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authorCasey Schaufler <casey@schaufler-ca.com>2023-09-12 13:56:50 -0700
committerPaul Moore <paul@paul-moore.com>2023-11-12 22:54:42 -0500
commitad4aff9ec25f400608283c10d634cc4eeda83a02 (patch)
tree433e899f0d7cf1d526af229fa3e68cf9e3ff3528 /security/lsm_syscalls.c
parenta04a1198088a1378d0389c250cc684f649bcc91e (diff)
LSM: Create lsm_list_modules system call
Create a system call to report the list of Linux Security Modules that are active on the system. The list is provided as an array of LSM ID numbers. The calling application can use this list determine what LSM specific actions it might take. That might include choosing an output format, determining required privilege or bypassing security module specific behavior. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Mickaël Salaün <mic@digikod.net> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/lsm_syscalls.c')
-rw-r--r--security/lsm_syscalls.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/security/lsm_syscalls.c b/security/lsm_syscalls.c
index 226ae80d9683..329aaca5efc0 100644
--- a/security/lsm_syscalls.c
+++ b/security/lsm_syscalls.c
@@ -55,3 +55,42 @@ SYSCALL_DEFINE4(lsm_get_self_attr, unsigned int, attr, struct lsm_ctx __user *,
{
return security_getselfattr(attr, ctx, size, flags);
}
+
+/**
+ * sys_lsm_list_modules - Return a list of the active security modules
+ * @ids: the LSM module ids
+ * @size: pointer to size of @ids, updated on return
+ * @flags: reserved for future use, must be zero
+ *
+ * Returns a list of the active LSM ids. On success this function
+ * returns the number of @ids array elements. This value may be zero
+ * if there are no LSMs active. If @size is insufficient to contain
+ * the return data -E2BIG is returned and @size is set to the minimum
+ * required size. In all other cases a negative value indicating the
+ * error is returned.
+ */
+SYSCALL_DEFINE3(lsm_list_modules, u64 __user *, ids, size_t __user *, size,
+ u32, flags)
+{
+ size_t total_size = lsm_active_cnt * sizeof(*ids);
+ size_t usize;
+ int i;
+
+ if (flags)
+ return -EINVAL;
+
+ if (get_user(usize, size))
+ return -EFAULT;
+
+ if (put_user(total_size, size) != 0)
+ return -EFAULT;
+
+ if (usize < total_size)
+ return -E2BIG;
+
+ for (i = 0; i < lsm_active_cnt; i++)
+ if (put_user(lsm_idlist[i]->id, ids++))
+ return -EFAULT;
+
+ return lsm_active_cnt;
+}