CVE-2022-49873
bpf: Fix wrong reg type conversion in release_reference()
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bpf: Fix wrong reg type conversion in release_reference()
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory. To avoid memory leaks, the verifier requires the eBPF program to release these memories by calling the corresponding helper functions. When a resource is released, all pointer registers corresponding to the resource should be invalidated. The verifier use release_references() to do this job, by apply __mark_reg_unknown() to each relevant register. It will give these registers the type of SCALAR_VALUE. A register that will contain a pointer value at runtime, but of type SCALAR_VALUE, which may allow the unprivileged user to get a kernel pointer by storing this register into a map. Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this problem.
Reserved 2025-05-01 | Published 2025-05-01 | Updated 2025-05-04 | Assigner Linuxgit.kernel.org/...c/cedd4f01f67be94735f15123158f485028571037
git.kernel.org/...c/466ce46f251dfb259a8cbaa895ab9edd6fb56240
git.kernel.org/...c/ae5ccad6c711db0f2ca1231be051935dd128b8f5
git.kernel.org/...c/f1db20814af532f85e091231223e5e4818e8464b
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