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| 6 | #include <sys/mman.h> |
6 | #include <sys/mman.h> |
| 7 | |
7 | |
| 8 | #undef _GNU_SOURCE |
8 | #undef _GNU_SOURCE |
| 9 | #define _GNU_SOURCE |
9 | #define _GNU_SOURCE |
| 10 | #include <sched.h> |
10 | #include <sched.h> |
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11 | #include <unistd.h> |
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12 | #include <sys/syscall.h> |
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13 | |
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14 | #include <sched.h> |
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15 | |
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16 | #include <sys/ioctl.h> |
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17 | #include <net/if.h> |
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18 | |
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19 | #include <linux/nsfs.h> |
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20 | #include <linux/kcmp.h> |
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21 | |
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22 | /* kcmp.h does not define symbols, so there is no way to detect preesence of enum */ |
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23 | /* members, so we just hardcode new symbols here. */ |
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24 | #ifndef KCMP_EPOLL_TFD |
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25 | #define KCMP_EPOLL_TFD 7 |
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26 | #endif |
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27 | |
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28 | #ifdef __has_include |
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29 | #if !__has_include("linux/kcmp.h") // use "" as GCC wrongly expands macros |
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30 | #undef SYS_kcmp |
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31 | #endif |
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32 | #endif |
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33 | |
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34 | #ifdef SYS_kcmp |
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35 | #include "linux/kcmp.h" |
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36 | #define kcmp(pid1,pid2,type,idx1,idx2) \ |
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37 | syscall (SYS_kcmp, (pid_t)pid1, (pid_t)pid2, \ |
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38 | (int)type, (unsigned long)idx1, (unsigned long)idx2) |
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39 | #else |
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40 | #define kcmp(pid1,pid2,type,idx1,idx2) \ |
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41 | (errno = ENOSYS, -1) |
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42 | #endif |
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43 | |
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44 | /* from schmorp.h */ |
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45 | static int |
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46 | s_fileno (SV *fh, int wr) |
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47 | { |
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48 | dTHX; |
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49 | SvGETMAGIC (fh); |
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50 | |
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51 | if (SvROK (fh)) |
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52 | { |
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53 | fh = SvRV (fh); |
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54 | SvGETMAGIC (fh); |
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55 | } |
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56 | |
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57 | if (SvTYPE (fh) == SVt_PVGV) |
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58 | return PerlIO_fileno (wr ? IoOFP (sv_2io (fh)) : IoIFP (sv_2io (fh))); |
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59 | |
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60 | if (SvOK (fh) && (SvIV (fh) >= 0) && (SvIV (fh) < 0x7fffffffL)) |
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61 | return SvIV (fh); |
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62 | |
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63 | return -1; |
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64 | } |
| 11 | |
65 | |
| 12 | static int |
66 | static int |
| 13 | clone_cb (void *arg) |
67 | clone_cb (void *arg) |
| 14 | { |
68 | { |
| 15 | dSP; |
69 | dSP; |
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| 34 | |
88 | |
| 35 | static const struct { |
89 | static const struct { |
| 36 | const char *name; |
90 | const char *name; |
| 37 | IV iv; |
91 | IV iv; |
| 38 | } *civ, const_iv[] = { |
92 | } *civ, const_iv[] = { |
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93 | # define const_iv(name) { # name, (IV)name }, |
| 39 | # define const_iv(name) { # name, (IV) CLONE_ ## name }, |
94 | # define const_iv_clone(name) { # name, (IV) CLONE_ ## name }, |
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95 | # ifdef CSIGNAL |
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96 | const_iv (CSIGNAL) |
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97 | # endif |
| 40 | # ifdef CLONE_FILES |
98 | # ifdef CLONE_FILES |
| 41 | const_iv (FILES) |
99 | const_iv_clone (FILES) |
| 42 | # endif |
100 | # endif |
| 43 | # ifdef CLONE_FS |
101 | # ifdef CLONE_FS |
| 44 | const_iv (FS) |
102 | const_iv_clone (FS) |
| 45 | # endif |
103 | # endif |
| 46 | # ifdef CLONE_NEWNS |
104 | # ifdef CLONE_NEWNS |
| 47 | const_iv (NEWNS) |
105 | const_iv_clone (NEWNS) |
| 48 | # endif |
106 | # endif |
| 49 | # ifdef CLONE_VM |
107 | # ifdef CLONE_VM |
| 50 | const_iv (VM) |
108 | const_iv_clone (VM) |
| 51 | # endif |
109 | # endif |
| 52 | # ifdef CLONE_THREAD |
110 | # ifdef CLONE_THREAD |
| 53 | const_iv (THREAD) |
111 | const_iv_clone (THREAD) |
| 54 | # endif |
112 | # endif |
| 55 | # ifdef CLONE_SIGHAND |
113 | # ifdef CLONE_SIGHAND |
| 56 | const_iv (SIGHAND) |
114 | const_iv_clone (SIGHAND) |
| 57 | # endif |
115 | # endif |
| 58 | # ifdef CLONE_SYSVSEM |
116 | # ifdef CLONE_SYSVSEM |
| 59 | const_iv (SYSVSEM) |
117 | const_iv_clone (SYSVSEM) |
| 60 | # endif |
118 | # endif |
| 61 | # ifdef CLONE_NEWUTS |
119 | # ifdef CLONE_NEWUTS |
| 62 | const_iv (NEWUTS) |
120 | const_iv_clone (NEWUTS) |
| 63 | # endif |
121 | # endif |
| 64 | # ifdef CLONE_NEWIPC |
122 | # ifdef CLONE_NEWIPC |
| 65 | const_iv (NEWIPC) |
123 | const_iv_clone (NEWIPC) |
| 66 | # endif |
124 | # endif |
| 67 | # ifdef CLONE_NEWNET |
125 | # ifdef CLONE_NEWNET |
| 68 | const_iv (NEWNET) |
126 | const_iv_clone (NEWNET) |
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127 | # endif |
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128 | # ifdef CLONE_NEWTIME |
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129 | const_iv_clone (NEWTIME) |
| 69 | # endif |
130 | # endif |
| 70 | # ifdef CLONE_PTRACE |
131 | # ifdef CLONE_PTRACE |
| 71 | const_iv (PTRACE) |
132 | const_iv_clone (PTRACE) |
| 72 | # endif |
133 | # endif |
| 73 | # ifdef CLONE_VFORK |
134 | # ifdef CLONE_VFORK |
| 74 | const_iv (VFORK) |
135 | const_iv_clone (VFORK) |
| 75 | # endif |
136 | # endif |
| 76 | # ifdef CLONE_SETTLS |
137 | # ifdef CLONE_SETTLS |
| 77 | const_iv (SETTLS) |
138 | const_iv_clone (SETTLS) |
| 78 | # endif |
139 | # endif |
| 79 | # ifdef CLONE_PARENT_SETTID |
140 | # ifdef CLONE_PARENT_SETTID |
| 80 | const_iv (PARENT_SETTID) |
141 | const_iv_clone (PARENT_SETTID) |
| 81 | # endif |
142 | # endif |
| 82 | # ifdef CLONE_CHILD_CLEARTID |
143 | # ifdef CLONE_CHILD_CLEARTID |
| 83 | const_iv (CHILD_CLEARTID) |
144 | const_iv_clone (CHILD_CLEARTID) |
| 84 | # endif |
145 | # endif |
| 85 | # ifdef CLONE_DETACHED |
146 | # ifdef CLONE_DETACHED |
| 86 | const_iv (DETACHED) |
147 | const_iv_clone (DETACHED) |
| 87 | # endif |
148 | # endif |
| 88 | # ifdef CLONE_UNTRACED |
149 | # ifdef CLONE_UNTRACED |
| 89 | const_iv (UNTRACED) |
150 | const_iv_clone (UNTRACED) |
| 90 | # endif |
151 | # endif |
| 91 | # ifdef CLONE_CHILD_SETTID |
152 | # ifdef CLONE_CHILD_SETTID |
| 92 | const_iv (CHILD_SETTID) |
153 | const_iv_clone (CHILD_SETTID) |
| 93 | # endif |
154 | # endif |
| 94 | # ifdef CLONE_NEWUSER |
155 | # ifdef CLONE_NEWUSER |
| 95 | const_iv (NEWUSER) |
156 | const_iv_clone (NEWUSER) |
| 96 | # endif |
157 | # endif |
| 97 | # ifdef CLONE_NEWPID |
158 | # ifdef CLONE_NEWPID |
| 98 | const_iv (NEWPID) |
159 | const_iv_clone (NEWPID) |
| 99 | # endif |
160 | # endif |
| 100 | # ifdef CLONE_IO |
161 | # ifdef CLONE_IO |
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162 | const_iv_clone (IO) |
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163 | # endif |
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164 | # ifdef CLONE_NEWCGROUP |
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165 | const_iv_clone (NEWCGROUP) |
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166 | # endif |
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167 | # ifdef CLONE_PIDFD |
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168 | const_iv_clone (PIDFD) |
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169 | # endif |
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170 | # ifdef SYS_kcmp |
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171 | const_iv (KCMP_FILE) |
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172 | const_iv (KCMP_VM) |
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173 | const_iv (KCMP_FILES) |
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174 | const_iv (KCMP_FS) |
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175 | const_iv (KCMP_SIGHAND) |
| 101 | const_iv (IO) |
176 | const_iv (KCMP_IO) |
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177 | const_iv (KCMP_SYSVSEM) |
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178 | const_iv (KCMP_EPOLL_TFD) |
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179 | # endif |
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180 | # ifdef NS_GET_USERNS |
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181 | const_iv (NS_GET_USERNS) |
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182 | # endif |
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183 | # ifdef NS_GET_PARENT |
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184 | const_iv (NS_GET_PARENT) |
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185 | # endif |
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186 | # ifdef NS_GET_NSTYPE |
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187 | const_iv (NS_GET_NSTYPE) |
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188 | # endif |
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189 | # ifdef NS_OWNER_UID |
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190 | const_iv (NS_OWNER_UID |
| 102 | # endif |
191 | # endif |
| 103 | }; |
192 | }; |
| 104 | |
193 | |
| 105 | for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ > const_iv; civ--) |
194 | for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ > const_iv; civ--) |
| 106 | newCONSTSUB (stash, (char *)civ[-1].name, newSViv (civ[-1].iv)); |
195 | newCONSTSUB (stash, (char *)civ[-1].name, newSViv (civ[-1].iv)); |
| 107 | |
196 | |
| 108 | int |
197 | int |
| 109 | unshare (int flags) |
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| 110 | CODE: |
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| 111 | RETVAL = unshare (flags); |
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| 112 | OUTPUT: |
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| 113 | RETVAL |
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| 114 | |
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| 115 | int |
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| 116 | clone (SV *sub, IV stacksize, int flags, SV *ptid = 0, SV *tls = &PL_sv_undef) |
198 | clone (SV *sub, IV stacksize, int flags, SV *ptid = 0, SV *tls = &PL_sv_undef) |
| 117 | CODE: |
199 | CODE: |
| 118 | { |
200 | { |
| 119 | if (!stacksize) |
201 | if (!stacksize) |
| 120 | stacksize = 4 << 20; |
202 | stacksize = 4 << 20; |
| 121 | |
203 | |
| 122 | pid_t ptid_; |
204 | pid_t ptid_; |
| 123 | char *stack_ptr = mmap (0, stacksize, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN | MAP_STACK, -1, 0); |
205 | char *stack_ptr = mmap (0, stacksize, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN | MAP_STACK, -1, 0); |
| 124 | |
206 | |
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| 141 | munmap (stack_ptr, stacksize); |
223 | munmap (stack_ptr, stacksize); |
| 142 | errno = old_errno; |
224 | errno = old_errno; |
| 143 | } |
225 | } |
| 144 | } |
226 | } |
| 145 | } |
227 | } |
| 146 | OUTPUT: |
228 | OUTPUT: RETVAL |
| 147 | RETVAL |
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| 148 | |
229 | |
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230 | int |
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231 | unshare (int flags) |
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232 | PROTOTYPE: @ |
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233 | |
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234 | int |
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235 | setns (SV *fh_or_fd, int nstype = 0) |
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236 | C_ARGS: s_fileno (fh_or_fd, 0), nstype |
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237 | |
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238 | int |
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239 | pivot_root (SV *new_root, SV *old_root) |
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240 | CODE: |
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241 | RETVAL = syscall (SYS_pivot_root, |
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242 | (const char *)SvPVbyte_nolen (new_root), |
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243 | (const char *)SvPVbyte_nolen (old_root)); |
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244 | OUTPUT: RETVAL |
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245 | |
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246 | int |
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247 | kcmp (IV pid1, IV pid2, IV type, UV idx1 = 0, UV idx2 = 0) |
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248 | |
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249 | int |
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250 | siocsifflags (char *ifname, U32 flags = IFF_UP) |
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251 | CODE: |
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252 | { |
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253 | int saved_errno; |
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254 | struct ifreq ifr; |
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255 | int fd = socket (AF_INET, SOCK_DGRAM, 0); |
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256 | strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); |
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257 | RETVAL = ioctl (fd, SIOCSIFFLAGS, &ifr); |
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258 | saved_errno = errno; |
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259 | close (fd); |
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260 | errno = saved_errno; |
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261 | } |
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262 | OUTPUT: RETVAL |
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263 | |
