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 F02D71863 for ; Wed, 28 Dec 2022 15:25:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75AD1C433D2; Wed, 28 Dec 2022 15:25:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672241143; bh=fVSjJaNKR0aJWETif8l37jwbfBwN3cYR/5VXZm1Pi1k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LVMEfUXy07JXT14ayIxHfTNb+0irxV9JWBu6OPYUpraQ5+2MCFNdS5G7V8DXpB+ic U/TYRdg9SkygqrNtWnOzyb6EnpHfpXJ5FDx1qJRm1O28lNM4kM/nNBabS2c3oYwuVo OJ7/IhKNn5sY6LHDjffksUzMShrAPaTHWhMzJ6hc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shung-Hsi Yu , Andrii Nakryiko , Sasha Levin Subject: [PATCH 6.1 0212/1146] libbpf: Deal with section with no data gracefully Date: Wed, 28 Dec 2022 15:29:11 +0100 Message-Id: <20221228144335.905462353@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144330.180012208@linuxfoundation.org> References: <20221228144330.180012208@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: Shung-Hsi Yu [ Upstream commit 35a855509e6ee3442477c8ebc6827b5b5d32a7b5 ] ELF section data pointer returned by libelf may be NULL (if section has SHT_NOBITS), so null check section data pointer before attempting to copy license and kversion section. Fixes: cb1e5e961991 ("bpf tools: Collect version and license from ELF sections") Signed-off-by: Shung-Hsi Yu Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20221012022353.7350-3-shung-hsi.yu@suse.com Signed-off-by: Sasha Levin --- tools/lib/bpf/libbpf.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index b7fac0df2612..a0d3cc39ea73 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1408,6 +1408,10 @@ static int bpf_object__check_endianness(struct bpf_object *obj) static int bpf_object__init_license(struct bpf_object *obj, void *data, size_t size) { + if (!data) { + pr_warn("invalid license section in %s\n", obj->path); + return -LIBBPF_ERRNO__FORMAT; + } /* libbpf_strlcpy() only copies first N - 1 bytes, so size + 1 won't * go over allowed ELF data section buffer */ @@ -1421,7 +1425,7 @@ bpf_object__init_kversion(struct bpf_object *obj, void *data, size_t size) { __u32 kver; - if (size != sizeof(kver)) { + if (!data || size != sizeof(kver)) { pr_warn("invalid kver section in %s\n", obj->path); return -LIBBPF_ERRNO__FORMAT; } -- 2.35.1