// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PARISC specific syscalls
*
* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
* Copyright (C) 1999-2020 Helge Deller <[email protected]>
*/
#include <linux/uaccess.h>
#include <asm/elf.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
#include <linux/shm.h>
#include <linux/syscalls.h>
#include <linux/utsname.h>
#include <linux/personality.h>
#include <linux/random.h>
#include <linux/compat.h>
#include <linux/elf-randomize.h>
/*
* Construct an artificial page offset for the mapping based on the physical
* address of the kernel file mapping variable.
*/
#define GET_FILP_PGOFF(filp) \
(filp ? (((unsigned long) filp->f_mapping) >> 8) \
& ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
static unsigned long shared_align_offset(unsigned long filp_pgoff,
unsigned long pgoff)
{
return (filp_pgoff + pgoff) << PAGE_SHIFT;
}
static inline unsigned long COLOR_ALIGN(unsigned long addr,
unsigned long filp_pgoff, unsigned long pgoff)
{
unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
unsigned long off = (SHM_COLOUR-1) &
shared_align_offset(filp_pgoff, pgoff);
return base + off;
}
#define STACK_SIZE_DEFAULT (USER_WIDE_MODE \
? (1 << 30) /* 1 GB */ \
: (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))
unsigned long calc_max_stack_size(unsigned long stack_max)
{
#ifdef CONFIG_COMPAT
if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))
stack_max = STACK_SIZE_DEFAULT;
else
#endif
if (stack_max == RLIM_INFINITY)
stack_max = STACK_SIZE_DEFAULT;
return stack_max;
}
/*
* Top of mmap area (just below the process stack).
*/
/*
* When called from arch_get_unmapped_area(), rlim_stack will be NULL,
* indicating that "current" should be used instead of a passed-in
* value from the exec bprm as done with arch_pick_mmap_layout().
*/
unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
{
unsigned long stack_base;
/* Limit stack size - see setup_arg_pages() in fs/exec.c */
stack_base = rlim_stack ? rlim_stack->rlim_max
: rlimit_max(RLIMIT_STACK);
stack_base = calc_max_stack_size(stack_base);
/* Add space for stack randomization. */
if (current->flags & PF_RANDOMIZE)
stack_base += (STACK_RND_MASK << PAGE_SHIFT);
return PAGE_ALIGN(STACK_TOP - stack_base);
}
enum mmap_allocation_direction {UP, DOWN};
static unsigned long arch_get_unmapped_area_common(struct file *filp,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags, enum mmap_allocation_direction dir)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev;
unsigned long filp_pgoff;
int do_color_align;
struct vm_unmapped_area_info info = {
.length = len
};
if (unlikely(len > TASK_SIZE))
return -ENOMEM;
do_color_align = 0;
if (filp || (flags & MAP_SHARED))
do_color_align = 1;
filp_pgoff = GET_FILP_PGOFF(filp);
if (flags & MAP_FIXED) {
/* Even MAP_FIXED mappings must reside within TASK_SIZE */
if (TASK_SIZE - len < addr)
return -EINVAL;
if ((flags & MAP_SHARED) && filp &&
(addr - shared_align_offset(filp_pgoff, pgoff))
& (SHM_COLOUR - 1))
return -EINVAL;
return addr;
}
if (addr) {
if (do_color_align)
addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
else
addr = PAGE_ALIGN(addr);
vma = find_vma_prev(mm, addr, &prev);
if (TASK_SIZE - len >= addr &&
(!vma || addr + len <= vm_start_gap(vma)) &&
(!prev || addr >= vm_end_gap(prev)))
return addr;
}
info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
info.align_offset = shared_align_offset(filp_pgoff, pgoff);
if (dir == DOWN) {
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
info.low_limit = PAGE_SIZE;
info.high_limit = mm->mmap_base;
addr = vm_unmapped_area(&info);
if (!(addr & ~PAGE_MASK))
return addr;
VM_BUG_ON(addr != -ENOMEM);
/*
* A failed mmap() very likely causes application failure,
* so fall back to the bottom-up function here. This scenario
* can happen with large stack limits and large mmap()
* allocations.
*/
}
info.low_limit = mm->mmap_base;
info.high_limit = mmap_upper_limit(NULL);
return vm_unmapped_area(&info);
}
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags)
{
return arch_get_unmapped_area_common(filp,
addr, len, pgoff, flags, UP);
}
unsigned long arch_get_unmapped_area_topdown(struct file *filp,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags)
{
return arch_get_unmapped_area_common(filp,
addr, len, pgoff, flags, DOWN);
}
asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags, unsigned long fd,
unsigned long pgoff)
{
/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
we have. */
return ksys_mmap_pgoff(addr, len, prot, flags, fd,
pgoff >> (PAGE_SHIFT - 12));
}
asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags, unsigned long fd,
unsigned long offset)
{
if (!(offset & ~PAGE_MASK)) {
return ksys_mmap_pgoff(addr, len, prot, flags, fd,
offset >> PAGE_SHIFT);
} else {
return -EINVAL;
}
}
/* Fucking broken ABI */
#ifdef CONFIG_64BIT
asmlinkage long parisc_truncate64(const char __user * path,
unsigned int high, unsigned int low)
{
return ksys_truncate(path, (long)high << 32 | low);
}
asmlinkage long parisc_ftruncate64(unsigned int fd,
unsigned int high, unsigned int low)
{
return ksys_ftruncate(fd, (long)high << 32 | low);
}
/* stubs for the benefit of the syscall_table since truncate64 and truncate
* are identical on LP64 */
asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
{
return ksys_truncate(path, length);
}
asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
{
return ksys_ftruncate(fd, length);
}
asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
{
return sys_fcntl(fd, cmd, arg);
}
#else
asmlinkage long parisc_truncate64(const char __user * path,
unsigned int high, unsigned int low)
{
return ksys_truncate(path, (loff_t)high << 32 | low);
}
asmlinkage long parisc_ftruncate64(unsigned int fd,
unsigned int high, unsigned int low)
{
return sys_ftruncate64(fd, (loff_t)high << 32 | low);
}
#endif
asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
unsigned int high, unsigned int low)
{
return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
}
asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
size_t count, unsigned int high, unsigned int low)
{
return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
}
asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
size_t count)
{
return ksys_readahead(fd, (loff_t)high << 32 | low, count);
}
asmlinkage long parisc_fadvise64_64(int fd,
unsigned int high_off, unsigned int low_off,
unsigned int high_len, unsigned int low_len, int advice)
{
return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
(loff_t)high_len << 32 | low_len, advice);
}
asmlinkage long parisc_sync_file_range(int fd,
u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
unsigned int flags)
{
return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
(loff_t)hi_nbytes << 32 | lo_nbytes, flags);
}
asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
u32 lenhi, u32 lenlo)
{
return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
((u64)lenhi << 32) | lenlo);
}
asmlinkage long parisc_personality(unsigned long personality)
{
long err;
if (personality(current->personality) == PER_LINUX32
&& personality(personality) == PER_LINUX)
personality = (personality & ~PER_MASK) | PER_LINUX32;
err = sys_personality(personality);
if (personality(err) == PER_LINUX32)
err = (err & ~PER_MASK) | PER_LINUX;
return err;
}
/*
* Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
* since then O_NONBLOCK is defined as 000200000.
*
* The following wrapper functions mask out the old
* O_NDELAY bit from calls which use O_NONBLOCK.
*
* XXX: Remove those in year 2022 (or later)?
*/
#define O_NONBLOCK_OLD 000200004
#define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK)
static int FIX_O_NONBLOCK(int flags)
{
if ((flags & O_NONBLOCK_MASK_OUT) &&
!test_thread_flag(TIF_NONBLOCK_WARNING)) {
set_thread_flag(TIF_NONBLOCK_WARNING);
pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
" Please recompile with newer glibc.\n",
current->comm, current->pid);
}
return flags & ~O_NONBLOCK_MASK_OUT;
}
asmlinkage long parisc_timerfd_create(int clockid, int flags)
{
flags = FIX_O_NONBLOCK(flags);
return sys_timerfd_create(clockid, flags);
}
asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
size_t sizemask, int flags)
{
flags = FIX_O_NONBLOCK(flags);
return sys_signalfd4(ufd, user_mask, sizemask, flags);
}
#ifdef CONFIG_COMPAT
asmlinkage long parisc_compat_signalfd4(int ufd,
compat_sigset_t __user *user_mask,
compat_size_t sizemask, int flags)
{
flags = FIX_O_NONBLOCK(flags);
return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
}
#endif
asmlinkage long parisc_eventfd2(unsigned int count, int flags)
{
flags = FIX_O_NONBLOCK(flags);
return sys_eventfd2(count, flags);
}
asmlinkage long parisc_userfaultfd(int flags)
{
flags = FIX_O_NONBLOCK(flags);
return sys_userfaultfd(flags);
}
asmlinkage long parisc_pipe2(int __user *fildes, int flags)
{
flags = FIX_O_NONBLOCK(flags);
return sys_pipe2(fildes, flags);
}
asmlinkage long parisc_inotify_init1(int flags)
{
flags = FIX_O_NONBLOCK(flags);
return sys_inotify_init1(flags);
}
/*
* madvise() wrapper
*
* Up to kernel v6.1 parisc has different values than all other
* platforms for the MADV_xxx flags listed below.
* To keep binary compatibility with existing userspace programs
* translate the former values to the new values.
*
* XXX: Remove this wrapper in year 2025 (or later)
*/
asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
{
switch (behavior) {
case 65: behavior = MADV_MERGEABLE; break;
case 66: behavior = MADV_UNMERGEABLE; break;
case 67: behavior = MADV_HUGEPAGE; break;
case 68: behavior = MADV_NOHUGEPAGE; break;
case 69: behavior = MADV_DONTDUMP; break;
case 70: behavior = MADV_DODUMP; break;
case 71: behavior = MADV_WIPEONFORK; break;
case 72: behavior = MADV_KEEPONFORK; break;
case 73: behavior = MADV_COLLAPSE; break;
}
return sys_madvise(start, len_in, behavior);
}
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