• John Garry's avatar
    libata: Ensure ata_port probe has completed before detach · 130f4caf
    John Garry authored
    With CONFIG_DEBUG_TEST_DRIVER_REMOVE set, we may find the following WARN:
    
    [   23.452574] ------------[ cut here ]------------
    [   23.457190] WARNING: CPU: 59 PID: 1 at drivers/ata/libata-core.c:6676 ata_host_detach+0x15c/0x168
    [   23.466047] Modules linked in:
    [   23.469092] CPU: 59 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc1-00010-g5b83fd27752b-dirty #296
    [   23.477776] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - V1.16.01 03/15/2019
    [   23.486286] pstate: a0c00009 (NzCv daif +PAN +UAO)
    [   23.491065] pc : ata_host_detach+0x15c/0x168
    [   23.495322] lr : ata_host_detach+0x88/0x168
    [   23.499491] sp : ffff800011cabb50
    [   23.502792] x29: ffff800011cabb50 x28: 0000000000000007
    [   23.508091] x27: ffff80001137f068 x26: ffff8000112c0c28
    [   23.513390] x25: 0000000000003848 x24: ffff0023ea185300
    [   23.518689] x23: 0000000000000001 x22: 00000000000014c0
    [   23.523987] x21: 0000000000013740 x20: ffff0023bdc20000
    [   23.529286] x19: 0000000000000000 x18: 0000000000000004
    [   23.534584] x17: 0000000000000001 x16: 00000000000000f0
    [   23.539883] x15: ffff0023eac13790 x14: ffff0023eb76c408
    [   23.545181] x13: 0000000000000000 x12: ffff0023eac13790
    [   23.550480] x11: ffff0023eb76c228 x10: 0000000000000000
    [   23.555779] x9 : ffff0023eac13798 x8 : 0000000040000000
    [   23.561077] x7 : 0000000000000002 x6 : 0000000000000001
    [   23.566376] x5 : 0000000000000002 x4 : 0000000000000000
    [   23.571674] x3 : ffff0023bf08a0bc x2 : 0000000000000000
    [   23.576972] x1 : 3099674201f72700 x0 : 0000000000400284
    [   23.582272] Call trace:
    [   23.584706]  ata_host_detach+0x15c/0x168
    [   23.588616]  ata_pci_remove_one+0x10/0x18
    [   23.592615]  ahci_remove_one+0x20/0x40
    [   23.596356]  pci_device_remove+0x3c/0xe0
    [   23.600267]  really_probe+0xdc/0x3e0
    [   23.603830]  driver_probe_device+0x58/0x100
    [   23.608000]  device_driver_attach+0x6c/0x90
    [   23.612169]  __driver_attach+0x84/0xc8
    [   23.615908]  bus_for_each_dev+0x74/0xc8
    [   23.619730]  driver_attach+0x20/0x28
    [   23.623292]  bus_add_driver+0x148/0x1f0
    [   23.627115]  driver_register+0x60/0x110
    [   23.630938]  __pci_register_driver+0x40/0x48
    [   23.635199]  ahci_pci_driver_init+0x20/0x28
    [   23.639372]  do_one_initcall+0x5c/0x1b0
    [   23.643199]  kernel_init_freeable+0x1a4/0x24c
    [   23.647546]  kernel_init+0x10/0x108
    [   23.651023]  ret_from_fork+0x10/0x18
    [   23.654590] ---[ end trace 634a14b675b71c13 ]---
    
    With KASAN also enabled, we may also get many use-after-free reports.
    
    The issue is that when CONFIG_DEBUG_TEST_DRIVER_REMOVE is set, we may
    attempt to detach the ata_port before it has been probed.
    
    This is because the ata_ports are async probed, meaning that there is no
    guarantee that the ata_port has probed prior to detach. When the ata_port
    does probe in this scenario, we get all sorts of issues as the detach may
    have already happened.
    
    Fix by ensuring synchronisation with async_synchronize_full(). We could
    alternatively use the cookie returned from the ata_port probe
    async_schedule() call, but that means managing the cookie, so more
    complicated.
    Signed-off-by: default avatarJohn Garry <john.garry@huawei.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    130f4caf
libata-core.c 190 KB