From eddc0a3abff273842a94784d2d022bbc36dc9015 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 21 Mar 2013 02:30:41 -0700 Subject: [PATCH] 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 Signed-off-by: "Eric W. Biederman" --- security/yama/yama_lsm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index 23414b93771f..13c88fbcf037 100644 --- a/security/yama/yama_lsm.c +++ b/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; -- 2.34.1