Fix out-of-bounds issue in userq fence create when
accessing the userq xa structure. Added a lock to
protect the race condition.
v2:(Christian)
- Acquire xa lock only for the xa_for_each blocks and
not for the kvmalloc_array() memory allocation part.
v3:
- Replacing the kvmalloc_array() storage with xa_alloc()
solves the problem.
BUG: KASAN: slab-out-of-bounds in amdgpu_userq_fence_create+0x726/0x880 [amdgpu]
[ +0.000006] Call Trace:
[ +0.000005] <TASK>
[ +0.000005] dump_stack_lvl+0x6c/0x90
[ +0.000011] print_report+0xc4/0x5e0
[ +0.000009] ? srso_return_thunk+0x5/0x5f
[ +0.000008] ? kasan_complete_mode_report_info+0x26/0x1d0
[ +0.000007] ? amdgpu_userq_fence_create+0x726/0x880 [amdgpu]
[ +0.000405] kasan_report+0xdf/0x120
[ +0.000009] ? amdgpu_userq_fence_create+0x726/0x880 [amdgpu]
[ +0.000405] __asan_report_store8_noabort+0x17/0x20
[ +0.000007] amdgpu_userq_fence_create+0x726/0x880 [amdgpu]
[ +0.000406] ? __pfx_amdgpu_userq_fence_create+0x10/0x10 [amdgpu]
[ +0.000408] ? srso_return_thunk+0x5/0x5f
[ +0.000008] ? ttm_resource_move_to_lru_tail+0x235/0x4f0 [ttm]
[ +0.000013] ? srso_return_thunk+0x5/0x5f
[ +0.000008] amdgpu_userq_signal_ioctl+0xd29/0x1c70 [amdgpu]
[ +0.000412] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu]
[ +0.000404] ? try_to_wake_up+0x165/0x1840
[ +0.000010] ? __pfx_futex_wake_mark+0x10/0x10
[ +0.000011] drm_ioctl_kernel+0x178/0x2f0 [drm]
[ +0.000050] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu]
[ +0.000404] ? __pfx_drm_ioctl_kernel+0x10/0x10 [drm]
[ +0.000043] ? __kasan_check_read+0x11/0x20
[ +0.000007] ? srso_return_thunk+0x5/0x5f
[ +0.000007] ? __kasan_check_write+0x14/0x20
[ +0.000008] drm_ioctl+0x513/0xd20 [drm]
[ +0.000040] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu]
[ +0.000407] ? __pfx_drm_ioctl+0x10/0x10 [drm]
[ +0.000044] ? srso_return_thunk+0x5/0x5f
[ +0.000007] ? _raw_spin_lock_irqsave+0x99/0x100
[ +0.000007] ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[ +0.000006] ? __rseq_handle_notify_resume+0x188/0xc30
[ +0.000008] ? srso_return_thunk+0x5/0x5f
[ +0.000008] ? srso_return_thunk+0x5/0x5f
[ +0.000006] ? _raw_spin_unlock_irqrestore+0x27/0x50
[ +0.000010] amdgpu_drm_ioctl+0xcd/0x1d0 [amdgpu]
[ +0.000388] __x64_sys_ioctl+0x135/0x1b0
[ +0.000009] x64_sys_call+0x1205/0x20d0
[ +0.000007] do_syscall_64+0x4d/0x120
[ +0.000008] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ +0.000007] RIP: 0033:0x7f7c3d31a94f
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
---
.../gpu/drm/amd/amdgpu/amdgpu_userq_fence.c | 43 +++++++------------
.../gpu/drm/amd/amdgpu/amdgpu_userq_fence.h | 3 +-
2 files changed, 17 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
index 2e7271362ace..4289bed6c1f7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
@@ -122,10 +122,11 @@ int amdgpu_userq_fence_driver_alloc(struct amdgpu_device *adev,
void amdgpu_userq_fence_driver_process(struct amdgpu_userq_fence_driver *fence_drv)
{
+ struct amdgpu_userq_fence_driver *stored_fence_drv;
struct amdgpu_userq_fence *userq_fence, *tmp;
struct dma_fence *fence;
+ unsigned long index;
u64 rptr;
- int i;
if (!fence_drv)
return;
@@ -141,8 +142,8 @@ void amdgpu_userq_fence_driver_process(struct amdgpu_userq_fence_driver *fence_d
dma_fence_signal(fence);
- for (i = 0; i < userq_fence->fence_drv_array_count; i++)
- amdgpu_userq_fence_driver_put(userq_fence->fence_drv_array[i]);
+ xa_for_each(&userq_fence->fence_drv_xa, index, stored_fence_drv)
+ amdgpu_userq_fence_driver_put(stored_fence_drv);
list_del(&userq_fence->link);
dma_fence_put(fence);
@@ -221,34 +222,24 @@ int amdgpu_userq_fence_create(struct amdgpu_usermode_queue *userq,
dma_fence_init(fence, &amdgpu_userq_fence_ops, &userq_fence->lock,
fence_drv->context, seq);
+ xa_init_flags(&userq_fence->fence_drv_xa, XA_FLAGS_ALLOC);
+
amdgpu_userq_fence_driver_get(fence_drv);
dma_fence_get(fence);
if (!xa_empty(&userq->fence_drv_xa)) {
struct amdgpu_userq_fence_driver *stored_fence_drv;
- unsigned long index, count = 0;
- int i = 0;
-
- xa_for_each(&userq->fence_drv_xa, index, stored_fence_drv)
- count++;
-
- userq_fence->fence_drv_array =
- kvmalloc_array(count,
- sizeof(struct amdgpu_userq_fence_driver *),
- GFP_KERNEL);
-
- if (userq_fence->fence_drv_array) {
- xa_for_each(&userq->fence_drv_xa, index, stored_fence_drv) {
- userq_fence->fence_drv_array[i] = stored_fence_drv;
- xa_erase(&userq->fence_drv_xa, index);
- i++;
- }
+ unsigned long index_uq;
+ u32 index_uf;
+ int err;
+
+ xa_for_each(&userq->fence_drv_xa, index_uq, stored_fence_drv) {
+ err = xa_alloc_irq(&userq_fence->fence_drv_xa, &index_uf,
+ stored_fence_drv, xa_limit_32b, GFP_KERNEL);
+ if (err)
+ return err;
}
-
- userq_fence->fence_drv_array_count = i;
- } else {
- userq_fence->fence_drv_array = NULL;
- userq_fence->fence_drv_array_count = 0;
+ xa_destroy(&userq->fence_drv_xa);
}
/* Check if hardware has already processed the job */
@@ -300,8 +291,6 @@ static void amdgpu_userq_fence_free(struct rcu_head *rcu)
/* Release the fence driver reference */
amdgpu_userq_fence_driver_put(fence_drv);
-
- kvfree(userq_fence->fence_drv_array);
kmem_cache_free(amdgpu_userq_fence_slab, userq_fence);
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.h
index f1a90840ac1f..3283e5573d10 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.h
@@ -37,9 +37,8 @@ struct amdgpu_userq_fence {
*/
spinlock_t lock;
struct list_head link;
- unsigned long fence_drv_array_count;
+ struct xarray fence_drv_xa;
struct amdgpu_userq_fence_driver *fence_drv;
- struct amdgpu_userq_fence_driver **fence_drv_array;
};
struct amdgpu_userq_fence_driver {
--
2.25.1
