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

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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.

Signed-off-by: Kees Cook <kees.cook@canonical.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
This commit is contained in:
Kees Cook 2008-10-06 03:11:58 +04:00 • committed by Alexey Dobriyan
parent a6bebbc87a
commit 4783072308
1 changed files with 9 additions and 0 deletions
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9
fs/proc/base.c
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@ -2438,6 +2438,13 @@ static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
} }
#endif /* CONFIG_TASK_IO_ACCOUNTING */ #endif /* CONFIG_TASK_IO_ACCOUNTING */
static 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;
}
/* /*
* Thread groups * Thread groups
*/ */
@ -2454,6 +2461,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("environ", S_IRUSR, environ), REG("environ", S_IRUSR, environ),
INF("auxv", S_IRUSR, pid_auxv), INF("auxv", S_IRUSR, pid_auxv),
ONE("status", S_IRUGO, pid_status), ONE("status", S_IRUGO, pid_status),
ONE("personality", S_IRUSR, pid_personality),
INF("limits", S_IRUSR, pid_limits), INF("limits", S_IRUSR, pid_limits),
#ifdef CONFIG_SCHED_DEBUG #ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, pid_sched), REG("sched", S_IRUGO|S_IWUSR, pid_sched),
@ -2789,6 +2797,7 @@ static const struct pid_entry tid_base_stuff[] = {
REG("environ", S_IRUSR, environ), REG("environ", S_IRUSR, environ),
INF("auxv", S_IRUSR, pid_auxv), INF("auxv", S_IRUSR, pid_auxv),
ONE("status", S_IRUGO, pid_status), ONE("status", S_IRUGO, pid_status),
ONE("personality", S_IRUSR, pid_personality),
INF("limits", S_IRUSR, pid_limits), INF("limits", S_IRUSR, pid_limits),
#ifdef CONFIG_SCHED_DEBUG #ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, pid_sched), REG("sched", S_IRUGO|S_IWUSR, pid_sched),