/* * SoC audio for HP iPAQ hx4700 * * Copyright (c) 2009 Philipp Zabel * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pxa2xx-i2s.h" static struct snd_soc_jack hs_jack; /* Headphones jack detection DAPM pin */ static struct snd_soc_jack_pin hs_jack_pin[] = { { .pin = "Headphone Jack", .mask = SND_JACK_HEADPHONE, }, { .pin = "Speaker", /* disable speaker when hp jack is inserted */ .mask = SND_JACK_HEADPHONE, .invert = 1, }, }; /* Headphones jack detection GPIO */ static struct snd_soc_jack_gpio hs_jack_gpio = { .gpio = GPIO75_HX4700_EARPHONE_nDET, .invert = true, .name = "hp-gpio", .report = SND_JACK_HEADPHONE, .debounce_time = 200, }; /* * iPAQ hx4700 uses I2S for capture and playback. */ static int hx4700_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_dai *codec_dai = rtd->codec_dai; struct snd_soc_dai *cpu_dai = rtd->cpu_dai; int ret = 0; /* set the I2S system clock as output */ ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, 0, SND_SOC_CLOCK_OUT); if (ret < 0) return ret; /* inform codec driver about clock freq * * (PXA I2S always uses divider 256) */ ret = snd_soc_dai_set_sysclk(codec_dai, 0, 256 * params_rate(params), SND_SOC_CLOCK_IN); if (ret < 0) return ret; return 0; } static struct snd_soc_ops hx4700_ops = { .hw_params = hx4700_hw_params, }; static int hx4700_spk_power(struct snd_soc_dapm_widget *w, struct snd_kcontrol *k, int event) { gpio_set_value(GPIO107_HX4700_SPK_nSD, !!SND_SOC_DAPM_EVENT_ON(event)); return 0; } static int hx4700_hp_power(struct snd_soc_dapm_widget *w, struct snd_kcontrol *k, int event) { gpio_set_value(GPIO92_HX4700_HP_DRIVER, !!SND_SOC_DAPM_EVENT_ON(event)); return 0; } /* hx4700 machine dapm widgets */ static const struct snd_soc_dapm_widget hx4700_dapm_widgets[] = { SND_SOC_DAPM_HP("Headphone Jack", hx4700_hp_power), SND_SOC_DAPM_SPK("Speaker", hx4700_spk_power), SND_SOC_DAPM_MIC("Built-in Microphone", NULL), }; /* hx4700 machine audio_map */ static const struct snd_soc_dapm_route hx4700_audio_map[] = { /* Headphone connected to LOUT, ROUT */ {"Headphone Jack", NULL, "LOUT"}, {"Headphone Jack", NULL, "ROUT"}, /* Speaker connected to MOUT2 */ {"Speaker", NULL, "MOUT2"}, /* Microphone connected to MICIN */ {"MICIN", NULL, "Built-in Microphone"}, {"AIN", NULL, "MICOUT"}, }; /* * Logic for a ak4641 as connected on a HP iPAQ hx4700 */ static int hx4700_ak4641_init(struct snd_soc_pcm_runtime *rtd) { int err; /* Jack detection API stuff */ err = snd_soc_card_jack_new(rtd->card, "Headphone Jack", SND_JACK_HEADPHONE, &hs_jack, hs_jack_pin, ARRAY_SIZE(hs_jack_pin)); if (err) return err; err = snd_soc_jack_add_gpios(&hs_jack, 1, &hs_jack_gpio); return err; } static int hx4700_card_remove(struct snd_soc_card *card) { snd_soc_jack_free_gpios(&hs_jack, 1, &hs_jack_gpio); return 0; } /* hx4700 digital audio interface glue - connects codec <--> CPU */ static struct snd_soc_dai_link hx4700_dai = { .name = "ak4641", .stream_name = "AK4641", .cpu_dai_name = "pxa2xx-i2s", .codec_dai_name = "ak4641-hifi", .platform_name = "pxa-pcm-audio", .codec_name = "ak4641.0-0012", .init = hx4700_ak4641_init, .dai_fmt = SND_SOC_DAIFMT_MSB | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS, .ops = &hx4700_ops, }; /* hx4700 audio machine driver */ static struct snd_soc_card snd_soc_card_hx4700 = { .name = "iPAQ hx4700", .owner = THIS_MODULE, .remove = hx4700_card_remove, .dai_link = &hx4700_dai, .num_links = 1, .dapm_widgets = hx4700_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(hx4700_dapm_widgets), .dapm_routes = hx4700_audio_map, .num_dapm_routes = ARRAY_SIZE(hx4700_audio_map), .fully_routed = true, }; static struct gpio hx4700_audio_gpios[] = { { GPIO107_HX4700_SPK_nSD, GPIOF_OUT_INIT_HIGH, "SPK_POWER" }, { GPIO92_HX4700_HP_DRIVER, GPIOF_OUT_INIT_LOW, "EP_POWER" }, }; static int hx4700_audio_probe(struct platform_device *pdev) { int ret; if (!machine_is_h4700()) return -ENODEV; ret = gpio_request_array(hx4700_audio_gpios, ARRAY_SIZE(hx4700_audio_gpios)); if (ret) return ret; snd_soc_card_hx4700.dev = &pdev->dev; ret = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_hx4700); if (ret) gpio_free_array(hx4700_audio_gpios, ARRAY_SIZE(hx4700_audio_gpios)); return ret; } static int hx4700_audio_remove(struct platform_device *pdev) { gpio_set_value(GPIO92_HX4700_HP_DRIVER, 0); gpio_set_value(GPIO107_HX4700_SPK_nSD, 0); gpio_free_array(hx4700_audio_gpios, ARRAY_SIZE(hx4700_audio_gpios)); return 0; } static struct platform_driver hx4700_audio_driver = { .driver = { .name = "hx4700-audio", .pm = &snd_soc_pm_ops, }, .probe = hx4700_audio_probe, .remove = hx4700_audio_remove, }; module_platform_driver(hx4700_audio_driver); MODULE_AUTHOR("Philipp Zabel"); MODULE_DESCRIPTION("ALSA SoC iPAQ hx4700"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:hx4700-audio"); 7294f2ce6'>9bf9f9b4971df55a46e0a6750d3f6cd37bf1d9f0 /tools/arch/arm64 parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
firmware: fix NULL pointer dereference in __fw_load_abort()
Since commit 5d47ec02c37ea6 ("firmware: Correct handling of fw_state_wait() return value") fw_load_abort() could be called twice and lead us to a kernel crash. This happens only when the firmware fallback mechanism (regular or custom) is used. The fallback mechanism exposes a sysfs interface for userspace to upload a file and notify the kernel when the file is loaded and ready, or to cancel an upload by echo'ing -1 into on the loading file: echo -n "-1" > /sys/$DEVPATH/loading This will call fw_load_abort(). Some distributions actually have a udev rule in place to *always* immediately cancel all firmware fallback mechanism requests (Debian), they have: $ cat /lib/udev/rules.d/50-firmware.rules # stub for immediately telling the kernel that userspace firmware loading # failed; necessary to avoid long timeouts with CONFIG_FW_LOADER_USER_HELPER=y SUBSYSTEM=="firmware", ACTION=="add", ATTR{loading}="-1 Distributions with this udev rule would run into this crash only if the fallback mechanism is used. Since most distributions disable by default using the fallback mechanism (CONFIG_FW_LOADER_USER_HELPER_FALLBACK), this would typicaly mean only 2 drivers which *require* the fallback mechanism could typically incur a crash: drivers/firmware/dell_rbu.c and the drivers/leds/leds-lp55xx-common.c driver. Distributions enabling CONFIG_FW_LOADER_USER_HELPER_FALLBACK by default are obviously more exposed to this crash. The crash happens because after commit 5b029624948d ("firmware: do not use fw_lock for fw_state protection") and subsequent fix commit 5d47ec02c37ea6 ("firmware: Correct handling of fw_state_wait() return value") a race can happen between this cancelation and the firmware fw_state_wait_timeout() being woken up after a state change with which fw_load_abort() as that calls swake_up(). Upon error fw_state_wait_timeout() will also again call fw_load_abort() and trigger a null reference. At first glance we could just fix this with a !buf check on fw_load_abort() before accessing buf->fw_st, however there is a logical issue in having a state machine used for the fallback mechanism and preventing access from it once we abort as its inside the buf (buf->fw_st). The firmware_class.c code is setting the buf to NULL to annotate an abort has occurred. Replace this mechanism by simply using the state check instead. All the other code in place already uses similar checks for aborting as well so no further changes are needed. An oops can be reproduced with the new fw_fallback.sh fallback mechanism cancellation test. Either cancelling the fallback mechanism or the custom fallback mechanism triggers a crash. mcgrof@piggy ~/linux-next/tools/testing/selftests/firmware (git::20170111-fw-fixes)$ sudo ./fw_fallback.sh ./fw_fallback.sh: timeout works ./fw_fallback.sh: firmware comparison works ./fw_fallback.sh: fallback mechanism works [ this then sits here when it is trying the cancellation test ] Kernel log: test_firmware: loading 'nope-test-firmware.bin' misc test_firmware: Direct firmware load for nope-test-firmware.bin failed with error -2 misc test_firmware: Falling back to user helper BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 IP: _request_firmware+0xa27/0xad0 PGD 0 Oops: 0000 [#1] SMP Modules linked in: test_firmware(E) ... etc ... CPU: 1 PID: 1396 Comm: fw_fallback.sh Tainted: G W E 4.10.0-rc3-next-20170111+ #30 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.1-0-g8891697-prebuilt.qemu-project.org 04/01/2014 task: ffff9740b27f4340 task.stack: ffffbb15c0bc8000 RIP: 0010:_request_firmware+0xa27/0xad0 RSP: 0018:ffffbb15c0bcbd10 EFLAGS: 00010246 RAX: 00000000fffffffe RBX: ffff9740afe5aa80 RCX: 0000000000000000 RDX: ffff9740b27f4340 RSI: 0000000000000283 RDI: 0000000000000000 RBP: ffffbb15c0bcbd90 R08: ffffbb15c0bcbcd8 R09: 0000000000000000 R10: 0000000894a0d4b1 R11: 000000000000008c R12: ffffffffc0312480 R13: 0000000000000005 R14: ffff9740b1c32400 R15: 00000000000003e8 FS: 00007f8604422700(0000) GS:ffff9740bfc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 000000012164c000 CR4: 00000000000006e0 Call Trace: request_firmware+0x37/0x50 trigger_request_store+0x79/0xd0 [test_firmware] dev_attr_store+0x18/0x30 sysfs_kf_write+0x37/0x40 kernfs_fop_write+0x110/0x1a0 __vfs_write+0x37/0x160 ? _cond_resched+0x1a/0x50 vfs_write+0xb5/0x1a0 SyS_write+0x55/0xc0 ? trace_do_page_fault+0x37/0xd0 entry_SYSCALL_64_fastpath+0x1e/0xad RIP: 0033:0x7f8603f49620 RSP: 002b:00007fff6287b788 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055c307b110a0 RCX: 00007f8603f49620 RDX: 0000000000000016 RSI: 000055c3084d8a90 RDI: 0000000000000001 RBP: 0000000000000016 R08: 000000000000c0ff R09: 000055c3084d6336 R10: 000055c307b108b0 R11: 0000000000000246 R12: 000055c307b13c80 R13: 000055c3084d6320 R14: 0000000000000000 R15: 00007fff6287b950 Code: 9f 64 84 e8 9c 61 fe ff b8 f4 ff ff ff e9 6b f9 ff ff 48 c7 c7 40 6b 8d 84 89 45 a8 e8 43 84 18 00 49 8b be 00 03 00 00 8b 45 a8 <83> 7f 38 02 74 08 e8 6e ec ff ff 8b 45 a8 49 c7 86 00 03 00 00 RIP: _request_firmware+0xa27/0xad0 RSP: ffffbb15c0bcbd10 CR2: 0000000000000038 ---[ end trace 6d94ac339c133e6f ]--- Fixes: 5d47ec02c37e ("firmware: Correct handling of fw_state_wait() return value") Reported-and-Tested-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reported-and-Tested-by: Patrick Bruenn <p.bruenn@beckhoff.com> Reported-by: Chris Wilson <chris@chris-wilson.co.uk> CC: <stable@vger.kernel.org> [3.10+] Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/arch/arm64')