-
Notifications
You must be signed in to change notification settings - Fork 193
/
libos_uname.c
73 lines (58 loc) · 2.09 KB
/
libos_uname.c
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
/* SPDX-License-Identifier: LGPL-3.0-or-later */
/* Copyright (C) 2014 Stony Brook University
* Copyright (C) 2020 Invisible Things Lab
* Michał Kowalczyk <[email protected]>
*/
/*
* Implementation of system calls `uname`, `sethostname` and `setdomainname`.
*/
#include <errno.h>
#include <sys/utsname.h>
#include "api.h"
#include "libos_internal.h"
#include "libos_table.h"
/* This structure is *not* shared between Gramine processes, despite it should. As a result,
* effects of set{host,domain}name in process A will not be visible in process B.
* These syscalls are rarely used and are implemented in Gramine mainly to enable LTP to test
* our `uname` implementation. */
static struct new_utsname g_current_uname = {
.sysname = "Linux",
.nodename = "localhost",
.release = "3.10.0",
.version = "1",
#ifdef __x86_64__
.machine = "x86_64",
#else
#error "Not implemented"
#endif
.domainname = "(none)", /* this seems to be the default on Linux */
};
long libos_syscall_uname(struct new_utsname* buf) {
if (!is_user_memory_writable(buf, sizeof(*buf)))
return -EFAULT;
memcpy(buf, &g_current_uname, sizeof(g_current_uname));
return 0;
}
int set_hostname(char* name, size_t len) {
if (len >= sizeof(g_current_uname.nodename))
return -EINVAL;
memcpy(&g_current_uname.nodename, name, len);
memset(&g_current_uname.nodename[len], 0, sizeof(g_current_uname.nodename) - len);
return 0;
}
long libos_syscall_sethostname(char* name, int len) {
if (len < 0 || (size_t)len >= sizeof(g_current_uname.nodename))
return -EINVAL;
if (!is_user_memory_readable(name, len))
return -EFAULT;
return set_hostname(name, len);
}
long libos_syscall_setdomainname(char* name, int len) {
if (len < 0 || (size_t)len >= sizeof(g_current_uname.domainname))
return -EINVAL;
if (!is_user_memory_readable(name, len))
return -EFAULT;
memcpy(&g_current_uname.domainname, name, len);
memset(&g_current_uname.domainname[len], 0, sizeof(g_current_uname.domainname) - len);
return 0;
}