Hi Mohit, Replying to the list this time. On Wed, Oct 6, 2010 at 11:31 AM, mohit verma <mohit89mlnc@xxxxxxxxx> wrote: > hi all, > a process : > current --> files_struct --> file -->cred > | | > (* files) (*fd_array) > it seems a process can have the files having different credentials . for > example let a process be running in a high privilige level . after setuid ( > or any member of family) system call it gains the lower(or higher) > priority. the process remains same with the previous opened files and there > attached credentials. > is it right that a process can have different ( or same) file opened with > different credentials ? > if so then it must be a loop hole. > i know i am missing something.please correct me at the places. It seems quite reasonable to me. If you start as root and open a file, and then do setuid to change your id to a different user and open a second file, the two files will be opened with two different sets of credentials. I don't see any loopholes... -- Dave Hylands Shuswap, BC, Canada http://www.DaveHylands.com/ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
