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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/uaccess.h>
#include <linux/kernel.h>
#ifdef CONFIG_X86_64
static __always_inline u64 canonical_address(u64 vaddr, u8 vaddr_bits)
{
return ((s64)vaddr << (64 - vaddr_bits)) >> (64 - vaddr_bits);
}
static __always_inline bool invalid_probe_range(u64 vaddr)
{
/*
* Range covering the highest possible canonical userspace address
* as well as non-canonical address range. For the canonical range
* we also need to include the userspace guard page.
*/
return vaddr < TASK_SIZE_MAX + PAGE_SIZE ||
canonical_address(vaddr, boot_cpu_data.x86_virt_bits) != vaddr;
}
#else
static __always_inline bool invalid_probe_range(u64 vaddr)
{
return vaddr < TASK_SIZE_MAX;
}
#endif
long probe_kernel_read_strict(void *dst, const void *src, size_t size)
{
if (unlikely(invalid_probe_range((unsigned long)src)))
return -EFAULT;
return __probe_kernel_read(dst, src, size);
}
long strncpy_from_unsafe_strict(char *dst, const void *unsafe_addr, long count)
{
if (unlikely(invalid_probe_range((unsigned long)unsafe_addr)))
return -EFAULT;
return __strncpy_from_unsafe(dst, unsafe_addr, count);
}
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