Re: [PATCH] drm/amdgpu: Fix use-after-free on amdgpu_bo_list mutex

[Melissa Wen]

On 08/15, Maíra Canal wrote:
> If amdgpu_cs_vm_handling returns r != 0, then it will unlock the
> bo_list_mutex inside the function amdgpu_cs_vm_handling and again on
> amdgpu_cs_parser_fini. This problem results in the following
> use-after-free problem:
> 
> [ 220.280990] ------------[ cut here ]------------
> [ 220.281000] refcount_t: underflow; use-after-free.
> [ 220.281019] WARNING: CPU: 1 PID: 3746 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x110
> [ 220.281029] ------------[ cut here ]------------
> [ 220.281415] CPU: 1 PID: 3746 Comm: chrome:cs0 Tainted: G W L ------- --- 5.20.0-0.rc0.20220812git7ebfc85e2cd7.10.fc38.x86_64 #1
> [ 220.281421] Hardware name: System manufacturer System Product Name/ROG STRIX X570-I GAMING, BIOS 4403 04/27/2022
> [ 220.281426] RIP: 0010:refcount_warn_saturate+0xba/0x110
> [ 220.281431] Code: 01 01 e8 79 4a 6f 00 0f 0b e9 42 47 a5 00 80 3d de
> 7e be 01 00 75 85 48 c7 c7 f8 98 8e 98 c6 05 ce 7e be 01 01 e8 56 4a
> 6f 00 <0f> 0b e9 1f 47 a5 00 80 3d b9 7e be 01 00 0f 85 5e ff ff ff 48
> c7
> [ 220.281437] RSP: 0018:ffffb4b0d18d7a80 EFLAGS: 00010282
> [ 220.281443] RAX: 0000000000000026 RBX: 0000000000000003 RCX: 0000000000000000
> [ 220.281448] RDX: 0000000000000001 RSI: ffffffff988d06dc RDI: 00000000ffffffff
> [ 220.281452] RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffb4b0d18d7930
> [ 220.281457] R10: 0000000000000003 R11: ffffa0672e2fffe8 R12: ffffa058ca360400
> [ 220.281461] R13: ffffa05846c50a18 R14: 00000000fffffe00 R15: 0000000000000003
> [ 220.281465] FS: 00007f82683e06c0(0000) GS:ffffa066e2e00000(0000) knlGS:0000000000000000
> [ 220.281470] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 220.281475] CR2: 00003590005cc000 CR3: 00000001fca46000 CR4: 0000000000350ee0
> [ 220.281480] Call Trace:
> [ 220.281485] <TASK>
> [ 220.281490] amdgpu_cs_ioctl+0x4e2/0x2070 [amdgpu]
> [ 220.281806] ? amdgpu_cs_find_mapping+0xe0/0xe0 [amdgpu]
> [ 220.282028] drm_ioctl_kernel+0xa4/0x150
> [ 220.282043] drm_ioctl+0x21f/0x420
> [ 220.282053] ? amdgpu_cs_find_mapping+0xe0/0xe0 [amdgpu]
> [ 220.282275] ? lock_release+0x14f/0x460
> [ 220.282282] ? _raw_spin_unlock_irqrestore+0x30/0x60
> [ 220.282290] ? _raw_spin_unlock_irqrestore+0x30/0x60
> [ 220.282297] ? lockdep_hardirqs_on+0x7d/0x100
> [ 220.282305] ? _raw_spin_unlock_irqrestore+0x40/0x60
> [ 220.282317] amdgpu_drm_ioctl+0x4a/0x80 [amdgpu]
> [ 220.282534] __x64_sys_ioctl+0x90/0xd0
> [ 220.282545] do_syscall_64+0x5b/0x80
> [ 220.282551] ? futex_wake+0x6c/0x150
> [ 220.282568] ? lock_is_held_type+0xe8/0x140
> [ 220.282580] ? do_syscall_64+0x67/0x80
> [ 220.282585] ? lockdep_hardirqs_on+0x7d/0x100
> [ 220.282592] ? do_syscall_64+0x67/0x80
> [ 220.282597] ? do_syscall_64+0x67/0x80
> [ 220.282602] ? lockdep_hardirqs_on+0x7d/0x100
> [ 220.282609] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> [ 220.282616] RIP: 0033:0x7f8282a4f8bf
> [ 220.282639] 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 <89> c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00
> 00
> [ 220.282644] RSP: 002b:00007f82683df410 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> [ 220.282651] RAX: ffffffffffffffda RBX: 00007f82683df588 RCX: 00007f8282a4f8bf
> [ 220.282655] RDX: 00007f82683df4d0 RSI: 00000000c0186444 RDI: 0000000000000018
> [ 220.282659] RBP: 00007f82683df4d0 R08: 00007f82683df5e0 R09: 00007f82683df4b0
> [ 220.282663] R10: 00001d04000a0600 R11: 0000000000000246 R12: 00000000c0186444
> [ 220.282667] R13: 0000000000000018 R14: 00007f82683df588 R15: 0000000000000003
> [ 220.282689] </TASK>
> [ 220.282693] irq event stamp: 6232311
> [ 220.282697] hardirqs last enabled at (6232319): [<ffffffff9718cd7e>] __up_console_sem+0x5e/0x70
> [ 220.282704] hardirqs last disabled at (6232326): [<ffffffff9718cd63>] __up_console_sem+0x43/0x70
> [ 220.282709] softirqs last enabled at (6232072): [<ffffffff970ff669>] __irq_exit_rcu+0xf9/0x170
> [ 220.282716] softirqs last disabled at (6232061): [<ffffffff970ff669>] __irq_exit_rcu+0xf9/0x170
> [ 220.282722] ---[ end trace 0000000000000000 ]---
> 
> Therefore, remove the mutex_unlock from the amdgpu_cs_vm_handling
> function, so that amdgpu_cs_submit and amdgpu_cs_parser_fini can handle
> the unlock.
> 
> Fixes: 90af0ca047f3 ("drm/amdgpu: Protect the amdgpu_bo_list list with a mutex v2")
> Reported-by: Mikhail Gavrilov <mikhail.v.gavrilov@xxxxxxxxx>
> Signed-off-by: Maíra Canal <mairacanal@xxxxxxxxxx>
> ---
> Thanks Melissa and Christian for the feedback on mutex_unlock.
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index d8f1335bc68f..b7bae833c804 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -837,16 +837,12 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
>  			continue;
>  
>  		r = amdgpu_vm_bo_update(adev, bo_va, false);
> -		if (r) {
> -			mutex_unlock(&p->bo_list->bo_list_mutex);
> +		if (r)
>  			return r;
> -		}
>  
>  		r = amdgpu_sync_fence(&p->job->sync, bo_va->last_pt_update);
> -		if (r) {
> -			mutex_unlock(&p->bo_list->bo_list_mutex);
> +		if (r)
>  			return r;
> -		}
Nice catch, Maíra!

Reviewed-by: Melissa Wen <mwen@xxxxxxxxxx>

>  	}
>  
>  	r = amdgpu_vm_handle_moved(adev, vm);
> -- 
> 2.37.2
>

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