linux-kernel - [PATCH v7 bpf-next 4/9] bpf: use prog->jited_len in bpf_prog_ksym_set

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Date:   Fri, 28 Jan 2022 15:45:12 -0800
From:   Song Liu <song@...nel.org>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kernel-team@...com>, <peterz@...radead.org>, <x86@...nel.org>,
        <iii@...ux.ibm.com>, Song Liu <song@...nel.org>
Subject: [PATCH v7 bpf-next 4/9] bpf: use prog->jited_len in  bpf_prog_ksym_set_addr()

Using prog->jited_len is simpler and more accurate than current
estimation (header + header->size).

Signed-off-by: Song Liu <song@...nel.org>
---
 kernel/bpf/core.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 69f348d9f816..7cbcf6bfbb52 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -537,13 +537,10 @@ long bpf_jit_limit_max __read_mostly;
 static void
 bpf_prog_ksym_set_addr(struct bpf_prog *prog)
 {
-	const struct bpf_binary_header *hdr = bpf_jit_binary_hdr(prog);
-	unsigned long addr = (unsigned long)hdr;
-
 	WARN_ON_ONCE(!bpf_prog_ebpf_jited(prog));
 
 	prog->aux->ksym.start = (unsigned long) prog->bpf_func;
-	prog->aux->ksym.end   = addr + hdr->size;
+	prog->aux->ksym.end   = prog->aux->ksym.start + prog->jited_len;
 }
 
 static void
-- 
2.30.2