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fix(lwp): reject wrapped user copy ranges

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This commit is contained in:
AFWEF_147
2026-03-23 12:09:55 +00:00
committed by Rbb666
parent 6fa12d5dd8
commit 9c8b58f482
1 changed files with 35 additions and 18 deletions
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components/lwp/lwp_user_mm.c
+35 -18
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@@ -672,21 +672,46 @@ void *lwp_mremap(struct rt_lwp *lwp, void *old_address, size_t old_size,
return rt_aspace_mremap_range(lwp->aspace, old_address, old_size, new_size, flags, new_address);
}
static rt_bool_t _lwp_user_range_is_valid(const void *addr, size_t size)
{
uintptr_t start;
uintptr_t end;
if (addr == RT_NULL)
{
return RT_FALSE;
}
start = (uintptr_t)addr;
if (start < (uintptr_t)USER_VADDR_START)
{
return RT_FALSE;
}
if (start >= (uintptr_t)USER_VADDR_TOP)
{
return RT_FALSE;
}
end = start + size;
if (end < start)
{
return RT_FALSE;
}
if (end > (uintptr_t)USER_VADDR_TOP)
{
return RT_FALSE;
}
return RT_TRUE;
}
size_t lwp_get_from_user(void *dst, void *src, size_t size)
{
struct rt_lwp *lwp = RT_NULL;
/* check src */
if (src < (void *)USER_VADDR_START)
{
return 0;
}
if (src >= (void *)USER_VADDR_TOP)
{
return 0;
}
if ((void *)((char *)src + size) > (void *)USER_VADDR_TOP)
if (!_lwp_user_range_is_valid(src, size))
{
return 0;
}
@@ -705,15 +730,7 @@ size_t lwp_put_to_user(void *dst, void *src, size_t size)
struct rt_lwp *lwp = RT_NULL;
/* check dst */
if (dst < (void *)USER_VADDR_START)
{
return 0;
}
if (dst >= (void *)USER_VADDR_TOP)
{
return 0;
}
if ((void *)((char *)dst + size) > (void *)USER_VADDR_TOP)
if (!_lwp_user_range_is_valid(dst, size))
{
return 0;
}