// 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); }