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Message-Id: <20250116-ufshcd-fix-v3-1-6a83004ea85c@linaro.org>
Date: Thu, 16 Jan 2025 11:18:08 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Peter Griffin <peter.griffin@...aro.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Mike Snitzer <snitzer@...hat.com>, Jens Axboe <axboe@...nel.dk>,
Ulf Hansson <ulf.hansson@...aro.org>, Satya Tangirala <satyat@...gle.com>,
Eric Biggers <ebiggers@...gle.com>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>,
Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, stable@...r.kernel.org,
André Draszik <andre.draszik@...aro.org>
Subject: [PATCH v3] scsi: ufs: fix use-after free in init error and remove
paths
devm_blk_crypto_profile_init() registers a cleanup handler to run when
the associated (platform-) device is being released. For UFS, the
crypto private data and pointers are stored as part of the ufs_hba's
data structure 'struct ufs_hba::crypto_profile'. This structure is
allocated as part of the underlying ufshd allocation.
During driver release or during error handling in ufshcd_pltfrm_init(),
this structure is released as part of ufshcd_dealloc_host() before the
(platform-) device associated with the crypto call above is released.
Once this device is released, the crypto cleanup code will run, using
the just-released 'struct ufs_hba::crypto_profile'. This causes a
use-after-free situation:
exynos-ufshc 14700000.ufs: ufshcd_pltfrm_init() failed -11
exynos-ufshc 14700000.ufs: probe with driver exynos-ufshc failed with error -11
Unable to handle kernel paging request at virtual address 01adafad6dadad88
Mem abort info:
ESR = 0x0000000096000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[01adafad6dadad88] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.13.0-rc5-next-20250106+ #70
Tainted: [W]=WARN
Hardware name: Oriole (DT)
pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : kfree+0x60/0x2d8
lr : kvfree+0x44/0x60
sp : ffff80008009ba80
x29: ffff80008009ba90 x28: 0000000000000000 x27: ffffbcc6591e0130
x26: ffffbcc659309960 x25: ffffbcc658f89c50 x24: ffffbcc659539d80
x23: ffff22e000940040 x22: ffff22e001539010 x21: ffffbcc65714b22c
x20: 6b6b6b6b6b6b6b6b x19: 01adafad6dadad80 x18: 0000000000000000
x17: ffffbcc6579fbac8 x16: ffffbcc657a04300 x15: ffffbcc657a027f4
x14: ffffbcc656f969cc x13: ffffbcc6579fdc80 x12: ffffbcc6579fb194
x11: ffffbcc6579fbc34 x10: 0000000000000000 x9 : ffffbcc65714b22c
x8 : ffff80008009b880 x7 : 0000000000000000 x6 : ffff80008009b940
x5 : ffff80008009b8c0 x4 : ffff22e000940518 x3 : ffff22e006f54f40
x2 : ffffbcc657a02268 x1 : ffff80007fffffff x0 : ffffc1ffc0000000
Call trace:
kfree+0x60/0x2d8 (P)
kvfree+0x44/0x60
blk_crypto_profile_destroy_callback+0x28/0x70
devm_action_release+0x1c/0x30
release_nodes+0x6c/0x108
devres_release_all+0x98/0x100
device_unbind_cleanup+0x20/0x70
really_probe+0x218/0x2d0
In other words, the initialisation code flow is:
platform-device probe
ufshcd_pltfrm_init()
ufshcd_alloc_host()
scsi_host_alloc()
allocation of struct ufs_hba
creation of scsi-host devices
devm_blk_crypto_profile_init()
devm registration of cleanup handler using platform-device
and during error handling of ufshcd_pltfrm_init() or during driver
removal:
ufshcd_dealloc_host()
scsi_host_put()
put_device(scsi-host)
release of struct ufs_hba
put_device(platform-device)
crypto cleanup handler
To fix this use-after free, change ufshcd_alloc_host() to register a
devres action to automatically cleanup the underlying SCSI device on
ufshcd destruction, without requiring explicit calls to
ufshcd_dealloc_host(). This way:
* the crypto profile and all other ufs_hba-owned resources are
destroyed before SCSI (as they've been registered after)
* a memleak is plugged in tc-dwc-g210-pci.c remove() as a
side-effect
* EXPORT_SYMBOL_GPL(ufshcd_dealloc_host) can be removed fully as
it's not needed anymore
* no future drivers using ufshcd_alloc_host() could ever forget
adding the cleanup
Fixes: cb77cb5abe1f ("blk-crypto: rename blk_keyslot_manager to blk_crypto_profile")
Fixes: d76d9d7d1009 ("scsi: ufs: use devm_blk_ksm_init()")
Cc: stable@...r.kernel.org
Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
Changes in v3:
- rename devres action handler to ufshcd_devres_release() (Bart)
- Link to v2: https://lore.kernel.org/r/20250114-ufshcd-fix-v2-1-2dc627590a4a@linaro.org
Changes in v2:
- completely new approach using devres action for Scsi_host cleanup, to
ensure ordering
- add Fixes: and CC: stable tags (Eric)
- Link to v1: https://lore.kernel.org/r/20250113-ufshcd-fix-v1-1-ca63d1d4bd55@linaro.org
---
In my case, as per above trace I initially encountered an error in
ufshcd_verify_dev_init(), which made me notice this problem both during
error handling and release. For reproducing, it'd be possible to change
that function to just return an error, or rmmod the platform glue
driver.
Other approaches for solving this issue I see are the following, but I
believe this one here is the cleanest:
* turn 'struct ufs_hba::crypto_profile' into a dynamically allocated
pointer, in which case it doesn't matter if cleanup runs after
scsi_host_put()
* add an explicit devm_blk_crypto_profile_deinit() to be called by API
users when necessary, e.g. before ufshcd_dealloc_host() in this case
* register the crypto cleanup handler against the scsi-host device
instead, like in v1 of this patch
---
drivers/ufs/core/ufshcd.c | 27 +++++++++++++++++----------
drivers/ufs/host/ufshcd-pci.c | 2 --
drivers/ufs/host/ufshcd-pltfrm.c | 11 ++++-------
include/ufs/ufshcd.h | 1 -
4 files changed, 21 insertions(+), 20 deletions(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 43ddae7318cb..8351795296bb 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -10279,16 +10279,6 @@ int ufshcd_system_thaw(struct device *dev)
EXPORT_SYMBOL_GPL(ufshcd_system_thaw);
#endif /* CONFIG_PM_SLEEP */
-/**
- * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
- * @hba: pointer to Host Bus Adapter (HBA)
- */
-void ufshcd_dealloc_host(struct ufs_hba *hba)
-{
- scsi_host_put(hba->host);
-}
-EXPORT_SYMBOL_GPL(ufshcd_dealloc_host);
-
/**
* ufshcd_set_dma_mask - Set dma mask based on the controller
* addressing capability
@@ -10307,6 +10297,16 @@ static int ufshcd_set_dma_mask(struct ufs_hba *hba)
return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
}
+/**
+ * ufshcd_devres_release - devres cleanup handler, invoked during release of
+ * hba->dev
+ * @host: pointer to SCSI host
+ */
+static void ufshcd_devres_release(void *host)
+{
+ scsi_host_put(host);
+}
+
/**
* ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
* @dev: pointer to device handle
@@ -10334,6 +10334,13 @@ int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
err = -ENOMEM;
goto out_error;
}
+
+ err = devm_add_action_or_reset(dev, ufshcd_devres_release,
+ host);
+ if (err)
+ return dev_err_probe(dev, err,
+ "failed to add ufshcd dealloc action\n");
+
host->nr_maps = HCTX_TYPE_POLL + 1;
hba = shost_priv(host);
hba->host = host;
diff --git a/drivers/ufs/host/ufshcd-pci.c b/drivers/ufs/host/ufshcd-pci.c
index ea39c5d5b8cf..9cfcaad23cf9 100644
--- a/drivers/ufs/host/ufshcd-pci.c
+++ b/drivers/ufs/host/ufshcd-pci.c
@@ -562,7 +562,6 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
pm_runtime_forbid(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
ufshcd_remove(hba);
- ufshcd_dealloc_host(hba);
}
/**
@@ -605,7 +604,6 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
err = ufshcd_init(hba, mmio_base, pdev->irq);
if (err) {
dev_err(&pdev->dev, "Initialization failed\n");
- ufshcd_dealloc_host(hba);
return err;
}
diff --git a/drivers/ufs/host/ufshcd-pltfrm.c b/drivers/ufs/host/ufshcd-pltfrm.c
index 505572d4fa87..adb0a65d9df5 100644
--- a/drivers/ufs/host/ufshcd-pltfrm.c
+++ b/drivers/ufs/host/ufshcd-pltfrm.c
@@ -488,13 +488,13 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
if (err) {
dev_err(dev, "%s: clock parse failed %d\n",
__func__, err);
- goto dealloc_host;
+ goto out;
}
err = ufshcd_parse_regulator_info(hba);
if (err) {
dev_err(dev, "%s: regulator init failed %d\n",
__func__, err);
- goto dealloc_host;
+ goto out;
}
ufshcd_init_lanes_per_dir(hba);
@@ -502,14 +502,14 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
err = ufshcd_parse_operating_points(hba);
if (err) {
dev_err(dev, "%s: OPP parse failed %d\n", __func__, err);
- goto dealloc_host;
+ goto out;
}
err = ufshcd_init(hba, mmio_base, irq);
if (err) {
dev_err_probe(dev, err, "Initialization failed with error %d\n",
err);
- goto dealloc_host;
+ goto out;
}
pm_runtime_set_active(dev);
@@ -517,8 +517,6 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
return 0;
-dealloc_host:
- ufshcd_dealloc_host(hba);
out:
return err;
}
@@ -534,7 +532,6 @@ void ufshcd_pltfrm_remove(struct platform_device *pdev)
pm_runtime_get_sync(&pdev->dev);
ufshcd_remove(hba);
- ufshcd_dealloc_host(hba);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
}
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index da0fa5c65081..58eb6e897827 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1311,7 +1311,6 @@ static inline void ufshcd_rmwl(struct ufs_hba *hba, u32 mask, u32 val, u32 reg)
void ufshcd_enable_irq(struct ufs_hba *hba);
void ufshcd_disable_irq(struct ufs_hba *hba);
int ufshcd_alloc_host(struct device *, struct ufs_hba **);
-void ufshcd_dealloc_host(struct ufs_hba *);
int ufshcd_hba_enable(struct ufs_hba *hba);
int ufshcd_init(struct ufs_hba *, void __iomem *, unsigned int);
int ufshcd_link_recovery(struct ufs_hba *hba);
---
base-commit: 4e16367cfe0ce395f29d0482b78970cce8e1db73
change-id: 20250113-ufshcd-fix-52409f2d32ff
Best regards,
--
André Draszik <andre.draszik@...aro.org>
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