xref: /openbmc/linux/arch/parisc/kernel/sys_parisc.c (revision 2345ef96)
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 
shared_align_offset(unsigned long filp_pgoff,unsigned long pgoff)37 static unsigned long shared_align_offset(unsigned long filp_pgoff,
38 					 unsigned long pgoff)
39 {
40 	return (filp_pgoff + pgoff) << PAGE_SHIFT;
41 }
42 
COLOR_ALIGN(unsigned long addr,unsigned long filp_pgoff,unsigned long pgoff)43 static 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 
calc_max_stack_size(unsigned long stack_max)57 unsigned 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  */
mmap_upper_limit(struct rlimit * rlim_stack)80 unsigned 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 
97 enum mmap_allocation_direction {UP, DOWN};
98 
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)99 static 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 
arch_get_unmapped_area(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)169 unsigned 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 
arch_get_unmapped_area_topdown(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)176 unsigned 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 
sys_mmap2(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)184 asmlinkage 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 
sys_mmap(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long offset)194 asmlinkage 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
parisc_truncate64(const char __user * path,unsigned int high,unsigned int low)209 asmlinkage 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 
parisc_ftruncate64(unsigned int fd,unsigned int high,unsigned int low)215 asmlinkage 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 */
sys_truncate64(const char __user * path,unsigned long length)223 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
224 {
225 	return ksys_truncate(path, length);
226 }
sys_ftruncate64(unsigned int fd,unsigned long length)227 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
228 {
229 	return ksys_ftruncate(fd, length);
230 }
sys_fcntl64(unsigned int fd,unsigned int cmd,unsigned long arg)231 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
232 {
233 	return sys_fcntl(fd, cmd, arg);
234 }
235 #else
236 
parisc_truncate64(const char __user * path,unsigned int high,unsigned int low)237 asmlinkage 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 
parisc_ftruncate64(unsigned int fd,unsigned int high,unsigned int low)243 asmlinkage 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 
parisc_pread64(unsigned int fd,char __user * buf,size_t count,unsigned int high,unsigned int low)250 asmlinkage 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 
parisc_pwrite64(unsigned int fd,const char __user * buf,size_t count,unsigned int high,unsigned int low)256 asmlinkage 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 
parisc_readahead(int fd,unsigned int high,unsigned int low,size_t count)262 asmlinkage 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 
parisc_fadvise64_64(int fd,unsigned int high_off,unsigned int low_off,unsigned int high_len,unsigned int low_len,int advice)268 asmlinkage 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 
parisc_sync_file_range(int fd,u32 hi_off,u32 lo_off,u32 hi_nbytes,u32 lo_nbytes,unsigned int flags)276 asmlinkage 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 
parisc_fallocate(int fd,int mode,u32 offhi,u32 offlo,u32 lenhi,u32 lenlo)284 asmlinkage 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 
parisc_personality(unsigned long personality)291 asmlinkage 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 
FIX_O_NONBLOCK(int flags)319 static 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 
parisc_timerfd_create(int clockid,int flags)331 asmlinkage long parisc_timerfd_create(int clockid, int flags)
332 {
333 	flags = FIX_O_NONBLOCK(flags);
334 	return sys_timerfd_create(clockid, flags);
335 }
336 
parisc_signalfd4(int ufd,sigset_t __user * user_mask,size_t sizemask,int flags)337 asmlinkage 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
parisc_compat_signalfd4(int ufd,compat_sigset_t __user * user_mask,compat_size_t sizemask,int flags)345 asmlinkage 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 
parisc_eventfd2(unsigned int count,int flags)354 asmlinkage long parisc_eventfd2(unsigned int count, int flags)
355 {
356 	flags = FIX_O_NONBLOCK(flags);
357 	return sys_eventfd2(count, flags);
358 }
359 
parisc_userfaultfd(int flags)360 asmlinkage long parisc_userfaultfd(int flags)
361 {
362 	flags = FIX_O_NONBLOCK(flags);
363 	return sys_userfaultfd(flags);
364 }
365 
parisc_pipe2(int __user * fildes,int flags)366 asmlinkage long parisc_pipe2(int __user *fildes, int flags)
367 {
368 	flags = FIX_O_NONBLOCK(flags);
369 	return sys_pipe2(fildes, flags);
370 }
371 
parisc_inotify_init1(int flags)372 asmlinkage 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 
parisc_madvise(unsigned long start,size_t len_in,int behavior)389 asmlinkage 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