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mprotect: return -ENOMEM if speicified range is out of range

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NAKAMURA Gou
2016-03-15 13:54:42 +09:00
parent 15f572ef9c
commit 1a3bc851af
1 changed files with 9 additions and 5 deletions
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14
kernel/syscall.c
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@ -1228,16 +1228,20 @@ SYSCALL_DECLARE(mprotect)
end = start + len; end = start + len;
/* check arguments */ /* check arguments */
if ((start & (PAGE_SIZE - 1)) if (start & (PAGE_SIZE - 1)) {
|| (start < region->user_start)
|| (region->user_end <= start)
|| (len > (region->user_end - region->user_start)
|| ((region->user_end - len) < start))) {
ekprintf("[%d]sys_mprotect(%lx,%lx,%x): -EINVAL\n", ekprintf("[%d]sys_mprotect(%lx,%lx,%x): -EINVAL\n",
ihk_mc_get_processor_id(), start, len0, prot); ihk_mc_get_processor_id(), start, len0, prot);
return -EINVAL; return -EINVAL;
} }
if ((start < region->user_start)
|| (region->user_end <= start)
|| ((region->user_end - start) < len)) {
ekprintf("[%d]sys_mprotect(%lx,%lx,%x): -ENOMEM\n",
ihk_mc_get_processor_id(), start, len0, prot);
return -ENOMEM;
}
if (len == 0) { if (len == 0) {
/* nothing to do */ /* nothing to do */
return 0; return 0;