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ntdll: Make sure that the virtual heap doesn't overlap the preloader range. 

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50963
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2021-04-23 17:19:26 +02:00
parent 126a14ac9a
commit 2e0a96a483
1 changed files with 14 additions and 2 deletions
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16
dlls/ntdll/unix/virtual.c
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@ -2575,11 +2575,23 @@ struct alloc_virtual_heap
static int CDECL alloc_virtual_heap( void *base, SIZE_T size, void *arg )
{
struct alloc_virtual_heap *alloc = arg;
void *end = (char *)base + size;
if (is_beyond_limit( base, size, address_space_limit )) address_space_limit = (char *)base + size;
if (size < alloc->size) return 0;
if (is_win64 && base < (void *)0x80000000) return 0;
alloc->base = anon_mmap_fixed( (char *)base + size - alloc->size, alloc->size, PROT_READ|PROT_WRITE, 0 );
if (preload_reserve_end >= end)
{
if (preload_reserve_start <= base) return 0; /* no space in that area */
if (preload_reserve_start < end) end = preload_reserve_start;
}
else if (preload_reserve_end > base)
{
if (preload_reserve_start <= base) base = preload_reserve_end;
else if ((char *)end - (char *)preload_reserve_end >= alloc->size) base = preload_reserve_end;
else end = preload_reserve_start;
}
if ((char *)end - (char *)base < alloc->size) return 0;
alloc->base = anon_mmap_fixed( (char *)end - alloc->size, alloc->size, PROT_READ|PROT_WRITE, 0 );
return (alloc->base != MAP_FAILED);
}