1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 *    PARISC specific syscalls
5 *
6 *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
7 *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
8 *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
9 *    Copyright (C) 1999-2020 Helge Deller <deller@gmx.de>
10 */
11
12#include <linux/uaccess.h>
13#include <asm/elf.h>
14#include <linux/file.h>
15#include <linux/fs.h>
16#include <linux/linkage.h>
17#include <linux/mm.h>
18#include <linux/mman.h>
19#include <linux/sched/signal.h>
20#include <linux/sched/mm.h>
21#include <linux/shm.h>
22#include <linux/syscalls.h>
23#include <linux/utsname.h>
24#include <linux/personality.h>
25#include <linux/random.h>
26#include <linux/compat.h>
27#include <linux/elf-randomize.h>
28
29/*
30 * Construct an artificial page offset for the mapping based on the physical
31 * address of the kernel file mapping variable.
32 */
33#define GET_FILP_PGOFF(filp)		\
34	(filp ? (((unsigned long) filp->f_mapping) >> 8)	\
35		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
36
37static unsigned long shared_align_offset(unsigned long filp_pgoff,
38					 unsigned long pgoff)
39{
40	return (filp_pgoff + pgoff) << PAGE_SHIFT;
41}
42
43static inline unsigned long COLOR_ALIGN(unsigned long addr,
44			 unsigned long filp_pgoff, unsigned long pgoff)
45{
46	unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
47	unsigned long off  = (SHM_COLOUR-1) &
48		shared_align_offset(filp_pgoff, pgoff);
49	return base + off;
50}
51
52
53#define STACK_SIZE_DEFAULT (USER_WIDE_MODE			\
54			? (1 << 30)	/* 1 GB */		\
55			: (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))
56
57unsigned long calc_max_stack_size(unsigned long stack_max)
58{
59#ifdef CONFIG_COMPAT
60	if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))
61		stack_max = STACK_SIZE_DEFAULT;
62	else
63#endif
64	if (stack_max == RLIM_INFINITY)
65		stack_max = STACK_SIZE_DEFAULT;
66
67	return stack_max;
68}
69
70
71/*
72 * Top of mmap area (just below the process stack).
73 */
74
75/*
76 * When called from arch_get_unmapped_area(), rlim_stack will be NULL,
77 * indicating that "current" should be used instead of a passed-in
78 * value from the exec bprm as done with arch_pick_mmap_layout().
79 */
80unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
81{
82	unsigned long stack_base;
83
84	/* Limit stack size - see setup_arg_pages() in fs/exec.c */
85	stack_base = rlim_stack ? rlim_stack->rlim_max
86				: rlimit_max(RLIMIT_STACK);
87
88	stack_base = calc_max_stack_size(stack_base);
89
90	/* Add space for stack randomization. */
91	if (current->flags & PF_RANDOMIZE)
92		stack_base += (STACK_RND_MASK << PAGE_SHIFT);
93
94	return PAGE_ALIGN(STACK_TOP - stack_base);
95}
96
97enum mmap_allocation_direction {UP, DOWN};
98
99static unsigned long arch_get_unmapped_area_common(struct file *filp,
100	unsigned long addr, unsigned long len, unsigned long pgoff,
101	unsigned long flags, enum mmap_allocation_direction dir)
102{
103	struct mm_struct *mm = current->mm;
104	struct vm_area_struct *vma, *prev;
105	unsigned long filp_pgoff;
106	int do_color_align;
107	struct vm_unmapped_area_info info;
108
109	if (unlikely(len > TASK_SIZE))
110		return -ENOMEM;
111
112	do_color_align = 0;
113	if (filp || (flags & MAP_SHARED))
114		do_color_align = 1;
115	filp_pgoff = GET_FILP_PGOFF(filp);
116
117	if (flags & MAP_FIXED) {
118		/* Even MAP_FIXED mappings must reside within TASK_SIZE */
119		if (TASK_SIZE - len < addr)
120			return -EINVAL;
121
122		if ((flags & MAP_SHARED) && filp &&
123		    (addr - shared_align_offset(filp_pgoff, pgoff))
124				& (SHM_COLOUR - 1))
125			return -EINVAL;
126		return addr;
127	}
128
129	if (addr) {
130		if (do_color_align)
131			addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
132		else
133			addr = PAGE_ALIGN(addr);
134
135		vma = find_vma_prev(mm, addr, &prev);
136		if (TASK_SIZE - len >= addr &&
137		    (!vma || addr + len <= vm_start_gap(vma)) &&
138		    (!prev || addr >= vm_end_gap(prev)))
139			return addr;
140	}
141
142	info.length = len;
143	info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
144	info.align_offset = shared_align_offset(filp_pgoff, pgoff);
145
146	if (dir == DOWN) {
147		info.flags = VM_UNMAPPED_AREA_TOPDOWN;
148		info.low_limit = PAGE_SIZE;
149		info.high_limit = mm->mmap_base;
150		addr = vm_unmapped_area(&info);
151		if (!(addr & ~PAGE_MASK))
152			return addr;
153		VM_BUG_ON(addr != -ENOMEM);
154
155		/*
156		 * A failed mmap() very likely causes application failure,
157		 * so fall back to the bottom-up function here. This scenario
158		 * can happen with large stack limits and large mmap()
159		 * allocations.
160		 */
161	}
162
163	info.flags = 0;
164	info.low_limit = mm->mmap_base;
165	info.high_limit = mmap_upper_limit(NULL);
166	return vm_unmapped_area(&info);
167}
168
169unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
170	unsigned long len, unsigned long pgoff, unsigned long flags)
171{
172	return arch_get_unmapped_area_common(filp,
173			addr, len, pgoff, flags, UP);
174}
175
176unsigned long arch_get_unmapped_area_topdown(struct file *filp,
177	unsigned long addr, unsigned long len, unsigned long pgoff,
178	unsigned long flags)
179{
180	return arch_get_unmapped_area_common(filp,
181			addr, len, pgoff, flags, DOWN);
182}
183
184asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
185	unsigned long prot, unsigned long flags, unsigned long fd,
186	unsigned long pgoff)
187{
188	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
189	   we have. */
190	return ksys_mmap_pgoff(addr, len, prot, flags, fd,
191			       pgoff >> (PAGE_SHIFT - 12));
192}
193
194asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
195		unsigned long prot, unsigned long flags, unsigned long fd,
196		unsigned long offset)
197{
198	if (!(offset & ~PAGE_MASK)) {
199		return ksys_mmap_pgoff(addr, len, prot, flags, fd,
200					offset >> PAGE_SHIFT);
201	} else {
202		return -EINVAL;
203	}
204}
205
206/* Fucking broken ABI */
207
208#ifdef CONFIG_64BIT
209asmlinkage long parisc_truncate64(const char __user * path,
210					unsigned int high, unsigned int low)
211{
212	return ksys_truncate(path, (long)high << 32 | low);
213}
214
215asmlinkage long parisc_ftruncate64(unsigned int fd,
216					unsigned int high, unsigned int low)
217{
218	return ksys_ftruncate(fd, (long)high << 32 | low);
219}
220
221/* stubs for the benefit of the syscall_table since truncate64 and truncate
222 * are identical on LP64 */
223asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
224{
225	return ksys_truncate(path, length);
226}
227asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
228{
229	return ksys_ftruncate(fd, length);
230}
231asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
232{
233	return sys_fcntl(fd, cmd, arg);
234}
235#else
236
237asmlinkage long parisc_truncate64(const char __user * path,
238					unsigned int high, unsigned int low)
239{
240	return ksys_truncate(path, (loff_t)high << 32 | low);
241}
242
243asmlinkage long parisc_ftruncate64(unsigned int fd,
244					unsigned int high, unsigned int low)
245{
246	return sys_ftruncate64(fd, (loff_t)high << 32 | low);
247}
248#endif
249
250asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
251					unsigned int high, unsigned int low)
252{
253	return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
254}
255
256asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
257			size_t count, unsigned int high, unsigned int low)
258{
259	return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
260}
261
262asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
263		                    size_t count)
264{
265	return ksys_readahead(fd, (loff_t)high << 32 | low, count);
266}
267
268asmlinkage long parisc_fadvise64_64(int fd,
269			unsigned int high_off, unsigned int low_off,
270			unsigned int high_len, unsigned int low_len, int advice)
271{
272	return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
273			(loff_t)high_len << 32 | low_len, advice);
274}
275
276asmlinkage long parisc_sync_file_range(int fd,
277			u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
278			unsigned int flags)
279{
280	return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
281			(loff_t)hi_nbytes << 32 | lo_nbytes, flags);
282}
283
284asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
285				u32 lenhi, u32 lenlo)
286{
287	return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
288			      ((u64)lenhi << 32) | lenlo);
289}
290
291asmlinkage long parisc_personality(unsigned long personality)
292{
293	long err;
294
295	if (personality(current->personality) == PER_LINUX32
296	    && personality(personality) == PER_LINUX)
297		personality = (personality & ~PER_MASK) | PER_LINUX32;
298
299	err = sys_personality(personality);
300	if (personality(err) == PER_LINUX32)
301		err = (err & ~PER_MASK) | PER_LINUX;
302
303	return err;
304}
305
306/*
307 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
308 * since then O_NONBLOCK is defined as 000200000.
309 *
310 * The following wrapper functions mask out the old
311 * O_NDELAY bit from calls which use O_NONBLOCK.
312 *
313 * XXX: Remove those in year 2022 (or later)?
314 */
315
316#define O_NONBLOCK_OLD		000200004
317#define O_NONBLOCK_MASK_OUT	(O_NONBLOCK_OLD & ~O_NONBLOCK)
318
319static int FIX_O_NONBLOCK(int flags)
320{
321	if ((flags & O_NONBLOCK_MASK_OUT) &&
322			!test_thread_flag(TIF_NONBLOCK_WARNING)) {
323		set_thread_flag(TIF_NONBLOCK_WARNING);
324		pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
325			" Please recompile with newer glibc.\n",
326			current->comm, current->pid);
327	}
328	return flags & ~O_NONBLOCK_MASK_OUT;
329}
330
331asmlinkage long parisc_timerfd_create(int clockid, int flags)
332{
333	flags = FIX_O_NONBLOCK(flags);
334	return sys_timerfd_create(clockid, flags);
335}
336
337asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
338	size_t sizemask, int flags)
339{
340	flags = FIX_O_NONBLOCK(flags);
341	return sys_signalfd4(ufd, user_mask, sizemask, flags);
342}
343
344#ifdef CONFIG_COMPAT
345asmlinkage long parisc_compat_signalfd4(int ufd,
346	compat_sigset_t __user *user_mask,
347	compat_size_t sizemask, int flags)
348{
349	flags = FIX_O_NONBLOCK(flags);
350	return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
351}
352#endif
353
354asmlinkage long parisc_eventfd2(unsigned int count, int flags)
355{
356	flags = FIX_O_NONBLOCK(flags);
357	return sys_eventfd2(count, flags);
358}
359
360asmlinkage long parisc_userfaultfd(int flags)
361{
362	flags = FIX_O_NONBLOCK(flags);
363	return sys_userfaultfd(flags);
364}
365
366asmlinkage long parisc_pipe2(int __user *fildes, int flags)
367{
368	flags = FIX_O_NONBLOCK(flags);
369	return sys_pipe2(fildes, flags);
370}
371
372asmlinkage long parisc_inotify_init1(int flags)
373{
374	flags = FIX_O_NONBLOCK(flags);
375	return sys_inotify_init1(flags);
376}
377
378/*
379 * madvise() wrapper
380 *
381 * Up to kernel v6.1 parisc has different values than all other
382 * platforms for the MADV_xxx flags listed below.
383 * To keep binary compatibility with existing userspace programs
384 * translate the former values to the new values.
385 *
386 * XXX: Remove this wrapper in year 2025 (or later)
387 */
388
389asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
390{
391	switch (behavior) {
392	case 65: behavior = MADV_MERGEABLE;	break;
393	case 66: behavior = MADV_UNMERGEABLE;	break;
394	case 67: behavior = MADV_HUGEPAGE;	break;
395	case 68: behavior = MADV_NOHUGEPAGE;	break;
396	case 69: behavior = MADV_DONTDUMP;	break;
397	case 70: behavior = MADV_DODUMP;	break;
398	case 71: behavior = MADV_WIPEONFORK;	break;
399	case 72: behavior = MADV_KEEPONFORK;	break;
400	case 73: behavior = MADV_COLLAPSE;	break;
401	}
402
403	return sys_madvise(start, len_in, behavior);
404}
405