Support kCFI + BPF on arm64 #8894
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Currently x86 and riscv open-code 4 instances of the same logic to define a u32 variable with the KCFI typeid of a given function. Replace the duplicate logic with a common macro. Signed-off-by: Mark Rutland <[email protected]> Co-developed-by: Maxwell Bland <[email protected]> Signed-off-by: Maxwell Bland <[email protected]> Co-developed-by: Sami Tolvanen <[email protected]> Signed-off-by: Sami Tolvanen <[email protected]> Tested-by: Dao Huang <[email protected]>
Currently, bpf_dispatcher_*_func() is marked with `__nocfi` therefore calling BPF programs from this interface doesn't cause CFI warnings. When BPF programs are called directly from C: from BPF helpers or struct_ops, CFI warnings are generated. Implement proper CFI prologues for the BPF programs and callbacks and drop __nocfi for arm64. Fix the trampoline generation code to emit kCFI prologue when a struct_ops trampoline is being prepared. Signed-off-by: Puranjay Mohan <[email protected]> Co-developed-by: Maxwell Bland <[email protected]> Signed-off-by: Maxwell Bland <[email protected]> Co-developed-by: Sami Tolvanen <[email protected]> Signed-off-by: Sami Tolvanen <[email protected]> Tested-by: Dao Huang <[email protected]>
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Pull request for series with
subject: Support kCFI + BPF on arm64
version: 9
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=959802