--- /dev/null
+From 22207fd5c80177b860279653d017474b2812af5e Mon Sep 17 00:00:00 2001
+From: Vitaly Prosyak <vitaly.prosyak@amd.com>
+Date: Wed, 6 Mar 2024 14:57:48 -0500
+Subject: drm/amdgpu: fix use-after-free bug
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From: Vitaly Prosyak <vitaly.prosyak@amd.com>
+
+commit 22207fd5c80177b860279653d017474b2812af5e upstream.
+
+The bug can be triggered by sending a single amdgpu_gem_userptr_ioctl
+to the AMDGPU DRM driver on any ASICs with an invalid address and size.
+The bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>.
+For example the following code:
+
+static void Syzkaller1(int fd)
+{
+ struct drm_amdgpu_gem_userptr arg;
+ int ret;
+
+ arg.addr = 0xffffffffffff0000;
+ arg.size = 0x80000000; /*2 Gb*/
+ arg.flags = 0x7;
+ ret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg);
+}
+
+Due to the address and size are not valid there is a failure in
+amdgpu_hmm_register->mmu_interval_notifier_insert->__mmu_interval_notifier_insert->
+check_shl_overflow, but we even the amdgpu_hmm_register failure we still call
+amdgpu_hmm_unregister into amdgpu_gem_object_free which causes access to a bad address.
+The following stack is below when the issue is reproduced when Kazan is enabled:
+
+[ +0.000014] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020
+[ +0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340
+[ +0.000017] Code: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80
+[ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246
+[ +0.000013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b
+[ +0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8881a9f78260
+[ +0.000010] RBP: ffffc90002657a70 R08: 0000000000000001 R09: fffff520004caf25
+[ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00
+[ +0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260
+[ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:0000000000000000
+[ +0.000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+[ +0.000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0
+[ +0.000010] Call Trace:
+[ +0.000006] <TASK>
+[ +0.000007] ? show_regs+0x6a/0x80
+[ +0.000018] ? __warn+0xa5/0x1b0
+[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340
+[ +0.000018] ? report_bug+0x24a/0x290
+[ +0.000022] ? handle_bug+0x46/0x90
+[ +0.000015] ? exc_invalid_op+0x19/0x50
+[ +0.000016] ? asm_exc_invalid_op+0x1b/0x20
+[ +0.000017] ? kasan_save_stack+0x26/0x50
+[ +0.000017] ? mmu_interval_notifier_remove+0x23b/0x340
+[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340
+[ +0.000019] ? mmu_interval_notifier_remove+0x23b/0x340
+[ +0.000020] ? __pfx_mmu_interval_notifier_remove+0x10/0x10
+[ +0.000017] ? kasan_save_alloc_info+0x1e/0x30
+[ +0.000018] ? srso_return_thunk+0x5/0x5f
+[ +0.000014] ? __kasan_kmalloc+0xb1/0xc0
+[ +0.000018] ? srso_return_thunk+0x5/0x5f
+[ +0.000013] ? __kasan_check_read+0x11/0x20
+[ +0.000020] amdgpu_hmm_unregister+0x34/0x50 [amdgpu]
+[ +0.004695] amdgpu_gem_object_free+0x66/0xa0 [amdgpu]
+[ +0.004534] ? __pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu]
+[ +0.004291] ? do_syscall_64+0x5f/0xe0
+[ +0.000023] ? srso_return_thunk+0x5/0x5f
+[ +0.000017] drm_gem_object_free+0x3b/0x50 [drm]
+[ +0.000489] amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu]
+[ +0.004295] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]
+[ +0.004270] ? srso_return_thunk+0x5/0x5f
+[ +0.000014] ? __this_cpu_preempt_check+0x13/0x20
+[ +0.000015] ? srso_return_thunk+0x5/0x5f
+[ +0.000013] ? sysvec_apic_timer_interrupt+0x57/0xc0
+[ +0.000020] ? srso_return_thunk+0x5/0x5f
+[ +0.000014] ? asm_sysvec_apic_timer_interrupt+0x1b/0x20
+[ +0.000022] ? drm_ioctl_kernel+0x17b/0x1f0 [drm]
+[ +0.000496] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]
+[ +0.004272] ? drm_ioctl_kernel+0x190/0x1f0 [drm]
+[ +0.000492] drm_ioctl_kernel+0x140/0x1f0 [drm]
+[ +0.000497] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]
+[ +0.004297] ? __pfx_drm_ioctl_kernel+0x10/0x10 [drm]
+[ +0.000489] ? srso_return_thunk+0x5/0x5f
+[ +0.000011] ? __kasan_check_write+0x14/0x20
+[ +0.000016] drm_ioctl+0x3da/0x730 [drm]
+[ +0.000475] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]
+[ +0.004293] ? __pfx_drm_ioctl+0x10/0x10 [drm]
+[ +0.000506] ? __pfx_rpm_resume+0x10/0x10
+[ +0.000016] ? srso_return_thunk+0x5/0x5f
+[ +0.000011] ? __kasan_check_write+0x14/0x20
+[ +0.000010] ? srso_return_thunk+0x5/0x5f
+[ +0.000011] ? _raw_spin_lock_irqsave+0x99/0x100
+[ +0.000015] ? __pfx__raw_spin_lock_irqsave+0x10/0x10
+[ +0.000014] ? srso_return_thunk+0x5/0x5f
+[ +0.000013] ? srso_return_thunk+0x5/0x5f
+[ +0.000011] ? srso_return_thunk+0x5/0x5f
+[ +0.000011] ? preempt_count_sub+0x18/0xc0
+[ +0.000013] ? srso_return_thunk+0x5/0x5f
+[ +0.000010] ? _raw_spin_unlock_irqrestore+0x27/0x50
+[ +0.000019] amdgpu_drm_ioctl+0x7e/0xe0 [amdgpu]
+[ +0.004272] __x64_sys_ioctl+0xcd/0x110
+[ +0.000020] do_syscall_64+0x5f/0xe0
+[ +0.000021] entry_SYSCALL_64_after_hwframe+0x6e/0x76
+[ +0.000015] RIP: 0033:0x7ff9ed31a94f
+[ +0.000012] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 77 1f 48 8b 44 24 18 64 48 2b 04 25 28 00
+[ +0.000013] RSP: 002b:00007fff25f66790 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
+[ +0.000016] RAX: ffffffffffffffda RBX: 000055b3f7e133e0 RCX: 00007ff9ed31a94f
+[ +0.000012] RDX: 000055b3f7e133e0 RSI: 00000000c1186451 RDI: 0000000000000003
+[ +0.000010] RBP: 00000000c1186451 R08: 0000000000000000 R09: 0000000000000000
+[ +0.000009] R10: 0000000000000008 R11: 0000000000000246 R12: 00007fff25f66ca8
+[ +0.000009] R13: 0000000000000003 R14: 000055b3f7021ba8 R15: 00007ff9ed7af040
+[ +0.000024] </TASK>
+[ +0.000007] ---[ end trace 0000000000000000 ]---
+
+v2: Consolidate any error handling into amdgpu_hmm_register
+ which applied to kfd_bo also. (Christian)
+v3: Improve syntax and comment (Christian)
+
+Cc: Christian Koenig <christian.koenig@amd.com>
+Cc: Alex Deucher <alexander.deucher@amd.com>
+Cc: Felix Kuehling <felix.kuehling@amd.com>
+Cc: Joonkyo Jung <joonkyoj@yonsei.ac.kr>
+Cc: Dokyung Song <dokyungs@yonsei.ac.kr>
+Cc: <jisoo.jang@yonsei.ac.kr>
+Cc: <yw9865@yonsei.ac.kr>
+Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
+Reviewed-by: Christian König <christian.koenig@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c | 20 ++++++++++++++++----
+ 1 file changed, 16 insertions(+), 4 deletions(-)
+
+--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
+@@ -129,13 +129,25 @@ static const struct mmu_interval_notifie
+ */
+ int amdgpu_hmm_register(struct amdgpu_bo *bo, unsigned long addr)
+ {
++ int r;
++
+ if (bo->kfd_bo)
+- return mmu_interval_notifier_insert(&bo->notifier, current->mm,
++ r = mmu_interval_notifier_insert(&bo->notifier, current->mm,
+ addr, amdgpu_bo_size(bo),
+ &amdgpu_hmm_hsa_ops);
+- return mmu_interval_notifier_insert(&bo->notifier, current->mm, addr,
+- amdgpu_bo_size(bo),
+- &amdgpu_hmm_gfx_ops);
++ else
++ r = mmu_interval_notifier_insert(&bo->notifier, current->mm, addr,
++ amdgpu_bo_size(bo),
++ &amdgpu_hmm_gfx_ops);
++ if (r)
++ /*
++ * Make sure amdgpu_hmm_unregister() doesn't call
++ * mmu_interval_notifier_remove() when the notifier isn't properly
++ * initialized.
++ */
++ bo->notifier.mm = NULL;
++
++ return r;
+ }
+
+ /**
projects / thirdparty / kernel / stable-queue.git / commitdiff
