On Thu, Jan 25, 2024 at 05:12:53PM -0600, Kim Phillips wrote:
> The SEV platform device can be shutdown with a null psp_master,
> e.g., using DEBUG_TEST_DRIVER_REMOVE. Found using KASAN:
>
> [ 137.148210] ccp 0000:23:00.1: enabling device (0000 -> 0002)
> [ 137.162647] ccp 0000:23:00.1: no command queues available
> [ 137.170598] ccp 0000:23:00.1: sev enabled
> [ 137.174645] ccp 0000:23:00.1: psp enabled
> [ 137.178890] general protection fault, probably for non-canonical address 0xdffffc000000001e: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN NOPTI
> [ 137.182693] KASAN: null-ptr-deref in range [0x00000000000000f0-0x00000000000000f7]
> [ 137.182693] CPU: 93 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc1+ #311
> [ 137.182693] RIP: 0010:__sev_platform_shutdown_locked+0x51/0x180
> [ 137.182693] Code: 08 80 3c 08 00 0f 85 0e 01 00 00 48 8b 1d 67 b6 01 08 48 b8 00 00 00 00 00 fc ff df 48 8d bb f0 00 00 00 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 fe 00 00 00 48 8b 9b f0 00 00 00 48 85 db 74 2c
> [ 137.182693] RSP: 0018:ffffc900000cf9b0 EFLAGS: 00010216
> [ 137.182693] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 000000000000001e
> [ 137.182693] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000000000f0
> [ 137.182693] RBP: ffffc900000cf9c8 R08: 0000000000000000 R09: fffffbfff58f5a66
> [ 137.182693] R10: ffffc900000cf9c8 R11: ffffffffac7ad32f R12: ffff8881e5052c28
> [ 137.182693] R13: ffff8881e5052c28 R14: ffff8881758e43e8 R15: ffffffffac64abf8
> [ 137.182693] FS: 0000000000000000(0000) GS:ffff889de7000000(0000) knlGS:0000000000000000
> [ 137.182693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 137.182693] CR2: 0000000000000000 CR3: 0000001cf7c7e000 CR4: 0000000000350ef0
> [ 137.182693] Call Trace:
> [ 137.182693] <TASK>
> [ 137.182693] ? show_regs+0x6c/0x80
> [ 137.182693] ? __die_body+0x24/0x70
> [ 137.182693] ? die_addr+0x4b/0x80
> [ 137.182693] ? exc_general_protection+0x126/0x230
> [ 137.182693] ? asm_exc_general_protection+0x2b/0x30
> [ 137.182693] ? __sev_platform_shutdown_locked+0x51/0x180
> [ 137.182693] sev_firmware_shutdown.isra.0+0x1e/0x80
> [ 137.182693] sev_dev_destroy+0x49/0x100
> [ 137.182693] psp_dev_destroy+0x47/0xb0
> [ 137.182693] sp_destroy+0xbb/0x240
> [ 137.182693] sp_pci_remove+0x45/0x60
> [ 137.182693] pci_device_remove+0xaa/0x1d0
> [ 137.182693] device_remove+0xc7/0x170
> [ 137.182693] really_probe+0x374/0xbe0
> [ 137.182693] ? srso_return_thunk+0x5/0x5f
> [ 137.182693] __driver_probe_device+0x199/0x460
> [ 137.182693] driver_probe_device+0x4e/0xd0
> [ 137.182693] __driver_attach+0x191/0x3d0
> [ 137.182693] ? __pfx___driver_attach+0x10/0x10
> [ 137.182693] bus_for_each_dev+0x100/0x190
> [ 137.182693] ? __pfx_bus_for_each_dev+0x10/0x10
> [ 137.182693] ? __kasan_check_read+0x15/0x20
> [ 137.182693] ? srso_return_thunk+0x5/0x5f
> [ 137.182693] ? _raw_spin_unlock+0x27/0x50
> [ 137.182693] driver_attach+0x41/0x60
> [ 137.182693] bus_add_driver+0x2a8/0x580
> [ 137.182693] driver_register+0x141/0x480
> [ 137.182693] __pci_register_driver+0x1d6/0x2a0
> [ 137.182693] ? srso_return_thunk+0x5/0x5f
> [ 137.182693] ? esrt_sysfs_init+0x1cd/0x5d0
> [ 137.182693] ? __pfx_sp_mod_init+0x10/0x10
> [ 137.182693] sp_pci_init+0x22/0x30
> [ 137.182693] sp_mod_init+0x14/0x30
> [ 137.182693] ? __pfx_sp_mod_init+0x10/0x10
> [ 137.182693] do_one_initcall+0xd1/0x470
> [ 137.182693] ? __pfx_do_one_initcall+0x10/0x10
> [ 137.182693] ? parameq+0x80/0xf0
> [ 137.182693] ? srso_return_thunk+0x5/0x5f
> [ 137.182693] ? __kmalloc+0x3b0/0x4e0
> [ 137.182693] ? kernel_init_freeable+0x92d/0x1050
> [ 137.182693] ? kasan_populate_vmalloc_pte+0x171/0x190
> [ 137.182693] ? srso_return_thunk+0x5/0x5f
> [ 137.182693] kernel_init_freeable+0xa64/0x1050
> [ 137.182693] ? __pfx_kernel_init+0x10/0x10
> [ 137.182693] kernel_init+0x24/0x160
> [ 137.182693] ? __switch_to_asm+0x3e/0x70
> [ 137.182693] ret_from_fork+0x40/0x80
> [ 137.182693] ? __pfx_kernel_init+0x10/0x10
> [ 137.182693] ret_from_fork_asm+0x1b/0x30
> [ 137.182693] </TASK>
> [ 137.182693] Modules linked in:
> [ 137.538483] ---[ end trace 0000000000000000 ]---
>
> Fixes: 1b05ece0c9315 ("crypto: ccp - During shutdown, check SEV data pointer before using")
> Cc: [email protected]
> Reviewed-by: Mario Limonciello <[email protected]>
> Signed-off-by: Kim Phillips <[email protected]>
Acked-by: John Allen <[email protected]>