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-rw-r--r--arch/parisc/kernel/sys_parisc.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
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+++ b/arch/parisc/kernel/sys_parisc.c
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+// 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>
+#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;
+
+ 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.length = len;
+ 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.flags = 0;
+ 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);
+}