Netdev Archive on lore.kernel.org
 help / color / Atom feed
From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Ilya Maximets <i.maximets@ovn.org>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"David S . Miller" <davem@davemloft.net>,
	Jonathan Lemon <jonathan.lemon@gmail.com>
Subject: Re: [PATCH bpf] libbpf: fix passing uninitialized bytes to setsockopt
Date: Sat, 12 Oct 2019 21:59:26 -0700
Message-ID: <CAADnVQLczRWyWa44+ogr1UkcOObA40zurwxMY=0hO9_1Y1yeDA@mail.gmail.com> (raw)
In-Reply-To: <5da2ad7f.1c69fb81.2ed87.f547SMTPIN_ADDED_BROKEN@mx.google.com>

On Sat, Oct 12, 2019 at 9:52 PM Ilya Maximets <i.maximets@ovn.org> wrote:
>
> 'struct xdp_umem_reg' has 4 bytes of padding at the end that makes
> valgrind complain about passing uninitialized stack memory to the
> syscall:
>
>   Syscall param socketcall.setsockopt() points to uninitialised byte(s)
>     at 0x4E7AB7E: setsockopt (in /usr/lib64/libc-2.29.so)
>     by 0x4BDE035: xsk_umem__create@@LIBBPF_0.0.4 (xsk.c:172)
>   Uninitialised value was created by a stack allocation
>     at 0x4BDDEBA: xsk_umem__create@@LIBBPF_0.0.4 (xsk.c:140)
>
> Padding bytes appeared after introducing of a new 'flags' field.
>
> Fixes: 10d30e301732 ("libbpf: add flags to umem config")
> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

Something is not right with (e|g)mail.
This is 3rd email I got with the same patch.
First one (the one that was applied) was 3 days ago.

       reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <5da2ad7f.1c69fb81.2ed87.f547SMTPIN_ADDED_BROKEN@mx.google.com>
2019-10-13  4:59 ` Alexei Starovoitov [this message]
2019-10-13 10:01   ` Ilya Maximets
2019-10-09 15:42 Ilya Maximets
2019-10-09 16:29 ` Andrii Nakryiko
2019-10-09 16:39   ` Ilya Maximets

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAADnVQLczRWyWa44+ogr1UkcOObA40zurwxMY=0hO9_1Y1yeDA@mail.gmail.com' \
    --to=alexei.starovoitov@gmail.com \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=davem@davemloft.net \
    --cc=i.maximets@ovn.org \
    --cc=jonathan.lemon@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Netdev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/netdev/0 netdev/git/0.git
	git clone --mirror https://lore.kernel.org/netdev/1 netdev/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 netdev netdev/ https://lore.kernel.org/netdev \
		netdev@vger.kernel.org netdev@archiver.kernel.org
	public-inbox-index netdev

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.netdev


AGPL code for this site: git clone https://public-inbox.org/ public-inbox