Oleg Nesterov 46c298cf69 fs/proc/task_mmu.c: don't use task->mm in m_start() and show_*map() ...

get_gate_vma(priv->task->mm) looks ugly and wrong, task->mm can be NULL or
it can changed by exec right after mm_access().

And in theory this race is not harmless, the task can exec and then later
exit and free the new mm_struct.  In this case get_task_mm(oldmm) can't
help, get_gate_vma(task->mm) can read the freed/unmapped memory.

I think that priv->task should simply die and hold_task_mempolicy() logic
can be simplified.  tail_vma logic asks for cleanups too.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
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>

2014-10-09 22:25:48 -04:00

..

array.c

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

2014-08-06 08:06:39 -07:00

base.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2014-08-09 17:10:41 -07:00

cmdline.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

consoles.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

cpuinfo.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

devices.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

fd.c

proc: add and remove /proc entry create checks

2014-08-08 15:57:22 -07:00

fd.h

…

generic.c

proc: make proc_subdir_lock static

2014-08-08 15:57:22 -07:00

inode.c

proc: Implement /proc/thread-self to point at the directory of the current thread

2014-08-04 10:07:11 -07:00

internal.h

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2014-08-09 17:10:41 -07:00

interrupts.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

Kconfig

kcore: add Kconfig help text

2013-11-13 12:09:33 +09:00

kcore.c

fs/proc/kcore.c: use PAGE_ALIGN instead of ALIGN(PAGE_SIZE)

2014-08-08 15:57:22 -07:00

kmsg.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

loadavg.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

Makefile

proc: Implement /proc/thread-self to point at the directory of the current thread

2014-08-04 10:07:11 -07:00

meminfo.c

mm: export NR_SHMEM via sysinfo(2) / si_meminfo() interfaces

2014-08-06 18:01:19 -07:00

namespaces.c

new helper: readlink_copy()

2014-04-01 23:19:15 -04:00

nommu.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

page.c

mm: close PageTail race

2014-03-04 07:55:47 -08:00

proc_net.c

Revert "proc: Point /proc/{mounts,net} at /proc/thread-self/{mounts,net} instead of /proc/self/{mounts,net}"

2014-08-10 21:24:59 -07:00

proc_sysctl.c

sysctl: remove typedef ctl_table

2014-08-08 15:57:24 -07:00

proc_tty.c

proc: remove proc_tty_ldisc variable

2014-08-08 15:57:22 -07:00

root.c

Revert "proc: Point /proc/{mounts,net} at /proc/thread-self/{mounts,net} instead of /proc/self/{mounts,net}"

2014-08-10 21:24:59 -07:00

self.c

new helper: readlink_copy()

2014-04-01 23:19:15 -04:00

softirqs.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

stat.c

/proc/stat: convert to single_open_size()

2014-07-03 09:21:54 -07:00

task_mmu.c

fs/proc/task_mmu.c: don't use task->mm in m_start() and show_*map()

2014-10-09 22:25:48 -04:00

task_nommu.c

seq_file: remove "%n" usage from seq_file users

2013-11-15 09:32:20 +09:00

thread_self.c

proc: Implement /proc/thread-self to point at the directory of the current thread

2014-08-04 10:07:11 -07:00

uptime.c

cputime: Default implementation of nsecs -> cputime conversion

2014-03-13 15:56:43 +01:00

version.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

vmcore.c

fs/proc/vmcore.c:mmap_vmcore: skip non-ram pages reported by hypervisors

2014-08-08 15:57:23 -07:00