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authorDavid Howells <dhowells@redhat.com>2019-08-20 03:17:59 +0300
committerJames Morris <jmorris@namei.org>2019-08-20 07:54:16 +0300
commit9d1f8be5cf42b497a3bddf1d523f2bb142e9318c (patch)
treefc926ba08f6b2b69c2b9341de2a16d2870b25bda /security/lockdown
parenta94549dd87f5ea4ca50fee493df08a2dc6256b53 (diff)
downloadlinux-9d1f8be5cf42b497a3bddf1d523f2bb142e9318c.tar.xz
bpf: Restrict bpf when kernel lockdown is in confidentiality mode
bpf_read() and bpf_read_str() could potentially be abused to (eg) allow private keys in kernel memory to be leaked. Disable them if the kernel has been locked down in confidentiality mode. Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Matthew Garrett <mjg59@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> cc: netdev@vger.kernel.org cc: Chun-Yi Lee <jlee@suse.com> cc: Alexei Starovoitov <alexei.starovoitov@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> 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 27b2cf51e443..2397772c56bd 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -33,6 +33,7 @@ static char *lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = {
[LOCKDOWN_INTEGRITY_MAX] = "integrity",
[LOCKDOWN_KCORE] = "/proc/kcore access",
[LOCKDOWN_KPROBES] = "use of kprobes",
+ [LOCKDOWN_BPF_READ] = "use of bpf to read kernel RAM",
[LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
};