1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
package container
import (
"syscall"
"unsafe"
)
const (
CAP_SYS_ADMIN = 0x15
CAP_SETPCAP = 0x8
)
const (
SUID_DUMP_DISABLE = iota
SUID_DUMP_USER
)
func SetDumpable(dumpable uintptr) error {
// linux/sched/coredump.h
if _, _, errno := syscall.Syscall(syscall.SYS_PRCTL, syscall.PR_SET_DUMPABLE, dumpable, 0); errno != 0 {
return errno
}
return nil
}
const (
_LINUX_CAPABILITY_VERSION_3 = 0x20080522
PR_CAP_AMBIENT = 0x2f
PR_CAP_AMBIENT_RAISE = 0x2
PR_CAP_AMBIENT_CLEAR_ALL = 0x4
)
type (
capHeader struct {
version uint32
pid int32
}
capData struct {
effective uint32
permitted uint32
inheritable uint32
}
)
// See CAP_TO_INDEX in linux/capability.h:
func capToIndex(cap uintptr) uintptr { return cap >> 5 }
// See CAP_TO_MASK in linux/capability.h:
func capToMask(cap uintptr) uint32 { return 1 << uint(cap&31) }
func capset(hdrp *capHeader, datap *[2]capData) error {
if _, _, errno := syscall.Syscall(syscall.SYS_CAPSET,
uintptr(unsafe.Pointer(hdrp)),
uintptr(unsafe.Pointer(&datap[0])), 0); errno != 0 {
return errno
}
return nil
}
// IgnoringEINTR makes a function call and repeats it if it returns an
// EINTR error. This appears to be required even though we install all
// signal handlers with SA_RESTART: see #22838, #38033, #38836, #40846.
// Also #20400 and #36644 are issues in which a signal handler is
// installed without setting SA_RESTART. None of these are the common case,
// but there are enough of them that it seems that we can't avoid
// an EINTR loop.
func IgnoringEINTR(fn func() error) error {
for {
err := fn()
if err != syscall.EINTR {
return err
}
}
}
|
