Linux kernel ieee802154 hwsim driver double-free vulnerability analysis

Vulnerability Overview This vulnerability involves the module within the Linux kernel, specifically an unserialized read-write-free issue in the driver when handling updates. When worker threads invoke via without holding the RTNL lock, race conditions may occur, leading to a double-free error. Impact Scope Module: Driver: Kernel Versions: Based on the provided information, the vulnerability exists in the stable branches of . The specific version is not explicitly stated, but the patch submission date was 2020-10-03. Remediation Plan 1. Add Locking Mechanism: Introduce a lock for within the driver to ensure atomic operations during updates. 2. Use : Utilize when updating to safely replace pointers and avoid race conditions. 3. Code Modifications: - Add and to the function to protect updates. - Use to safely replace pointers. Code Snippet ```c / Serializes phy->pib updates. / spinlock_t pib_lock; struct hwsim_pib __rcu pib; bool suspended; @ -102.8 +104.0 @ static int hwsim_update_pib(struct ieee802154_hw hw, u8 page, u8 channel, if (pib) return -ENOMEM; pib_old = rtnl_dereference(phy->pib); pib->page = page; pib->channel = channel; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->filt_short_addr = filt->short_addr; pib->filt_long_addr = filt->long_addr; pib->filt_pan_id = filt->pan_id; pib->fil

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Linux kernel ieee802154 hwsim driver double-free vulnerability analysis

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