From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Christoph Hellwig <hch@lst.de>
Cc: x86@kernel.org, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Masami Hiramatsu <mhiramat@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-parisc@vger.kernel.org, linux-um@lists.infradead.org,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
linux-mm@kvack.org, open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 13/23] bpf: rework the compat kernel probe handling
Date: Thu, 21 May 2020 15:10:42 -0700 [thread overview]
Message-ID: <CAEf4BzZCp3w9YB0Hg1yyfXFTTCv_Kvi2Xc5RXm7DU2kgm31EUg@mail.gmail.com> (raw)
In-Reply-To: <20200521152301.2587579-14-hch@lst.de>
On Thu, May 21, 2020 at 8:26 AM Christoph Hellwig <hch@lst.de> wrote:
>
> Instead of using the dangerous probe_kernel_read and strncpy_from_unsafe
> helpers, rework the compat probes to check if an address is a kernel or
> userspace one, and then use the low-level kernel or user probe helper
> shared by the proper kernel and user probe helpers. This slightly
> changes behavior as the compat probe on a user address doesn't check
> the lockdown flags, just as the pure user probes do.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
Looks good, thanks.
Acked-by: Andrii Nakryiko <andriin@fb.com>
> kernel/trace/bpf_trace.c | 109 ++++++++++++++++++++++++---------------
> 1 file changed, 67 insertions(+), 42 deletions(-)
>
[...]
next prev parent reply other threads:[~2020-05-21 22:10 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 15:22 clean up and streamline probe_kernel_* and friends v4 Christoph Hellwig
2020-05-21 15:22 ` [PATCH 01/23] maccess: unexport probe_kernel_write and probe_user_write Christoph Hellwig
2020-05-21 15:22 ` [PATCH 02/23] maccess: remove various unused weak aliases Christoph Hellwig
2020-05-21 15:22 ` [PATCH 03/23] maccess: remove duplicate kerneldoc comments Christoph Hellwig
2020-05-21 15:22 ` [PATCH 04/23] maccess: clarify " Christoph Hellwig
2020-05-21 15:22 ` [PATCH 05/23] maccess: update the top of file comment Christoph Hellwig
2020-05-21 15:22 ` [PATCH 06/23] maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault Christoph Hellwig
2020-05-21 15:22 ` [PATCH 07/23] maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault Christoph Hellwig
2020-05-21 15:22 ` [PATCH 08/23] maccess: rename strnlen_unsafe_user to strnlen_user_nofault Christoph Hellwig
2020-05-21 15:22 ` [PATCH 09/23] maccess: remove probe_read_common and probe_write_common Christoph Hellwig
2020-05-21 15:22 ` [PATCH 10/23] maccess: unify the probe kernel arch hooks Christoph Hellwig
2020-05-28 0:55 ` Andrew Morton
2020-05-21 15:22 ` [PATCH 11/23] bpf: factor out a bpf_trace_copy_string helper Christoph Hellwig
2020-05-21 22:10 ` Andrii Nakryiko
2020-05-21 15:22 ` [PATCH 12/23] bpf: handle the compat string in bpf_trace_copy_string better Christoph Hellwig
2020-05-21 22:10 ` Andrii Nakryiko
2020-05-28 2:04 ` Andrew Morton
2020-05-28 2:26 ` Yonghong Song
2020-05-28 4:39 ` Christoph Hellwig
2020-05-28 17:06 ` Yonghong Song
2020-05-21 15:22 ` [PATCH 13/23] bpf: rework the compat kernel probe handling Christoph Hellwig
2020-05-21 22:10 ` Andrii Nakryiko [this message]
2020-05-21 15:22 ` [PATCH 14/23] tracing/kprobes: handle mixed kernel/userspace probes better Christoph Hellwig
2020-05-22 0:04 ` Masami Hiramatsu
2020-05-21 15:22 ` [PATCH 15/23] maccess: remove strncpy_from_unsafe Christoph Hellwig
2020-05-21 15:22 ` [PATCH 16/23] maccess: always use strict semantics for probe_kernel_read Christoph Hellwig
2020-05-21 15:22 ` [PATCH 17/23] maccess: move user access routines together Christoph Hellwig
2020-05-21 15:22 ` [PATCH 18/23] maccess: allow architectures to provide kernel probing directly Christoph Hellwig
2020-05-21 15:22 ` [PATCH 19/23] x86: use non-set_fs based maccess routines Christoph Hellwig
2020-05-21 15:22 ` [PATCH 20/23] maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault Christoph Hellwig
2020-05-21 15:22 ` [PATCH 21/23] maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault Christoph Hellwig
2020-05-21 15:23 ` [PATCH 22/23] maccess: rename probe_kernel_address to get_kernel_nofault Christoph Hellwig
2020-05-21 15:23 ` [PATCH 23/23] maccess: return -ERANGE when copy_from_kernel_nofault_allowed fails Christoph Hellwig
2020-05-21 18:03 ` clean up and streamline probe_kernel_* and friends v4 Linus Torvalds
2020-05-22 0:22 ` Masami Hiramatsu
2020-05-25 22:19 ` Andrew Morton
2020-05-26 6:13 ` Christoph Hellwig
2020-05-28 0:36 ` Andrew Morton
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