Oleg Nesterov 6d08f2c713 proc: make sure mem_open() doesn't pin the target's memory ...

Once /proc/pid/mem is opened, the memory can't be released until
mem_release() even if its owner exits.

Change mem_open() to do atomic_inc(mm_count) + mmput(), this only
pins mm_struct. Change mem_rw() to do atomic_inc_not_zero(mm_count)
before access_remote_vm(), this verifies that this mm is still alive.

I am not sure what should mem_rw() return if atomic_inc_not_zero()
fails. With this patch it returns zero to match the "mm == NULL" case,
may be it should return -EINVAL like it did before e268337d.

Perhaps it makes sense to add the additional fatal_signal_pending()
check into the main loop, to ensure we do not hold this memory if
the target task was oom-killed.

Cc: stable@kernel.org
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-02-01 14:39:01 -08:00

..

array.c

Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security

2012-01-14 18:36:33 -08:00

base.c

proc: make sure mem_open() doesn't pin the target's memory

2012-02-01 14:39:01 -08:00

cmdline.c

proc: switch /proc/cmdline to seq_file

2008-10-23 14:29:04 +04:00

consoles.c

console: rename acquire/release_console_sem() to console_lock/unlock()

2011-01-26 10:50:06 +10:00

cpuinfo.c

proc: move /proc/cpuinfo code to fs/proc/cpuinfo.c

2008-10-23 15:05:11 +04:00

devices.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

generic.c

switch procfs to umode_t use

2012-01-03 22:54:56 -05:00

inode.c

procfs: add hidepid= and gid= mount options

2012-01-10 16:30:54 -08:00

internal.h

procfs: parse mount options

2012-01-10 16:30:54 -08:00

interrupts.c

proc: move /proc/interrupts boilerplate code to fs/proc/interrupts.c

2008-10-23 15:15:46 +04:00

Kconfig

kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT

2011-01-20 17:02:05 -08:00

kcore.c

/proc/kcore: fix seeking

2011-01-13 08:03:17 -08:00

kmsg.c

procfs: Use generic_file_llseek in /proc/kmsg

2010-04-09 16:35:41 +02:00

loadavg.c

sched, timers: cleanup avenrun users

2009-05-15 15:32:45 +02:00

Makefile

ns: proc files for namespace naming policy.

2011-05-10 14:31:44 -07:00

meminfo.c

fs/proc/meminfo.c: fix compilation error

2011-12-09 07:50:28 -08:00

mmu.c

fs/proc/mmu.c: headers butchery

2007-10-17 08:42:48 -07:00

namespaces.c

vfs: trim includes a bit

2012-01-03 22:57:13 -05:00

nommu.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

page.c

thp: remove PG_buddy

2011-01-13 17:32:43 -08:00

proc_devtree.c

of/flattree: Drop an uninteresting message to pr_debug level

2011-03-02 13:45:18 -07:00

proc_net.c

switch procfs to umode_t use

2012-01-03 22:54:56 -05:00

proc_sysctl.c

Merge branch 'akpm' (Andrew's incoming - part two)

2011-11-02 16:07:27 -07:00

proc_tty.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

root.c

procfs: add hidepid= and gid= mount options

2012-01-10 16:30:54 -08:00

softirqs.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

stat.c

sched/accounting, proc: Fix /proc/stat interrupts sum

2012-01-16 08:13:27 +01:00

task_mmu.c

proc: clear_refs: do not clear reserved pages

2012-01-23 08:38:48 -08:00

task_nommu.c

report errors in /proc/*/*map* sanely

2011-03-23 16:36:50 -04:00

uptime.c

Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into cputime-tip

2011-12-19 19:23:15 +01:00

version.c

proc: switch /proc/version to seq_file

2008-10-23 14:19:58 +04:00

vmcore.c

fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros

2011-10-31 19:30:31 -04:00