KAMEZAWA Hiroyuki 9e7814404b hold task->mempolicy while numa_maps scans. ...

/proc/<pid>/numa_maps scans vma and show mempolicy under
  mmap_sem. It sometimes accesses task->mempolicy which can
  be freed without mmap_sem and numa_maps can show some
  garbage while scanning.

This patch tries to take reference count of task->mempolicy at reading
numa_maps before calling get_vma_policy(). By this, task->mempolicy
will not be freed until numa_maps reaches its end.

V2->v3
  -  updated comments to be more verbose.
  -  removed task_lock() in numa_maps code.
V1->V2
  -  access task->mempolicy only once and remember it.  Becase kernel/exit.c
     can overwrite it.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-10-19 14:32:10 -07:00

..

array.c

c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat

2012-05-31 17:49:32 -07:00

base.c

procfs: don't need a PATH_MAX allocation to hold a string representation of an int

2012-10-12 20:15:10 -04:00

cmdline.c

…

consoles.c

…

cpuinfo.c

…

devices.c

…

fd.c

don't leak O_CLOEXEC into ->f_flags

2012-09-26 21:10:01 -04:00

fd.h

procfs: Move /proc/pid/fd[info] handling code to fd.[ch]

2012-09-26 21:10:01 -04:00

generic.c

proc: use kzalloc instead of kmalloc and memset

2012-10-06 03:05:18 +09:00

inode.c

proc: no need to initialize proc_inode->fd in proc_get_inode()

2012-10-06 03:05:18 +09:00

internal.h

hold task->mempolicy while numa_maps scans.

2012-10-19 14:32:10 -07:00

interrupts.c

…

Kconfig

…

kcore.c

fs/proc/kcore.c: make get_sparsemem_vmemmap_info() static

2012-03-23 16:58:42 -07:00

kmsg.c

…

loadavg.c

…

Makefile

procfs: Move /proc/pid/fd[info] handling code to fd.[ch]

2012-09-26 21:10:01 -04:00

meminfo.c

…

mmu.c

…

namespaces.c

stop passing nameidata to ->lookup()

2012-07-14 16:34:32 +04:00

nommu.c

…

page.c

kpageflags: fix wrong KPF_THP on non-huge compound pages

2012-10-09 16:23:00 +09:00

proc_devtree.c

of: Improve prom_update_property() function

2012-07-11 15:26:51 +10:00

proc_net.c

stop passing nameidata to ->lookup()

2012-07-14 16:34:32 +04:00

proc_sysctl.c

rbtree: fix incorrect rbtree node insertion in fs/proc/proc_sysctl.c

2012-10-09 16:22:32 +09:00

proc_tty.c

…

root.c

fs/proc/root.c: use NULL instead of 0 for pointer

2012-10-06 03:05:19 +09:00

softirqs.c

…

stat.c

proc: stats: Use arch_idle_time for idle and iowait times if available

2012-03-30 15:43:33 +02:00

task_mmu.c

hold task->mempolicy while numa_maps scans.

2012-10-19 14:32:10 -07:00

task_nommu.c

proc: remove mm_for_maps()

2012-05-31 17:49:28 -07:00

uptime.c

…

version.c

…

vmcore.c

fadump: Introduce cleanup routine to invalidate /proc/vmcore.

2012-02-23 10:50:02 +11:00