Description: bpf: reject passing modified ctx to helper functions References: https://source.android.com/security/bulletin/pixel/2020-09-01 Notes: Bugs: upstream: released (4.18-rc1) [58990d1ff3f7896ee341030e9a7c2e4002570683] 4.19-upstream-stable: N/A "Fixed before branching point" 4.9-upstream-stable: N/A "Vulnerable code introduced later in 4.14-rc1" sid: released (4.17.8-1) 4.19-buster-security: N/A "Fixed before branching point" 4.9-stretch-security: N/A "Vulnerable code introduced later"