From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792814411; b=zZkbDw6rk/BvIrfmCznaKCFenLWQ3ge4TY+rpHsttC16JrYZjcDIvt1d2oIKYIQ2ZroD O2BxUNx9JRojhcGKFBUNXnsfWs15kXSA6ieeCdJdckcNlCerz0xpu17RMldbZUNIhrSHn D2K7JWSTRAXHfbhGul0cf8k5Ldp+SH8vF0JYDgGr46tqRjtkZ2A/uLTOW3nysWV431x9j ymjgShdt5KKkEzDM8r44lbB3mhx9Ju5eugvHkd5sLYRBuedELOVMwbFOkoAAlc3imZmRU pAQabygXOZ87Q5oNeYexrxGfCIqFpmz3kT/BCrTU6CqKGm0cwdLnFERRz9ThN+19zwQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792814411; h=Received:DKIM-Signature:Received:Content-Type:MIME-Version: Content-Transfer-Encoding:Subject:From:Message-Id:Date:References: In-Reply-To:To:Cc; bh=pj7x8YuGt0pgB1PYOp/bih6oBnaUdEGTISR4jtMdBN4=; b=A1zKuAb9NRoeM7p4YIPFEeEf2hAXbLAUrtZ4asRCx3X1iJa/DiTqVYxvXpDgqw6DDlWb 6XT9tW42B6jIzFEYgOnrx6mHSA3cacxuql7x9nxsd8LYIRaWOzc0vKXFwOOCj9PvvYGJi XqNms2XJ/lOouf+w/3n3lWH1on7nn0T/L2l1vk0yXEv6xZvtnyYmMH3amVY30fpMM/aft 50Bvwk1CrRxQFmng32w1MuZZ4J15eZJJlZwqzXWWDUHudf7jpuYlG4WeWBS6At+W4wxyN 5ayCx38gH1NWXES3RWUB/K1iEXS2ji2MvMnGiT2W7OZIAHd9brP5Qhc8jOL04mtS42A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="Ot2D/KNE"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B679D606A31E; Sat, 24 Oct 2026 04:00:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Ot2D/KNE Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C2EB1F01825; Sat, 24 Oct 2026 04:00:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792814410; bh=pj7x8YuGt0pgB1PYOp/bih6oBnaUdEGTISR4jtMdBN4=; h=Subject:From:Date:References:In-Reply-To:To:Cc; b=Ot2D/KNEoZj54uqTVWQUdMayibFXqRBGxHlxp7YVwLTgVWqEv9ligngi8nqTwtlL0 mu6Db4VEQRZ/BxZEixBTzKt53vGgjPnaDZPg3nPnTielem7FsE585j9fffkTBndeOa QJOfVYQy5DVae+iAv0CQk20IU8QUKcUXXQ5WHZdgQyUQAQPAqhDtmZf92EghOiAuop LzJMyAzj5kv128qo8MREDSkf/rZTIZwwTfxQveHyHRMKyF8SSUEa+CEZpxmU1Sj9Rb 5UI8RfLsO0LYaplpwaXo7vIqOPODUG15BehQIaMVDh06ZEAuybdJQeGJ153J48ftf4 jEQjPVN+AJ9GA== Received: from [10.30.226.235] (localhost [IPv6:::1]) by aws-us-west-2-korg-oddjob-rhel9-1.codeaurora.org (Postfix) with ESMTP id 815F0391B17A; Sat, 24 Oct 2026 04:00:10 +0000 (UTC) Content-Type: text/plain; charset="utf-8" X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH bpf-next v2] bpf: Use memmove() to load bytes from an skb and an xdp_buff From: patchwork-bot+netdevbpf@kernel.org Message-Id: <179281440907.1452471.10626063487064025333.git-patchwork-notify@kernel.org> Date: Sat, 24 Oct 2026 04:00:09 +0000 References: <20261022112312.31563-1-ayushmanrout27@gmail.com> In-Reply-To: <20261022112312.31563-1-ayushmanrout27@gmail.com> To: Ayushman Rout Cc: bpf@vger.kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, sdf@fomichev.me, martin.lau@linux.dev, ast@kernel.org, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, hawk@kernel.org, drosen@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Hello: This patch was applied to bpf/bpf.git (master) by Alexei Starovoitov : On Thu, 22 Oct 2026 16:53:11 +0530 you wrote: > bpf_dynptr_read() on an skb or xdp dynptr ends in bpf_skb_load_bytes() > or bpf_xdp_load_bytes(). The destination can be a slice of the same > packet, so it can overlap the source, which memcpy() does not allow. > On x86 with FSRM memcpy() copies forward, so a destination above the > source gets the first bytes repeated: > > p = bpf_dynptr_slice_rdwr(&ptr, 8, NULL, 64); > bpf_dynptr_read(p, 64, &ptr, 0, 0); > > [...] Here is the summary with links: - [bpf-next,v2] bpf: Use memmove() to load bytes from an skb and an xdp_buff https://git.kernel.org/bpf/bpf/c/b93cf2c8a055 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html