| // 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 <deller@gmx.de> |
| */ |
| |
| #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> |
| |
| /* we construct an artificial offset for the mapping based on the physical |
| * address of the kernel mapping variable */ |
| #define GET_LAST_MMAP(filp) \ |
| (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) |
| #define SET_LAST_MMAP(filp, val) \ |
| { /* nothing */ } |
| |
| static int get_offset(unsigned int last_mmap) |
| { |
| return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; |
| } |
| |
| static unsigned long shared_align_offset(unsigned int last_mmap, |
| unsigned long pgoff) |
| { |
| return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; |
| } |
| |
| static inline unsigned long COLOR_ALIGN(unsigned long addr, |
| unsigned int last_mmap, unsigned long pgoff) |
| { |
| unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); |
| unsigned long off = (SHM_COLOUR-1) & |
| (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); |
| |
| 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(). |
| */ |
| static 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); |
| } |
| |
| |
| unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, |
| unsigned long len, unsigned long pgoff, unsigned long flags) |
| { |
| struct mm_struct *mm = current->mm; |
| struct vm_area_struct *vma, *prev; |
| unsigned long task_size = TASK_SIZE; |
| int do_color_align, last_mmap; |
| struct vm_unmapped_area_info info; |
| |
| if (len > task_size) |
| return -ENOMEM; |
| |
| do_color_align = 0; |
| if (filp || (flags & MAP_SHARED)) |
| do_color_align = 1; |
| last_mmap = GET_LAST_MMAP(filp); |
| |
| if (flags & MAP_FIXED) { |
| if ((flags & MAP_SHARED) && last_mmap && |
| (addr - shared_align_offset(last_mmap, pgoff)) |
| & (SHM_COLOUR - 1)) |
| return -EINVAL; |
| goto found_addr; |
| } |
| |
| if (addr) { |
| if (do_color_align && last_mmap) |
| addr = COLOR_ALIGN(addr, last_mmap, 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))) |
| goto found_addr; |
| } |
| |
| info.flags = 0; |
| info.length = len; |
| info.low_limit = mm->mmap_legacy_base; |
| info.high_limit = mmap_upper_limit(NULL); |
| info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
| info.align_offset = shared_align_offset(last_mmap, pgoff); |
| addr = vm_unmapped_area(&info); |
| |
| found_addr: |
| if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) |
| SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); |
| |
| return addr; |
| } |
| |
| unsigned long |
| arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, |
| const unsigned long len, const unsigned long pgoff, |
| const unsigned long flags) |
| { |
| struct vm_area_struct *vma, *prev; |
| struct mm_struct *mm = current->mm; |
| unsigned long addr = addr0; |
| int do_color_align, last_mmap; |
| struct vm_unmapped_area_info info; |
| |
| /* requested length too big for entire address space */ |
| if (len > TASK_SIZE) |
| return -ENOMEM; |
| |
| do_color_align = 0; |
| if (filp || (flags & MAP_SHARED)) |
| do_color_align = 1; |
| last_mmap = GET_LAST_MMAP(filp); |
| |
| if (flags & MAP_FIXED) { |
| if ((flags & MAP_SHARED) && last_mmap && |
| (addr - shared_align_offset(last_mmap, pgoff)) |
| & (SHM_COLOUR - 1)) |
| return -EINVAL; |
| goto found_addr; |
| } |
| |
| /* requesting a specific address */ |
| if (addr) { |
| if (do_color_align && last_mmap) |
| addr = COLOR_ALIGN(addr, last_mmap, 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))) |
| goto found_addr; |
| } |
| |
| info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
| info.length = len; |
| info.low_limit = PAGE_SIZE; |
| info.high_limit = mm->mmap_base; |
| info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
| info.align_offset = shared_align_offset(last_mmap, pgoff); |
| addr = vm_unmapped_area(&info); |
| if (!(addr & ~PAGE_MASK)) |
| goto found_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. |
| */ |
| return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); |
| |
| found_addr: |
| if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) |
| SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); |
| |
| return addr; |
| } |
| |
| static int mmap_is_legacy(void) |
| { |
| if (current->personality & ADDR_COMPAT_LAYOUT) |
| return 1; |
| |
| /* parisc stack always grows up - so a unlimited stack should |
| * not be an indicator to use the legacy memory layout. |
| * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) |
| * return 1; |
| */ |
| |
| return sysctl_legacy_va_layout; |
| } |
| |
| static unsigned long mmap_rnd(void) |
| { |
| unsigned long rnd = 0; |
| |
| if (current->flags & PF_RANDOMIZE) |
| rnd = get_random_int() & MMAP_RND_MASK; |
| |
| return rnd << PAGE_SHIFT; |
| } |
| |
| unsigned long arch_mmap_rnd(void) |
| { |
| return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; |
| } |
| |
| static unsigned long mmap_legacy_base(void) |
| { |
| return TASK_UNMAPPED_BASE + mmap_rnd(); |
| } |
| |
| /* |
| * This function, called very early during the creation of a new |
| * process VM image, sets up which VM layout function to use: |
| */ |
| void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) |
| { |
| mm->mmap_legacy_base = mmap_legacy_base(); |
| mm->mmap_base = mmap_upper_limit(rlim_stack); |
| |
| if (mmap_is_legacy()) { |
| mm->mmap_base = mm->mmap_legacy_base; |
| mm->get_unmapped_area = arch_get_unmapped_area; |
| } else { |
| mm->get_unmapped_area = arch_get_unmapped_area_topdown; |
| } |
| } |
| |
| |
| 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); |
| } |
| |
| 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) { |
| struct task_struct *tsk = current; |
| pr_warn_once("%s(%d) uses a deprecated O_NONBLOCK value.\n", |
| tsk->comm, tsk->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; |
| } |
| |
| return sys_madvise(start, len_in, behavior); |
| } |