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| author | ChiYuan Huang <cy_huang@richtek.com> | 2022-12-06 10:22:21 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-12-08 16:02:37 +0300 |
| commit | 8f3cbcd6b440032ebc7f7d48a1689dcc70a4eb98 (patch) | |
| tree | f132fd4e1de3e7dc4990b6b5609ed701a91ce979 /drivers/regulator/of_regulator.c | |
| parent | 2a17ddfdca25ac4cbb0d317362608ec32f98fd82 (diff) | |
| download | linux-8f3cbcd6b440032ebc7f7d48a1689dcc70a4eb98.tar.xz | |
regulator: core: Use different devices for resource allocation and DT lookup
Following by the below discussion, there's the potential UAF issue
between regulator and mfd.
https://lore.kernel.org/all/20221128143601.1698148-1-yangyingliang@huawei.com/
From the analysis of Yingliang
CPU A |CPU B
mt6370_probe() |
devm_mfd_add_devices() |
|mt6370_regulator_probe()
| regulator_register()
| //allocate init_data and add it to devres
| regulator_of_get_init_data()
i2c_unregister_device() |
device_del() |
devres_release_all() |
// init_data is freed |
release_nodes() |
| // using init_data causes UAF
| regulator_register()
It's common to use mfd core to create child device for the regulator.
In order to do the DT lookup for init data, the child that registered
the regulator would pass its parent as the parameter. And this causes
init data resource allocated to its parent, not itself. The issue happen
when parent device is going to release and regulator core is still doing
some operation of init data constraint for the regulator of child device.
To fix it, this patch expand 'regulator_register' API to use the
different devices for init data allocation and DT lookup.
Reported-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1670311341-32664-1-git-send-email-u0084500@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/of_regulator.c')
| -rw-r--r-- | drivers/regulator/of_regulator.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c index f7529f1bf8b2..1b65e5e4e40f 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -505,7 +505,7 @@ struct regulator_init_data *regulator_of_get_init_data(struct device *dev, struct device_node *child; struct regulator_init_data *init_data = NULL; - child = regulator_of_get_init_node(dev, desc); + child = regulator_of_get_init_node(config->dev, desc); if (!child) return NULL; |