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1 /*
2  * Copyright (c) 2017 Cyril Hrubis <chrubis@suse.cz>
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #include <linux/personality.h>
19 #include <sys/utsname.h>
20 #include "test.h"
21 #include "tst_kernel.h"
22 
get_kernel_bits_from_uname(struct utsname * buf)23 static int get_kernel_bits_from_uname(struct utsname *buf)
24 {
25 	if (uname(buf)) {
26 		tst_brkm(TBROK | TERRNO, NULL, "uname()");
27 		return -1;
28 	}
29 
30 	return strstr(buf->machine, "64") ? 64 : 32;
31 }
32 
tst_kernel_bits(void)33 int tst_kernel_bits(void)
34 {
35 	struct utsname buf;
36 	int kernel_bits = get_kernel_bits_from_uname(&buf);
37 
38 	if (kernel_bits == -1)
39 		return -1;
40 
41 	/*
42 	 * ARM64 (aarch64) defines 32-bit compatibility modes as
43 	 * armv8l and armv8b (little and big endian).
44 	 * s390x is 64bit but not contain 64 in the words.
45 	 */
46 	if (!strcmp(buf.machine, "armv8l") || !strcmp(buf.machine, "armv8b")
47 			|| !strcmp(buf.machine, "s390x"))
48 		kernel_bits = 64;
49 
50 #ifdef __ANDROID__
51 	/* Android's bionic libc sets the PER_LINUX32 personality for all 32-bit
52 	 * programs. This will cause buf.machine to report as i686 even though
53 	 * the kernel itself is 64-bit.
54 	 */
55 	if (!strcmp(buf.machine, "i686") &&
56 			(personality(0xffffffff) & PER_MASK) == PER_LINUX32) {
57 		/* Set the personality back to the default. */
58 		if (personality(PER_LINUX) == -1) {
59 			tst_brkm(TBROK | TERRNO, NULL, "personality()");
60 			return -1;
61 		}
62 
63 		/* Redo the uname check without the PER_LINUX32 personality to
64 		 * determine the actual kernel bits value.
65 		 */
66 		kernel_bits = get_kernel_bits_from_uname(&buf);
67 		if (kernel_bits == -1)
68 			return -1;
69 
70 		/* Set the personality back to PER_LINUX32. */
71 		if (personality(PER_LINUX32) == -1) {
72 			tst_brkm(TBROK | TERRNO, NULL, "personality()");
73 			return -1;
74 		}
75 	}
76 #endif  /* __ANDROID__ */
77 
78 	tst_resm(TINFO, "uname.machine=%s kernel is %ibit",
79 	         buf.machine, kernel_bits);
80 
81 	return kernel_bits;
82 }
83 
tst_check_driver(const char * name)84 int tst_check_driver(const char *name)
85 {
86 #ifndef __ANDROID__
87 	const char * const argv[] = { "modprobe", "-n", name, NULL };
88 	int res = tst_run_cmd_(NULL, argv, "/dev/null", "/dev/null", 1);
89 
90 	/* 255 - it looks like modprobe not available */
91 	return (res == 255) ? 0 : res;
92 #else
93 	/* Android modprobe may not have '-n', or properly installed
94 	 * module.*.bin files to determine built-in drivers. Assume
95 	 * all drivers are available.
96 	 */
97 	return 0;
98 #endif
99 }
100