There are destructive operations such as nfcmrvl_fw_dnld_abort and
gpio_free in nfcmrvl_nci_unregister_dev. The resources such as firmware,
gpio and so on could be destructed while the upper layer functions such as
nfcmrvl_fw_dnld_start and nfcmrvl_nci_recv_frame is executing, which leads
to double-free, use-after-free and null-ptr-deref bugs.
There are three situations that could lead to double-free bugs.
The first situation is shown below:
(Thread 1) | (Thread 2)
nfcmrvl_fw_dnld_start |
... | nfcmrvl_nci_unregister_dev
release_firmware() | nfcmrvl_fw_dnld_abort
kfree(fw) //(1) | fw_dnld_over
| release_firmware
... | kfree(fw) //(2)
| ...
The second situation is shown below:
(Thread 1) | (Thread 2)
nfcmrvl_fw_dnld_start |
... |
mod_timer |
(wait a time) |
fw_dnld_timeout | nfcmrvl_nci_unregister_dev
fw_dnld_over | nfcmrvl_fw_dnld_abort
release_firmware | fw_dnld_over
kfree(fw) //(1) | release_firmware
... | kfree(fw) //(2)
The third situation is shown below:
(Thread 1) | (Thread 2)
nfcmrvl_nci_recv_frame |
if(..->fw_download_in_progress)|
nfcmrvl_fw_dnld_recv_frame |
queue_work |
|
fw_dnld_rx_work | nfcmrvl_nci_unregister_dev
fw_dnld_over | nfcmrvl_fw_dnld_abort
release_firmware | fw_dnld_over
kfree(fw) //(1) | release_firmware
| kfree(fw) //(2)
The firmware struct is deallocated in position (1) and deallocated
in position (2) again.
The crash trace triggered by POC is like below:
[ 122.640457] BUG: KASAN: double-free or invalid-free in fw_dnld_over+0x28/0xf0
[ 122.640457] Call Trace:
[ 122.640457] <TASK>
[ 122.640457] kfree+0xb0/0x330
[ 122.640457] fw_dnld_over+0x28/0xf0
[ 122.640457] nfcmrvl_nci_unregister_dev+0x61/0x70
[ 122.640457] nci_uart_tty_close+0x87/0xd0
[ 122.640457] tty_ldisc_kill+0x3e/0x80
[ 122.640457] tty_ldisc_hangup+0x1b2/0x2c0
[ 122.640457] __tty_hangup.part.0+0x316/0x520
[ 122.640457] tty_release+0x200/0x670
[ 122.640457] __fput+0x110/0x410
[ 122.640457] task_work_run+0x86/0xd0
[ 122.640457] exit_to_user_mode_prepare+0x1aa/0x1b0
[ 122.640457] syscall_exit_to_user_mode+0x19/0x50
[ 122.640457] do_syscall_64+0x48/0x90
[ 122.640457] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 122.640457] RIP: 0033:0x7f68433f6beb
What's more, there are also use-after-free and null-ptr-deref bugs
in nfcmrvl_fw_dnld_start. If we deallocate firmware struct, gpio or
set null to the members of priv->fw_dnld in nfcmrvl_nci_unregister_dev,
then, we dereference firmware, gpio or the members of priv->fw_dnld in
nfcmrvl_fw_dnld_start, the UAF or NPD bugs will happen.
This patch reorders destructive operations after nci_unregister_device
and adds bool variable protected by device_lock to synchronize between
cleanup routine and firmware download routine. The process is shown below.
(Thread 1) | (Thread 2)
nfcmrvl_nci_unregister_dev |
nci_unregister_device |
nfc_unregister_device | nfc_fw_download
device_lock() |
... |
nfc_download = false; | ...
device_unlock() |
... | device_lock()
(destructive operations) | if(.. || !nfc_download)
| goto error;
| error:
| device_unlock()
If the device is detaching, the download function will goto error.
If the download function is executing, nci_unregister_device will
wait until download function is finished.
Fixes: 3194c6870158 ("NFC: nfcmrvl: add firmware download support")
Signed-off-by: Duoming Zhou <[email protected]>
---
Changes in v3:
- Add bool variable to synchronize.
- Make commit message clearer.
drivers/nfc/nfcmrvl/main.c | 2 +-
net/nfc/core.c | 5 ++++-
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/nfc/nfcmrvl/main.c b/drivers/nfc/nfcmrvl/main.c
index 2fcf545012b..1a5284de434 100644
--- a/drivers/nfc/nfcmrvl/main.c
+++ b/drivers/nfc/nfcmrvl/main.c
@@ -183,6 +183,7 @@ void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
{
struct nci_dev *ndev = priv->ndev;
+ nci_unregister_device(ndev);
if (priv->ndev->nfc_dev->fw_download_in_progress)
nfcmrvl_fw_dnld_abort(priv);
@@ -191,7 +192,6 @@ void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
if (gpio_is_valid(priv->config.reset_n_io))
gpio_free(priv->config.reset_n_io);
- nci_unregister_device(ndev);
nci_free_device(ndev);
kfree(priv);
}
diff --git a/net/nfc/core.c b/net/nfc/core.c
index dc7a2404efd..da8199f67d4 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -25,6 +25,7 @@
#define NFC_CHECK_PRES_FREQ_MS 2000
int nfc_devlist_generation;
+bool nfc_download;
DEFINE_MUTEX(nfc_devlist_mutex);
/* NFC device ID bitmap */
@@ -38,7 +39,7 @@ int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
device_lock(&dev->dev);
- if (!device_is_registered(&dev->dev)) {
+ if (!device_is_registered(&dev->dev) || !nfc_download) {
rc = -ENODEV;
goto error;
}
@@ -1134,6 +1135,7 @@ int nfc_register_device(struct nfc_dev *dev)
dev->rfkill = NULL;
}
}
+ nfc_download = true;
device_unlock(&dev->dev);
rc = nfc_genl_device_added(dev);
@@ -1166,6 +1168,7 @@ void nfc_unregister_device(struct nfc_dev *dev)
rfkill_unregister(dev->rfkill);
rfkill_destroy(dev->rfkill);
}
+ nfc_download = false;
device_unlock(&dev->dev);
if (dev->ops->check_presence) {
--
2.17.1
Hi Duoming,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on net/master]
url: https://github.com/intel-lab-lkp/linux/commits/Duoming-Zhou/nfc-nfcmrvl-main-reorder-destructive-operations-in-nfcmrvl_nci_unregister_dev-to-avoid-bugs/20220427-000533
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 24cbdb910bb62b5be3865275e5682be1a7708c0f
config: i386-randconfig-s001-20220425 (https://download.01.org/0day-ci/archive/20220427/[email protected]/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://github.com/intel-lab-lkp/linux/commit/87bb704da970003fb8a7091317e0e5a1b1f2b009
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Duoming-Zhou/nfc-nfcmrvl-main-reorder-destructive-operations-in-nfcmrvl_nci_unregister_dev-to-avoid-bugs/20220427-000533
git checkout 87bb704da970003fb8a7091317e0e5a1b1f2b009
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash net/nfc/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
sparse warnings: (new ones prefixed by >>)
>> net/nfc/core.c:28:6: sparse: sparse: symbol 'nfc_download' was not declared. Should it be static?
Please review and possibly fold the followup patch.
--
0-DAY CI Kernel Test Service
https://01.org/lkp
net/nfc/core.c:28:6: warning: symbol 'nfc_download' was not declared. Should it be static?
Reported-by: kernel test robot <[email protected]>
Signed-off-by: kernel test robot <[email protected]>
---
net/nfc/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/nfc/core.c b/net/nfc/core.c
index da8199f67d42c..9035935e93d80 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -25,7 +25,7 @@
#define NFC_CHECK_PRES_FREQ_MS 2000
int nfc_devlist_generation;
-bool nfc_download;
+static bool nfc_download;
DEFINE_MUTEX(nfc_devlist_mutex);
/* NFC device ID bitmap */