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tests/uid16: skip if real uid is larger than 16bit

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* tests/uid16.c (main): Skip if the uid returned by getuid matches
/proc/sys/kernel/overflowuid.
This commit is contained in:
Дмитрий Левин 2015-03-02 02:13:03 +00:00
parent 3a15bc8adf
commit 77e0d2dccc
1 changed files with 16 additions and 0 deletions
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16
tests/uid16.c
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@ -4,6 +4,7 @@
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/syscall.h>
int
@ -38,6 +39,21 @@ main(void)
int *list = 0;
uid = syscall(__NR_getuid);
(void) close(0);
if (open("/proc/sys/kernel/overflowuid", O_RDONLY) == 0) {
/* we trust the kernel */
char buf[sizeof(int)*3];
int n = read(0, buf, sizeof(buf) - 1);
if (n) {
buf[n] = '\0';
n = atoi(buf);
if (uid == n)
return 77;
}
close(0);
}
assert(syscall(__NR_setuid, uid) == 0);
{
/*