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From: Liam Merwick <liam.merwick@oracle.com>
To: Kim Phillips <kim.phillips@amd.com>, Ashish Kalra <ashish.kalra@amd.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        John Allen <john.allen@amd.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller"
	<davem@davemloft.net>
CC: Mario Limonciello <mario.limonciello@amd.com>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH] crypto: ccp - Fix null pointer dereference in
 __sev_snp_shutdown_locked
Thread-Topic: [PATCH] crypto: ccp - Fix null pointer dereference in
 __sev_snp_shutdown_locked
Thread-Index: AQHatciECq3jCs/qE0un7SwS5Rr94rG2xhUA
Date: Mon, 3 Jun 2024 23:48:56 +0000
Message-ID: <fa41f7b4-a7b8-4515-b267-703fa34162b6@oracle.com>
References: <20240603151212.18342-1-kim.phillips@amd.com>
In-Reply-To: <20240603151212.18342-1-kim.phillips@amd.com>
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On 03/06/2024 16:12, Kim Phillips wrote:=0A=
> Another DEBUG_TEST_DRIVER_REMOVE induced splat found, this time=0A=
> in __sev_snp_shutdown_locked().=0A=
> =0A=
> [   38.625613] ccp 0000:55:00.5: enabling device (0000 -> 0002)=0A=
> [   38.633022] ccp 0000:55:00.5: sev enabled=0A=
> [   38.637498] ccp 0000:55:00.5: psp enabled=0A=
> [   38.642011] BUG: kernel NULL pointer dereference, address: 00000000000=
000f0=0A=
> [   38.645963] #PF: supervisor read access in kernel mode=0A=
> [   38.645963] #PF: error_code(0x0000) - not-present page=0A=
> [   38.645963] PGD 0 P4D 0=0A=
> [   38.645963] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC NOPTI=0A=
> [   38.645963] CPU: 262 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1+ #29=
=0A=
> [   38.645963] RIP: 0010:__sev_snp_shutdown_locked+0x2e/0x150=0A=
> [   38.645963] Code: 00 55 48 89 e5 41 57 41 56 41 54 53 48 83 ec 10 41 8=
9 f7 49 89 fe 65 48 8b 04 25 28 00 00 00 48 89 45 d8 48 8b 05 6a 5a 7f 06 <=
4c> 8b a0 f0 00 00 00 41 0f b6 9c 24 a2 00 00 00 48 83 fb 02 0f 83=0A=
> [   38.645963] RSP: 0018:ffffb2ea4014b7b8 EFLAGS: 00010286=0A=
> [   38.645963] RAX: 0000000000000000 RBX: ffff9e4acd2e0a28 RCX: 000000000=
0000000=0A=
> [   38.645963] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb2ea4=
014b808=0A=
> [   38.645963] RBP: ffffb2ea4014b7e8 R08: 0000000000000106 R09: 000000000=
003d9c0=0A=
> [   38.645963] R10: 0000000000000001 R11: ffffffffa39ff070 R12: ffff9e49d=
40590c8=0A=
> [   38.645963] R13: 0000000000000000 R14: ffffb2ea4014b808 R15: 000000000=
0000000=0A=
> [   38.645963] FS:  0000000000000000(0000) GS:ffff9e58b1e00000(0000) knlG=
S:0000000000000000=0A=
> [   38.645963] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033=0A=
> [   38.645963] CR2: 00000000000000f0 CR3: 0000000418a3e001 CR4: 000000000=
0770ef0=0A=
> [   38.645963] PKRU: 55555554=0A=
> [   38.645963] Call Trace:=0A=
> [   38.645963]  <TASK>=0A=
> [   38.645963]  ? __die_body+0x6f/0xb0=0A=
> [   38.645963]  ? __die+0xcc/0xf0=0A=
> [   38.645963]  ? page_fault_oops+0x330/0x3a0=0A=
> [   38.645963]  ? save_trace+0x2a5/0x360=0A=
> [   38.645963]  ? do_user_addr_fault+0x583/0x630=0A=
> [   38.645963]  ? exc_page_fault+0x81/0x120=0A=
> [   38.645963]  ? asm_exc_page_fault+0x2b/0x30=0A=
> [   38.645963]  ? __sev_snp_shutdown_locked+0x2e/0x150=0A=
> [   38.645963]  __sev_firmware_shutdown+0x349/0x5b0=0A=
> [   38.645963]  ? pm_runtime_barrier+0x66/0xe0=0A=
> [   38.645963]  sev_dev_destroy+0x34/0xb0=0A=
> [   38.645963]  psp_dev_destroy+0x27/0x60=0A=
> [   38.645963]  sp_destroy+0x39/0x90=0A=
> [   38.645963]  sp_pci_remove+0x22/0x60=0A=
> [   38.645963]  pci_device_remove+0x4e/0x110=0A=
> [   38.645963]  really_probe+0x271/0x4e0=0A=
> [   38.645963]  __driver_probe_device+0x8f/0x160=0A=
> [   38.645963]  driver_probe_device+0x24/0x120=0A=
> [   38.645963]  __driver_attach+0xc7/0x280=0A=
> [   38.645963]  ? driver_attach+0x30/0x30=0A=
> [   38.645963]  bus_for_each_dev+0x10d/0x130=0A=
> [   38.645963]  driver_attach+0x22/0x30=0A=
> [   38.645963]  bus_add_driver+0x171/0x2b0=0A=
> [   38.645963]  ? unaccepted_memory_init_kdump+0x20/0x20=0A=
> [   38.645963]  driver_register+0x67/0x100=0A=
> [   38.645963]  __pci_register_driver+0x83/0x90=0A=
> [   38.645963]  sp_pci_init+0x22/0x30=0A=
> [   38.645963]  sp_mod_init+0x13/0x30=0A=
> [   38.645963]  do_one_initcall+0xb8/0x290=0A=
> [   38.645963]  ? sched_clock_noinstr+0xd/0x10=0A=
> [   38.645963]  ? local_clock_noinstr+0x3e/0x100=0A=
> [   38.645963]  ? stack_depot_save_flags+0x21e/0x6a0=0A=
> [   38.645963]  ? local_clock+0x1c/0x60=0A=
> [   38.645963]  ? stack_depot_save_flags+0x21e/0x6a0=0A=
> [   38.645963]  ? sched_clock_noinstr+0xd/0x10=0A=
> [   38.645963]  ? local_clock_noinstr+0x3e/0x100=0A=
> [   38.645963]  ? __lock_acquire+0xd90/0xe30=0A=
> [   38.645963]  ? sched_clock_noinstr+0xd/0x10=0A=
> [   38.645963]  ? local_clock_noinstr+0x3e/0x100=0A=
> [   38.645963]  ? __create_object+0x66/0x100=0A=
> [   38.645963]  ? local_clock+0x1c/0x60=0A=
> [   38.645963]  ? __create_object+0x66/0x100=0A=
> [   38.645963]  ? parameq+0x1b/0x90=0A=
> [   38.645963]  ? parse_one+0x6d/0x1d0=0A=
> [   38.645963]  ? parse_args+0xd7/0x1f0=0A=
> [   38.645963]  ? do_initcall_level+0x180/0x180=0A=
> [   38.645963]  do_initcall_level+0xb0/0x180=0A=
> [   38.645963]  do_initcalls+0x60/0xa0=0A=
> [   38.645963]  ? kernel_init+0x1f/0x1d0=0A=
> [   38.645963]  do_basic_setup+0x41/0x50=0A=
> [   38.645963]  kernel_init_freeable+0x1ac/0x230=0A=
> [   38.645963]  ? rest_init+0x1f0/0x1f0=0A=
> [   38.645963]  kernel_init+0x1f/0x1d0=0A=
> [   38.645963]  ? rest_init+0x1f0/0x1f0=0A=
> [   38.645963]  ret_from_fork+0x3d/0x50=0A=
> [   38.645963]  ? rest_init+0x1f0/0x1f0=0A=
> [   38.645963]  ret_from_fork_asm+0x11/0x20=0A=
> [   38.645963]  </TASK>=0A=
> [   38.645963] Modules linked in:=0A=
> [   38.645963] CR2: 00000000000000f0=0A=
> [   38.645963] ---[ end trace 0000000000000000 ]---=0A=
> [   38.645963] RIP: 0010:__sev_snp_shutdown_locked+0x2e/0x150=0A=
> [   38.645963] Code: 00 55 48 89 e5 41 57 41 56 41 54 53 48 83 ec 10 41 8=
9 f7 49 89 fe 65 48 8b 04 25 28 00 00 00 48 89 45 d8 48 8b 05 6a 5a 7f 06 <=
4c> 8b a0 f0 00 00 00 41 0f b6 9c 24 a2 00 00 00 48 83 fb 02 0f 83=0A=
> [   38.645963] RSP: 0018:ffffb2ea4014b7b8 EFLAGS: 00010286=0A=
> [   38.645963] RAX: 0000000000000000 RBX: ffff9e4acd2e0a28 RCX: 000000000=
0000000=0A=
> [   38.645963] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb2ea4=
014b808=0A=
> [   38.645963] RBP: ffffb2ea4014b7e8 R08: 0000000000000106 R09: 000000000=
003d9c0=0A=
> [   38.645963] R10: 0000000000000001 R11: ffffffffa39ff070 R12: ffff9e49d=
40590c8=0A=
> [   38.645963] R13: 0000000000000000 R14: ffffb2ea4014b808 R15: 000000000=
0000000=0A=
> [   38.645963] FS:  0000000000000000(0000) GS:ffff9e58b1e00000(0000) knlG=
S:0000000000000000=0A=
> [   38.645963] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033=0A=
> [   38.645963] CR2: 00000000000000f0 CR3: 0000000418a3e001 CR4: 000000000=
0770ef0=0A=
> [   38.645963] PKRU: 55555554=0A=
> [   38.645963] Kernel panic - not syncing: Fatal exception=0A=
> [   38.645963] Kernel Offset: 0x1fc00000 from 0xffffffff81000000 (relocat=
ion range: 0xffffffff80000000-0xffffffffbfffffff)=0A=
> =0A=
> Fixes: ccb88e9549e7 ("crypto: ccp - Fix null pointer dereference in __sev=
_platform_shutdown_locked")=0A=
> Cc: stable@vger.kernel.org=0A=
> Signed-off-by: Kim Phillips <kim.phillips@amd.com>=0A=
=0A=
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>=0A=
=0A=
=0A=
> ---=0A=
>   drivers/crypto/ccp/sev-dev.c | 8 +++++++-=0A=
>   1 file changed, 7 insertions(+), 1 deletion(-)=0A=
> =0A=
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c=
=0A=
> index 2102377f727b..1912bee22dd4 100644=0A=
> --- a/drivers/crypto/ccp/sev-dev.c=0A=
> +++ b/drivers/crypto/ccp/sev-dev.c=0A=
> @@ -1642,10 +1642,16 @@ static int sev_update_firmware(struct device *dev=
)=0A=
>   =0A=
>   static int __sev_snp_shutdown_locked(int *error, bool panic)=0A=
>   {=0A=
> -	struct sev_device *sev =3D psp_master->sev_data;=0A=
> +	struct psp_device *psp =3D psp_master;=0A=
> +	struct sev_device *sev;=0A=
>   	struct sev_data_snp_shutdown_ex data;=0A=
>   	int ret;=0A=
>   =0A=
> +	if (!psp || !psp->sev_data)=0A=
> +		return 0;=0A=
> +=0A=
> +	sev =3D psp->sev_data;=0A=
> +=0A=
>   	if (!sev->snp_initialized)=0A=
>   		return 0;=0A=
>   =0A=
=0A=