From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael Kerrisk" Subject: Re: [PATCH v2] proc: show personality via /proc/pid/personality Date: Tue, 7 Oct 2008 15:39:26 +0200 Message-ID: <517f3f820810070639q549ed2a1pe297e45108dfa007@mail.gmail.com> References: <20081002211424.GJ10632@outflux.net> <20081004145149.52c34ee7@infradead.org> <20081004220220.GK10632@outflux.net> <20081004164239.0c1483a4@infradead.org> <20081005004233.GL10632@outflux.net> <20081004174843.6fe48a8e@infradead.org> <20081005091120.GA21003@x200.localdomain> <20081005101438.GR10632@outflux.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20081005101438.GR10632-oSa+0FWJbaXR7s880joybQ@public.gmane.org> Content-Disposition: inline Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Kees Cook Cc: Alexey Dobriyan , Arjan van de Ven , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Michael Kerrisk , linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-api@vger.kernel.org Kees, On Sun, Oct 5, 2008 at 12:14 PM, Kees Cook 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-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Ceers, Michael > Signed-off-by: Kees Cook > --- > 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 > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Found a documentation bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html