From: Tom Zanussi <tzanussi@gmail.com>
To: "Pali Rohár" <pali.rohar@gmail.com>,
"Mario Limonciello" <mario.limonciello@dell.com>
Cc: linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>
Subject: dell_smbios KASAN bug
Date: Wed, 20 Mar 2019 13:29:20 -0500 [thread overview]
Message-ID: <1553106560.2080.5.camel@gmail.com> (raw)
Hi,
While looking into an unrelated problem, I hit this KASAN use-after-
free warning, so thought I'd let you know.
I have no idea how to fix it, but let me know if you need more info.
Thanks
Tom
[ 23.330893] ==================================================================
[ 23.330987] BUG: KASAN: use-after-free in dell_smbios_find_token+0x2e/0x80 [dell_smbios]
[ 23.330999] Read of size 2 at addr ffff88840c2bc1a8 by task systemd-udevd/479
[ 23.331020] CPU: 0 PID: 479 Comm: systemd-udevd Not tainted 5.1.0-rc1+ #9
[ 23.331025] Hardware name: Dell Inc. XPS 13 9360/02PG84, BIOS 2.3.1 10/03/2017
[ 23.331030] Call Trace:
[ 23.331043] dump_stack+0x7c/0xbb
[ 23.331059] ? dell_smbios_find_token+0x2e/0x80 [dell_smbios]
[ 23.331068] print_address_description+0xc7/0x280
[ 23.331080] ? dell_smbios_find_token+0x2e/0x80 [dell_smbios]
[ 23.331090] ? dell_smbios_find_token+0x2e/0x80 [dell_smbios]
[ 23.331101] kasan_report+0x14e/0x192
[ 23.331121] ? dell_smbios_find_token+0x2e/0x80 [dell_smbios]
[ 23.331139] dell_smbios_find_token+0x2e/0x80 [dell_smbios]
[ 23.331161] kbd_led_init+0x2e7/0x473 [dell_laptop]
[ 23.331178] ? dmi_matched+0x2a/0x2a [dell_laptop]
[ 23.331188] ? get_device_parent.isra.28+0x2a0/0x2a0
[ 23.331202] ? lockdep_init_map+0x98/0x2c0
[ 23.331229] ? platform_device_add+0x1b5/0x3a0
[ 23.331256] dell_init+0x4ad/0xb63 [dell_laptop]
[ 23.331271] ? kbd_led_init+0x473/0x473 [dell_laptop]
[ 23.331290] ? ___slab_alloc+0x61f/0x700
[ 23.331298] ? ___slab_alloc+0x61f/0x700
[ 23.331318] ? preempt_count_sub+0x15/0x100
[ 23.331339] ? kbd_led_init+0x473/0x473 [dell_laptop]
[ 23.331348] do_one_initcall+0xbd/0x3fd
[ 23.331359] ? perf_trace_initcall_level+0x280/0x280
[ 23.331369] ? kasan_unpoison_shadow+0x30/0x40
[ 23.331380] ? __kasan_kmalloc.constprop.8+0xa0/0xd0
[ 23.331397] ? kmem_cache_alloc_trace+0x163/0x390
[ 23.331405] ? kasan_unpoison_shadow+0x30/0x40
[ 23.331428] do_init_module+0xe3/0x341
[ 23.331447] load_module+0x2fc5/0x3ad0
[ 23.331528] ? layout_and_allocate+0x1170/0x1170
[ 23.331541] ? vfs_read+0xd4/0x1b0
[ 23.331558] ? kernel_read+0x74/0xa0
[ 23.331577] ? kernel_read_file+0x148/0x320
[ 23.331614] ? seccomp_notify_release+0x110/0x110
[ 23.331652] ? __do_sys_finit_module+0x192/0x1c0
[ 23.331660] __do_sys_finit_module+0x192/0x1c0
[ 23.331670] ? __ia32_sys_init_module+0x40/0x40
[ 23.331697] ? syscall_trace_enter+0x184/0x5e0
[ 23.331739] ? mark_held_locks+0x1a/0x90
[ 23.331760] do_syscall_64+0x72/0x220
[ 23.331773] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 23.331781] RIP: 0033:0x7fcb4f5f5a49
[ 23.331789] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 0f b4 2c 00 f7 d8 64 89 01 48
[ 23.331794] RSP: 002b:00007ffc73e340b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 23.331802] RAX: ffffffffffffffda RBX: 00005599992bb850 RCX: 00007fcb4f5f5a49
[ 23.331808] RDX: 0000000000000000 RSI: 00007fcb4f2e11c5 RDI: 0000000000000010
[ 23.331813] RBP: 00007fcb4f2e11c5 R08: 0000000000000000 R09: 00005599992bb850
[ 23.331819] R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000000
[ 23.331824] R13: 0000559999298f40 R14: 0000000000020000 R15: 00005599992bb850
[ 23.331873] Allocated by task 479:
[ 23.331886] __kasan_kmalloc.constprop.8+0xa0/0xd0
[ 23.331893] krealloc+0xa0/0xc0
[ 23.331900] 0xffffffffc0cc0075
[ 23.331909] dmi_decode_table+0xf6/0x140
[ 23.331915] dmi_walk+0x46/0x70
[ 23.331922] 0xffffffffc0cc0109
[ 23.331928] do_one_initcall+0xbd/0x3fd
[ 23.331935] do_init_module+0xe3/0x341
[ 23.331941] load_module+0x2fc5/0x3ad0
[ 23.331948] __do_sys_finit_module+0x192/0x1c0
[ 23.331954] do_syscall_64+0x72/0x220
[ 23.331961] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 23.331975] Freed by task 479:
[ 23.331985] __kasan_slab_free+0x111/0x150
[ 23.331990] kfree+0xf5/0x350
[ 23.331996] 0xffffffffc0cc01d4
[ 23.332002] do_one_initcall+0xbd/0x3fd
[ 23.332009] do_init_module+0xe3/0x341
[ 23.332015] load_module+0x2fc5/0x3ad0
[ 23.332022] __do_sys_finit_module+0x192/0x1c0
[ 23.332028] do_syscall_64+0x72/0x220
[ 23.332035] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 23.332050] The buggy address belongs to the object at ffff88840c2bc1a8
which belongs to the cache kmalloc-2k of size 2048
[ 23.332061] The buggy address is located 0 bytes inside of
2048-byte region [ffff88840c2bc1a8, ffff88840c2bc9a8)
[ 23.332070] The buggy address belongs to the page:
[ 23.332081] page:ffffea001030ae00 count:1 mapcount:0 mapping:ffff8884204113c0 index:0x0 compound_mapcount: 0
[ 23.332091] flags: 0x17ffffc0010200(slab|head)
[ 23.332100] raw: 0017ffffc0010200 ffffea0010367608 ffffea000ea31808 ffff8884204113c0
[ 23.332106] raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
[ 23.332111] page dumped because: kasan: bad access detected
[ 23.332124] Memory state around the buggy address:
[ 23.332134] ffff88840c2bc080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 23.332145] ffff88840c2bc100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 23.332155] >ffff88840c2bc180: fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb
[ 23.332164] ^
[ 23.332175] ffff88840c2bc200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.332185] ffff88840c2bc280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.332194] ==================================================================
next reply other threads:[~2019-03-20 18:29 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-20 18:29 Tom Zanussi [this message]
2019-03-20 18:41 ` dell_smbios KASAN bug Steven Rostedt
2019-03-20 19:05 ` Tom Zanussi
2019-03-20 19:13 ` Steven Rostedt
2019-03-20 19:30 ` Tom Zanussi
2019-03-20 19:45 ` Steven Rostedt
2019-03-20 20:28 ` Tom Zanussi
2019-03-20 20:32 ` Steven Rostedt
2019-03-20 20:44 ` Tom Zanussi
2019-03-25 13:22 ` Mario.Limonciello
2019-03-25 14:17 ` Steven Rostedt
2019-03-25 16:20 ` Tom Zanussi
2019-04-03 17:16 ` Steven Rostedt
2019-04-03 19:14 ` Tom Zanussi
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