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Kernel: Keep the user pointer const through copy_from_user()
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apio 2023-01-11 19:26:53 +01:00
parent 6e4cd6300d
commit 79a5b98d65
Signed by: apio
GPG Key ID: B8A7D06E42258954
1 changed files with 3 additions and 3 deletions
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6
kernel/src/memory/MemoryManager.cpp
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@ -466,7 +466,7 @@ namespace MemoryManager
// Userspace pointer not aligned on page boundary
if (user_ptr != user_page)
{
if (!validate_user_writable_page(user_page)) return false;
if (!validate_user_readable_page(user_page)) return false;
}
while (size--)
@ -474,10 +474,10 @@ namespace MemoryManager
// Crossed a page boundary, gotta check the page tables again before touching any memory!!
if (user_ptr % ARCH_PAGE_SIZE)
{
if (!validate_user_writable_page(user_ptr)) return false;
if (!validate_user_readable_page(user_ptr)) return false;
}
*kernel_ptr++ = *(char*)user_ptr;
*kernel_ptr++ = *(const char*)user_ptr;
user_ptr++;
}