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Change History

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

ftrace: Fix softlockup in ftrace_module_enable

A soft lockup was observed when loading amdgpu module.
If a module has a lot of tracable functions, multiple calls
to kallsyms_lookup can spend too much time in RCU critical
section and with disabled preemption, causing kernel panic.
This is the same issue that was fixed in
commit d0b24b4e91fc ("ftrace: Prevent RCU stall on PREEMPT_VOLUNTARY
kernels") and commit 42ea22e754ba ("ftrace: Add cond_resched() to
ftrace_graph_set_hash()").

Fix it the same way by adding cond_resched() in ftrace_module_enable.

https://git.kernel.org/stable/c/4099b98203d6b33d990586542fa5beee408032a3

https://git.kernel.org/stable/c/40c8ee40e48a2c82c762539952ed8fc0571db5bf

https://git.kernel.org/stable/c/7e3c96010ade29bb340a5bdce8675f50c7f59001

https://git.kernel.org/stable/c/a1dd0abd741a8111260676da729825d6c1461a71

https://git.kernel.org/stable/c/e81e6d6d99b16dae11adbeda5c996317942a940c