// SPDX-License-Identifier: GPL-2.0-only
/*
 * ksyms_common.c: A split of kernel/kallsyms.c
 * Contains a few generic function definations independent of config KALLSYMS.
 */
#include <linux/kallsyms.h>
#include <linux/security.h>

static inline int kallsyms_for_perf(void)
{
#ifdef CONFIG_PERF_EVENTS
        extern int sysctl_perf_event_paranoid;

        if (sysctl_perf_event_paranoid <= 1)
                return 1;
#endif
        return 0;
}

/*
 * We show kallsyms information even to normal users if we've enabled
 * kernel profiling and are explicitly not paranoid (so kptr_restrict
 * is clear, and sysctl_perf_event_paranoid isn't set).
 *
 * Otherwise, require CAP_SYSLOG (assuming kptr_restrict isn't set to
 * block even that).
 */
bool kallsyms_show_value(const struct cred *cred)
{
        switch (kptr_restrict) {
        case 0:
                if (kallsyms_for_perf())
                        return true;
                fallthrough;
        case 1:
                if (security_capable(cred, &init_user_ns, CAP_SYSLOG,
                                     CAP_OPT_NOAUDIT) == 0)
                        return true;
                fallthrough;
        default:
                return false;
        }
}