nouveau_uvmm_sm() calls op_map(), which passes bo->resource through
nouveau_mem() to nouveau_uvma_map(). nouveau_uvmm_vmm_map() then reads
mem->mem.type.
But this is only valid when bo->resource is backed by struct nouveau_mem,
as is the case for VRAM and TT resources. If the BO is left in
TTM_PL_SYSTEM, bo->resource is only a struct ttm_resource. Treating it
as struct nouveau_mem makes the mem->mem.type read past the end of the
resource, causing a KASAN: slab-use-after-free Read in nouveau_uvmm_sm
report:
BUG: KASAN: slab-use-after-free in nouveau_uvmm_vmm_map
drivers/gpu/drm/nouveau/nouveau_uvmm.c:152 [inline]
BUG: KASAN: slab-use-after-free in nouveau_uvma_map
drivers/gpu/drm/nouveau/nouveau_uvmm.c:199 [inline]
BUG: KASAN: slab-use-after-free in op_map
drivers/gpu/drm/nouveau/nouveau_uvmm.c:849 [inline]
BUG: KASAN: slab-use-after-free in nouveau_uvmm_sm.constprop.0+0x6ab/0x900
drivers/gpu/drm/nouveau/nouveau_uvmm.c:903
Read of size 1 at addr ffff888127d3e3a0 by task kworker/0:1/11
CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.2.0 #5 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2
04/01/2014
Workqueue: nouveau_sched_wq_2224 drm_sched_run_job_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x95/0xe0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcb/0x5a0 mm/kasan/report.c:482
kasan_report+0xca/0x100 mm/kasan/report.c:595
nouveau_uvmm_vmm_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:152 [inline]
nouveau_uvma_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:199 [inline]
op_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:849 [inline]
nouveau_uvmm_sm.constprop.0+0x6ab/0x900
drivers/gpu/drm/nouveau/nouveau_uvmm.c:903
nouveau_uvmm_sm_unmap drivers/gpu/drm/nouveau/nouveau_uvmm.c:932 [inline]
nouveau_uvmm_bind_job_run+0xd6/0x250
drivers/gpu/drm/nouveau/nouveau_uvmm.c:1532
nouveau_job_run drivers/gpu/drm/nouveau/nouveau_sched.c:350 [inline]
nouveau_sched_run_job+0x62/0xd0 drivers/gpu/drm/nouveau/nouveau_sched.c:364
drm_sched_run_job_work+0x356/0xa10 drivers/gpu/drm/scheduler/sched_main.c:1061
process_one_work+0x8a5/0x1900 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5dd/0xd80 kernel/workqueue.c:3486
kthread+0x31d/0x420 kernel/kthread.c:436
ret_from_fork+0x662/0x940 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 2224 on cpu 0 at 66.550027s:
kasan_save_stack+0x24/0x50 mm/kasan/common.c:57
kasan_save_track+0x17/0x60 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5334 [inline]
__kmalloc_noprof+0x304/0x7c0 mm/slub.c:5359
_kmalloc_noprof include/linux/slab.h:992 [inline]
dma_resv_list_alloc+0x27/0x90 drivers/dma-buf/dma-resv.c:106
dma_resv_reserve_fences+0x60e/0xa30 drivers/dma-buf/dma-resv.c:205
ttm_bo_alloc_resource+0x12c/0xbd0 drivers/gpu/drm/ttm/ttm_bo.c:721
ttm_bo_validate+0x1bc/0x4a0 drivers/gpu/drm/ttm/ttm_bo.c:856
ttm_bo_init_reserved+0x2c3/0x570 drivers/gpu/drm/ttm/ttm_bo.c:970
nouveau_bo_init+0x159/0x2c0 drivers/gpu/drm/nouveau/nouveau_bo.c:359
nouveau_gem_new+0x234/0x5f0 drivers/gpu/drm/nouveau/nouveau_gem.c:272
nouveau_gem_ioctl_new+0x1eb/0x420 drivers/gpu/drm/nouveau/nouveau_gem.c:352
drm_ioctl_kernel+0x192/0x350 drivers/gpu/drm/drm_ioctl.c:817
drm_ioctl+0x4f8/0xb40 drivers/gpu/drm/drm_ioctl.c:914
nouveau_drm_ioctl+0xea/0x2c0 drivers/gpu/drm/nouveau/nouveau_drm.c:1338
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x180/0x1d0 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x690 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 2223 on cpu 0 at 66.554063s:
kasan_save_stack+0x24/0x50 mm/kasan/common.c:57
kasan_save_track+0x17/0x60 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x61/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2677 [inline]
__rcu_free_sheaf_prepare+0xb6/0x2e0 mm/slub.c:2928
rcu_free_sheaf+0x1b/0x120 mm/slub.c:5978
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core+0x521/0x1490 kernel/rcu/tree.c:2897
handle_softirqs+0x1b1/0x8a0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x137/0x1c0 kernel/softirq.c:735
irq_exit_rcu+0x9/0x20 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x70/0x80 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
The buggy address belongs to the object at ffff888127d3e380
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 32 bytes inside of
freed 96-byte region [ffff888127d3e380, ffff888127d3e3e0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127d3e
flags: 0x200000000000000(node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000000 ffff888100041280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888127d3e280: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff888127d3e300: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
>ffff888127d3e380: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888127d3e400: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888127d3e480: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
Fix by resetting the placement to the BO's valid domains before
calling nouveau_bo_validate(), matching the handling in
nouveau_uvmm_bo_validate(), so map jobs do not run for SYSTEM resources;
Reject BO that cannot reside in VRAM or GART;
Also skip op_map() when the GPUVA has been invalidated, matching the
handling in the unmap and remap paths.
Found when fuzzing the nouveau driver with a modified Syzkaller.
Fixes: b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI")
Cc: [email protected]
Signed-off-by: Peiyang He <[email protected]>
Assisted-by: Codex:gpt-5.5
---
drivers/gpu/drm/nouveau/nouveau_uvmm.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
index fc125fd44a9b..2026fe6b48c6 100644
--- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
@@ -846,6 +846,9 @@ op_map(struct nouveau_uvma *uvma)
{
struct nouveau_bo *nvbo = nouveau_gem_object(uvma->va.gem.obj);
+ if (drm_gpuva_invalidated(&uvma->va))
+ return;
+
nouveau_uvma_map(uvma, nouveau_mem(nvbo->bo.resource));
}
@@ -1232,6 +1235,7 @@ bind_lock_validate(struct nouveau_job *job, struct
drm_exec *exec,
drm_gpuva_for_each_op(va_op, op->ops) {
struct drm_gem_object *obj = op_gem_obj(va_op);
+ struct nouveau_bo *nvbo;
if (unlikely(!obj))
continue;
@@ -1246,8 +1250,13 @@ bind_lock_validate(struct nouveau_job *job, struct
drm_exec *exec,
if (va_op->op == DRM_GPUVA_OP_UNMAP)
continue;
- ret = nouveau_bo_validate(nouveau_gem_object(obj),
- true, false);
+ nvbo = nouveau_gem_object(obj);
+ if (!(nvbo->valid_domains &
+ (NOUVEAU_GEM_DOMAIN_VRAM |
NOUVEAU_GEM_DOMAIN_GART)))
+ return -EINVAL;
+
+ nouveau_bo_placement_set(nvbo, nvbo->valid_domains, 0);
+ ret = nouveau_bo_validate(nvbo, true, false);
if (ret)
return ret;
}
}
