seccomp: fix build warnings when there is no CONFIG_SECCOMP_FILTER
If both audit and seccomp filter support are disabled, 'ret' is marked
as unused.
If just seccomp filter support is disabled, data and skip are considered
unused.
This change fixes those build warnings.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Will Drewry <wad@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index d9db6ec..ee376be 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -377,8 +377,7 @@
int mode = current->seccomp.mode;
int exit_sig = 0;
int *syscall;
- u32 ret = SECCOMP_RET_KILL;
- int data;
+ u32 ret;
switch (mode) {
case SECCOMP_MODE_STRICT:
@@ -392,12 +391,15 @@
return 0;
} while (*++syscall);
exit_sig = SIGKILL;
+ ret = SECCOMP_RET_KILL;
break;
#ifdef CONFIG_SECCOMP_FILTER
- case SECCOMP_MODE_FILTER:
+ case SECCOMP_MODE_FILTER: {
+ int data;
ret = seccomp_run_filters(this_syscall);
data = ret & SECCOMP_RET_DATA;
- switch (ret & SECCOMP_RET_ACTION) {
+ ret &= SECCOMP_RET_ACTION;
+ switch (ret) {
case SECCOMP_RET_ERRNO:
/* Set the low-order 16-bits as a errno. */
syscall_set_return_value(current, task_pt_regs(current),
@@ -432,6 +434,7 @@
}
exit_sig = SIGSYS;
break;
+ }
#endif
default:
BUG();
@@ -442,8 +445,10 @@
#endif
audit_seccomp(this_syscall, exit_sig, ret);
do_exit(exit_sig);
+#ifdef CONFIG_SECCOMP_FILTER
skip:
audit_seccomp(this_syscall, exit_sig, ret);
+#endif
return -1;
}