Quoting Kees Cook (keesc...@chromium.org):
> Use a common error reporting function for Yama violation reports, and give
> more detail into the process command lines.
>
> Signed-off-by: Kees Cook <keesc...@chromium.org>
Acked-by: Serge Hallyn <serge.hal...@canonical.com>
> ---
> security/yama/yama_lsm.c | 31 +++++++++++++++++++++----------
> 1 file changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
> index cb6ed10816d4..c19f6e5df9a3 100644
> --- a/security/yama/yama_lsm.c
> +++ b/security/yama/yama_lsm.c
> @@ -18,6 +18,7 @@
> #include <linux/prctl.h>
> #include <linux/ratelimit.h>
> #include <linux/workqueue.h>
> +#include <linux/string_helpers.h>
>
> #define YAMA_SCOPE_DISABLED 0
> #define YAMA_SCOPE_RELATIONAL 1
> @@ -41,6 +42,22 @@ static DEFINE_SPINLOCK(ptracer_relations_lock);
> static void yama_relation_cleanup(struct work_struct *work);
> static DECLARE_WORK(yama_relation_work, yama_relation_cleanup);
>
> +static void report_access(const char *access, struct task_struct *target,
> + struct task_struct *agent)
> +{
> + char *target_cmd, *agent_cmd;
> +
> + target_cmd = kstrdup_quotable_cmdline(target, GFP_KERNEL);
> + agent_cmd = kstrdup_quotable_cmdline(agent, GFP_KERNEL);
> +
> + pr_notice_ratelimited(
> + "ptrace %s of \"%s\"[%d] was attempted by \"%s\"[%d]\n",
> + access, target_cmd, target->pid, agent_cmd, agent->pid);
> +
> + kfree(agent_cmd);
> + kfree(target_cmd);
> +}
> +
> /**
> * yama_relation_cleanup - remove invalid entries from the relation list
> *
> @@ -307,11 +324,8 @@ static int yama_ptrace_access_check(struct task_struct
> *child,
> }
> }
>
> - if (rc && (mode & PTRACE_MODE_NOAUDIT) == 0) {
> - printk_ratelimited(KERN_NOTICE
> - "ptrace of pid %d was attempted by: %s (pid %d)\n",
> - child->pid, current->comm, current->pid);
> - }
> + if (rc && (mode & PTRACE_MODE_NOAUDIT) == 0)
> + report_access("attach", child, current);
>
> return rc;
> }
> @@ -337,11 +351,8 @@ int yama_ptrace_traceme(struct task_struct *parent)
> break;
> }
>
> - if (rc) {
> - printk_ratelimited(KERN_NOTICE
> - "ptraceme of pid %d was attempted by: %s (pid %d)\n",
> - current->pid, parent->comm, parent->pid);
> - }
> + if (rc)
> + report_access("traceme", current, parent);
>
> return rc;
> }
> --
> 2.6.3
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