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From: Stephen Smalley <sds@tycho.nsa.gov>
To: Alexey Budankov <alexey.budankov@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	"jani.nikula@linux.intel.com" <jani.nikula@linux.intel.com>,
	"joonas.lahtinen@linux.intel.com"
	<joonas.lahtinen@linux.intel.com>,
	"rodrigo.vivi@intel.com" <rodrigo.vivi@intel.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	"james.bottomley@hansenpartnership.com" 
	<james.bottomley@hansenpartnership.com>,
	Serge Hallyn <serge@hallyn.com>, James Morris <jmorris@namei.org>,
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	Mark Rutland <mark.rutland@arm.com>,
	Casey Schaufler <casey@schaufler-ca.com>,
	Robert Richter <rric@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, Andi Kleen <ak@linux.intel.com>,
	Stephane Eranian <eranian@google.com>,
	Igor Lubashev <ilubashe@akamai.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
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	Thomas Gleixner <tglx@linutronix.de>,
	Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
	Lionel Landwerlin <lionel.g.landwerlin@intel.com>,
	Song Liu <songliubraving@fb.com>,
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Subject: Re: [PATCH v4 1/9] capabilities: introduce CAP_SYS_PERFMON to kernel and user space
Date: Wed, 18 Dec 2019 14:56:33 -0500
Message-ID: <c10d7785-1e75-4503-3560-99ab9f845a11@tycho.nsa.gov> (raw)
In-Reply-To: <e0cb2b8d-e964-bc23-bf80-58d7ac4ed6f1@linux.intel.com>

On 12/18/19 4:24 AM, Alexey Budankov wrote:
> 
> Introduce CAP_SYS_PERFMON capability devoted to secure system performance
> monitoring and observability operations so that CAP_SYS_PERFMON would
> assist CAP_SYS_ADMIN capability in its governing role for perf_events,
> i915_perf and other subsystems of the kernel.
> 
> CAP_SYS_PERFMON intends to harden system security and integrity during
> system performance monitoring and observability operations by decreasing
> attack surface that is available to CAP_SYS_ADMIN privileged processes.
> 
> CAP_SYS_PERFMON intends to take over CAP_SYS_ADMIN credentials related
> to system performance monitoring and observability operations and balance
> amount of CAP_SYS_ADMIN credentials in accordance with the recommendations
> provided in the man page for CAP_SYS_ADMIN [1]: "Note: this capability
> is overloaded; see Notes to kernel developers, below."
> 
> [1] http://man7.org/linux/man-pages/man7/capabilities.7.html
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>

Acked-by: Stephen Smalley <sds@tycho.nsa.gov>

Note for selinux developers: we will need to update the 
selinux-testsuite tests for perf_event when/if this change lands upstream.

> ---
>   include/linux/capability.h          | 4 ++++
>   include/uapi/linux/capability.h     | 8 +++++++-
>   security/selinux/include/classmap.h | 4 ++--
>   3 files changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/capability.h b/include/linux/capability.h
> index ecce0f43c73a..883c879baa4b 100644
> --- a/include/linux/capability.h
> +++ b/include/linux/capability.h
> @@ -251,6 +251,10 @@ extern bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct
>   extern bool capable_wrt_inode_uidgid(const struct inode *inode, int cap);
>   extern bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap);
>   extern bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns);
> +static inline bool perfmon_capable(void)
> +{
> +	return capable(CAP_SYS_PERFMON) || capable(CAP_SYS_ADMIN);
> +}
>   
>   /* audit system wants to get cap info from files as well */
>   extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps);
> diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h
> index 240fdb9a60f6..98e03cc76c7c 100644
> --- a/include/uapi/linux/capability.h
> +++ b/include/uapi/linux/capability.h
> @@ -366,8 +366,14 @@ struct vfs_ns_cap_data {
>   
>   #define CAP_AUDIT_READ		37
>   
> +/*
> + * Allow system performance and observability privileged operations
> + * using perf_events, i915_perf and other kernel subsystems
> + */
> +
> +#define CAP_SYS_PERFMON		38
>   
> -#define CAP_LAST_CAP         CAP_AUDIT_READ
> +#define CAP_LAST_CAP         CAP_SYS_PERFMON
>   
>   #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
>   
> diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
> index 7db24855e12d..bae602c623b0 100644
> --- a/security/selinux/include/classmap.h
> +++ b/security/selinux/include/classmap.h
> @@ -27,9 +27,9 @@
>   	    "audit_control", "setfcap"
>   
>   #define COMMON_CAP2_PERMS  "mac_override", "mac_admin", "syslog", \
> -		"wake_alarm", "block_suspend", "audit_read"
> +		"wake_alarm", "block_suspend", "audit_read", "sys_perfmon"
>   
> -#if CAP_LAST_CAP > CAP_AUDIT_READ
> +#if CAP_LAST_CAP > CAP_SYS_PERFMON
>   #error New capability defined, please update COMMON_CAP2_PERMS.
>   #endif
>   
> 


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-18  9:16 [PATCH v4 0/7] Introduce CAP_SYS_PERFMON to secure system performance monitoring and observability Alexey Budankov
2019-12-18  9:24 ` [PATCH v4 1/9] capabilities: introduce CAP_SYS_PERFMON to kernel and user space Alexey Budankov
2019-12-18 19:56   ` Stephen Smalley [this message]
2019-12-18  9:25 ` [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
2019-12-18  9:26 ` [PATCH v4 3/9] perf tool: extend Perf tool with CAP_SYS_PERFMON capability support Alexey Budankov
2019-12-18  9:27 ` [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 ` [PATCH v4 5/9] trace/bpf_trace: " Alexey Budankov
2019-12-18  9:28 ` [PATCH v4 6/9] powerpc/perf: " Alexey Budankov
2019-12-18  9:29 ` [PATCH v4 7/9] parisc/perf: " Alexey Budankov
2020-01-27  8:52   ` Helge Deller
2019-12-18  9:30 ` [PATCH v4 8/9] drivers/perf: " Alexey Budankov
2019-12-18  9:31 ` [PATCH v4 9/9] drivers/oprofile: " Alexey Budankov

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