diff options
| author | Jeff Vander Stoep <jeffv@google.com> | 2016-05-29 14:22:32 -0700 |
|---|---|---|
| committer | Gerrit - the friendly Code Review server <code-review@localhost> | 2016-09-13 12:23:33 -0700 |
| commit | 1a565f59cb3b227e0c7c1c5b58951aed5a27b5d6 (patch) | |
| tree | dc300c937957a981de72e361073f301ddfb37c9e /Documentation/sysctl | |
| parent | a647f40d2b02cbc0456037de049d4d9e53083420 (diff) | |
FROMLIST: security,perf: Allow further restriction of perf_event_open
When kernel.perf_event_open is set to 3 (or greater), disallow all
access to performance events by users without CAP_SYS_ADMIN.
Add a Kconfig symbol CONFIG_SECURITY_PERF_EVENTS_RESTRICT that
makes this value the default.
This is based on a similar feature in grsecurity
(CONFIG_GRKERNSEC_PERF_HARDEN). This version doesn't include making
the variable read-only. It also allows enabling further restriction
at run-time regardless of whether the default is changed.
https://lkml.org/lkml/2016/1/11/587
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Git-repo: https://android.googlesource.com/kernel/common.git
Git-commit: 012b0adcf7299f6509d4984cf46ee11e6eaed4e4
[d-cagle@codeaurora.org: Resolve trivial merge conflicts]
Signed-off-by: Dennis Cagle <d-cagle@codeaurora.org>
Bug: 29054680
Change-Id: Iff5bff4fc1042e85866df9faa01bce8d04335ab8
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 8ddf95ff9a9f..03e6aafd5b94 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -653,12 +653,14 @@ the existing panic controls already in that directory. perf_event_paranoid: Controls use of the performance events system by unprivileged -users (without CAP_SYS_ADMIN). The default value is 1. +users (without CAP_SYS_ADMIN). The default value is 3 if +CONFIG_SECURITY_PERF_EVENTS_RESTRICT is set, or 1 otherwise. -1: Allow use of (almost) all events by all users >=0: Disallow raw tracepoint access by users without CAP_IOC_LOCK >=1: Disallow CPU event access by users without CAP_SYS_ADMIN >=2: Disallow kernel profiling by users without CAP_SYS_ADMIN +>=3: Disallow all event access by users without CAP_SYS_ADMIN ============================================================== |