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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344// 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; }}