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From: Hui Peng <benquike@gmail.com>
To: security@kernel.org
Cc: mathias.payer@nebelwelt.net, perex@perex.cz, tiwai@suse.com,
	tglx@linutronix.de, wang6495@umn.edu, allison@lohutok.net,
	yuehaibing@huawei.com, alsa-devel@alsa-project.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Fix a stack buffer overflow bug check_input_term
Date: Thu, 15 Aug 2019 00:47:19 -0400	[thread overview]
Message-ID: <d4f3e70e-bbaa-6517-a2f2-8cd5e14c67cf@gmail.com> (raw)
In-Reply-To: <20190815043554.16623-1-benquike@gmail.com>

[-- Attachment #1: Type: text/plain, Size: 1899 bytes --]

The stack trace differs from test to test, the attached trace1 file is
taken from one of the tests.

The bug is confirmed by adding some printk statement in
`check_input_term`, the trace with output of printk is attached in
trace2 file.

This patch is a tentative fix to the bug, please give me feedback.

On 8/15/19 12:35 AM, Hui Peng wrote:
> `check_input_term` recursively calls itself with input
> from device side (e.g., uac_input_terminal_descriptor.bCSourceID)
> as argument (id). In `check_input_term`, if `check_input_term`
> is called with the same `id` argument as the caller, it triggers
> endless recursive call, resulting kernel space stack overflow.
>
> This patch fixes the bug by adding a bitmap to `struct mixer_build`
> to keep track of the checked ids by `check_input_term` and stop
> the execution if some id has been checked (similar to how
> parse_audio_unit handles unitid argument).
>
> Reported-by: Hui Peng <benquike@gmail.com>
> Reported-by: Mathias Payer <mathias.payer@nebelwelt.net>
> Signed-off-by: Hui Peng <benquike@gmail.com>
> ---
>  sound/usb/mixer.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
> index ea487378be17..1f6c8213df82 100644
> --- a/sound/usb/mixer.c
> +++ b/sound/usb/mixer.c
> @@ -68,6 +68,7 @@ struct mixer_build {
>  	unsigned char *buffer;
>  	unsigned int buflen;
>  	DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
> +	DECLARE_BITMAP(termbitmap, MAX_ID_ELEMS);
>  	struct usb_audio_term oterm;
>  	const struct usbmix_name_map *map;
>  	const struct usbmix_selector_map *selector_map;
> @@ -782,6 +783,8 @@ static int check_input_term(struct mixer_build *state, int id,
>  	int err;
>  	void *p1;
>  
> +	if (test_and_set_bit(id, state->termbitmap))
> +		return 0;
>  	memset(term, 0, sizeof(*term));
>  	while ((p1 = find_audio_control_unit(state, id)) != NULL) {
>  		unsigned char *hdr = p1;

[-- Attachment #2: trace2 --]
[-- Type: text/plain, Size: 13307 bytes --]

[    7.839002] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[    7.966787] usb 1-1: Using ep0 maxpacket: 16
[    7.969898] usb 1-1: string descriptor 0 read error: -22
[    7.971507] usb 1-1: New USB device found, idVendor=046d, idProduct=0a44, bcdDevice= 1.27
[    7.973874] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    7.979864] usb 1-1: current rate 16732531 is different from the runtime rate 48000
[    7.982029] usb 1-1: current rate 11254477 is different from the runtime rate 48000
[    7.987190] [parse_audio_unit:2797] reached
[    7.987741] [parse_audio_unit:2814] reached
[    7.988310] [parse_audio_feature_unit:1855] reached
[    7.988982] [parse_audio_feature_unit:1915] reached
[    7.989605] [parse_audio_unit:2797] reached
[    7.990173] [parse_audio_unit:2804] reached
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[    8.006324] [check_input_term:804] reached
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........

[-- Attachment #3: trace1 --]
[-- Type: text/plain, Size: 5764 bytes --]

[   11.951264] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[   12.078302] usb 1-1: Using ep0 maxpacket: 16
[   12.080698] usb 1-1: string descriptor 0 read error: -22
[   12.081917] usb 1-1: New USB device found, idVendor=046d, idProduct=0a44, bcdDevice= 1.27
[   12.083734] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   12.090675] usb 1-1: current rate 16732531 is different from the runtime rate 48000
[   12.092985] usb 1-1: current rate 11254477 is different from the runtime rate 48000
[   12.105244] BUG: KASAN: use-after-free in tick_sched_handle+0x51/0x90
[   12.106010] Read of size 8 at addr ffff88815a1a9ed0 by task kworker/3:2/4772
[   12.106841]
[   12.107023] CPU: 3 PID: 4772 Comm: kworker/3:2 Not tainted 5.3.0-rc4+ #35
[   12.107841] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org 04/01/2014
[   12.109200] Workqueue: usb_hub_wq hub_event
[   12.109734] Call Trace:
[   12.110023]  <IRQ>
[   12.110266]  dump_stack+0x5b/0x8b
[   12.110665]  ? tick_sched_handle+0x51/0x90
[   12.111163]  print_address_description+0x6e/0x390
[   12.111749]  ? tick_sched_handle+0x51/0x90
[   12.112221]  ? tick_sched_handle+0x51/0x90
[   12.112732]  __kasan_report+0x149/0x18d
[   12.113175]  ? tick_sched_handle+0x51/0x90
[   12.113681]  kasan_report+0xe/0x20
[   12.114076]  tick_sched_handle+0x51/0x90
[   12.114529]  tick_sched_timer+0x32/0x90
[   12.115007]  __hrtimer_run_queues+0x1f5/0x450
[   12.115514]  ? tick_sched_do_timer+0x80/0x80
[   12.116041]  ? enqueue_hrtimer+0x100/0x100
[   12.116514]  ? kvm_clock_get_cycles+0xd/0x10
[   12.117038]  ? ktime_get_update_offsets_now+0xa4/0x160
[   12.117659]  hrtimer_interrupt+0x192/0x350
[   12.118133]  smp_apic_timer_interrupt+0x83/0x1c0
[   12.118696]  apic_timer_interrupt+0xf/0x20
[   12.119174] WARNING: can't dereference registers at 00000000394dde74 for ip apic_timer_interrupt+0xf/0x20
[   12.119175]  </IRQ>
[   12.120550]
[   12.120751] Allocated by task 1511944392:
[   12.121216] BUG: unable to handle page fault for address: ffffffff8712da08
[   12.122029] #PF: supervisor read access in kernel mode
[   12.122649] #PF: error_code(0x0000) - not-present page
[   12.123239] PGD 4212067 P4D 4212067 PUD 4213063 PMD 0
[   12.123860] Thread overran stack, or stack corrupted
[   12.124534] Oops: 0000 [#1] SMP KASAN PTI
[   12.125009] CPU: 3 PID: 4772 Comm: kworker/3:2 Not tainted 5.3.0-rc4+ #35
[   12.125816] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org 04/01/2014
[   12.127172] Workqueue: usb_hub_wq hub_event
[   12.127689] RIP: 0010:stack_depot_fetch+0x10/0x30
[   12.128227] Code: ff 48 8b 73 18 48 89 ef 5b 5d e9 4b bb bd ff 0f 0b 90 90 90 90 90 90 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 00 96 16 86 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
[   12.130392] RSP: 0018:ffff88815b189d68 EFLAGS: 00010006
[   12.131022] RAX: 00000000001f8881 RBX: ffff88815a1aa100 RCX: ffffffff812150de
[   12.131867] RDX: 0000000000000000 RSI: ffff88815b189d70 RDI: 0000000000003ff0
[   12.132722] RBP: ffff88815a1a9ed0 R08: ffffed102b633ea3 R09: ffffed102b633ea3
[   12.133554] R10: 0000000000000001 R11: ffffed102b633ea2 R12: ffff88815a9017c0
[   12.134375] R13: ffff88815a1a9100 R14: ffff88815a1aa100 R15: ffff88815b1a5b00
[   12.135209] FS:  0000000000000000(0000) GS:ffff88815b180000(0000) knlGS:0000000000000000
[   12.136156] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.136845] CR2: ffffffff8712da08 CR3: 0000000152f26000 CR4: 00000000000006e0
[   12.137688] Call Trace:
[   12.137977]  <IRQ>
[   12.138218]  print_track+0x35/0x6b
[   12.138647]  print_address_description+0x335/0x390
[   12.139200]  ? tick_sched_handle+0x51/0x90
[   12.139706]  ? tick_sched_handle+0x51/0x90
[   12.140177]  __kasan_report+0x149/0x18d
[   12.140654]  ? tick_sched_handle+0x51/0x90
[   12.141126]  kasan_report+0xe/0x20
[   12.141557]  tick_sched_handle+0x51/0x90
[   12.142009]  tick_sched_timer+0x32/0x90
[   12.142486]  __hrtimer_run_queues+0x1f5/0x450
[   12.142986]  ? tick_sched_do_timer+0x80/0x80
[   12.143514]  ? enqueue_hrtimer+0x100/0x100
[   12.143986]  ? kvm_clock_get_cycles+0xd/0x10
[   12.144510]  ? ktime_get_update_offsets_now+0xa4/0x160
[   12.145097]  hrtimer_interrupt+0x192/0x350
[   12.145602]  smp_apic_timer_interrupt+0x83/0x1c0
[   12.146133]  apic_timer_interrupt+0xf/0x20
[   12.146637]  </IRQ>
[   12.146885] Modules linked in:
[   12.147277] CR2: ffffffff8712da08
[   12.147662] ---[ end trace 542cd123c33e7da5 ]---
[   12.148203] RIP: 0010:stack_depot_fetch+0x10/0x30
[   12.148765] Code: ff 48 8b 73 18 48 89 ef 5b 5d e9 4b bb bd ff 0f 0b 90 90 90 90 90 90 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 00 96 16 86 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
[   12.150932] RSP: 0018:ffff88815b189d68 EFLAGS: 00010006
[   12.151556] RAX: 00000000001f8881 RBX: ffff88815a1aa100 RCX: ffffffff812150de
[   12.152395] RDX: 0000000000000000 RSI: ffff88815b189d70 RDI: 0000000000003ff0
[   12.153233] RBP: ffff88815a1a9ed0 R08: ffffed102b633ea3 R09: ffffed102b633ea3
[   12.154039] R10: 0000000000000001 R11: ffffed102b633ea2 R12: ffff88815a9017c0
[   12.154973] R13: ffff88815a1a9100 R14: ffff88815a1aa100 R15: ffff88815b1a5b00
[   12.155830] FS:  0000000000000000(0000) GS:ffff88815b180000(0000) knlGS:0000000000000000
[   12.156777] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.157473] CR2: ffffffff8712da08 CR3: 0000000152f26000 CR4: 00000000000006e0
[   12.158320] Kernel panic - not syncing: Fatal exception in interrupt
[   12.159210] Kernel Offset: disabled
[   12.159642] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---

  reply	other threads:[~2019-08-15  4:47 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15  4:35 Hui Peng
2019-08-15  4:47 ` Hui Peng [this message]
2019-08-15  6:13 ` Takashi Iwai
2019-08-15  6:58   ` Takashi Iwai
     [not found]     ` <CAKpmkkWCaLOctG44fD=arD-=oogRVCSxe5rz2UNUAms5q=2pYw@mail.gmail.com>
2019-08-15 17:38       ` Takashi Iwai
     [not found]         ` <c6b11a34-3bd9-f1d7-cd27-4ddcd210a7cc@gmail.com>
2019-08-15 20:16           ` Takashi Iwai

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