Commit 033ffaf0 authored by Hari Bathini's avatar Hari Bathini Committed by Michael Ellerman
Browse files

powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack 



Implement bpf_arch_text_invalidate and use it to fill unused part of
the bpf_prog_pack with trap instructions when a BPF program is freed.

Signed-off-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Acked-by: default avatarSong Liu <song@kernel.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231020141358.643575-4-hbathini@linux.ibm.com
parent 6efc1675

arch/powerpc/net/bpf_jit_comp.c

+15 −0
Original line number Diff line number Diff line
@@ -292,3 +292,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) 


	return err ? ERR_PTR(err) : dst;

}



int bpf_arch_text_invalidate(void *dst, size_t len)

{

	u32 insn = BREAKPOINT_INSTRUCTION;

	int ret;



	if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst)))

		return -EINVAL;



	mutex_lock(&text_mutex);

	ret = patch_instructions(dst, &insn, len, true);

	mutex_unlock(&text_mutex);



	return ret;

}