CVE-2022-50206 — arm64: fix oops in concurrently setting insn_emulation sysctls

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

arm64: fix oops in concurrently setting insn_emulation sysctls

emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself:

To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.

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CVE-2022-50206 — arm64: fix oops in concurrently setting insn_emulation sysctls