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bpf, btf: Enforce destructor kfunc type with CFI

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Ensure that registered destructor kfuncs have the same type
as btf_dtor_kfunc_t to avoid a kernel panic on systems with
CONFIG_CFI enabled.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260110082548.113748-10-samitolvanen@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Sami Tolvanen 2026-01-10 08:25:53 +00:00 committed by Alexei Starovoitov
parent ba7f1024a1
commit 99fde4d062
1 changed files with 7 additions and 0 deletions
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7
kernel/bpf/btf.c
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@ -8846,6 +8846,13 @@ static int btf_check_dtor_kfuncs(struct btf *btf, const struct btf_id_dtor_kfunc
*/
if (!t || !btf_type_is_ptr(t))
return -EINVAL;
if (IS_ENABLED(CONFIG_CFI_CLANG)) {
/* Ensure the destructor kfunc type matches btf_dtor_kfunc_t */
t = btf_type_by_id(btf, t->type);
if (!btf_type_is_void(t))
return -EINVAL;
}
}
return 0;
}