36 lines
674 B
C
36 lines
674 B
C
#include "inc.h"
|
|
|
|
int check_perm(struct ipc_perm *req, endpoint_t who, int mode)
|
|
{
|
|
int req_mode;
|
|
int cur_mode;
|
|
uid_t uid = getnuid(who);
|
|
gid_t gid = getngid(who);
|
|
|
|
mode &= 0666;
|
|
|
|
/* is root? */
|
|
if (uid == 0)
|
|
return 1;
|
|
|
|
if (uid == req->uid || uid == req->cuid) {
|
|
/* same user */
|
|
req_mode = (req->mode >> 6) & 0x7;
|
|
cur_mode = (mode >> 6) & 0x7;
|
|
} else if (gid == req->gid || gid == req->cgid) {
|
|
/* same group */
|
|
req_mode = (req->mode >> 3) & 0x7;
|
|
cur_mode = (mode >> 3) & 0x7;
|
|
} else {
|
|
/* other group */
|
|
req_mode = req->mode & 0x7;
|
|
cur_mode = mode & 0x7;
|
|
}
|
|
|
|
if (cur_mode && ((cur_mode & req_mode) == cur_mode))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|