Re: [PATCH v7 01/12] capabilities: introduce CAP_PERFMON to kernel and user space

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On 2/17/20 3:06 AM, Alexey Budankov wrote:

Introduce CAP_PERFMON capability designed to secure system performance
monitoring and observability operations so that CAP_PERFMON would assist
CAP_SYS_ADMIN capability in its governing role for performance
monitoring and observability subsystems.

CAP_PERFMON hardens system security and integrity during performance
monitoring and observability operations by decreasing attack surface
that is available to a CAP_SYS_ADMIN privileged process [2]. Providing
the access to system performance monitoring and observability operations
under CAP_PERFMON capability singly, without the rest of CAP_SYS_ADMIN
credentials, excludes chances to misuse the credentials and makes the
operation more secure. Thus, CAP_PERFMON implements the principal of
least privilege for performance monitoring and observability operations
(POSIX IEEE 1003.1e: 2.2.2.39 principle of least privilege: A security
design principle that states that a process or program be granted only
those privileges (e.g., capabilities) necessary to accomplish its
legitimate function, and only for the time that such privileges are
actually required)

CAP_PERFMON meets the demand to secure system performance monitoring and
observability operations for adoption in security sensitive, restricted,
multiuser production environments (e.g. HPC clusters, cloud and virtual
compute environments), where root or CAP_SYS_ADMIN credentials are not
available to mass users of a system, and securely unblocks accessibility
of system performance monitoring and observability operations beyond
the root and CAP_SYS_ADMIN use cases.

CAP_PERFMON takes over CAP_SYS_ADMIN credentials related to system
performance monitoring and observability operations and balances amount
of CAP_SYS_ADMIN credentials following the recommendations in the
capabilities man page [1] for CAP_SYS_ADMIN: "Note: this capability is
overloaded; see Notes to kernel developers, below." For backward
compatibility reasons access to system performance monitoring and
observability subsystems of the kernel remains open for CAP_SYS_ADMIN
privileged processes but CAP_SYS_ADMIN usage for secure system
performance monitoring and observability operations is discouraged with
respect to the designed CAP_PERFMON capability.

Although the software running under CAP_PERFMON can not ensure avoidance
of related hardware issues, the software can still mitigate these issues
following the official hardware issues mitigation procedure [2].
The bugs in the software itself can be fixed following the standard
kernel development process [3] to maintain and harden security of system
performance monitoring and observability operations.

[1] http://man7.org/linux/man-pages/man7/capabilities.7.html
[2] https://www.kernel.org/doc/html/latest/process/embargoed-hardware-issues.html
[3] https://www.kernel.org/doc/html/latest/admin-guide/security-bugs.html

Signed-off-by: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>

Acked-by: Stephen Smalley <sds@xxxxxxxxxxxxx>

[...]



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