| Message ID | 20240417145646.793223-1-ashutosh.dixit@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915/hwmon: Get rid of devm | expand |
Hi Ashutosh, On Wed, Apr 17, 2024 at 07:56:46AM -0700, Ashutosh Dixit wrote: > When both hwmon and hwmon drvdata (on which hwmon depends) are device > managed resources, the expectation, on device unbind, is that hwmon will be > released before drvdata. However, in i915 there are two separate code > paths, which both release either drvdata or hwmon and either can be > released before the other. These code paths (for device unbind) are as > follows (see also the bug referenced below): > > Call Trace: > release_nodes+0x11/0x70 > devres_release_group+0xb2/0x110 > component_unbind_all+0x8d/0xa0 > component_del+0xa5/0x140 > intel_pxp_tee_component_fini+0x29/0x40 [i915] > intel_pxp_fini+0x33/0x80 [i915] > i915_driver_remove+0x4c/0x120 [i915] > i915_pci_remove+0x19/0x30 [i915] > pci_device_remove+0x32/0xa0 > device_release_driver_internal+0x19c/0x200 > unbind_store+0x9c/0xb0 > > and > > Call Trace: > release_nodes+0x11/0x70 > devres_release_all+0x8a/0xc0 > device_unbind_cleanup+0x9/0x70 > device_release_driver_internal+0x1c1/0x200 > unbind_store+0x9c/0xb0 > > This means that in i915, if use devm, we cannot gurantee that hwmon will > always be released before drvdata. Which means that we have a uaf if hwmon > sysfs is accessed when drvdata has been released but hwmon hasn't. > > The only way out of this seems to be do get rid of devm_ and release/free > everything explicitly during device unbind. > > v2: Change commit message and other minor code changes > v3: Cleanup from i915_hwmon_register on error (Armin Wolf) > v4: Eliminate potential static analyzer warning (Rodrigo) > Eliminate fetch_and_zero (Jani) > v5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi) Thanks! Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Andi
On Thu, 18 Apr 2024 14:56:58 -0700, Andi Shyti wrote: > > > v2: Change commit message and other minor code changes > > v3: Cleanup from i915_hwmon_register on error (Armin Wolf) > > v4: Eliminate potential static analyzer warning (Rodrigo) > > Eliminate fetch_and_zero (Jani) > > v5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi) > > Thanks! > > Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Thanks a lot Andi, merged! Ashutosh
diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index b758fd110c20..c0662a022f59 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -793,7 +793,7 @@ void i915_hwmon_register(struct drm_i915_private *i915) if (!IS_DGFX(i915)) return; - hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL); + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); if (!hwmon) return; @@ -819,14 +819,12 @@ void i915_hwmon_register(struct drm_i915_private *i915) hwm_get_preregistration_info(i915); /* hwmon_dev points to device hwmon<i> */ - hwmon_dev = devm_hwmon_device_register_with_info(dev, ddat->name, - ddat, - &hwm_chip_info, - hwm_groups); - if (IS_ERR(hwmon_dev)) { - i915->hwmon = NULL; - return; - } + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, + ddat, + &hwm_chip_info, + hwm_groups); + if (IS_ERR(hwmon_dev)) + goto err; ddat->hwmon_dev = hwmon_dev; @@ -839,16 +837,36 @@ void i915_hwmon_register(struct drm_i915_private *i915) if (!hwm_gt_is_visible(ddat_gt, hwmon_energy, hwmon_energy_input, 0)) continue; - hwmon_dev = devm_hwmon_device_register_with_info(dev, ddat_gt->name, - ddat_gt, - &hwm_gt_chip_info, - NULL); + hwmon_dev = hwmon_device_register_with_info(dev, ddat_gt->name, + ddat_gt, + &hwm_gt_chip_info, + NULL); if (!IS_ERR(hwmon_dev)) ddat_gt->hwmon_dev = hwmon_dev; } + return; +err: + i915_hwmon_unregister(i915); } void i915_hwmon_unregister(struct drm_i915_private *i915) { - fetch_and_zero(&i915->hwmon); + struct i915_hwmon *hwmon = i915->hwmon; + struct intel_gt *gt; + int i; + + if (!hwmon) + return; + + for_each_gt(gt, i915, i) + if (hwmon->ddat_gt[i].hwmon_dev) + hwmon_device_unregister(hwmon->ddat_gt[i].hwmon_dev); + + if (hwmon->ddat.hwmon_dev) + hwmon_device_unregister(hwmon->ddat.hwmon_dev); + + mutex_destroy(&hwmon->hwmon_lock); + + kfree(i915->hwmon); + i915->hwmon = NULL; }
When both hwmon and hwmon drvdata (on which hwmon depends) are device managed resources, the expectation, on device unbind, is that hwmon will be released before drvdata. However, in i915 there are two separate code paths, which both release either drvdata or hwmon and either can be released before the other. These code paths (for device unbind) are as follows (see also the bug referenced below): Call Trace: release_nodes+0x11/0x70 devres_release_group+0xb2/0x110 component_unbind_all+0x8d/0xa0 component_del+0xa5/0x140 intel_pxp_tee_component_fini+0x29/0x40 [i915] intel_pxp_fini+0x33/0x80 [i915] i915_driver_remove+0x4c/0x120 [i915] i915_pci_remove+0x19/0x30 [i915] pci_device_remove+0x32/0xa0 device_release_driver_internal+0x19c/0x200 unbind_store+0x9c/0xb0 and Call Trace: release_nodes+0x11/0x70 devres_release_all+0x8a/0xc0 device_unbind_cleanup+0x9/0x70 device_release_driver_internal+0x1c1/0x200 unbind_store+0x9c/0xb0 This means that in i915, if use devm, we cannot gurantee that hwmon will always be released before drvdata. Which means that we have a uaf if hwmon sysfs is accessed when drvdata has been released but hwmon hasn't. The only way out of this seems to be do get rid of devm_ and release/free everything explicitly during device unbind. v2: Change commit message and other minor code changes v3: Cleanup from i915_hwmon_register on error (Armin Wolf) v4: Eliminate potential static analyzer warning (Rodrigo) Eliminate fetch_and_zero (Jani) v5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi) Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10366 Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> --- drivers/gpu/drm/i915/i915_hwmon.c | 46 +++++++++++++++++++++---------- 1 file changed, 32 insertions(+), 14 deletions(-)