Re: [PATCH bpf-next v3 1/4] bpf: crypto: Use the correct destructor kfunc type
From: Yonghong Song <yonghong.song@linux.dev>
Date: 2025-07-28 23:08:09
Also in:
bpf, lkml
On 7/28/25 1:26 PM, Sami Tolvanen wrote:
With CONFIG_CFI_CLANG enabled, the kernel strictly enforces that
indirect function calls use a function pointer type that matches the
target function. I ran into the following type mismatch when running
BPF self-tests:
CFI failure at bpf_obj_free_fields+0x190/0x238 (target:
bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc)
Internal error: Oops - CFI: 00000000f2008228 [#1] SMP
...
As bpf_crypto_ctx_release() is also used in BPF programs and using
a void pointer as the argument would make the verifier unhappy, add
a simple stub function with the correct type and register it as the
destructor kfunc instead.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>Acked-by: Yonghong Song <yonghong.song@linux.dev>