[lkml]   [2012]   [Feb]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [RFC][PATCH] fix move/migrate_pages() race on task struct
    On 02/24/2012 07:20 AM, Christoph Lameter wrote:
    > Subject: migration: Do not do rcu_read_unlock until the last time we need the task_struct pointer
    > Migration functions perform the rcu_read_unlock too early. As a result the
    > task pointed to may change. Bugs were introduced when adding security checks
    > because rcu_unlock/lock sequences were inserted. Plus the security checks
    > and do_move_pages used the task_struct pointer after rcu_unlock.
    > Fix those issues by removing the unlock/lock sequences and moving the
    > rcu_read_unlock after the last use of the task struct pointer.
    > Signed-off-by: Christoph Lameter <>

    It doesn't fix the code duplication, but it definitely does fix the bug
    I was originally trying to address.

    Acked-by: Dave Hansen <>

     \ /
      Last update: 2012-02-24 17:51    [W:0.051 / U:0.468 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site