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c/r: procfs: add start_data, end_data, start_brk members to /proc/$pi…

…d/stat v4

The mm->start_code/end_code, mm->start_data/end_data, mm->start_brk are
involved into calculation of program text/data segment sizes (which might
be seen in /proc/<pid>/statm) and into brk() call final address.

For restore we need to know all these values.  While
mm->start_code/end_code already present in /proc/$pid/stat, the rest
members are not, so this patch brings them in.

The restore procedure of these members is addressed in another patch using
prctl().

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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commit b3f7f573a20081910e34e99cbc91831f4f02f1ff 1 parent 067bce1
Cyrill Gorcunov authored January 12, 2012 torvalds committed January 12, 2012
3  Documentation/filesystems/proc.txt
@@ -307,6 +307,9 @@ Table 1-4: Contents of the stat files (as of 2.6.30-rc7)
307 307
   blkio_ticks   time spent waiting for block IO
308 308
   gtime         guest time of the task in jiffies
309 309
   cgtime        guest time of the task children in jiffies
  310
+  start_data    address above which program data+bss is placed
  311
+  end_data      address below which program data+bss is placed
  312
+  start_brk     address above which program heap can be expanded with brk()
310 313
 ..............................................................................
311 314
 
312 315
 The /proc/PID/maps file containing the currently mapped memory regions and
7  fs/proc/array.c
@@ -464,7 +464,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
464 464
 
465 465
 	seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
466 466
 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
467  
-%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
  467
+%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu\n",
468 468
 		pid_nr_ns(pid, ns),
469 469
 		tcomm,
470 470
 		state,
@@ -511,7 +511,10 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
511 511
 		task->policy,
512 512
 		(unsigned long long)delayacct_blkio_ticks(task),
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 		cputime_to_clock_t(gtime),
514  
-		cputime_to_clock_t(cgtime));
  514
+		cputime_to_clock_t(cgtime),
  515
+		(mm && permitted) ? mm->start_data : 0,
  516
+		(mm && permitted) ? mm->end_data : 0,
  517
+		(mm && permitted) ? mm->start_brk : 0);
515 518
 	if (mm)
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 		mmput(mm);
517 520
 	return 0;

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