From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4CCF33382C7; Sat, 17 Oct 2026 16:54:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792256099; cv=none; b=V5+dnMCvTc693vEGTBf6yEfVSXfh3/GKgLfaUmIUdXILFVnkbJ9qeEwa5MMGMYMt7sITf77Qbr/5MLuB9BSemlZFkHBAsm9IV7B2Sf7uHn9fXIXVLk1ZwrnYdo8TZDyISCl0yTs6VOgR162kbLkRTH0jrgLgzHzMd+ualdPoXFk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792256099; c=relaxed/simple; bh=ry0FN0v33/dGd9xD/M1H2qfpd2VorPlZZiJi5Fns5nQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qrUTz7nyApVpNP6vIlhpQnTovBAqd0lM+HY/3D9g8uIGoBhz6oYJZzDUvaZ1Rl+/lEBiYX1VftQYi3v9PJmdMjEgdcq5FpT+S5yT32SxdAJTGoKdHaT1BcfPvvsrM49wacHUo9YBugnjSolivsVHCtECgVuaF5Zq0Cv/aqaiTVI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QaNfI+i1; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QaNfI+i1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9BFA21F000C4; Sat, 17 Oct 2026 16:54:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792256098; bh=HUJrpDawEb3uIc93w0LmSV+IUYNkW9ijGEU+yINZHMo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QaNfI+i1t9xMXYayMRrEueXl9JGQ7mbl8KZxwl30pnaouuiiu35hk8uKVtYI5qHLe HQWo/mgsHQrapdhb7dJRno4/T2kIBcupfNAFF7UdZbwIDpnUiD2Fu1ISqFovE9dtCF SqnGR4EvhTrXcFEDK8aTCh+nApRA7Rs9YA5rgYnE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Peiyang He , Lyude Paul , Sasha Levin Subject: [PATCH 6.6 0125/1674] drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM Date: Sat, 17 Oct 2026 17:39:57 +0200 Message-ID: <20261017160434.364560590@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261017160431.119607952@linuxfoundation.org> References: <20261017160431.119607952@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peiyang He [ Upstream commit 3359a372efb6d585c97019ee1b7f1874442bcebe ] 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: __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 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: stable@vger.kernel.org Signed-off-by: Peiyang He Assisted-by: Codex:gpt-5.5 Reviewed-by: Lyude Paul Signed-off-by: Lyude Paul Link: https://patch.msgid.link/0D77BEC410CE0129+20260907052204.1431488-1-peiyang_he@smail.nju.edu.cn [ adapted bind_lock_validate() changes to nouveau_uvmm_bind_job_submit() using its existing unwind path. ] Signed-off-by: Sasha Levin --- drivers/gpu/drm/nouveau/nouveau_uvmm.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c b/drivers/gpu/drm/nouveau/nouveau_uvmm.c index 1310ee5f4973f..a56d6adf42958 100644 --- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c +++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c @@ -772,6 +772,9 @@ 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)); } @@ -1334,6 +1337,13 @@ nouveau_uvmm_bind_job_submit(struct nouveau_job *job) continue; nvbo = nouveau_gem_object(obj); + if (!(nvbo->valid_domains & + (NOUVEAU_GEM_DOMAIN_VRAM | NOUVEAU_GEM_DOMAIN_GART))) { + ret = -EINVAL; + op = list_last_op(&bind_job->ops); + goto unwind; + } + nouveau_bo_placement_set(nvbo, nvbo->valid_domains, 0); ret = nouveau_bo_validate(nvbo, true, false); if (ret) { -- 2.53.0