https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: a430d95c5efa2b545d26a094eb5f624e36732af0 authored by Linus Torvalds on 16 September 2024, 16:19:47 UTC
Merge tag 'lsm-pr-20240911' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Merge tag 'lsm-pr-20240911' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Tip revision: a430d95
maccess.c
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <asm/vsyscall.h>
#ifdef CONFIG_X86_64
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
{
unsigned long vaddr = (unsigned long)unsafe_src;
/*
* Do not allow userspace addresses. This disallows
* normal userspace and the userspace guard page:
*/
if (vaddr < TASK_SIZE_MAX + PAGE_SIZE)
return false;
/*
* Reading from the vsyscall page may cause an unhandled fault in
* certain cases. Though it is at an address above TASK_SIZE_MAX, it is
* usually considered as a user space address.
*/
if (is_vsyscall_vaddr(vaddr))
return false;
/*
* Allow everything during early boot before 'x86_virt_bits'
* is initialized. Needed for instruction decoding in early
* exception handlers.
*/
if (!boot_cpu_data.x86_virt_bits)
return true;
return __is_canonical_address(vaddr, boot_cpu_data.x86_virt_bits);
}
#else
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
{
return (unsigned long)unsafe_src >= TASK_SIZE_MAX;
}
#endif