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ptools
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* t_access_root.c - trivial test program to show permission bug.
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*
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* Written by Michael Kerrisk - copyright ownership not pursued.
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* Sourced from: http://linux.derkeiler.com/Mailing-Lists/Kernel/2003-10/6030.html
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*/
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#include <limits.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#define UID 500
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#define GID 100
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#define PERM 0
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#define TESTPATH "/tmp/t_access"
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static void
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errExit(char *msg)
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{
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perror(msg);
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exit(EXIT_FAILURE);
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} /* errExit */
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static void
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accessTest(char *file, int mask, char *mstr)
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{
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printf("access(%s, %s) returns %d\n", file, mstr, access(file, mask));
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} /* accessTest */
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int
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main(int argc, char *argv[])
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{
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int fd, perm, uid, gid;
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char *testpath;
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char cmd[PATH_MAX + 20];
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testpath = (argc > 1) ? argv[1] : TESTPATH;
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perm = (argc > 2) ? strtoul(argv[2], NULL, 8) : PERM;
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uid = (argc > 3) ? atoi(argv[3]) : UID;
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gid = (argc > 4) ? atoi(argv[4]) : GID;
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unlink(testpath);
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fd = open(testpath, O_RDWR | O_CREAT, 0);
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if (fd == -1) errExit("open");
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if (fchown(fd, uid, gid) == -1) errExit("fchown");
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if (fchmod(fd, perm) == -1) errExit("fchmod");
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close(fd);
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snprintf(cmd, sizeof(cmd), "ls -l %s", testpath);
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system(cmd);
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if (seteuid(uid) == -1) errExit("seteuid");
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accessTest(testpath, 0, "0");
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accessTest(testpath, R_OK, "R_OK");
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accessTest(testpath, W_OK, "W_OK");
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accessTest(testpath, X_OK, "X_OK");
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accessTest(testpath, R_OK | W_OK, "R_OK | W_OK");
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accessTest(testpath, R_OK | X_OK, "R_OK | X_OK");
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accessTest(testpath, W_OK | X_OK, "W_OK | X_OK");
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accessTest(testpath, R_OK | W_OK | X_OK, "R_OK | W_OK | X_OK");
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exit(EXIT_SUCCESS);
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} /* main */
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