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Subject[PATCH] staging: bcm2835-audio: Replace unsafe strcpy() with strscpy()
Date
Replace strcpy() with strscpy() in bcm2835-audio/bcm2835.c to prevent the
following when loading snd-bcm2835:

[ 58.480634] ------------[ cut here ]------------
[ 58.485321] kernel BUG at lib/string.c:1149!
[ 58.489650] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 58.495214] Modules linked in: snd_bcm2835(COE+) snd_pcm snd_timer snd dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua btsdio bluetooth ecdh_generic ecc bcm2835_v4l2(CE) bcm2835_codec(CE) brcmfmac bcm2835_isp(CE) bcm2835_mmal_vchiq(CE) brcmutil cfg80211 v4l2_mem2mem videobuf2_vmalloc videobuf2_dma_contig videobuf2_memops raspberrypi_hwmon videobuf2_v4l2 videobuf2_common videodev bcm2835_gpiomem mc vc_sm_cma(CE) rpivid_mem uio_pdrv_genirq uio sch_fq_codel drm ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 raid0 multipath linear dwc2 roles spidev udc_core crct10dif_ce xhci_pci xhci_pci_renesas phy_generic aes_neon_bs aes_neon_blk crypto_simd cryptd
[ 58.563787] CPU: 3 PID: 1959 Comm: insmod Tainted: G C OE 5.11.0-1001-raspi #1
[ 58.572172] Hardware name: Raspberry Pi 4 Model B Rev 1.2 (DT)
[ 58.578086] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
[ 58.584178] pc : fortify_panic+0x20/0x24
[ 58.588161] lr : fortify_panic+0x20/0x24
[ 58.592136] sp : ffff800010a83990
[ 58.595491] x29: ffff800010a83990 x28: 0000000000000002
[ 58.600879] x27: ffffb0b07cb72928 x26: 0000000000000000
[ 58.606268] x25: ffff39e884973838 x24: ffffb0b07cb74190
[ 58.611655] x23: ffffb0b07cb72030 x22: 0000000000000000
[ 58.617042] x21: ffff39e884973014 x20: ffff39e88b793010
[ 58.622428] x19: ffffb0b07cb72670 x18: 0000000000000030
[ 58.627814] x17: 0000000000000000 x16: ffffb0b092ce2c1c
[ 58.633200] x15: ffff39e88b901500 x14: 0720072007200720
[ 58.638588] x13: 0720072007200720 x12: 0720072007200720
[ 58.643979] x11: ffffb0b0936cbdf0 x10: 00000000fffff000
[ 58.649366] x9 : ffffb0b09220cfa8 x8 : 0000000000000000
[ 58.654752] x7 : ffffb0b093673df0 x6 : ffffb0b09364e000
[ 58.660140] x5 : 0000000000000000 x4 : ffff39e93b7db948
[ 58.665526] x3 : ffff39e93b7ebcf0 x2 : 0000000000000000
[ 58.670913] x1 : 0000000000000000 x0 : 0000000000000022
[ 58.676299] Call trace:
[ 58.678775] fortify_panic+0x20/0x24
[ 58.682402] snd_bcm2835_alsa_probe+0x5b8/0x7d8 [snd_bcm2835]
[ 58.688247] platform_probe+0x74/0xe4
[ 58.691963] really_probe+0xf0/0x510
[ 58.695585] driver_probe_device+0xe0/0x100
[ 58.699826] device_driver_attach+0xcc/0xd4
[ 58.704068] __driver_attach+0xb0/0x17c
[ 58.707956] bus_for_each_dev+0x7c/0xd4
[ 58.711843] driver_attach+0x30/0x40
[ 58.715467] bus_add_driver+0x154/0x250
[ 58.719354] driver_register+0x84/0x140
[ 58.723242] __platform_driver_register+0x34/0x40
[ 58.728013] bcm2835_alsa_driver_init+0x30/0x1000 [snd_bcm2835]
[ 58.734024] do_one_initcall+0x54/0x300
[ 58.737914] do_init_module+0x60/0x280
[ 58.741719] load_module+0x680/0x770
[ 58.745344] __do_sys_finit_module+0xbc/0x130
[ 58.749761] __arm64_sys_finit_module+0x2c/0x40
[ 58.754356] el0_svc_common.constprop.0+0x88/0x220
[ 58.759216] do_el0_svc+0x30/0xa0
[ 58.762575] el0_svc+0x28/0x70
[ 58.765669] el0_sync_handler+0x1a4/0x1b0
[ 58.769732] el0_sync+0x178/0x180
[ 58.773095] Code: aa0003e1 91366040 910003fd 97ffee21 (d4210000)
[ 58.779275] ---[ end trace 29be5b17497bd898 ]---
[ 58.783955] note: insmod[1959] exited with preempt_count 1
[ 58.791921] ------------[ cut here ]------------

For the sake of it, replace all the other occurences of strcpy() under
bcm2835-audio/ as well.

Signed-off-by: Juerg Haefliger <juergh@canonical.com>
---
drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c | 6 +++---
drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c | 2 +-
drivers/staging/vc04_services/bcm2835-audio/bcm2835.c | 6 +++---
3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
index 4c2cae99776b..3703409715da 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
@@ -224,7 +224,7 @@ int snd_bcm2835_new_ctl(struct bcm2835_chip *chip)
{
int err;

- strcpy(chip->card->mixername, "Broadcom Mixer");
+ strscpy(chip->card->mixername, "Broadcom Mixer", sizeof(chip->card->mixername));
err = create_ctls(chip, ARRAY_SIZE(snd_bcm2835_ctl), snd_bcm2835_ctl);
if (err < 0)
return err;
@@ -261,7 +261,7 @@ static const struct snd_kcontrol_new snd_bcm2835_headphones_ctl[] = {

int snd_bcm2835_new_headphones_ctl(struct bcm2835_chip *chip)
{
- strcpy(chip->card->mixername, "Broadcom Mixer");
+ strscpy(chip->card->mixername, "Broadcom Mixer", sizeof(chip->card->mixername));
return create_ctls(chip, ARRAY_SIZE(snd_bcm2835_headphones_ctl),
snd_bcm2835_headphones_ctl);
}
@@ -295,7 +295,7 @@ static const struct snd_kcontrol_new snd_bcm2835_hdmi[] = {

int snd_bcm2835_new_hdmi_ctl(struct bcm2835_chip *chip)
{
- strcpy(chip->card->mixername, "Broadcom Mixer");
+ strscpy(chip->card->mixername, "Broadcom Mixer", sizeof(chip->card->mixername));
return create_ctls(chip, ARRAY_SIZE(snd_bcm2835_hdmi),
snd_bcm2835_hdmi);
}
diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
index f783b632141b..096f2c54258a 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
@@ -334,7 +334,7 @@ int snd_bcm2835_new_pcm(struct bcm2835_chip *chip, const char *name,

pcm->private_data = chip;
pcm->nonatomic = true;
- strcpy(pcm->name, name);
+ strscpy(pcm->name, name, sizeof(pcm->name));
if (!spdif) {
chip->dest = route;
chip->volume = 0;
diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
index cf5f80f5ca6b..c250fbef2fa3 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -185,9 +185,9 @@ static int snd_add_child_device(struct device *dev,
goto error;
}

- strcpy(card->driver, audio_driver->driver.name);
- strcpy(card->shortname, audio_driver->shortname);
- strcpy(card->longname, audio_driver->longname);
+ strscpy(card->driver, audio_driver->driver.name, sizeof(card->driver));
+ strscpy(card->shortname, audio_driver->shortname, sizeof(card->shortname));
+ strscpy(card->longname, audio_driver->longname, sizeof(card->longname));

err = audio_driver->newpcm(chip, audio_driver->shortname,
audio_driver->route,
--
2.27.0
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