syscalls/sync_file_range.c

   1 /*
   2  * SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes, unsigned int flags)
   3  * SYSCALL_DEFINE(sync_file_range2)(int fd, unsigned int flags, loff_t offset, loff_t nbytes)
   4  */
   5 #include <linux/fs.h>
   6 #include <fcntl.h>
   7 #include <string.h>
   8 #include <stdlib.h>
   9 #include "arch.h"
  10 #include "random.h"
  11 #include "sanitise.h"
  12 #include "shm.h"
  13 #include "tables.h"
  14
  15 static void sanitise_sync_file_range(int childno)
  16 {
  17         long endbyte;
  18         loff_t nbytes;
  19         loff_t off;
  20
  21 retry:
  22         off = rand64() & 0x0fffffffffffffffUL;
  23         nbytes = rand64() & 0x0fffffffffffffffUL;
  24         endbyte = off + nbytes;
  25         if (endbyte < off)
  26                 goto retry;
  27
  28         if (off >= (0x100000000LL << PAGE_SHIFT))
  29                 goto retry;
  30
  31         if (this_syscallname("sync_file_range2", childno) == FALSE) {
  32                 shm->syscall[childno].a2 = off;
  33                 shm->syscall[childno].a3 = nbytes;
  34         } else {
  35                 shm->syscall[childno].a3 = off;
  36                 shm->syscall[childno].a4 = nbytes;
  37         }
  38 }
  39
  40 struct syscallentry syscall_sync_file_range = {
  41         .name = "sync_file_range",
  42         .num_args = 4,
  43         .sanitise = sanitise_sync_file_range,
  44         .arg1name = "fd",
  45         .arg1type = ARG_FD,
  46         .arg2name = "offset",
  47         .arg3name = "nbytes",
  48         .arg3type = ARG_LEN,
  49         .arg4name = "flags",
  50         .arg4type = ARG_LIST,
  51         .arg4list = {
  52                 .num = 3,
  53                 .values = { SYNC_FILE_RANGE_WAIT_BEFORE, SYNC_FILE_RANGE_WRITE, SYNC_FILE_RANGE_WAIT_AFTER },
  54         },
  55         .flags = NEED_ALARM,
  56         .group = GROUP_VFS,
  57 };
  58
  59 /*
  60  * ARM & PowerPC have different argument order.
  61  * See edd5cd4a9424f22b0fa08bef5e299d41befd5622 in kernel tree.
  62  */
  63 struct syscallentry syscall_sync_file_range2 = {
  64         .name = "sync_file_range2",
  65         .num_args = 4,
  66         .sanitise = sanitise_sync_file_range,
  67         .arg1name = "fd",
  68         .arg1type = ARG_FD,
  69         .arg2name = "flags",
  70         .arg2type = ARG_LIST,
  71         .arg2list = {
  72                 .num = 3,
  73                 .values = { SYNC_FILE_RANGE_WAIT_BEFORE, SYNC_FILE_RANGE_WRITE, SYNC_FILE_RANGE_WAIT_AFTER },
  74         },
  75         .arg3name = "offset",
  76         .arg4name = "nbytes",
  77         .arg4type = ARG_LEN,
  78         .flags = NEED_ALARM,
  79         .group = GROUP_VFS,
  80 };