468 lines
12 KiB
C
468 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PARISC specific syscalls
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*
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
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* Copyright (C) 1999-2020 Helge Deller <deller@gmx.de>
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*/
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#include <linux/uaccess.h>
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#include <asm/elf.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/linkage.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/mm.h>
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#include <linux/shm.h>
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#include <linux/syscalls.h>
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#include <linux/utsname.h>
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#include <linux/personality.h>
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#include <linux/random.h>
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#include <linux/compat.h>
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/* we construct an artificial offset for the mapping based on the physical
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* address of the kernel mapping variable */
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#define GET_LAST_MMAP(filp) \
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(filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL)
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#define SET_LAST_MMAP(filp, val) \
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{ /* nothing */ }
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static int get_offset(unsigned int last_mmap)
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{
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return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT;
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}
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static unsigned long shared_align_offset(unsigned int last_mmap,
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unsigned long pgoff)
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{
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return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT;
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}
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static inline unsigned long COLOR_ALIGN(unsigned long addr,
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unsigned int last_mmap, unsigned long pgoff)
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{
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unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
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unsigned long off = (SHM_COLOUR-1) &
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(shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT);
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return base + off;
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}
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#define STACK_SIZE_DEFAULT (USER_WIDE_MODE \
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? (1 << 30) /* 1 GB */ \
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: (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))
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unsigned long calc_max_stack_size(unsigned long stack_max)
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{
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#ifdef CONFIG_COMPAT
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if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))
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stack_max = STACK_SIZE_DEFAULT;
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else
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#endif
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if (stack_max == RLIM_INFINITY)
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stack_max = STACK_SIZE_DEFAULT;
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return stack_max;
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}
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/*
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* Top of mmap area (just below the process stack).
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*/
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/*
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* When called from arch_get_unmapped_area(), rlim_stack will be NULL,
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* indicating that "current" should be used instead of a passed-in
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* value from the exec bprm as done with arch_pick_mmap_layout().
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*/
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static unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
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{
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unsigned long stack_base;
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/* Limit stack size - see setup_arg_pages() in fs/exec.c */
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stack_base = rlim_stack ? rlim_stack->rlim_max
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: rlimit_max(RLIMIT_STACK);
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stack_base = calc_max_stack_size(stack_base);
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/* Add space for stack randomization. */
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if (current->flags & PF_RANDOMIZE)
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stack_base += (STACK_RND_MASK << PAGE_SHIFT);
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return PAGE_ALIGN(STACK_TOP - stack_base);
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}
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma, *prev;
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unsigned long task_size = TASK_SIZE;
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int do_color_align, last_mmap;
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struct vm_unmapped_area_info info;
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if (len > task_size)
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return -ENOMEM;
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do_color_align = 0;
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if (filp || (flags & MAP_SHARED))
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do_color_align = 1;
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last_mmap = GET_LAST_MMAP(filp);
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if (flags & MAP_FIXED) {
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if ((flags & MAP_SHARED) && last_mmap &&
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(addr - shared_align_offset(last_mmap, pgoff))
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& (SHM_COLOUR - 1))
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return -EINVAL;
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goto found_addr;
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}
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if (addr) {
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if (do_color_align && last_mmap)
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addr = COLOR_ALIGN(addr, last_mmap, pgoff);
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else
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addr = PAGE_ALIGN(addr);
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vma = find_vma_prev(mm, addr, &prev);
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if (task_size - len >= addr &&
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(!vma || addr + len <= vm_start_gap(vma)) &&
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(!prev || addr >= vm_end_gap(prev)))
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goto found_addr;
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}
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info.flags = 0;
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info.length = len;
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info.low_limit = mm->mmap_legacy_base;
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info.high_limit = mmap_upper_limit(NULL);
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info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
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info.align_offset = shared_align_offset(last_mmap, pgoff);
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addr = vm_unmapped_area(&info);
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found_addr:
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if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
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SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
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return addr;
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}
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unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
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const unsigned long len, const unsigned long pgoff,
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const unsigned long flags)
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{
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struct vm_area_struct *vma, *prev;
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struct mm_struct *mm = current->mm;
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unsigned long addr = addr0;
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int do_color_align, last_mmap;
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struct vm_unmapped_area_info info;
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/* requested length too big for entire address space */
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if (len > TASK_SIZE)
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return -ENOMEM;
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do_color_align = 0;
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if (filp || (flags & MAP_SHARED))
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do_color_align = 1;
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last_mmap = GET_LAST_MMAP(filp);
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if (flags & MAP_FIXED) {
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if ((flags & MAP_SHARED) && last_mmap &&
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(addr - shared_align_offset(last_mmap, pgoff))
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& (SHM_COLOUR - 1))
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return -EINVAL;
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goto found_addr;
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}
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/* requesting a specific address */
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if (addr) {
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if (do_color_align && last_mmap)
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addr = COLOR_ALIGN(addr, last_mmap, pgoff);
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else
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addr = PAGE_ALIGN(addr);
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vma = find_vma_prev(mm, addr, &prev);
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if (TASK_SIZE - len >= addr &&
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(!vma || addr + len <= vm_start_gap(vma)) &&
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(!prev || addr >= vm_end_gap(prev)))
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goto found_addr;
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}
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = PAGE_SIZE;
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info.high_limit = mm->mmap_base;
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info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
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info.align_offset = shared_align_offset(last_mmap, pgoff);
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addr = vm_unmapped_area(&info);
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if (!(addr & ~PAGE_MASK))
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goto found_addr;
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VM_BUG_ON(addr != -ENOMEM);
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/*
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* A failed mmap() very likely causes application failure,
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* so fall back to the bottom-up function here. This scenario
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* can happen with large stack limits and large mmap()
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* allocations.
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*/
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return arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
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found_addr:
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if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
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SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
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return addr;
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}
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static int mmap_is_legacy(void)
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{
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if (current->personality & ADDR_COMPAT_LAYOUT)
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return 1;
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/* parisc stack always grows up - so a unlimited stack should
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* not be an indicator to use the legacy memory layout.
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* if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
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* return 1;
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*/
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return sysctl_legacy_va_layout;
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}
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static unsigned long mmap_rnd(void)
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{
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unsigned long rnd = 0;
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if (current->flags & PF_RANDOMIZE)
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rnd = get_random_u32() & MMAP_RND_MASK;
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return rnd << PAGE_SHIFT;
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}
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unsigned long arch_mmap_rnd(void)
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{
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return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT;
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}
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static unsigned long mmap_legacy_base(void)
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{
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return TASK_UNMAPPED_BASE + mmap_rnd();
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}
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/*
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* This function, called very early during the creation of a new
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* process VM image, sets up which VM layout function to use:
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*/
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void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
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{
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mm->mmap_legacy_base = mmap_legacy_base();
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mm->mmap_base = mmap_upper_limit(rlim_stack);
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if (mmap_is_legacy()) {
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mm->mmap_base = mm->mmap_legacy_base;
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mm->get_unmapped_area = arch_get_unmapped_area;
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} else {
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mm->get_unmapped_area = arch_get_unmapped_area_topdown;
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}
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}
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asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long pgoff)
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{
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/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
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we have. */
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return ksys_mmap_pgoff(addr, len, prot, flags, fd,
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pgoff >> (PAGE_SHIFT - 12));
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}
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asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long offset)
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{
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if (!(offset & ~PAGE_MASK)) {
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return ksys_mmap_pgoff(addr, len, prot, flags, fd,
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offset >> PAGE_SHIFT);
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} else {
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return -EINVAL;
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}
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}
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/* Fucking broken ABI */
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#ifdef CONFIG_64BIT
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asmlinkage long parisc_truncate64(const char __user * path,
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unsigned int high, unsigned int low)
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{
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return ksys_truncate(path, (long)high << 32 | low);
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}
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asmlinkage long parisc_ftruncate64(unsigned int fd,
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unsigned int high, unsigned int low)
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{
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return ksys_ftruncate(fd, (long)high << 32 | low);
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}
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/* stubs for the benefit of the syscall_table since truncate64 and truncate
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* are identical on LP64 */
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asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
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{
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return ksys_truncate(path, length);
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}
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asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
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{
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return ksys_ftruncate(fd, length);
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}
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asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
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{
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return sys_fcntl(fd, cmd, arg);
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}
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#else
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asmlinkage long parisc_truncate64(const char __user * path,
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unsigned int high, unsigned int low)
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{
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return ksys_truncate(path, (loff_t)high << 32 | low);
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}
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asmlinkage long parisc_ftruncate64(unsigned int fd,
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unsigned int high, unsigned int low)
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{
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return sys_ftruncate64(fd, (loff_t)high << 32 | low);
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}
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#endif
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asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
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unsigned int high, unsigned int low)
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{
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return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
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}
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asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
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size_t count, unsigned int high, unsigned int low)
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{
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return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
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}
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asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
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size_t count)
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{
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return ksys_readahead(fd, (loff_t)high << 32 | low, count);
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}
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asmlinkage long parisc_fadvise64_64(int fd,
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unsigned int high_off, unsigned int low_off,
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unsigned int high_len, unsigned int low_len, int advice)
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{
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return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
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(loff_t)high_len << 32 | low_len, advice);
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}
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asmlinkage long parisc_sync_file_range(int fd,
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u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
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unsigned int flags)
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{
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return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
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(loff_t)hi_nbytes << 32 | lo_nbytes, flags);
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}
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asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
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u32 lenhi, u32 lenlo)
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{
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return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
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((u64)lenhi << 32) | lenlo);
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}
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long parisc_personality(unsigned long personality)
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{
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long err;
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if (personality(current->personality) == PER_LINUX32
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&& personality(personality) == PER_LINUX)
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personality = (personality & ~PER_MASK) | PER_LINUX32;
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err = sys_personality(personality);
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if (personality(err) == PER_LINUX32)
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err = (err & ~PER_MASK) | PER_LINUX;
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return err;
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}
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/*
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* Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
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* since then O_NONBLOCK is defined as 000200000.
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*
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* The following wrapper functions mask out the old
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* O_NDELAY bit from calls which use O_NONBLOCK.
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*
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* XXX: Remove those in year 2022 (or later)?
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*/
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#define O_NONBLOCK_OLD 000200004
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#define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK)
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static int FIX_O_NONBLOCK(int flags)
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{
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if ((flags & O_NONBLOCK_MASK_OUT) &&
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!test_thread_flag(TIF_NONBLOCK_WARNING)) {
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set_thread_flag(TIF_NONBLOCK_WARNING);
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pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
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" Please recompile with newer glibc.\n",
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current->comm, current->pid);
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}
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return flags & ~O_NONBLOCK_MASK_OUT;
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}
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asmlinkage long parisc_timerfd_create(int clockid, int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return sys_timerfd_create(clockid, flags);
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}
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asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
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size_t sizemask, int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return sys_signalfd4(ufd, user_mask, sizemask, flags);
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}
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#ifdef CONFIG_COMPAT
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asmlinkage long parisc_compat_signalfd4(int ufd,
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compat_sigset_t __user *user_mask,
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compat_size_t sizemask, int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
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}
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#endif
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asmlinkage long parisc_eventfd2(unsigned int count, int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return sys_eventfd2(count, flags);
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}
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asmlinkage long parisc_userfaultfd(int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return sys_userfaultfd(flags);
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}
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asmlinkage long parisc_pipe2(int __user *fildes, int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return sys_pipe2(fildes, flags);
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}
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asmlinkage long parisc_inotify_init1(int flags)
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{
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flags = FIX_O_NONBLOCK(flags);
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return sys_inotify_init1(flags);
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}
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