Re: [PATCH v2] proc: show personality via /proc/pid/personality

[Michael Kerrisk]

Kees,

On Sun, Oct 5, 2008 at 12:14 PM, Kees Cook <kees.cook@xxxxxxxxxxxxx> wrote:
> Make process personality flags visible in /proc.  Since a process's
> personality is potentially sensitive (e.g. READ_IMPLIES_EXEC), make this
> file only readable by the process owner.

Please CC userland interface changes to linux-api@xxxxxxxxxxxxxxx

Ceers,

Michael

> Signed-off-by: Kees Cook <kees.cook@xxxxxxxxxxxxx>
> ---
> Please revert the prior patch against the "status" file -- this is the
> alternative.
> ---
>  fs/proc/array.c    |    8 ++++++++
>  fs/proc/base.c     |    2 ++
>  fs/proc/internal.h |    2 ++
>  3 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index 71c9be5..6b6b492 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c
> @@ -337,6 +337,14 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
>        return 0;
>  }
>
> +int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
> +                       struct pid *pid, struct task_struct *task)
> +{
> +       seq_printf(m, "%08x\n", task->personality);
> +
> +       return 0;
> +}
> +
>  static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
>                        struct pid *pid, struct task_struct *task, int whole)
>  {
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index a28840b..c675c62 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2459,6 +2459,7 @@ static const struct pid_entry tgid_base_stuff[] = {
>        REG("environ",    S_IRUSR, environ),
>        INF("auxv",       S_IRUSR, pid_auxv),
>        ONE("status",     S_IRUGO, pid_status),
> +       ONE("personality", S_IRUSR, pid_personality),
>        INF("limits",     S_IRUSR, pid_limits),
>  #ifdef CONFIG_SCHED_DEBUG
>        REG("sched",      S_IRUGO|S_IWUSR, pid_sched),
> @@ -2794,6 +2795,7 @@ static const struct pid_entry tid_base_stuff[] = {
>        REG("environ",   S_IRUSR, environ),
>        INF("auxv",      S_IRUSR, pid_auxv),
>        ONE("status",    S_IRUGO, pid_status),
> +       ONE("personality", S_IRUSR, pid_personality),
>        INF("limits",    S_IRUSR, pid_limits),
>  #ifdef CONFIG_SCHED_DEBUG
>        REG("sched",     S_IRUGO|S_IWUSR, pid_sched),
> diff --git a/fs/proc/internal.h b/fs/proc/internal.h
> index 4422023..747e3de 100644
> --- a/fs/proc/internal.h
> +++ b/fs/proc/internal.h
> @@ -53,6 +53,8 @@ extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
>                                struct pid *pid, struct task_struct *task);
>  extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
>                                struct pid *pid, struct task_struct *task);
> +extern int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
> +                               struct pid *pid, struct task_struct *task);
>  extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
>                                struct pid *pid, struct task_struct *task);
>  extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
> --
> 1.5.6.3
>
>
> --
> Kees Cook
> Ubuntu Security Team
> --
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-- 
Michael Kerrisk Linux man-pages maintainer;
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