3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
4 // based on syscall.cc by Jacques Gelinas
6 // This program is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 2, or (at your option)
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 This tells the system call number for new_s_context and set_ipv4root
22 using /proc/self/status. This helps until the vserver project is
23 included officially in the kernel (and has its own syscall).
25 We rely on /proc/self/status to find the syscall number.
27 If it is not there, we rely on adm/unistd.h.
29 If this file does not have those system calls (not a patched kernel source)
30 we rely on static values in this file.
37 #include <asm/unistd.h>
39 // Here is the trick. We keep a copy of the define, then undef it
40 // and then later, we try to locate the value reading /proc/self/status
41 // If this fails, we have the old preserved copy.
42 static int def_NR_set_ipv4root = 274;
43 #undef __NR_set_ipv4root
45 static int __NR_set_ipv4root_rev0;
46 static int __NR_set_ipv4root_rev1;
47 static int __NR_set_ipv4root_rev2;
48 static int __NR_set_ipv4root_rev3;
49 static int rev_ipv4root=0;
52 static _syscall1(int, set_ipv4root_rev0, unsigned long, ip)
53 static _syscall2(int, set_ipv4root_rev1, unsigned long, ip, unsigned long, bcast)
54 static _syscall3(int, set_ipv4root_rev2, unsigned long *, ip, int, nb, unsigned long, bcast)
55 static _syscall4(int, set_ipv4root_rev3, unsigned long *, ip, int, nb, unsigned long, bcast, unsigned long *, mask)
57 static int def_NR_new_s_context = 273;
58 #undef __NR_new_s_context
59 static int __NR_new_s_context_rev0;
60 //static int __NR_new_s_context_rev1;
61 static int rev_s_context=0;
63 static _syscall3(int, new_s_context_rev0, int, newctx, int, remove_cap, int, flags)
64 //static _syscall4(int, new_s_context_rev1, int, nbctx, int *, ctxs, int, remove_cap, int, flags)
67 #undef __NR_set_ctxlimit
68 static int __NR_set_ctxlimit=-1;
69 static int rev_set_ctxlimit=-1;
71 static _syscall2 (int, set_ctxlimit, int, resource, long, limit)
74 #undef __NR_chrootsafe
75 static int __NR_chrootsafe=-1;
76 static int rev_chrootsafe=-1;
78 static _syscall1 (int, chrootsafe, const char *, dir)
82 static int is_init = 0;
84 FILE *fin = fopen ("/proc/self/status","r");
85 __NR_set_ipv4root_rev0 = def_NR_set_ipv4root;
86 __NR_set_ipv4root_rev1 = def_NR_set_ipv4root;
87 __NR_set_ipv4root_rev2 = def_NR_set_ipv4root;
88 __NR_set_ipv4root_rev3 = def_NR_set_ipv4root;
89 __NR_new_s_context_rev0 = def_NR_new_s_context;
90 //__NR_new_s_context_rev1 = def_NR_new_s_context;
93 while (fgets(line,sizeof(line)-1,fin)!=NULL){
95 char title[100],rev[100];
97 if (sscanf(line,"%s %d %s",title,&num,rev)>=2){
98 if (strcmp(title,"__NR_set_ipv4root:")==0){
99 __NR_set_ipv4root_rev0 = num;
100 __NR_set_ipv4root_rev1 = num;
101 __NR_set_ipv4root_rev2 = num;
102 __NR_set_ipv4root_rev3 = num;
103 if (strncmp(rev,"rev",3)==0){
104 rev_ipv4root = atoi(rev+3);
107 }else if (strcmp(title,"__NR_set_ctxlimit:")==0){
108 __NR_set_ctxlimit = num;
109 if (strncmp(rev,"rev",3)==0){
110 rev_set_ctxlimit = atoi(rev+3);
113 }else if (strcmp(title,"__NR_chrootsafe:")==0){
114 __NR_chrootsafe = num;
115 if (strncmp(rev,"rev",3)==0){
116 rev_chrootsafe = atoi(rev+3);
118 }else if (strcmp(title,"__NR_new_s_context:")==0){
119 __NR_new_s_context_rev0 = num;
120 //__NR_new_s_context_rev1 = num;
121 if (strncmp(rev,"rev",3)==0){
122 rev_s_context = atoi(rev+3);
133 void vc_init_legacy()
138 static ALWAYSINLINE int
139 vc_new_s_context_legacy(int ctx, int remove_cap, int flags)
143 if (rev_s_context == 0){
144 return new_s_context_rev0(ctx, remove_cap, flags);
152 static ALWAYSINLINE int
153 vc_set_ipv4root_legacy_internal (
157 unsigned long mask[])
160 if (rev_ipv4root == 0){
162 fprintf (stderr,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
164 return set_ipv4root_rev0 (ip[0]);
165 }else if (rev_ipv4root == 1){
167 fprintf (stderr,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
169 return set_ipv4root_rev1 (ip[0],bcast);
170 }else if (rev_ipv4root == 2){
171 return set_ipv4root_rev2 (ip,nb,bcast);
172 }else if (rev_ipv4root == 3){
173 return set_ipv4root_rev3 (ip,nb,bcast,mask);
179 static ALWAYSINLINE int
180 vc_set_ipv4root_legacy(uint32_t bcast, size_t nb, struct vc_ip_mask_pair const *ips)
182 unsigned long ip[nb];
183 unsigned long mask[nb];
186 for (i=0; i<nb; ++i) {
188 mask[i] = ips[i].mask;
191 return vc_set_ipv4root_legacy_internal(ip, nb, bcast, mask);
194 static ALWAYSINLINE int
195 vc_chrootsafe_legacy (const char *dir)
198 if (rev_chrootsafe == -1){
199 vc_tell_unsafe_chroot();
200 }else if (rev_chrootsafe == 0){
201 return chrootsafe (dir);
203 fprintf (stderr,"chrootsafe: kernel support version %d, application expects version 0\n"
212 Return != 0 if chrootsafe is available
217 return rev_chrootsafe != -1;
220 int call_set_ctxlimit (int res, long limit)
223 if (rev_set_ctxlimit == -1){
224 fprintf (stderr,"set_ctxlimit: Unsupported system call, update kernel\n");
225 }else if (rev_set_ctxlimit == 0){
226 return set_ctxlimit (res,limit);
228 fprintf (stderr,"set_ctxlimit: kernel support version %d, application expects version 0\n"