1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PKEYS_HELPER_H
3 #define _PKEYS_HELPER_H
4 #define _GNU_SOURCE
5 #include <string.h>
6 #include <stdarg.h>
7 #include <stdio.h>
8 #include <stdint.h>
9 #include <stdbool.h>
10 #include <signal.h>
11 #include <assert.h>
12 #include <stdlib.h>
13 #include <ucontext.h>
14 #include <sys/mman.h>
15
16 #include "../kselftest.h"
17
18 /* Define some kernel-like types */
19 #define u8 __u8
20 #define u16 __u16
21 #define u32 __u32
22 #define u64 __u64
23
24 #define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
25
26 #ifndef DEBUG_LEVEL
27 #define DEBUG_LEVEL 0
28 #endif
29 #define DPRINT_IN_SIGNAL_BUF_SIZE 4096
30 extern int dprint_in_signal;
31 extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
32
33 extern int test_nr;
34 extern int iteration_nr;
35
36 #ifdef __GNUC__
37 __attribute__((format(printf, 1, 2)))
38 #endif
sigsafe_printf(const char * format,...)39 static inline void sigsafe_printf(const char *format, ...)
40 {
41 va_list ap;
42
43 if (!dprint_in_signal) {
44 va_start(ap, format);
45 vprintf(format, ap);
46 va_end(ap);
47 } else {
48 int ret;
49 /*
50 * No printf() functions are signal-safe.
51 * They deadlock easily. Write the format
52 * string to get some output, even if
53 * incomplete.
54 */
55 ret = write(1, format, strlen(format));
56 if (ret < 0)
57 exit(1);
58 }
59 }
60 #define dprintf_level(level, args...) do { \
61 if (level <= DEBUG_LEVEL) \
62 sigsafe_printf(args); \
63 } while (0)
64 #define dprintf0(args...) dprintf_level(0, args)
65 #define dprintf1(args...) dprintf_level(1, args)
66 #define dprintf2(args...) dprintf_level(2, args)
67 #define dprintf3(args...) dprintf_level(3, args)
68 #define dprintf4(args...) dprintf_level(4, args)
69
70 extern void abort_hooks(void);
71 #define pkey_assert(condition) do { \
72 if (!(condition)) { \
73 dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
74 __FILE__, __LINE__, \
75 test_nr, iteration_nr); \
76 dprintf0("errno at assert: %d", errno); \
77 abort_hooks(); \
78 exit(__LINE__); \
79 } \
80 } while (0)
81
82 __attribute__((noinline)) int read_ptr(int *ptr);
83 void expected_pkey_fault(int pkey);
84 int sys_pkey_alloc(unsigned long flags, unsigned long init_val);
85 int sys_pkey_free(unsigned long pkey);
86 int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
87 unsigned long pkey);
88 void record_pkey_malloc(void *ptr, long size, int prot);
89
90 #if defined(__i386__) || defined(__x86_64__) /* arch */
91 #include "pkey-x86.h"
92 #elif defined(__powerpc64__) /* arch */
93 #include "pkey-powerpc.h"
94 #else /* arch */
95 #error Architecture not supported
96 #endif /* arch */
97
98 #define PKEY_MASK (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE)
99
set_pkey_bits(u64 reg,int pkey,u64 flags)100 static inline u64 set_pkey_bits(u64 reg, int pkey, u64 flags)
101 {
102 u32 shift = pkey_bit_position(pkey);
103 /* mask out bits from pkey in old value */
104 reg &= ~((u64)PKEY_MASK << shift);
105 /* OR in new bits for pkey */
106 reg |= (flags & PKEY_MASK) << shift;
107 return reg;
108 }
109
get_pkey_bits(u64 reg,int pkey)110 static inline u64 get_pkey_bits(u64 reg, int pkey)
111 {
112 u32 shift = pkey_bit_position(pkey);
113 /*
114 * shift down the relevant bits to the lowest two, then
115 * mask off all the other higher bits
116 */
117 return ((reg >> shift) & PKEY_MASK);
118 }
119
120 extern u64 shadow_pkey_reg;
121
_read_pkey_reg(int line)122 static inline u64 _read_pkey_reg(int line)
123 {
124 u64 pkey_reg = __read_pkey_reg();
125
126 dprintf4("read_pkey_reg(line=%d) pkey_reg: %016llx"
127 " shadow: %016llx\n",
128 line, pkey_reg, shadow_pkey_reg);
129 assert(pkey_reg == shadow_pkey_reg);
130
131 return pkey_reg;
132 }
133
134 #define read_pkey_reg() _read_pkey_reg(__LINE__)
135
write_pkey_reg(u64 pkey_reg)136 static inline void write_pkey_reg(u64 pkey_reg)
137 {
138 dprintf4("%s() changing %016llx to %016llx\n", __func__,
139 __read_pkey_reg(), pkey_reg);
140 /* will do the shadow check for us: */
141 read_pkey_reg();
142 __write_pkey_reg(pkey_reg);
143 shadow_pkey_reg = pkey_reg;
144 dprintf4("%s(%016llx) pkey_reg: %016llx\n", __func__,
145 pkey_reg, __read_pkey_reg());
146 }
147
148 /*
149 * These are technically racy. since something could
150 * change PKEY register between the read and the write.
151 */
__pkey_access_allow(int pkey,int do_allow)152 static inline void __pkey_access_allow(int pkey, int do_allow)
153 {
154 u64 pkey_reg = read_pkey_reg();
155 int bit = pkey * 2;
156
157 if (do_allow)
158 pkey_reg &= (1<<bit);
159 else
160 pkey_reg |= (1<<bit);
161
162 dprintf4("pkey_reg now: %016llx\n", read_pkey_reg());
163 write_pkey_reg(pkey_reg);
164 }
165
__pkey_write_allow(int pkey,int do_allow_write)166 static inline void __pkey_write_allow(int pkey, int do_allow_write)
167 {
168 u64 pkey_reg = read_pkey_reg();
169 int bit = pkey * 2 + 1;
170
171 if (do_allow_write)
172 pkey_reg &= (1<<bit);
173 else
174 pkey_reg |= (1<<bit);
175
176 write_pkey_reg(pkey_reg);
177 dprintf4("pkey_reg now: %016llx\n", read_pkey_reg());
178 }
179
180 #define ALIGN_UP(x, align_to) (((x) + ((align_to)-1)) & ~((align_to)-1))
181 #define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
182 #define ALIGN_PTR_UP(p, ptr_align_to) \
183 ((typeof(p))ALIGN_UP((unsigned long)(p), ptr_align_to))
184 #define ALIGN_PTR_DOWN(p, ptr_align_to) \
185 ((typeof(p))ALIGN_DOWN((unsigned long)(p), ptr_align_to))
186 #define __stringify_1(x...) #x
187 #define __stringify(x...) __stringify_1(x)
188
siginfo_get_pkey_ptr(siginfo_t * si)189 static inline u32 *siginfo_get_pkey_ptr(siginfo_t *si)
190 {
191 #ifdef si_pkey
192 return &si->si_pkey;
193 #else
194 return (u32 *)(((u8 *)si) + si_pkey_offset);
195 #endif
196 }
197
kernel_has_pkeys(void)198 static inline int kernel_has_pkeys(void)
199 {
200 /* try allocating a key and see if it succeeds */
201 int ret = sys_pkey_alloc(0, 0);
202 if (ret <= 0) {
203 return 0;
204 }
205 sys_pkey_free(ret);
206 return 1;
207 }
208
is_pkeys_supported(void)209 static inline int is_pkeys_supported(void)
210 {
211 /* check if the cpu supports pkeys */
212 if (!cpu_has_pkeys()) {
213 dprintf1("SKIP: %s: no CPU support\n", __func__);
214 return 0;
215 }
216
217 /* check if the kernel supports pkeys */
218 if (!kernel_has_pkeys()) {
219 dprintf1("SKIP: %s: no kernel support\n", __func__);
220 return 0;
221 }
222
223 return 1;
224 }
225
226 #endif /* _PKEYS_HELPER_H */
227