1 files changed, 75 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 991482811f1e..54c2e5621afb 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -63,6 +63,7 @@
 #include <linux/mm.h>
 #include <linux/rcupdate.h>
 #include <linux/kallsyms.h>
+#include <linux/resource.h>
 #include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/security.h>
@@ -303,6 +304,78 @@ static int proc_oom_score(struct task_struct *task, char *buffer)
         return sprintf(buffer, "%lu\n", points);
 }
 
+struct limit_names {
+        char *name;
+        char *unit;
+};
+
+static const struct limit_names lnames[RLIM_NLIMITS] = {
+        [RLIMIT_CPU] = {"Max cpu time", "ms"},
+        [RLIMIT_FSIZE] = {"Max file size", "bytes"},
+        [RLIMIT_DATA] = {"Max data size", "bytes"},
+        [RLIMIT_STACK] = {"Max stack size", "bytes"},
+        [RLIMIT_CORE] = {"Max core file size", "bytes"},
+        [RLIMIT_RSS] = {"Max resident set", "bytes"},
+        [RLIMIT_NPROC] = {"Max processes", "processes"},
+        [RLIMIT_NOFILE] = {"Max open files", "files"},
+        [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
+        [RLIMIT_AS] = {"Max address space", "bytes"},
+        [RLIMIT_LOCKS] = {"Max file locks", "locks"},
+        [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
+        [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
+        [RLIMIT_NICE] = {"Max nice priority", NULL},
+        [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
+};
+
+/* Display limits for a process */
+static int proc_pid_limits(struct task_struct *task, char *buffer)
+{
+        unsigned int i;
+        int count = 0;
+        unsigned long flags;
+        char *bufptr = buffer;
+
+        struct rlimit rlim[RLIM_NLIMITS];
+
+        rcu_read_lock();
+        if (!lock_task_sighand(task,&flags)) {
+                rcu_read_unlock();
+                return 0;
+        }
+        memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
+        unlock_task_sighand(task, &flags);
+        rcu_read_unlock();
+
+        /*
+         * print the file header
+         */
+        count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
+                        "Limit", "Soft Limit", "Hard Limit", "Units");
+
+        for (i = 0; i < RLIM_NLIMITS; i++) {
+                if (rlim[i].rlim_cur == RLIM_INFINITY)
+                        count += sprintf(&bufptr[count], "%-25s %-20s ",
+                                         lnames[i].name, "unlimited");
+                else
+                        count += sprintf(&bufptr[count], "%-25s %-20lu ",
+                                         lnames[i].name, rlim[i].rlim_cur);
+
+                if (rlim[i].rlim_max == RLIM_INFINITY)
+                        count += sprintf(&bufptr[count], "%-20s ", "unlimited");
+                else
+                        count += sprintf(&bufptr[count], "%-20lu ",
+                                         rlim[i].rlim_max);
+
+                if (lnames[i].unit)
+                        count += sprintf(&bufptr[count], "%-10s\n",
+                                         lnames[i].unit);
+                else
+                        count += sprintf(&bufptr[count], "\n");
+        }
+
+        return count;
+}
+
 /************************************************************************/
 /*                       Here the fs part begins                        */
 /************************************************************************/
@@ -2110,6 +2183,7 @@ static const struct pid_entry tgid_base_stuff[] = {
         REG("environ",    S_IRUSR, environ),
         INF("auxv",       S_IRUSR, pid_auxv),
         INF("status",     S_IRUGO, pid_status),
+        INF("limits",     S_IRUSR, pid_limits),
 #ifdef CONFIG_SCHED_DEBUG
         REG("sched",      S_IRUGO|S_IWUSR, pid_sched),
 #endif
@@ -2435,6 +2509,7 @@ static const struct pid_entry tid_base_stuff[] = {
         REG("environ",   S_IRUSR, environ),
         INF("auxv",      S_IRUSR, pid_auxv),
         INF("status",    S_IRUGO, pid_status),
+        INF("limits",    S_IRUSR, pid_limits),
 #ifdef CONFIG_SCHED_DEBUG
         REG("sched",     S_IRUGO|S_IWUSR, pid_sched),
 #endif