From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9BD8115C83 for ; Mon, 5 Dec 2022 19:23:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C163C433C1; Mon, 5 Dec 2022 19:23:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670268224; bh=qR3ecGN+bDM1sfIz4tYuS3CGvoUE56QXFPrnFibYKE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LEDCntJM51ZEanVtQxXOI70HOFHG2NHOhu0fnkqXHAA45Djc1WGNaZwMmimTRGTyF GZ9mn5iFo25NPmUszt6cmtAggnt6tlyhAHESAmbke0M+sXTIPyfCVIAMAmxEIkWGIw 5df87/NftZu3+N5QSi0T4HPYU8KFJQjHVfu7uMsE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xu Kuohai , Alexei Starovoitov , Sasha Levin Subject: [PATCH 6.0 025/124] bpf: Do not copy spin lock field from user in bpf_selem_alloc Date: Mon, 5 Dec 2022 20:08:51 +0100 Message-Id: <20221205190809.166658253@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190808.422385173@linuxfoundation.org> References: <20221205190808.422385173@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Xu Kuohai [ Upstream commit 836e49e103dfeeff670c934b7d563cbd982fce87 ] bpf_selem_alloc function is used by inode_storage, sk_storage and task_storage maps to set map value, for these map types, there may be a spin lock in the map value, so if we use memcpy to copy the whole map value from user, the spin lock field may be initialized incorrectly. Since the spin lock field is zeroed by kzalloc, call copy_map_value instead of memcpy to skip copying the spin lock field to fix it. Fixes: 6ac99e8f23d4 ("bpf: Introduce bpf sk local storage") Signed-off-by: Xu Kuohai Link: https://lore.kernel.org/r/20221114134720.1057939-2-xukuohai@huawei.com Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- kernel/bpf/bpf_local_storage.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c index d13ffb00e981..cbe918ba9035 100644 --- a/kernel/bpf/bpf_local_storage.c +++ b/kernel/bpf/bpf_local_storage.c @@ -74,7 +74,7 @@ bpf_selem_alloc(struct bpf_local_storage_map *smap, void *owner, gfp_flags | __GFP_NOWARN); if (selem) { if (value) - memcpy(SDATA(selem)->data, value, smap->map.value_size); + copy_map_value(&smap->map, SDATA(selem)->data, value); return selem; } -- 2.35.1