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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/kernel/compat.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  linux/kernel/compat.c
34  *
....@@ -5,10 +6,6 @@
56  *  on 64 bit kernels.
67  *
78  *  Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8
- *
9
- *  This program is free software; you can redistribute it and/or modify
10
- *  it under the terms of the GNU General Public License version 2 as
11
- *  published by the Free Software Foundation.
129  */
1310 
1411 #include <linux/linkage.h>
....@@ -20,7 +17,6 @@
2017 #include <linux/syscalls.h>
2118 #include <linux/unistd.h>
2219 #include <linux/security.h>
23
-#include <linux/timex.h>
2420 #include <linux/export.h>
2521 #include <linux/migrate.h>
2622 #include <linux/posix-timers.h>
....@@ -29,157 +25,6 @@
2925 #include <linux/gfp.h>
3026 
3127 #include <linux/uaccess.h>
32
-
33
-int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
34
-{
35
-	struct compat_timex tx32;
36
-
37
-	memset(txc, 0, sizeof(struct timex));
38
-	if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
39
-		return -EFAULT;
40
-
41
-	txc->modes = tx32.modes;
42
-	txc->offset = tx32.offset;
43
-	txc->freq = tx32.freq;
44
-	txc->maxerror = tx32.maxerror;
45
-	txc->esterror = tx32.esterror;
46
-	txc->status = tx32.status;
47
-	txc->constant = tx32.constant;
48
-	txc->precision = tx32.precision;
49
-	txc->tolerance = tx32.tolerance;
50
-	txc->time.tv_sec = tx32.time.tv_sec;
51
-	txc->time.tv_usec = tx32.time.tv_usec;
52
-	txc->tick = tx32.tick;
53
-	txc->ppsfreq = tx32.ppsfreq;
54
-	txc->jitter = tx32.jitter;
55
-	txc->shift = tx32.shift;
56
-	txc->stabil = tx32.stabil;
57
-	txc->jitcnt = tx32.jitcnt;
58
-	txc->calcnt = tx32.calcnt;
59
-	txc->errcnt = tx32.errcnt;
60
-	txc->stbcnt = tx32.stbcnt;
61
-
62
-	return 0;
63
-}
64
-
65
-int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc)
66
-{
67
-	struct compat_timex tx32;
68
-
69
-	memset(&tx32, 0, sizeof(struct compat_timex));
70
-	tx32.modes = txc->modes;
71
-	tx32.offset = txc->offset;
72
-	tx32.freq = txc->freq;
73
-	tx32.maxerror = txc->maxerror;
74
-	tx32.esterror = txc->esterror;
75
-	tx32.status = txc->status;
76
-	tx32.constant = txc->constant;
77
-	tx32.precision = txc->precision;
78
-	tx32.tolerance = txc->tolerance;
79
-	tx32.time.tv_sec = txc->time.tv_sec;
80
-	tx32.time.tv_usec = txc->time.tv_usec;
81
-	tx32.tick = txc->tick;
82
-	tx32.ppsfreq = txc->ppsfreq;
83
-	tx32.jitter = txc->jitter;
84
-	tx32.shift = txc->shift;
85
-	tx32.stabil = txc->stabil;
86
-	tx32.jitcnt = txc->jitcnt;
87
-	tx32.calcnt = txc->calcnt;
88
-	tx32.errcnt = txc->errcnt;
89
-	tx32.stbcnt = txc->stbcnt;
90
-	tx32.tai = txc->tai;
91
-	if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
92
-		return -EFAULT;
93
-	return 0;
94
-}
95
-
96
-static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
97
-{
98
-	return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
99
-			__get_user(tv->tv_sec, &ctv->tv_sec) ||
100
-			__get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
101
-}
102
-
103
-static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
104
-{
105
-	return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
106
-			__put_user(tv->tv_sec, &ctv->tv_sec) ||
107
-			__put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
108
-}
109
-
110
-static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
111
-{
112
-	return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
113
-			__get_user(ts->tv_sec, &cts->tv_sec) ||
114
-			__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
115
-}
116
-
117
-static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
118
-{
119
-	return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
120
-			__put_user(ts->tv_sec, &cts->tv_sec) ||
121
-			__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
122
-}
123
-
124
-int compat_get_timeval(struct timeval *tv, const void __user *utv)
125
-{
126
-	if (COMPAT_USE_64BIT_TIME)
127
-		return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
128
-	else
129
-		return __compat_get_timeval(tv, utv);
130
-}
131
-EXPORT_SYMBOL_GPL(compat_get_timeval);
132
-
133
-int compat_put_timeval(const struct timeval *tv, void __user *utv)
134
-{
135
-	if (COMPAT_USE_64BIT_TIME)
136
-		return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
137
-	else
138
-		return __compat_put_timeval(tv, utv);
139
-}
140
-EXPORT_SYMBOL_GPL(compat_put_timeval);
141
-
142
-int compat_get_timespec(struct timespec *ts, const void __user *uts)
143
-{
144
-	if (COMPAT_USE_64BIT_TIME)
145
-		return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
146
-	else
147
-		return __compat_get_timespec(ts, uts);
148
-}
149
-EXPORT_SYMBOL_GPL(compat_get_timespec);
150
-
151
-int compat_put_timespec(const struct timespec *ts, void __user *uts)
152
-{
153
-	if (COMPAT_USE_64BIT_TIME)
154
-		return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
155
-	else
156
-		return __compat_put_timespec(ts, uts);
157
-}
158
-EXPORT_SYMBOL_GPL(compat_put_timespec);
159
-
160
-int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
161
-{
162
-	struct compat_itimerval v32;
163
-
164
-	if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
165
-		return -EFAULT;
166
-	o->it_interval.tv_sec = v32.it_interval.tv_sec;
167
-	o->it_interval.tv_usec = v32.it_interval.tv_usec;
168
-	o->it_value.tv_sec = v32.it_value.tv_sec;
169
-	o->it_value.tv_usec = v32.it_value.tv_usec;
170
-	return 0;
171
-}
172
-
173
-int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i)
174
-{
175
-	struct compat_itimerval v32;
176
-
177
-	v32.it_interval.tv_sec = i->it_interval.tv_sec;
178
-	v32.it_interval.tv_usec = i->it_interval.tv_usec;
179
-	v32.it_value.tv_sec = i->it_value.tv_sec;
180
-	v32.it_value.tv_usec = i->it_value.tv_usec;
181
-	return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
182
-}
18328 
18429 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
18530 
....@@ -307,7 +152,7 @@
307152 	if (len & (sizeof(compat_ulong_t)-1))
308153 		return -EINVAL;
309154 
310
-	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
155
+	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
311156 		return -ENOMEM;
312157 
313158 	ret = sched_getaffinity(pid, mask);
....@@ -335,7 +180,7 @@
335180 		const struct compat_sigevent __user *u_event)
336181 {
337182 	memset(event, 0, sizeof(*event));
338
-	return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
183
+	return (!access_ok(u_event, sizeof(*u_event)) ||
339184 		__get_user(event->sigev_value.sival_int,
340185 			&u_event->sigev_value.sival_int) ||
341186 		__get_user(event->sigev_signo, &u_event->sigev_signo) ||
....@@ -354,7 +199,7 @@
354199 	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
355200 	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
356201 
357
-	if (!user_access_begin(VERIFY_READ, umask, bitmap_size / 8))
202
+	if (!user_read_access_begin(umask, bitmap_size / 8))
358203 		return -EFAULT;
359204 
360205 	while (nr_compat_longs > 1) {
....@@ -366,11 +211,11 @@
366211 	}
367212 	if (nr_compat_longs)
368213 		unsafe_get_user(*mask, umask++, Efault);
369
-	user_access_end();
214
+	user_read_access_end();
370215 	return 0;
371216 
372217 Efault:
373
-	user_access_end();
218
+	user_read_access_end();
374219 	return -EFAULT;
375220 }
376221 
....@@ -383,7 +228,7 @@
383228 	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
384229 	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
385230 
386
-	if (!user_access_begin(VERIFY_WRITE, umask, bitmap_size / 8))
231
+	if (!user_write_access_begin(umask, bitmap_size / 8))
387232 		return -EFAULT;
388233 
389234 	while (nr_compat_longs > 1) {
....@@ -394,10 +239,10 @@
394239 	}
395240 	if (nr_compat_longs)
396241 		unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
397
-	user_access_end();
242
+	user_write_access_end();
398243 	return 0;
399244 Efault:
400
-	user_access_end();
245
+	user_write_access_end();
401246 	return -EFAULT;
402247 }
403248 
....@@ -410,8 +255,11 @@
410255 		return -EFAULT;
411256 	switch (_NSIG_WORDS) {
412257 	case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
258
+		fallthrough;
413259 	case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
260
+		fallthrough;
414261 	case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
262
+		fallthrough;
415263 	case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
416264 	}
417265 #else
....@@ -436,7 +284,7 @@
436284 
437285 	ptr = arch_compat_alloc_user_space(len);
438286 
439
-	if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
287
+	if (unlikely(!access_ok(ptr, len)))
440288 		return NULL;
441289 
442290 	return ptr;