75d3db4911
this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
35 lines
681 B
C
35 lines
681 B
C
#include "inc.h"
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PUBLIC int check_perm(struct ipc_perm *req, endpoint_t who, int mode)
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{
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int req_mode;
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int cur_mode;
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uid_t uid = getnuid(who);
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gid_t gid = getngid(who);
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mode &= 0666;
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/* is root? */
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if (uid == 0)
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return 1;
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if (uid == req->uid || uid == req->cuid) {
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/* same user */
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req_mode = (req->mode >> 6) & 0x7;
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cur_mode = (mode >> 6) & 0x7;
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} else if (gid == req->gid || gid == req->cgid) {
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/* same group */
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req_mode = (req->mode >> 3) & 0x7;
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cur_mode = (mode >> 3) & 0x7;
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} else {
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/* other group */
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req_mode = req->mode & 0x7;
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cur_mode = mode & 0x7;
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}
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if (cur_mode && ((cur_mode & req_mode) == cur_mode))
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return 1;
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else
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return 0;
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}
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