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authorTyler Hicks <tyhicks@canonical.com>2017-08-11 04:33:52 +0000
committerKees Cook <keescook@chromium.org>2017-08-14 13:46:43 -0700
commit8e5f1ad116df6b0de65eac458d5e7c318d1c05af (patch)
tree88e0c7fe5c3a8099c65d70a4a54562ce37ff4887 /Documentation/userspace-api
parentdeb4de8b31bc5bf21efb6ac31150a01a631cd647 (diff)
seccomp: Sysctl to display available actions
This patch creates a read-only sysctl containing an ordered list of seccomp actions that the kernel supports. The ordering, from left to right, is the lowest action value (kill) to the highest action value (allow). Currently, a read of the sysctl file would return "kill trap errno trace allow". The contents of this sysctl file can be useful for userspace code as well as the system administrator. The path to the sysctl is: /proc/sys/kernel/seccomp/actions_avail libseccomp and other userspace code can easily determine which actions the current kernel supports. The set of actions supported by the current kernel may be different than the set of action macros found in kernel headers that were installed where the userspace code was built. In addition, this sysctl will allow system administrators to know which actions are supported by the kernel and make it easier to configure exactly what seccomp logs through the audit subsystem. Support for this level of logging configuration will come in a future patch. Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'Documentation/userspace-api')
-rw-r--r--Documentation/userspace-api/seccomp_filter.rst16
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/userspace-api/seccomp_filter.rst b/Documentation/userspace-api/seccomp_filter.rst
index f71eb5ef1f2d..35fc7cbf1d95 100644
--- a/Documentation/userspace-api/seccomp_filter.rst
+++ b/Documentation/userspace-api/seccomp_filter.rst
@@ -169,7 +169,23 @@ The ``samples/seccomp/`` directory contains both an x86-specific example
and a more generic example of a higher level macro interface for BPF
program generation.
+Sysctls
+=======
+
+Seccomp's sysctl files can be found in the ``/proc/sys/kernel/seccomp/``
+directory. Here's a description of each file in that directory:
+
+``actions_avail``:
+ A read-only ordered list of seccomp return values (refer to the
+ ``SECCOMP_RET_*`` macros above) in string form. The ordering, from
+ left-to-right, is the least permissive return value to the most
+ permissive return value.
+ The list represents the set of seccomp return values supported
+ by the kernel. A userspace program may use this list to
+ determine if the actions found in the ``seccomp.h``, when the
+ program was built, differs from the set of actions actually
+ supported in the current running kernel.
Adding architecture support
===========================