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56a0b978d4
When enabling KASAN and DEBUG_TEST_DRIVER_REMOVE, I find this KASAN
warning:
[ 20.872057] BUG: KASAN: use-after-free in pcc_data_alloc+0x40/0xb8
[ 20.878226] Read of size 4 at addr ffff00236cdeb684 by task swapper/0/1
[ 20.884826]
[ 20.886309] CPU: 19 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc1-00009-ge7f7df3db5bf-dirty #289
[ 20.894994] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - V1.16.01 03/15/2019
[ 20.903505] Call trace:
[ 20.905942] dump_backtrace+0x0/0x200
[ 20.909593] show_stack+0x14/0x20
[ 20.912899] dump_stack+0xd4/0x130
[ 20.916291] print_address_description.isra.9+0x6c/0x3b8
[ 20.921592] __kasan_report+0x12c/0x23c
[ 20.925417] kasan_report+0xc/0x18
[ 20.928808] __asan_load4+0x94/0xb8
[ 20.932286] pcc_data_alloc+0x40/0xb8
[ 20.935938] acpi_cppc_processor_probe+0x4e8/0xb08
[ 20.940717] __acpi_processor_start+0x48/0xb0
[ 20.945062] acpi_processor_start+0x40/0x60
[ 20.949235] really_probe+0x118/0x548
[ 20.952887] driver_probe_device+0x7c/0x148
[ 20.957059] device_driver_attach+0x94/0xa0
[ 20.961231] __driver_attach+0xa4/0x110
[ 20.965055] bus_for_each_dev+0xe8/0x158
[ 20.968966] driver_attach+0x30/0x40
[ 20.972531] bus_add_driver+0x234/0x2f0
[ 20.976356] driver_register+0xbc/0x1d0
[ 20.980182] acpi_processor_driver_init+0x40/0xe4
[ 20.984875] do_one_initcall+0xb4/0x254
[ 20.988700] kernel_init_freeable+0x24c/0x2f8
[ 20.993047] kernel_init+0x10/0x118
[ 20.996524] ret_from_fork+0x10/0x18
[ 21.000087]
[ 21.001567] Allocated by task 1:
[ 21.004785] save_stack+0x28/0xc8
[ 21.008089] __kasan_kmalloc.isra.9+0xbc/0xd8
[ 21.012435] kasan_kmalloc+0xc/0x18
[ 21.015913] pcc_data_alloc+0x94/0xb8
[ 21.019564] acpi_cppc_processor_probe+0x4e8/0xb08
[ 21.024343] __acpi_processor_start+0x48/0xb0
[ 21.028689] acpi_processor_start+0x40/0x60
[ 21.032860] really_probe+0x118/0x548
[ 21.036512] driver_probe_device+0x7c/0x148
[ 21.040684] device_driver_attach+0x94/0xa0
[ 21.044855] __driver_attach+0xa4/0x110
[ 21.048680] bus_for_each_dev+0xe8/0x158
[ 21.052591] driver_attach+0x30/0x40
[ 21.056155] bus_add_driver+0x234/0x2f0
[ 21.059980] driver_register+0xbc/0x1d0
[ 21.063805] acpi_processor_driver_init+0x40/0xe4
[ 21.068497] do_one_initcall+0xb4/0x254
[ 21.072322] kernel_init_freeable+0x24c/0x2f8
[ 21.076667] kernel_init+0x10/0x118
[ 21.080144] ret_from_fork+0x10/0x18
[ 21.083707]
[ 21.085186] Freed by task 1:
[ 21.088056] save_stack+0x28/0xc8
[ 21.091360] __kasan_slab_free+0x118/0x180
[ 21.095445] kasan_slab_free+0x10/0x18
[ 21.099183] kfree+0x80/0x268
[ 21.102139] acpi_cppc_processor_exit+0x1a8/0x1b8
[ 21.106832] acpi_processor_stop+0x70/0x80
[ 21.110917] really_probe+0x174/0x548
[ 21.114568] driver_probe_device+0x7c/0x148
[ 21.118740] device_driver_attach+0x94/0xa0
[ 21.122912] __driver_attach+0xa4/0x110
[ 21.126736] bus_for_each_dev+0xe8/0x158
[ 21.130648] driver_attach+0x30/0x40
[ 21.134212] bus_add_driver+0x234/0x2f0
[ 21.0x10/0x18
[ 21.161764]
[ 21.163244] The buggy address belongs to the object at ffff00236cdeb600
[ 21.163244] which belongs to the cache kmalloc-256 of size 256
[ 21.175750] The buggy address is located 132 bytes inside of
[ 21.175750] 256-byte region [ffff00236cdeb600, ffff00236cdeb700)
[ 21.187473] The buggy address belongs to the page:
[ 21.192254] page:fffffe008d937a00 refcount:1 mapcount:0 mapping:ffff002370c0fa00 index:0x0 compound_mapcount: 0
[ 21.202331] flags: 0x1ffff00000010200(slab|head)
[ 21.206940] raw: 1ffff00000010200 dead000000000100 dead000000000122 ffff002370c0fa00
[ 21.214671] raw: 0000000000000000 00000000802a002a 00000001ffffffff 0000000000000000
[ 21.222400] page dumped because: kasan: bad access detected
[ 21.227959]
[ 21.229438] Memory state around the buggy address:
[ 21.234218] ffff00236cdeb580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 21.241427] ffff00236cdeb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.248637] >ffff00236cdeb680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.255845] ^
[ 21.259062] ffff00236cdeb700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 21.266272] ffff00236cdeb780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.273480] ==================================================================
It seems that global pcc_data[pcc_ss_id] can be freed in
acpi_cppc_processor_exit(), but we may later reference this value, so
NULLify it when freed.
Also remove the useless setting of data "pcc_channel_acquired", which
we're about to free.
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.