syscalls/mbind.c

   1 /*
   2  * SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len,
   3         unsigned long, mode, unsigned long __user *, nmask,
   4         unsigned long, maxnode, unsigned, flags)
   5  */
   6
   7 #include <linux/mempolicy.h>
   8 #include "arch.h"
   9 #include "maps.h"
  10 #include "random.h"
  11 #include "sanitise.h"
  12 #include "shm.h"
  13
  14 #define MPOL_F_STATIC_NODES     (1 << 15)
  15 #define MPOL_F_RELATIVE_NODES   (1 << 14)
  16
  17 static void sanitise_mbind(int childno)
  18 {
  19         unsigned long maxnode;
  20
  21         (void) common_set_mmap_ptr_len(childno);
  22
  23 retry_maxnode:
  24         shm->syscall[childno].a5 &= ~((page_size * 8) - 1);
  25
  26         maxnode = shm->syscall[childno].a5;
  27
  28         if (maxnode < 2 || maxnode > (page_size * 8)) {
  29                 shm->syscall[childno].a5 = rand32();
  30                 goto retry_maxnode;
  31         }
  32 }
  33
  34
  35 struct syscallentry syscall_mbind = {
  36         .name = "mbind",
  37         .num_args = 6,
  38         .arg1name = "start",
  39         .arg1type = ARG_MMAP,
  40
  41         .arg2name = "len",
  42
  43         .arg3name = "mode",
  44         .arg3type = ARG_LIST,
  45         .arg3list = {
  46                 .num = 4,
  47                 .values = { MPOL_DEFAULT, MPOL_BIND, MPOL_INTERLEAVE, MPOL_PREFERRED },
  48         },
  49
  50         .arg4name = "nmask",
  51         .arg4type = ARG_ADDRESS,
  52
  53         .arg5name = "maxnode",
  54         .arg5type = ARG_RANGE,
  55         .low5range = 0,
  56         .hi5range = 32,
  57
  58         .arg6name = "flags",
  59         .arg6type = ARG_LIST,
  60         .arg6list = {
  61                 .num = 2,
  62                 .values = { MPOL_F_STATIC_NODES, MPOL_F_RELATIVE_NODES },
  63         },
  64         .sanitise = sanitise_mbind,
  65         .group = GROUP_VM,
  66 };