linux-kernel - [RFC PATCH v4 25/37] arm64: bpf: Skip validation of ___bpf_prog

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Date:   Fri, 29 Apr 2022 17:43:43 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arch@...r.kernel.org>
CC:     <jthierry@...hat.com>, <catalin.marinas@....com>,
        <will@...nel.org>, <masahiroy@...nel.org>, <jpoimboe@...hat.com>,
        <peterz@...radead.org>, <ycote@...hat.com>,
        <herbert@...dor.apana.org.au>, <mark.rutland@....com>,
        <davem@...emloft.net>, <ardb@...nel.org>, <maz@...nel.org>,
        <tglx@...utronix.de>, <luc.vanoostenryck@...il.com>,
        <chenzhongjin@...wei.com>
Subject: [RFC PATCH v4 25/37] arm64: bpf: Skip validation of ___bpf_prog_run

There is a jump table encoded in ___bpf_prog_run and objtool-arm64
can't deal with it now. Skip validate it for arm64.

Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 kernel/bpf/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 13e9dbeeedf3..d702f1d83176 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -2022,6 +2022,9 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn)
 		BUG_ON(1);
 		return 0;
 }
+#ifdef CONFIG_ARM64
+STACK_FRAME_NON_STANDARD(___bpf_prog_run);
+#endif
 
 #define PROG_NAME(stack_size) __bpf_prog_run##stack_size
 #define DEFINE_BPF_PROG_RUN(stack_size) \
-- 
2.17.1