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yama: Better permission check for ptraceme

Change the permission check for yama_ptrace_ptracee to the standard
ptrace permission check, testing if the traceer has CAP_SYS_PTRACE
in the tracees user namespace.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
master
Eric W. Biederman 9 years ago
parent
commit
eddc0a3abf
  1. 4
      security/yama/yama_lsm.c

4
security/yama/yama_lsm.c

@ -347,10 +347,8 @@ int yama_ptrace_traceme(struct task_struct *parent)
/* Only disallow PTRACE_TRACEME on more aggressive settings. */
switch (ptrace_scope) {
case YAMA_SCOPE_CAPABILITY:
rcu_read_lock();
if (!ns_capable(__task_cred(parent)->user_ns, CAP_SYS_PTRACE))
if (!has_ns_capability(parent, current_user_ns(), CAP_SYS_PTRACE))
rc = -EPERM;
rcu_read_unlock();
break;
case YAMA_SCOPE_NO_ATTACH:
rc = -EPERM;

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