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security: Add LSM hook to setgroups() syscall

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Give the LSM framework the ability to filter setgroups() syscalls. There
are already analagous hooks for the set*uid() and set*gid() syscalls.
The SafeSetID LSM will use this new hook to ensure setgroups() calls are
allowed by the installed security policy. Tested by putting print
statement in security_task_fix_setgroups() hook and confirming that it
gets hit when userspace does a setgroups() syscall.

Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Micah Morton <mortonm@chromium.org>
This commit is contained in:
Micah Morton
2022-06-08 20:57:11 +00:00
parent a1732d6898
commit fcfe0ac2fc
5 changed files with 33 additions and 0 deletions
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7
include/linux/lsm_hooks.h
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@@ -702,6 +702,13 @@
* @old is the set of credentials that are being replaced.
* @flags contains one of the LSM_SETID_* values.
* Return 0 on success.
* @task_fix_setgroups:
* Update the module's state after setting the supplementary group
* identity attributes of the current process.
* @new is the set of credentials that will be installed. Modifications
* should be made to this rather than to @current->cred.
* @old is the set of credentials that are being replaced.
* Return 0 on success.
* @task_setpgid:
* Check permission before setting the process group identifier of the
* process @p to @pgid.