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setpgid return -EACCES when the child process had already performed an execve (LTP setpgid03)

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This commit is contained in:
Tomoki Shirasawa
2014-12-09 14:01:20 +09:00
parent 3c24315f91
commit 815d907ca4
2 changed files with 24 additions and 2 deletions
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1
kernel/include/process.h
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@ -328,6 +328,7 @@ struct process {
volatile int sigevent;
int nohost;
int execed;
sigset_t sigmask;
stack_t sigstack;
ihk_spinlock_t sigpendinglock;

25
kernel/syscall.c
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@ -1350,7 +1350,9 @@ SYSCALL_DECLARE(getpid)
SYSCALL_DECLARE(getppid)
{
return cpu_local_var(current)->ftn->parent->pid;
if (cpu_local_var(current)->ftn->parent)
return cpu_local_var(current)->ftn->parent->pid;
return 1; // fake init
}
void
@ -1489,7 +1491,8 @@ SYSCALL_DECLARE(execve)
struct syscall_request request IHK_DMA_ALIGN;
struct program_load_desc *desc;
struct process_vm *vm = cpu_local_var(current)->vm;
struct process *proc = cpu_local_var(current);
struct process_vm *vm = proc->vm;
struct vm_range *range;
ihk_mc_spinlock_lock_noirq(&vm->memory_range_lock);
@ -1596,6 +1599,7 @@ SYSCALL_DECLARE(execve)
/* Switch to new execution context */
dkprintf("execve(): switching to new process\n");
proc->execed = 1;
ihk_mc_switch_context(NULL, &cpu_local_var(current)->ctx,
cpu_local_var(current));
@ -1795,6 +1799,23 @@ SYSCALL_DECLARE(setpgid)
int pid = ihk_mc_syscall_arg0(ctx);
int pgid = ihk_mc_syscall_arg1(ctx);
long rc;
struct process *proc = cpu_local_var(current);
ihk_spinlock_t *lock;
unsigned long irqstate = 0;
struct process *tproc;
if(proc->ftn->pid != pid){
tproc = findthread_and_lock(pid, pid, &lock, &irqstate);
if(tproc){
if(tproc->execed){
process_unlock(lock, irqstate);
return -EACCES;
}
process_unlock(lock, irqstate);
}
else
return -ESRCH;
}
rc = syscall_generic_forwarding(__NR_setpgid, ctx);
if(rc == 0){