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modify procfs to read inactive thread's files

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However, the following files can be read only if the corresponding
thread is in active.
- /proc/<PID>/mem
- /proc/<PID>/task/<TID>/mem

refs #371
This commit is contained in:
NAKAMURA Gou
2015-03-04 20:06:01 +09:00
parent fa29c34995
commit 6a82412d64
1 changed files with 20 additions and 4 deletions
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24
kernel/procfs.c
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@ -253,6 +253,7 @@ void process_procfs_request(unsigned long rarg)
unsigned long offset;
int count;
int npages;
int is_current = 1; /* is 'proc' same as 'current'? */
dprintf("process_procfs_request: invoked.\n");
@ -325,16 +326,25 @@ void process_procfs_request(unsigned long rarg)
dprintf("mismatched pid. We are %d, but requested pid is %d.\n",
pid, cpu_local_var(current)->pid);
if ((proc = findthread_and_lock(pid, tid, &savelock, &irqstate))){
tid = pid; /* main thread */
proc = findthread_and_lock(pid, tid, &savelock, &irqstate);
if (!proc) {
dprintf("We cannot find the proper cpu for requested pid.\n");
goto end;
}
else if (proc->cpu_id != ihk_mc_get_processor_id()) {
/* The target process has gone by migration. */
r->newcpu = proc->cpu_id;
dprintf("expected cpu id is %d.\n", proc->cpu_id);
process_unlock(savelock, irqstate);
ans = 0;
} else {
dprintf("We cannot find the proper cpu for requested pid.\n");
goto end;
}
else {
process_unlock(savelock, irqstate);
/* 'proc' is not 'current' */
is_current = 0;
}
goto end;
}
}
else if (!strcmp(p, "stat")) { /* "/proc/stat" */
@ -381,6 +391,9 @@ void process_procfs_request(unsigned long rarg)
struct vm_range *range;
struct process_vm *vm = proc->vm;
if (!is_current) {
goto end;
}
list_for_each_entry(range, &vm->vm_range_list, list) {
dprintf("range: %lx - %lx\n", range->start, range->end);
if ((range->start <= r->offset) &&
@ -539,6 +552,9 @@ void process_procfs_request(unsigned long rarg)
struct vm_range *range;
struct process_vm *vm = proc->vm;
if (!is_current) {
goto end;
}
if (pid != tid) {
/* We are not multithreaded yet. */
goto end;