fs: add link restriction audit reporting
Adds audit messages for unexpected link restriction violations so that
system owners will have some sort of potentially actionable information
about misbehaving processes.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index 3861d85..618d353 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -692,6 +692,7 @@
path_put_conditional(link, nd);
path_put(&nd->path);
+ audit_log_link_denied("follow_link", link);
return -EACCES;
}
@@ -760,6 +761,7 @@
capable(CAP_FOWNER))
return 0;
+ audit_log_link_denied("linkat", link);
return -EPERM;
}