Last change
on this file since 403 was 342, checked in by coas-nagasima, 6 years ago |
syscallが関数呼びになるよう変更
他更新
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File size:
972 bytes
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1 | #include <unistd.h>
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2 | #include <errno.h>
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3 | #include "syscall.h"
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4 | #include "libc.h"
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5 | #include "pthread_impl.h"
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6 |
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7 | struct ctx {
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8 | int id, eid, sid;
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9 | int nr, err;
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10 | };
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11 |
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12 | static void do_setxid(void *p)
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13 | {
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14 | struct ctx *c = p;
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15 | if (c->err>0) return;
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16 | int ret = -__syscall_nr(c->nr, c->id, c->eid, c->sid);
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17 | if (ret && !c->err) {
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18 | /* If one thread fails to set ids after another has already
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19 | * succeeded, forcibly killing the process is the only safe
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20 | * thing to do. State is inconsistent and dangerous. Use
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21 | * SIGKILL because it is uncatchable. */
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22 | __block_all_sigs(0);
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23 | __syscall(SYS_kill, __syscall(SYS_getpid), SIGKILL);
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24 | }
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25 | c->err = ret;
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26 | }
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27 |
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28 | int __setxid(int nr, int id, int eid, int sid)
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29 | {
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30 | /* err is initially nonzero so that failure of the first thread does not
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31 | * trigger the safety kill above. */
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32 | struct ctx c = { .nr = nr, .id = id, .eid = eid, .sid = sid, .err = -1 };
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33 | __synccall(do_setxid, &c);
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34 | if (c.err) {
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35 | if (c.err>0) errno = c.err;
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36 | return -1;
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37 | }
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38 | return 0;
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39 | }
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