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mmap, mremap: Check arguments in the same order as in Linux

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Refs: #1137
Change-Id: I4fd2ac83b013a2741a3facce4dd7e0c37b14fd25
This commit is contained in:
Ken Sato
2018-06-27 11:43:42 +09:00
committed by Dominique Martinet
parent f185be06eb
commit 11756d96ef
3 changed files with 25 additions and 13 deletions
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28
kernel/syscall.c
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@ -7729,6 +7729,7 @@ SYSCALL_DECLARE(mremap)
oldaddr, oldsize0, newsize0, flags, newaddr);
ihk_mc_spinlock_lock_noirq(&vm->memory_range_lock);
/* check arguments */
if ((oldaddr & ~PAGE_MASK)
|| (oldsize < 0)
|| (newsize <= 0)
@ -7744,6 +7745,24 @@ SYSCALL_DECLARE(mremap)
goto out;
}
if (oldend < oldstart) {
error = -EINVAL;
ekprintf("sys_mremap(%#lx,%#lx,%#lx,%#x,%#lx):"
"old range overflow. %d\n",
oldaddr, oldsize0, newsize0,
flags, newaddr, error);
goto out;
}
if (newsize > (vm->region.user_end - vm->region.user_start)) {
error = -ENOMEM;
ekprintf("sys_mremap(%#lx,%#lx,%#lx,%#x,%#lx):"
"cannot allocate. %d\n",
oldaddr, oldsize0, newsize0,
flags, newaddr, error);
goto out;
}
/* check original mapping */
range = lookup_process_memory_range(vm, oldstart, oldstart+PAGE_SIZE);
if (!range || (oldstart < range->start) || (range->end < oldend)
@ -7758,15 +7777,6 @@ SYSCALL_DECLARE(mremap)
goto out;
}
if (oldend < oldstart) {
error = -EINVAL;
ekprintf("sys_mremap(%#lx,%#lx,%#lx,%#x,%#lx):"
"old range overflow. %d\n",
oldaddr, oldsize0, newsize0, flags, newaddr,
error);
goto out;
}
/* determine new mapping range */
need_relocate = 0;
if (flags & MREMAP_FIXED) {