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authorDavid Howells <dhowells@redhat.com>2019-08-20 03:18:00 +0300
committerJames Morris <jmorris@namei.org>2019-08-20 07:54:16 +0300
commitb0c8fdc7fdb77586c3d1937050925b960743306e (patch)
treebdd70cb78f6630c2e98a06aaae45600fcbb03f89 /security/lockdown
parent9d1f8be5cf42b497a3bddf1d523f2bb142e9318c (diff)
downloadlinux-b0c8fdc7fdb77586c3d1937050925b960743306e.tar.xz
lockdown: Lock down perf when in confidentiality mode
Disallow the use of certain perf facilities that might allow userspace to access kernel data. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Matthew Garrett <mjg59@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/lockdown')
-rw-r--r--security/lockdown/lockdown.c1
1 files changed, 1 insertions, 0 deletions
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",
};