, NULL);
1, regs, head, NULL, NULL);
}
static int perf_sysexit_enable(struct trace_event_call *call)

2
kernel/trace/trace_uprobe.c
View File

@ -1156,7 +1156,7 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
}
perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
head, NULL);
head, NULL, NULL);
out:
preempt_enable();
}