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perf/core: out-of-line and export perf_allow_cpu/tracepoint()

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These helpers are static inline in <linux/perf_event.h> and reach
into sysctl_perf_event_paranoid and security_perf_event_open(),
neither of which is itself exported. The perf_allow_* trio is
therefore asymmetric: built-in callers can use any of the three, but
modular code can only call perf_allow_kernel().

Move both bodies into kernel/events/core.c next to perf_allow_kernel()
and export them with EXPORT_SYMBOL_GPL, following the shape of
commit 5e9629d0ae ("drivers/perf: arm_spe: Use perf_allow_kernel()
for permissions"). Existing in-tree callers live in built-in arch and
tracing code, so the change is invisible to them.

Provide !CONFIG_PERF_EVENTS stubs that fall back to perfmon_capable(),
so the helpers stay callable when perf is compiled out.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patch.msgid.link/20260527225507.2044027-2-ashutosh.dixit@intel.com
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
This commit is contained in:
John Hubbard
2026-05-27 15:55:06 -07:00
committed by Ashutosh Dixit
parent 637c8e3a52
commit d32bf877c0
2 changed files with 33 additions and 16 deletions
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31
include/linux/perf_event.h
View File

@@ -1791,22 +1791,8 @@ static inline int perf_is_paranoid(void)
}
extern int perf_allow_kernel(void);
static inline int perf_allow_cpu(void)
{
if (sysctl_perf_event_paranoid > 0 && !perfmon_capable())
return -EACCES;
return security_perf_event_open(PERF_SECURITY_CPU);
}
static inline int perf_allow_tracepoint(void)
{
if (sysctl_perf_event_paranoid > -1 && !perfmon_capable())
return -EPERM;
return security_perf_event_open(PERF_SECURITY_TRACEPOINT);
}
extern int perf_allow_cpu(void);
extern int perf_allow_tracepoint(void);
extern int perf_exclude_event(struct perf_event *event, struct pt_regs *regs);
@@ -2023,6 +2009,19 @@ perf_event_pause(struct perf_event *event, bool reset) { return 0; }
static inline int
perf_exclude_event(struct perf_event *event, struct pt_regs *regs) { return 0; }
static inline int perf_allow_kernel(void)
{
return perfmon_capable() ? 0 : -EACCES;
}
static inline int perf_allow_cpu(void)
{
return perfmon_capable() ? 0 : -EACCES;
}
static inline int perf_allow_tracepoint(void)
{
return perfmon_capable() ? 0 : -EPERM;
}
#endif /* !CONFIG_PERF_EVENTS */
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)

18
kernel/events/core.c
View File

@@ -14691,6 +14691,24 @@ int perf_allow_kernel(void)
}
EXPORT_SYMBOL_GPL(perf_allow_kernel);
int perf_allow_cpu(void)
{
if (sysctl_perf_event_paranoid > 0 && !perfmon_capable())
return -EACCES;
return security_perf_event_open(PERF_SECURITY_CPU);
}
EXPORT_SYMBOL_GPL(perf_allow_cpu);
int perf_allow_tracepoint(void)
{
if (sysctl_perf_event_paranoid > -1 && !perfmon_capable())
return -EPERM;
return security_perf_event_open(PERF_SECURITY_TRACEPOINT);
}
EXPORT_SYMBOL_GPL(perf_allow_tracepoint);
/*
* Inherit an event from parent task to child task.
*