Dmitry V. Levin
04fcb99972
* tests/uid.c (main): Skip if the uid returned by getuid matches /proc/sys/kernel/overflowuid.
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <assert.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/syscall.h>
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int
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main(void)
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{
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#if (defined __NR_getuid || defined __NR_getxuid) \
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&& defined(__NR_setuid) \
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&& defined(__NR_getresuid) \
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&& defined(__NR_setreuid) \
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&& defined(__NR_setresuid) \
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&& defined(__NR_fchown) \
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&& defined(__NR_getgroups)
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int uid;
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int size;
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int *list = 0;
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#ifndef __NR_getuid
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# define __NR_getuid __NR_getxuid
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#endif
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uid = syscall(__NR_getuid);
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(void) close(0);
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if (open("/proc/sys/kernel/overflowuid", O_RDONLY) == 0) {
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/* we trust the kernel */
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char buf[sizeof(int)*3];
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int n = read(0, buf, sizeof(buf) - 1);
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if (n) {
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buf[n] = '\0';
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n = atoi(buf);
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if (uid == n)
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return 77;
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}
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(void) close(0);
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}
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assert(syscall(__NR_setuid, uid) == 0);
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{
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/*
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* uids returned by getresuid should be ignored
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* to avoid 16bit vs 32bit issues.
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*/
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int r, e, s;
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assert(syscall(__NR_getresuid, &r, &e, &s) == 0);
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}
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assert(syscall(__NR_setreuid, -1, -1L) == 0);
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assert(syscall(__NR_setresuid, uid, -1, -1L) == 0);
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assert(syscall(__NR_fchown, 1, -1, -1L) == 0);
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assert((size = syscall(__NR_getgroups, 0, list)) >= 0);
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assert(list = calloc(size + 1, sizeof(*list)));
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assert(syscall(__NR_getgroups, size, list) == size);
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return 0;
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#else
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return 77;
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#endif
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}
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