CODEWITHSUNDEEP
linuxlinux-kernelkernelsessionid
CraCod
CraCod

Reputation: 11

Retrieving session Id in linux kernel (Kernel Space)

I want to retrieve the sessionid of the current process in linux kernel (Kernel Space). I saw task_struct has a field sessionid but it is defined only when the macro CONFIG_AUDITSYSCALL is ON. So i tried to build the kernel with this macro ON but still i was not getting the result. Also I tried getting its value from function with CONFIG_AUDITSYSCALL on audit_get_sessionid(current) but was getting either -1 or junk value ( different from getsid(0) method in user space).

I am struck at this point. Any suggestion would be of great help.

Upvotes: 1

Views: 1790

Answers (2)

helpme
helpme

Reputation: 570

pid_vnr(task_session(current)); would do what u want!!

Upvotes: 0

kuba
kuba

Reputation: 7389

You can take a look at the getsid syscall at here: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=kernel/sys.c#l1106

SYSCALL_DEFINE1(getsid, pid_t, pid)
{
     struct task_struct *p;
     struct pid *sid;
     int retval;

     rcu_read_lock();
     if (!pid)
             sid = task_session(current);
     else {
     ...

Which suggest you can use the kernel function task_session() to get the session id.

Upvotes: 3

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