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| author | David Howells <dhowells@redhat.com> | 2019-08-19 17:17:59 -0700 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2019-08-19 21:54:16 -0700 |
| commit | 9d1f8be5cf42b497a3bddf1d523f2bb142e9318c (patch) | |
| tree | fc926ba08f6b2b69c2b9341de2a16d2870b25bda /security/lockdown | |
| parent | a94549dd87f5ea4ca50fee493df08a2dc6256b53 (diff) | |
| download | linux-9d1f8be5cf42b497a3bddf1d523f2bb142e9318c.tar.gz | |
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.c | 1 |
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", }; |