| Message ID | e0cb2b8d-e964-bc23-bf80-58d7ac4ed6f1@linux.intel.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Headers | show |
| Series | Introduce CAP_SYS_PERFMON to secure system performance monitoring and observability | expand |
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 > >
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
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> --- include/linux/capability.h | 4 ++++ include/uapi/linux/capability.h | 8 +++++++- security/selinux/include/classmap.h | 4 ++-- 3 files changed, 13 insertions(+), 3 deletions(-)