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-rw-r--r--include/linux/security.h1
-rw-r--r--kernel/events/core.c7
-rw-r--r--security/lockdown/lockdown.c1
3 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/security.h b/include/linux/security.h
index e604f4c67f03..b94f1e697537 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -119,6 +119,7 @@ enum lockdown_reason {
LOCKDOWN_KCORE,
LOCKDOWN_KPROBES,
LOCKDOWN_BPF_READ,
+ LOCKDOWN_PERF,
LOCKDOWN_CONFIDENTIALITY_MAX,
};
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f85929ce13be..8732f980a4fc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10798,6 +10798,13 @@ SYSCALL_DEFINE5(perf_event_open,
perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
return -EACCES;
+ err = security_locked_down(LOCKDOWN_PERF);
+ if (err && (attr.sample_type & PERF_SAMPLE_REGS_INTR))
+ /* REGS_INTR can leak data, lockdown must prevent this */
+ return err;
+
+ err = 0;
+
/*
* In cgroup mode, the pid argument is used to pass the fd
* opened to the cgroup directory in cgroupfs. The cpu argument
diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index 2397772c56bd..3d7b1039457b 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -34,6 +34,7 @@ static char *lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = {
[LOCKDOWN_KCORE] = "/proc/kcore access",
[LOCKDOWN_KPROBES] = "use of kprobes",
[LOCKDOWN_BPF_READ] = "use of bpf to read kernel RAM",
+ [LOCKDOWN_PERF] = "unsafe use of perf",
[LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
};