CVE-2022-50870
Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/rtas: avoid device tree lookups in rtas_os_term() rtas_os_term() is called during panic. Its behavior depends on a couple of conditions in the /rtas node of the device tree, the traversal of which entails locking and local IRQ state changes. If the kernel panics while devtree_lock is held, rtas_os_term() as currently written could hang. Instead of discovering the relevant characteristics at panic time, cache them in file-static variables at boot. Note the lookup for "ibm,extended-os-term" is converted to of_property_read_bool() since it is a boolean property, not an RTAS function token. [mpe: Incorporate suggested change from Nick]
How to fix
- Linux Linuxe23822c7381c59d9e42e65771b6e17c71ed30ea7, 06a07fbb32b3a23eec20a42b1e64474da0a3b33e, c2fa91abf22a705cf02f886cd99cff41f4ceda60, f2167f10fcca68ab9ae3f8d94d2c704c5541ac69, d8939315b7342860df143afe0adda6212cdd3193, 698e682c849e356fb47a8be47ca8baa817cf31e0, 464d10e8d797454e16a173ef1292a446b2adf21c, ed2213bfb192ab51f09f12e9b49b5d482c6493f3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 088186ded490ced80758200cf8f906ed741df306 ≤ v < e23822c7381c59d9e42e65771b6e17c71ed30ea7, 088186ded490ced80758200cf8f906ed741df306 ≤ v < 06a07fbb32b3a23eec20a42b1e64474da0a3b33e, 088186ded490ced80758200cf8f906ed741df306 ≤ v < c2fa91abf22a705cf02f886cd99cff41f4ceda60, 088186ded490ced80758200cf8f906ed741df306 ≤ v < f2167f10fcca68ab9ae3f8d94d2c704c5541ac69, 088186ded490ced80758200cf8f906ed741df306 ≤ v < d8939315b7342860df143afe0adda6212cdd3193, 088186ded490ced80758200cf8f906ed741df306 ≤ v < 698e682c849e356fb47a8be47ca8baa817cf31e0, 088186ded490ced80758200cf8f906ed741df306 ≤ v < 464d10e8d797454e16a173ef1292a446b2adf21c, 088186ded490ced80758200cf8f906ed741df306 ≤ v < ed2213bfb192ab51f09f12e9b49b5d482c6493f3, 2.6.16 | e23822c7381c59d9e42e65771b6e17c71ed30ea7, 06a07fbb32b3a23eec20a42b1e64474da0a3b33e, c2fa91abf22a705cf02f886cd99cff41f4ceda60, f2167f10fcca68ab9ae3f8d94d2c704c5541ac69, d8939315b7342860df143afe0adda6212cdd3193, 698e682c849e356fb47a8be47ca8baa817cf31e0, 464d10e8d797454e16a173ef1292a446b2adf21c, ed2213bfb192ab51f09f12e9b49b5d482c6493f3 |
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