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    Annotation of /trunk/kernel26-magellan/patches-2.6.17-r6/0010-2.6.17-sched-limit_policy_changes.patch

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    Revision 105 - (hide annotations) (download)
    Sun Mar 11 16:17:56 2007 UTC (17 years, 2 months ago) by niro
    File size: 2425 byte(s) 
    2.6.17-magellan-r6
    1 niro 105 Many applications explicitly set SCHED_NORMAL on threads thus undoing the
    2     usefulness of the SCHED_ISO, SCHED_BATCH and SCHED_IDLEPRIO policies.
    3    
    4     For unprivileged users:
    5    
    6     Only allow non realtime policies to be downgraded from ISO->BATCH->IDLEPRIO
    7     but not back to NORMAL.
    8    
    9     Signed-off-by: Con Kolivas <kernel@kolivas.org>
    10    
    11     ---
    12     kernel/sched.c | 52 +++++++++++++++++++++++++++++++++++++++-------------
    13     1 files changed, 39 insertions(+), 13 deletions(-)
    14    
    15     Index: linux-ck-dev/kernel/sched.c
    16     ===================================================================
    17     --- linux-ck-dev.orig/kernel/sched.c 2006-06-18 15:23:46.000000000 +1000
    18     +++ linux-ck-dev/kernel/sched.c 2006-06-18 15:23:49.000000000 +1000
    19     @@ -3700,19 +3700,44 @@ recheck:
    20     * Allow unprivileged RT tasks to decrease priority:
    21     */
    22     if (!capable(CAP_SYS_NICE)) {
    23     - /*
    24     - * can't change policy, except between SCHED_NORMAL
    25     - * and SCHED_BATCH:
    26     - */
    27     - if (SCHED_RT(policy) && policy != p->policy &&
    28     - !p->signal->rlim[RLIMIT_RTPRIO].rlim_cur)
    29     - return -EPERM;
    30     - /* can't increase priority */
    31     - if (SCHED_RT(policy) &&
    32     - param->sched_priority > p->rt_priority &&
    33     - param->sched_priority >
    34     - p->signal->rlim[RLIMIT_RTPRIO].rlim_cur)
    35     - return -EPERM;
    36     + if (SCHED_RT(policy)) {
    37     + /*
    38     + * can't change policy to a realtime policy
    39     + */
    40     + if (policy != p->policy &&
    41     + !p->signal->rlim[RLIMIT_RTPRIO].rlim_cur)
    42     + return -EPERM;
    43     + /* can't increase priority */
    44     + if (param->sched_priority > p->rt_priority &&
    45     + param->sched_priority >
    46     + p->signal->rlim[RLIMIT_RTPRIO].rlim_cur)
    47     + return -EPERM;
    48     + } else {
    49     + switch (p->policy) {
    50     + /*
    51     + * Can only downgrade policies but not back to
    52     + * SCHED_NORMAL
    53     + */
    54     + case SCHED_ISO:
    55     + if (policy == SCHED_ISO)
    56     + goto out;
    57     + if (policy == SCHED_NORMAL)
    58     + return -EPERM;
    59     + break;
    60     + case SCHED_BATCH:
    61     + if (policy == SCHED_BATCH)
    62     + goto out;
    63     + if (policy != SCHED_IDLEPRIO)
    64     + return -EPERM;
    65     + break;
    66     + case SCHED_IDLEPRIO:
    67     + if (policy == SCHED_IDLEPRIO)
    68     + goto out;
    69     + return -EPERM;
    70     + default:
    71     + break;
    72     + }
    73     + }
    74     /* can't change other user's priorities */
    75     if ((current->euid != p->euid) &&
    76     (current->euid != p->uid))
    77     @@ -3756,6 +3781,7 @@ recheck:
    78     preempt(p, rq);
    79     }
    80     task_rq_unlock(rq, &flags);
    81     +out:
    82     return 0;
    83     }
    84     EXPORT_SYMBOL_GPL(sched_setscheduler);