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| author | Kees Cook <kees@ubuntu.com> | 2009-04-02 15:49:29 -0700 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-04-03 11:47:11 +1100 |
| commit | 3d43321b7015387cfebbe26436d0e9d299162ea1 (patch) | |
| tree | bae6bd123c8f573e844a7af11c96eb5f6a73e0ee /Documentation/sysctl | |
| parent | 8a6f83afd0c5355db6d11394a798e94950306239 (diff) | |
| download | lwn-3d43321b7015387cfebbe26436d0e9d299162ea1.tar.gz lwn-3d43321b7015387cfebbe26436d0e9d299162ea1.zip | |
modules: sysctl to block module loading
Implement a sysctl file that disables module-loading system-wide since
there is no longer a viable way to remove CAP_SYS_MODULE after the system
bounding capability set was removed in 2.6.25.
Value can only be set to "1", and is tested only if standard capability
checks allow CAP_SYS_MODULE. Given existing /dev/mem protections, this
should allow administrators a one-way method to block module loading
after initial boot-time module loading has finished.
Signed-off-by: Kees Cook <kees.cook@canonical.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index a4ccdd1981cf..02b134956273 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -30,6 +30,7 @@ show up in /proc/sys/kernel: - kstack_depth_to_print [ X86 only ] - l2cr [ PPC only ] - modprobe ==> Documentation/debugging-modules.txt +- modules_disabled - msgmax - msgmnb - msgmni @@ -179,6 +180,16 @@ kernel stack. ============================================================== +modules_disabled: + +A toggle value indicating if modules are allowed to be loaded +in an otherwise modular kernel. This toggle defaults to off +(0), but can be set true (1). Once true, modules can be +neither loaded nor unloaded, and the toggle cannot be set back +to false. + +============================================================== + osrelease, ostype & version: # cat osrelease |