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drm/amdkfd: Improve kfd_process lookup in kfd_ioctl 

Use filep->private_data to store a pointer to the kfd_process data
structure. Take an extra reference for that, which gets released in
the kfd_release callback. Check that the process calling kfd_ioctl
is the same that opened the file descriptor. Return -EBADF if it's
not, so that this error can be distinguished in user mode.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling 2019-12-04 21:23:08 -05:00 committed by Alex Deucher
parent ea117312ea
commit 0f899fd466
2 changed files with 28 additions and 4 deletions
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30
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -42,6 +42,7 @@
static long kfd_ioctl(struct file *, unsigned int, unsigned long);
static int kfd_open(struct inode *, struct file *);
static int kfd_release(struct inode *, struct file *);
static int kfd_mmap(struct file *, struct vm_area_struct *);
static const char kfd_dev_name[] = "kfd";
@ -51,6 +52,7 @@ static const struct file_operations kfd_fops = {
.unlocked_ioctl = kfd_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.open = kfd_open,
.release = kfd_release,
.mmap = kfd_mmap,
};
@ -124,8 +126,13 @@ static int kfd_open(struct inode *inode, struct file *filep)
if (IS_ERR(process))
return PTR_ERR(process);
if (kfd_is_locked())
if (kfd_is_locked()) {
kfd_unref_process(process);
return -EAGAIN;
}
/* filep now owns the reference returned by kfd_create_process */
filep->private_data = process;
dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
process->pasid, process->is_32bit_user_mode);
@ -133,6 +140,16 @@ static int kfd_open(struct inode *inode, struct file *filep)
return 0;
}
static int kfd_release(struct inode *inode, struct file *filep)
{
struct kfd_process *process = filep->private_data;
if (process)
kfd_unref_process(process);
return 0;
}
static int kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
void *data)
{
@ -1801,9 +1818,14 @@ static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
dev_dbg(kfd_device, "ioctl cmd 0x%x (#0x%x), arg 0x%lx\n", cmd, nr, arg);
process = kfd_get_process(current);
if (IS_ERR(process)) {
dev_dbg(kfd_device, "no process\n");
/* Get the process struct from the filep. Only the process
* that opened /dev/kfd can use the file descriptor. Child
* processes need to create their own KFD device context.
*/
process = filep->private_data;
if (process->lead_thread != current->group_leader) {
dev_dbg(kfd_device, "Using KFD FD in wrong process\n");
retcode = -EBADF;
goto err_i1;
}

2
drivers/gpu/drm/amd/amdkfd/kfd_process.c
View File

@ -324,6 +324,8 @@ struct kfd_process *kfd_create_process(struct file *filep)
(int)process->lead_thread->pid);
}
out:
if (!IS_ERR(process))
kref_get(&process->ref);
mutex_unlock(&kfd_processes_mutex);
return process;