[CentOS] kernel bug fixed in later kernels

Wed Nov 3 22:59:28 UTC 2010
Philip Manuel <phil at zomojo.com>

Does anyone know if this is going to be fixed in CentOS ?

// test case code below
// expected behaviour is "all good" and a return code of zero.
// this works on 2.6.35-1
// does not work on 2.6.18-194.17.4.el5 from Centos 5.5

// think this bug was fixed in git commit 
// around 2.6.22

#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char** argv)
    int fd = open("foo", O_RDONLY);
       if (setuid(1000))
        printf("could not setuid, run as root with correct uid\n");
        return 1;

    char proc_name[1024];

    sprintf(proc_name, "/proc/self/fd/%d", fd);
    struct stat stat_buf;

    int rc = stat(proc_name, &stat_buf);

    if (rc == 0)
        printf("all good\n");
        printf("busted, could not access %s\n", proc_name);

    return rc;
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