From: Peter Zijlstra <peterz@infradead.org>
To: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Song Liu <songliubraving@fb.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
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"james.bottomley@hansenpartnership.com"
<james.bottomley@hansenpartnership.com>,
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Subject: Re: [Intel-gfx] [PATCH v4 2/9] perf/core: open access for CAP_SYS_PERFMON privileged process
Date: Fri, 10 Jan 2020 15:02:34 +0100 [thread overview]
Message-ID: <20200110140234.GO2844@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <cc239899-5c52-2fd0-286d-4bff18877937@linux.intel.com>
On Thu, Jan 09, 2020 at 02:36:50PM +0300, Alexey Budankov wrote:
> On 08.01.2020 19:07, Peter Zijlstra wrote:
> > On Wed, Dec 18, 2019 at 12:25:35PM +0300, Alexey Budankov wrote:
> >> diff --git a/kernel/events/core.c b/kernel/events/core.c
> >> index 059ee7116008..d9db414f2197 100644
> >> --- a/kernel/events/core.c
> >> +++ b/kernel/events/core.c
> >> @@ -9056,7 +9056,7 @@ static int perf_kprobe_event_init(struct perf_event *event)
> >> if (event->attr.type != perf_kprobe.type)
> >> return -ENOENT;
> >>
> >> - if (!capable(CAP_SYS_ADMIN))
> >> + if (!perfmon_capable())
> >> return -EACCES;
> >>
> >> /*
> >
> > This one only allows attaching to already extant kprobes, right? It does
> > not allow creation of kprobes.
>
> This unblocks creation of local trace kprobes and uprobes by CAP_SYS_PERFMON
> privileged process, exactly the same as for CAP_SYS_ADMIN privileged process.
I've no idea what you just said; it's just words.
Again, this only allows attaching to previously created kprobes, it does
not allow creating kprobes, right?
That is; I don't think CAP_SYS_PERFMON should be allowed to create
kprobes.
As might be clear; I don't actually know what the user-ABI is for
creating kprobes.
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next prev parent reply other threads:[~2020-01-10 15:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 9:16 [Intel-gfx] [PATCH v4 0/7] Introduce CAP_SYS_PERFMON to secure system performance monitoring and observability Alexey Budankov
2019-12-18 9:24 ` [Intel-gfx] [PATCH v4 1/9] capabilities: introduce CAP_SYS_PERFMON to kernel and user space Alexey Budankov
2019-12-18 19:56 ` Stephen Smalley
2019-12-28 3:53 ` Serge E. Hallyn
2020-01-13 20:25 ` Song Liu
2019-12-18 9:25 ` [Intel-gfx] [PATCH v4 2/9] perf/core: open access for CAP_SYS_PERFMON privileged process Alexey Budankov
2020-01-08 16:07 ` Peter Zijlstra
2020-01-09 11:36 ` Alexey Budankov
2020-01-10 14:02 ` Peter Zijlstra [this message]
2020-01-10 15:52 ` Masami Hiramatsu
2020-01-10 16:45 ` Arnaldo Carvalho de Melo
2020-01-10 23:47 ` Masami Hiramatsu
2020-01-11 0:23 ` Song Liu
2020-01-11 0:35 ` arnaldo.melo
2020-01-12 1:44 ` Masami Hiramatsu
2020-01-10 16:41 ` Alexey Budankov
2020-01-10 17:34 ` Alexey Budankov
2019-12-18 9:26 ` [Intel-gfx] [PATCH v4 3/9] perf tool: extend Perf tool with CAP_SYS_PERFMON capability support Alexey Budankov
2019-12-18 9:27 ` [Intel-gfx] [PATCH v4 4/9] drm/i915/perf: open access for CAP_SYS_PERFMON privileged process Alexey Budankov
2019-12-19 9:10 ` Lionel Landwerlin
2019-12-18 9:28 ` [Intel-gfx] [PATCH v4 5/9] trace/bpf_trace: " Alexey Budankov
2020-01-13 20:47 ` Song Liu
2019-12-18 9:28 ` [Intel-gfx] [PATCH v4 6/9] powerpc/perf: " Alexey Budankov
2019-12-18 9:29 ` [Intel-gfx] [PATCH v4 7/9] parisc/perf: " Alexey Budankov
2020-01-27 8:52 ` Helge Deller
2019-12-18 9:30 ` [Intel-gfx] [PATCH v4 8/9] drivers/perf: " Alexey Budankov
2020-01-17 10:51 ` Will Deacon
2020-01-17 21:33 ` Alexey Budankov
2019-12-18 9:31 ` [Intel-gfx] [PATCH v4 9/9] drivers/oprofile: " Alexey Budankov
2019-12-18 10:11 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for Introduce CAP_SYS_PERFMON to secure system performance monitoring and observability (rev3) Patchwork
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