netdev - [PATCH] powerpc/bpf: fix write protecting JIT code

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Date:   Mon, 25 Oct 2021 11:26:49 +0530
From:   Hari Bathini <hbathini@...ux.ibm.com>
To:     naveen.n.rao@...ux.ibm.com, jniethe5@...il.com,
        christophe.leroy@...roup.eu, mpe@...erman.id.au, ast@...nel.org,
        daniel@...earbox.net
Cc:     paulus@...ba.org, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, netdev@...r.kernel.org, bpf@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        Hari Bathini <hbathini@...ux.ibm.com>, stable@...r.kernel.org
Subject: [PATCH] powerpc/bpf: fix write protecting JIT code

Running program with bpf-to-bpf function calls results in data access
exception (0x300) with the below call trace:

    [c000000000113f28] bpf_int_jit_compile+0x238/0x750 (unreliable)
    [c00000000037d2f8] bpf_check+0x2008/0x2710
    [c000000000360050] bpf_prog_load+0xb00/0x13a0
    [c000000000361d94] __sys_bpf+0x6f4/0x27c0
    [c000000000363f0c] sys_bpf+0x2c/0x40
    [c000000000032434] system_call_exception+0x164/0x330
    [c00000000000c1e8] system_call_vectored_common+0xe8/0x278

as bpf_int_jit_compile() tries writing to write protected JIT code
location during the extra pass.

Fix it by holding off write protection of JIT code until the extra
pass, where branch target addresses fixup happens.

Cc: stable@...r.kernel.org
Fixes: 62e3d4210ac9 ("powerpc/bpf: Write protect JIT code")
Signed-off-by: Hari Bathini <hbathini@...ux.ibm.com>
---
 arch/powerpc/net/bpf_jit_comp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index fcbf7a917c56..90ce75f0f1e2 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -241,8 +241,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
 	fp->jited_len = alloclen;
 
 	bpf_flush_icache(bpf_hdr, (u8 *)bpf_hdr + (bpf_hdr->pages * PAGE_SIZE));
-	bpf_jit_binary_lock_ro(bpf_hdr);
 	if (!fp->is_func || extra_pass) {
+		bpf_jit_binary_lock_ro(bpf_hdr);
 		bpf_prog_fill_jited_linfo(fp, addrs);
 out_addrs:
 		kfree(addrs);
-- 
2.31.1