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24 lines
704 B
24 lines
704 B
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/uaccess.h> |
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#include <linux/kernel.h> |
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#ifdef CONFIG_X86_64 |
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bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) |
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{ |
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unsigned long vaddr = (unsigned long)unsafe_src; |
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/* |
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* Range covering the highest possible canonical userspace address |
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* as well as non-canonical address range. For the canonical range |
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* we also need to include the userspace guard page. |
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*/ |
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return vaddr >= TASK_SIZE_MAX + PAGE_SIZE && |
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__is_canonical_address(vaddr, boot_cpu_data.x86_virt_bits); |
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} |
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#else |
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bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) |
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{ |
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return (unsigned long)unsafe_src >= TASK_SIZE_MAX; |
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} |
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#endif
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