diff mbox series

[bpf-next,v2] arm64: bpf: fix 32bit unconditional bswap

Message ID 20240321081809.158803-1-asavkov@redhat.com (mailing list archive)
State Accepted
Commit a51cd6bf8e10793103c5870ff9e4db295a843604
Delegated to: BPF
Headers show
Series [bpf-next,v2] arm64: bpf: fix 32bit unconditional bswap | expand

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Commit Message

Artem Savkov March 21, 2024, 8:18 a.m. UTC 
In case when is64 == 1 in emit(A64_REV32(is64, dst, dst), ctx) the
generated insn reverses byte order for both high and low 32-bit words,
resuling in an incorrect swap as indicated by the jit test:

[ 9757.262607] test_bpf: #312 BSWAP 16: 0x0123456789abcdef -> 0xefcd jited:1 8 PASS
[ 9757.264435] test_bpf: #313 BSWAP 32: 0x0123456789abcdef -> 0xefcdab89 jited:1 ret 1460850314 != -271733879 (0x5712ce8a != 0xefcdab89)FAIL (1 times)
[ 9757.266260] test_bpf: #314 BSWAP 64: 0x0123456789abcdef -> 0x67452301 jited:1 8 PASS
[ 9757.268000] test_bpf: #315 BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89 jited:1 8 PASS
[ 9757.269686] test_bpf: #316 BSWAP 16: 0xfedcba9876543210 -> 0x1032 jited:1 8 PASS
[ 9757.271380] test_bpf: #317 BSWAP 32: 0xfedcba9876543210 -> 0x10325476 jited:1 ret -1460850316 != 271733878 (0xa8ed3174 != 0x10325476)FAIL (1 times)
[ 9757.273022] test_bpf: #318 BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe jited:1 7 PASS
[ 9757.274721] test_bpf: #319 BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476 jited:1 9 PASS

Fix this by forcing 32bit variant of rev32.

Fixes: 1104247f3f979 ("bpf, arm64: Support unconditional bswap")
Signed-off-by: Artem Savkov <asavkov@redhat.com>
Tested-by: Puranjay Mohan <puranjay12@gmail.com>
Acked-by: Puranjay Mohan <puranjay12@gmail.com>
---
 arch/arm64/net/bpf_jit_comp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Xu Kuohai March 21, 2024, 8:32 a.m. UTC | #1 
On 3/21/2024 4:18 PM, Artem Savkov wrote:
> In case when is64 == 1 in emit(A64_REV32(is64, dst, dst), ctx) the
> generated insn reverses byte order for both high and low 32-bit words,
> resuling in an incorrect swap as indicated by the jit test:
> 
> [ 9757.262607] test_bpf: #312 BSWAP 16: 0x0123456789abcdef -> 0xefcd jited:1 8 PASS
> [ 9757.264435] test_bpf: #313 BSWAP 32: 0x0123456789abcdef -> 0xefcdab89 jited:1 ret 1460850314 != -271733879 (0x5712ce8a != 0xefcdab89)FAIL (1 times)
> [ 9757.266260] test_bpf: #314 BSWAP 64: 0x0123456789abcdef -> 0x67452301 jited:1 8 PASS
> [ 9757.268000] test_bpf: #315 BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89 jited:1 8 PASS
> [ 9757.269686] test_bpf: #316 BSWAP 16: 0xfedcba9876543210 -> 0x1032 jited:1 8 PASS
> [ 9757.271380] test_bpf: #317 BSWAP 32: 0xfedcba9876543210 -> 0x10325476 jited:1 ret -1460850316 != 271733878 (0xa8ed3174 != 0x10325476)FAIL (1 times)
> [ 9757.273022] test_bpf: #318 BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe jited:1 7 PASS
> [ 9757.274721] test_bpf: #319 BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476 jited:1 9 PASS
> 
> Fix this by forcing 32bit variant of rev32.
> 
> Fixes: 1104247f3f979 ("bpf, arm64: Support unconditional bswap")
> Signed-off-by: Artem Savkov <asavkov@redhat.com>
> Tested-by: Puranjay Mohan <puranjay12@gmail.com>
> Acked-by: Puranjay Mohan <puranjay12@gmail.com>
> ---
>   arch/arm64/net/bpf_jit_comp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
> index c5b461dda4385..c3ededd23cbf6 100644
> --- a/arch/arm64/net/bpf_jit_comp.c
> +++ b/arch/arm64/net/bpf_jit_comp.c
> @@ -943,7 +943,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
>   			emit(A64_UXTH(is64, dst, dst), ctx);
>   			break;
>   		case 32:
> -			emit(A64_REV32(is64, dst, dst), ctx);
> +			emit(A64_REV32(0, dst, dst), ctx);
>   			/* upper 32 bits already cleared */
>   			break;
>   		case 64:

Acked-by: Xu Kuohai <xukuohai@huawei.com>
patchwork-bot+netdevbpf@kernel.org March 21, 2024, 11 a.m. UTC | #2 
Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Thu, 21 Mar 2024 09:18:09 +0100 you wrote:
> In case when is64 == 1 in emit(A64_REV32(is64, dst, dst), ctx) the
> generated insn reverses byte order for both high and low 32-bit words,
> resuling in an incorrect swap as indicated by the jit test:
> 
> [ 9757.262607] test_bpf: #312 BSWAP 16: 0x0123456789abcdef -> 0xefcd jited:1 8 PASS
> [ 9757.264435] test_bpf: #313 BSWAP 32: 0x0123456789abcdef -> 0xefcdab89 jited:1 ret 1460850314 != -271733879 (0x5712ce8a != 0xefcdab89)FAIL (1 times)
> [ 9757.266260] test_bpf: #314 BSWAP 64: 0x0123456789abcdef -> 0x67452301 jited:1 8 PASS
> [ 9757.268000] test_bpf: #315 BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89 jited:1 8 PASS
> [ 9757.269686] test_bpf: #316 BSWAP 16: 0xfedcba9876543210 -> 0x1032 jited:1 8 PASS
> [ 9757.271380] test_bpf: #317 BSWAP 32: 0xfedcba9876543210 -> 0x10325476 jited:1 ret -1460850316 != 271733878 (0xa8ed3174 != 0x10325476)FAIL (1 times)
> [ 9757.273022] test_bpf: #318 BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe jited:1 7 PASS
> [ 9757.274721] test_bpf: #319 BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476 jited:1 9 PASS
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2] arm64: bpf: fix 32bit unconditional bswap
    https://git.kernel.org/bpf/bpf/c/a51cd6bf8e10

You are awesome, thank you!
diff mbox series

Patch

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index c5b461dda4385..c3ededd23cbf6 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -943,7 +943,7 @@  static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
 			emit(A64_UXTH(is64, dst, dst), ctx);
 			break;
 		case 32:
-			emit(A64_REV32(is64, dst, dst), ctx);
+			emit(A64_REV32(0, dst, dst), ctx);
 			/* upper 32 bits already cleared */
 			break;
 		case 64: