From: Hari Bathini <hbathini@linux.ibm.com>
To: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, bpf@vger.kernel.org
Cc: Song Liu <songliubraving@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>, Song Liu <song@kernel.org>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Subject: [PATCH v7 3/5] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack
Date: Fri, 20 Oct 2023 19:43:56 +0530 [thread overview]
Message-ID: <20231020141358.643575-4-hbathini@linux.ibm.com> (raw)
In-Reply-To: <20231020141358.643575-1-hbathini@linux.ibm.com>
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: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Song Liu <song@kernel.org>
---
* No changes in v7.
arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index c740eac8d584..ecd7cffbbe28 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -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;
+}
--
2.41.0
next prev parent reply other threads:[~2023-10-20 14:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-20 14:13 [PATCH v7 0/5] powerpc/bpf: use BPF prog pack allocator Hari Bathini
2023-10-20 14:13 ` [PATCH v7 1/5] powerpc/code-patching: introduce patch_instructions() Hari Bathini
2023-10-30 13:02 ` Aneesh Kumar K.V
2023-10-30 18:56 ` Hari Bathini
2023-10-20 14:13 ` [PATCH v7 2/5] powerpc/bpf: implement bpf_arch_text_copy Hari Bathini
2023-10-20 14:13 ` Hari Bathini [this message]
2023-10-20 14:13 ` [PATCH v7 4/5] powerpc/bpf: rename powerpc64_jit_data to powerpc_jit_data Hari Bathini
2023-10-20 14:13 ` [PATCH v7 5/5] powerpc/bpf: use bpf_jit_binary_pack_[alloc|finalize|free] Hari Bathini
2023-10-27 9:59 ` [PATCH v7 0/5] powerpc/bpf: use BPF prog pack allocator Michael Ellerman
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