From: Andrey Konovalov <andreyknvl@google.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Kees Cook <keescook@chromium.org>,
Kate Stewart <kstewart@linuxfoundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Shuah Khan <shuah@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Eric Dumazet <edumazet@google.com>,
"David S. Miller" <davem@davemloft.net>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
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netdev <netdev@vger.kernel.org>,
bpf@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Dmitry Vyukov <dvyukov@google.com>,
Kostya Serebryany <kcc@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Lee Smith <Lee.Smith@arm.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Chintan Pandya <cpandya@codeaurora.org>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Dave Martin <Dave.Martin@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Subject: Re: [PATCH v11 08/14] net, arm64: untag user pointers in tcp_zerocopy_receive
Date: Mon, 18 Mar 2019 14:16:54 +0100 [thread overview]
Message-ID: <CAAeHK+yxcG=KBjG0A5BicBA7Zwu6LR6t=g5b-9EAPXA8_Dfm2g@mail.gmail.com> (raw)
In-Reply-To: <CAAeHK+xXLypBpF1EE73KuzQAo0E6Y=apS46wo+swo2AB6cy3YA@mail.gmail.com>
On Mon, Mar 18, 2019 at 2:14 PM Andrey Konovalov <andreyknvl@google.com> wrote:
>
> On Fri, Mar 15, 2019 at 9:03 PM Eric Dumazet <eric.dumazet@gmail.com> wrote:
> >
> >
> >
> > On 03/15/2019 12:51 PM, Andrey Konovalov wrote:
> > > This patch is a part of a series that extends arm64 kernel ABI to allow to
> > > pass tagged user pointers (with the top byte set to something else other
> > > than 0x00) as syscall arguments.
> > >
> > > tcp_zerocopy_receive() uses provided user pointers for vma lookups, which
> > > can only by done with untagged pointers.
> > >
> > > Untag user pointers in this function.
> > >
> > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > > ---
> > > net/ipv4/tcp.c | 2 ++
> > > 1 file changed, 2 insertions(+)
> > >
> > > diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> > > index 6baa6dc1b13b..89db3b4fc753 100644
> > > --- a/net/ipv4/tcp.c
> > > +++ b/net/ipv4/tcp.c
> > > @@ -1758,6 +1758,8 @@ static int tcp_zerocopy_receive(struct sock *sk,
> > > int inq;
> > > int ret;
> > >
> > > + address = untagged_addr(address);
> > > +
> > > if (address & (PAGE_SIZE - 1) || address != zc->address)
> >
> > The second test will fail, if the top bits are changed in address but not in zc->address
>
> Will fix in v12, thanks Eric!
Looking at the code, what's the point of this address != zc->address
check? Should I just remove it?
>
> >
> > > return -EINVAL;
> > >
> > >
> >
next prev parent reply other threads:[~2019-03-18 13:17 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-15 19:51 [PATCH v11 00/14] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 01/14] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 02/14] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 03/14] lib, arm64: untag user pointers in strn*_user Andrey Konovalov
2019-03-18 11:33 ` Kevin Brodsky
2019-03-15 19:51 ` [PATCH v11 04/14] mm, arm64: untag user pointers passed to memory syscalls Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 05/14] mm, arm64: untag user pointers in mm/gup.c Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 06/14] fs, arm64: untag user pointers in copy_mount_options Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 07/14] fs, arm64: untag user pointers in fs/userfaultfd.c Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 08/14] net, arm64: untag user pointers in tcp_zerocopy_receive Andrey Konovalov
2019-03-15 20:03 ` Eric Dumazet
2019-03-18 13:14 ` Andrey Konovalov
2019-03-18 13:16 ` Andrey Konovalov [this message]
2019-03-18 14:44 ` Eric Dumazet
2019-03-18 16:08 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 09/14] kernel, arm64: untag user pointers in prctl_set_mm* Andrey Konovalov
2019-03-16 19:31 ` kbuild test robot
2019-03-18 16:53 ` Andrey Konovalov
2019-03-18 11:47 ` Kevin Brodsky
2019-03-18 16:53 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 10/14] tracing, arm64: untag user pointers in seq_print_user_ip Andrey Konovalov
2019-03-15 20:14 ` Steven Rostedt
2019-03-18 13:11 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 11/14] uprobes, arm64: untag user pointers in find_active_uprobe Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 12/14] bpf, arm64: untag user pointers in stack_map_get_build_id_offset Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 13/14] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2019-03-18 13:26 ` Kevin Brodsky
2019-03-18 16:59 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 14/14] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2019-03-18 16:35 ` [PATCH v2 0/4] arm64 relaxed ABI Vincenzo Frascino
2019-03-18 16:35 ` [PATCH v2 1/4] elf: Make AT_FLAGS arch configurable Vincenzo Frascino
2019-03-18 16:35 ` [PATCH v2 2/4] arm64: Define Documentation/arm64/elf_at_flags.txt Vincenzo Frascino
2019-03-22 6:22 ` Amit Daniel Kachhap
2019-03-22 10:48 ` Catalin Marinas
2019-03-22 15:52 ` Kevin Brodsky
2019-04-03 16:50 ` Catalin Marinas
2019-04-12 14:16 ` Kevin Brodsky
2019-03-18 16:35 ` [PATCH v2 3/4] arm64: Relax Documentation/arm64/tagged-pointers.txt Vincenzo Frascino
2019-03-18 16:35 ` [PATCH v2 4/4] arm64: elf: Advertise relaxed ABI Vincenzo Frascino
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