1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Capability utilities 3 * Capability utilities
4 */ 4 */
5 5
6 #include "cap.h" !! 6 #ifdef HAVE_LIBCAP_SUPPORT
7 #include "debug.h" <<
8 #include <errno.h> <<
9 #include <string.h> <<
10 #include <linux/capability.h> <<
11 #include <sys/syscall.h> <<
12 #include <unistd.h> <<
13 7
14 #define MAX_LINUX_CAPABILITY_U32S _LINUX_CAPAB !! 8 #include "cap.h"
>> 9 #include <stdbool.h>
>> 10 #include <sys/capability.h>
15 11
16 bool perf_cap__capable(int cap, bool *used_roo !! 12 bool perf_cap__capable(cap_value_t cap)
17 { 13 {
18 struct __user_cap_header_struct header !! 14 cap_flag_value_t val;
19 .version = _LINUX_CAPABILITY_V !! 15 cap_t caps = cap_get_proc();
20 .pid = 0, !! 16
21 }; !! 17 if (!caps)
22 struct __user_cap_data_struct data[MAX !! 18 return false;
23 __u32 cap_val; !! 19
24 !! 20 if (cap_get_flag(caps, cap, CAP_EFFECTIVE, &val) != 0)
25 *used_root = false; !! 21 val = CAP_CLEAR;
26 while (syscall(SYS_capget, &header, &d !! 22
27 /* Retry, first attempt has se !! 23 if (cap_free(caps) != 0)
28 if (errno == EINVAL && header. !! 24 return false;
29 header.version == _LINUX_C !! 25
30 continue; !! 26 return val == CAP_SET;
31 <<
32 pr_debug2("capget syscall fail <<
33 strerror(errno), err <<
34 *used_root = true; <<
35 return geteuid() == 0; <<
36 } <<
37 <<
38 /* Extract the relevant capability bit <<
39 if (cap >= 32) { <<
40 if (header.version == _LINUX_C <<
41 cap_val = data[1].effe <<
42 } else { <<
43 /* Capability beyond 3 <<
44 return false; <<
45 } <<
46 } else { <<
47 cap_val = data[0].effective; <<
48 } <<
49 return (cap_val & (1 << (cap & 0x1f))) <<
50 } 27 }
>> 28
>> 29 #endif /* HAVE_LIBCAP_SUPPORT */
51 30
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