1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on |
4 | * sys_sparc32 |
5 | * |
6 | * Copyright (C) 2000 VA Linux Co |
7 | * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> |
8 | * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> |
9 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
10 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) |
11 | * Copyright (C) 2000 Hewlett-Packard Co. |
12 | * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> |
13 | * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port) |
14 | * |
15 | * These routines maintain argument size conversion between 32bit and 64bit |
16 | * environment. In 2.5 most of this should be moved to a generic directory. |
17 | * |
18 | * This file assumes that there is a hole at the end of user address space. |
19 | * |
20 | * Some of the functions are LE specific currently. These are |
21 | * hopefully all marked. This should be fixed. |
22 | */ |
23 | |
24 | #include <linux/kernel.h> |
25 | #include <linux/sched.h> |
26 | #include <linux/fs.h> |
27 | #include <linux/file.h> |
28 | #include <linux/signal.h> |
29 | #include <linux/syscalls.h> |
30 | #include <linux/times.h> |
31 | #include <linux/utsname.h> |
32 | #include <linux/mm.h> |
33 | #include <linux/uio.h> |
34 | #include <linux/poll.h> |
35 | #include <linux/personality.h> |
36 | #include <linux/stat.h> |
37 | #include <linux/rwsem.h> |
38 | #include <linux/compat.h> |
39 | #include <linux/vfs.h> |
40 | #include <linux/ptrace.h> |
41 | #include <linux/highuid.h> |
42 | #include <linux/sysctl.h> |
43 | #include <linux/slab.h> |
44 | #include <linux/sched/task.h> |
45 | #include <asm/mman.h> |
46 | #include <asm/types.h> |
47 | #include <linux/uaccess.h> |
48 | #include <linux/atomic.h> |
49 | #include <asm/vgtod.h> |
50 | #include <asm/ia32.h> |
51 | |
52 | #define AA(__x) ((unsigned long)(__x)) |
53 | |
54 | SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename, |
55 | unsigned long, offset_low, unsigned long, offset_high) |
56 | { |
57 | return ksys_truncate(pathname: filename, |
58 | length: ((loff_t) offset_high << 32) | offset_low); |
59 | } |
60 | |
61 | SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd, |
62 | unsigned long, offset_low, unsigned long, offset_high) |
63 | { |
64 | return ksys_ftruncate(fd, length: ((loff_t) offset_high << 32) | offset_low); |
65 | } |
66 | |
67 | /* warning: next two assume little endian */ |
68 | SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf, |
69 | u32, count, u32, poslo, u32, poshi) |
70 | { |
71 | return ksys_pread64(fd, buf: ubuf, count, |
72 | pos: ((loff_t)AA(poshi) << 32) | AA(poslo)); |
73 | } |
74 | |
75 | SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf, |
76 | u32, count, u32, poslo, u32, poshi) |
77 | { |
78 | return ksys_pwrite64(fd, buf: ubuf, count, |
79 | pos: ((loff_t)AA(poshi) << 32) | AA(poslo)); |
80 | } |
81 | |
82 | |
83 | /* |
84 | * Some system calls that need sign extended arguments. This could be |
85 | * done by a generic wrapper. |
86 | */ |
87 | SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low, |
88 | __u32, offset_high, __u32, len_low, __u32, len_high, |
89 | int, advice) |
90 | { |
91 | return ksys_fadvise64_64(fd, |
92 | offset: (((u64)offset_high)<<32) | offset_low, |
93 | len: (((u64)len_high)<<32) | len_low, |
94 | advice); |
95 | } |
96 | |
97 | SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo, |
98 | unsigned int, off_hi, size_t, count) |
99 | { |
100 | return ksys_readahead(fd, offset: ((u64)off_hi << 32) | off_lo, count); |
101 | } |
102 | |
103 | SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low, |
104 | unsigned int, off_hi, unsigned int, n_low, |
105 | unsigned int, n_hi, int, flags) |
106 | { |
107 | return ksys_sync_file_range(fd, |
108 | offset: ((u64)off_hi << 32) | off_low, |
109 | nbytes: ((u64)n_hi << 32) | n_low, flags); |
110 | } |
111 | |
112 | SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo, |
113 | unsigned int, offset_hi, size_t, len, int, advice) |
114 | { |
115 | return ksys_fadvise64_64(fd, offset: ((u64)offset_hi << 32) | offset_lo, |
116 | len, advice); |
117 | } |
118 | |
119 | SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode, |
120 | unsigned int, offset_lo, unsigned int, offset_hi, |
121 | unsigned int, len_lo, unsigned int, len_hi) |
122 | { |
123 | return ksys_fallocate(fd, mode, offset: ((u64)offset_hi << 32) | offset_lo, |
124 | len: ((u64)len_hi << 32) | len_lo); |
125 | } |
126 | |
127 | #ifdef CONFIG_IA32_EMULATION |
128 | /* |
129 | * Another set for IA32/LFS -- x86_64 struct stat is different due to |
130 | * support for 64bit inode numbers. |
131 | */ |
132 | static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat) |
133 | { |
134 | typeof(ubuf->st_uid) uid = 0; |
135 | typeof(ubuf->st_gid) gid = 0; |
136 | SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid)); |
137 | SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid)); |
138 | if (!user_write_access_begin(ubuf, sizeof(struct stat64))) |
139 | return -EFAULT; |
140 | unsafe_put_user(huge_encode_dev(stat->dev), &ubuf->st_dev, Efault); |
141 | unsafe_put_user(stat->ino, &ubuf->__st_ino, Efault); |
142 | unsafe_put_user(stat->ino, &ubuf->st_ino, Efault); |
143 | unsafe_put_user(stat->mode, &ubuf->st_mode, Efault); |
144 | unsafe_put_user(stat->nlink, &ubuf->st_nlink, Efault); |
145 | unsafe_put_user(uid, &ubuf->st_uid, Efault); |
146 | unsafe_put_user(gid, &ubuf->st_gid, Efault); |
147 | unsafe_put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev, Efault); |
148 | unsafe_put_user(stat->size, &ubuf->st_size, Efault); |
149 | unsafe_put_user(stat->atime.tv_sec, &ubuf->st_atime, Efault); |
150 | unsafe_put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec, Efault); |
151 | unsafe_put_user(stat->mtime.tv_sec, &ubuf->st_mtime, Efault); |
152 | unsafe_put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec, Efault); |
153 | unsafe_put_user(stat->ctime.tv_sec, &ubuf->st_ctime, Efault); |
154 | unsafe_put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec, Efault); |
155 | unsafe_put_user(stat->blksize, &ubuf->st_blksize, Efault); |
156 | unsafe_put_user(stat->blocks, &ubuf->st_blocks, Efault); |
157 | user_access_end(); |
158 | return 0; |
159 | Efault: |
160 | user_write_access_end(); |
161 | return -EFAULT; |
162 | } |
163 | |
164 | COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename, |
165 | struct stat64 __user *, statbuf) |
166 | { |
167 | struct kstat stat; |
168 | int ret = vfs_stat(filename, stat: &stat); |
169 | |
170 | if (!ret) |
171 | ret = cp_stat64(ubuf: statbuf, stat: &stat); |
172 | return ret; |
173 | } |
174 | |
175 | COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename, |
176 | struct stat64 __user *, statbuf) |
177 | { |
178 | struct kstat stat; |
179 | int ret = vfs_lstat(name: filename, stat: &stat); |
180 | if (!ret) |
181 | ret = cp_stat64(ubuf: statbuf, stat: &stat); |
182 | return ret; |
183 | } |
184 | |
185 | COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd, |
186 | struct stat64 __user *, statbuf) |
187 | { |
188 | struct kstat stat; |
189 | int ret = vfs_fstat(fd, stat: &stat); |
190 | if (!ret) |
191 | ret = cp_stat64(ubuf: statbuf, stat: &stat); |
192 | return ret; |
193 | } |
194 | |
195 | COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd, |
196 | const char __user *, filename, |
197 | struct stat64 __user *, statbuf, int, flag) |
198 | { |
199 | struct kstat stat; |
200 | int error; |
201 | |
202 | error = vfs_fstatat(dfd, filename, stat: &stat, flags: flag); |
203 | if (error) |
204 | return error; |
205 | return cp_stat64(ubuf: statbuf, stat: &stat); |
206 | } |
207 | |
208 | /* |
209 | * Linux/i386 didn't use to be able to handle more than |
210 | * 4 system call parameters, so these system calls used a memory |
211 | * block for parameter passing.. |
212 | */ |
213 | |
214 | struct mmap_arg_struct32 { |
215 | unsigned int addr; |
216 | unsigned int len; |
217 | unsigned int prot; |
218 | unsigned int flags; |
219 | unsigned int fd; |
220 | unsigned int offset; |
221 | }; |
222 | |
223 | COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg) |
224 | { |
225 | struct mmap_arg_struct32 a; |
226 | |
227 | if (copy_from_user(to: &a, from: arg, n: sizeof(a))) |
228 | return -EFAULT; |
229 | |
230 | if (a.offset & ~PAGE_MASK) |
231 | return -EINVAL; |
232 | |
233 | return ksys_mmap_pgoff(addr: a.addr, len: a.len, prot: a.prot, flags: a.flags, fd: a.fd, |
234 | pgoff: a.offset>>PAGE_SHIFT); |
235 | } |
236 | |
237 | /* |
238 | * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS |
239 | */ |
240 | COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags, |
241 | unsigned long, newsp, int __user *, parent_tidptr, |
242 | unsigned long, tls_val, int __user *, child_tidptr) |
243 | { |
244 | struct kernel_clone_args args = { |
245 | .flags = (clone_flags & ~CSIGNAL), |
246 | .pidfd = parent_tidptr, |
247 | .child_tid = child_tidptr, |
248 | .parent_tid = parent_tidptr, |
249 | .exit_signal = (clone_flags & CSIGNAL), |
250 | .stack = newsp, |
251 | .tls = tls_val, |
252 | }; |
253 | |
254 | return kernel_clone(kargs: &args); |
255 | } |
256 | #endif /* CONFIG_IA32_EMULATION */ |
257 | |